Keyword: experiment
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MOPOJO07 Experimental Study to Optimize the Treatment Efficacy of Pharmaceutical Effluents by Combining Electron Beam Irradiation electron, radiation, simulation, electronics 38
 
  • P. Kumar, A.B. Kavar, M. Meena, P. Nama, A. Pathak, R. Varma
    IIT Mumbai, Mumbai, India
  • A.P. Deshpande, T.S. Dixit, R. Krishnan
    SAMEER, Mumbai, India
  
  Here, we report our first step towards tackling this issue at the roots by irradiating the pharmaceutical effluents from a stages of their existing treatment plant with an Electron Beam (EB) with doses varying from 25 kGy to 200 kGy. We have used a normal conducting pulsed wave linear accelerator developed by SAMEER. It produced a pencil beam of electrons of energy 6 MeV with an average current of 16 micro-Ampere. To ensure optimum dose delivery, Fluka-Flair Simulations have been used. We have successfully demonstrated that electron beam irradiation along with the use of conventional techniques like coagulation after the irradiation can further increase the efficacy of the process with a final reduction in Chemical Oxygen Demand (COD) to be as large as 65% in some of the cases.  
poster icon Poster MOPOJO07 [0.745 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOJO07  
About • Received ※ 17 August 2022 — Revised ※ 21 August 2022 — Accepted ※ 26 August 2022 — Issue date ※ 01 September 2022
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MOPOPA02 Identification of the Mechanical Dynamics of the Superconducting Radio-Frequency Cavities for the European XFEL CW Upgrade cavity, controls, FEL, SRF 76
 
  • W.H. Syed, A. Bellandi, J. Branlard, A. Eichler
    DESY, Hamburg, Germany
  
  The European X-Ray Free-Electron Laser (EuXFEL) is to-date the largest X-ray research facility around the world which spans over 3.4 km. EuXFEL is currently being operated in a pulsed mode with a repetition rate of 10Hz. One upgrade scenario consists of operating the EuXFEL also in a Continuous-Wave (CW) mode of operation to improve the quality of experiments. This upgrade brings new challenges and requires new algorithms to deal with controlling a stable accelerating field inside the Superconducting Radiofrequency (SRF) accelerating cavities and keeping them on resonance in this new mode of operation. The purpose of this research work is to identify the mechanical dynamics of the cavities which will facilitate the development of the resonance controller for the CW upgrade. To this extent, experiments were conducted at a test bench. For the first time, in this work, two different types of spectrally rich excitation signals: multi-sine and stepped-sine are used to excite the mechanical dynamics of the cavities using the piezo actuator. After the analysis of experimental data, mechanical modes are successfully identified and will be used to design the controller.  
poster icon Poster MOPOPA02 [0.687 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA02  
About • Received ※ 23 August 2022 — Revised ※ 25 August 2022 — Accepted ※ 26 August 2022 — Issue date ※ 01 September 2022
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MOPOPA04 Simulation Study of an Accelerator-based THz FEL for Pump-Probe Experiments at the European XFEL FEL, simulation, undulator, electron 83
 
  • P. Boonpornprasert, G.Z. Georgiev, M. Krasilnikov, X.-K. Li, A. Lueangaramwong
    DESY Zeuthen, Zeuthen, Germany
  
  The European XFEL considers to perform THz-pump and X-ray-probe experiments. A promising concept to provide the THz pulses with satisfactory properties for the experiments is to generate them using a linear accelerator-based free-electron laser (FEL). A simulation study of a THz FEL facility capable of generating powerful tunable coherent THz radiation that covers the wavelength range of 25 ’m to 100 ’m was performed. An accelerator beamline layout based on the Photo Injector Test Facility at DESY in Zeuthen (PITZ) and an APPLE-II undulator with a period length of 40 mm were used in the simulation study. Results of the study are presented and discussed in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA04  
About • Received ※ 25 August 2022 — Revised ※ 27 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 05 September 2022
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MOPOPA21 RF Beam Sweeper for Purifying In-Flight Produced Rare Isotope Beams at ATLAS Facility high-voltage, operation, simulation, controls 122
 
  • S.V. Kutsaev, R.B. Agustsson, A.C. Araujo Martinez, J. Peña González, A.Yu. Smirnov
    RadiaBeam, Santa Monica, California, USA
  • B. Mustapha
    ANL, Lemont, Illinois, USA
  
  Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under SBIR grant DE-SC0019719.
RadiaBeam is developing an RF beam sweeper for puri-fying in-flight produced rare isotope beams at the ATLAS facility of Argonne National Laboratory. The device will operate in two frequency regimes ’ 6 MHz and 12 MHz ’ each providing a 150 kV deflecting voltage, which dou-bles the capabilities of the existing ATLAS sweeper. In this paper, we present the design of a high-voltage RF sweeper and discuss the electromagnetic, beam dynamics, and solid-state power source for this device. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA21  
About • Received ※ 14 August 2022 — Revised ※ 19 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 01 September 2022
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MOPOGE02 Status of the TOP-IMPLART Proton Linac linac, proton, MMI, radiation 138
 
  • P. Nenzi, A. Ampollini, G. Bazzano, F. Fortini, L. Picardi, C. Ronsivalle, V. Surrenti, E. Trinca
    ENEA C.R. Frascati, Frascati (Roma), Italy
  • M.D. Astorino
    ENEA, Agenzia nazionale per le nuove tecnologie, l’energia e lo sviluppo economico sostenibile, Frascati, Italy
  
  The TOP-IMPLART (Intensity Modulated Proton Linear Accelerator for Radio Therapy) proton linac, is a RF pulsed linac, designed for protontherapy consisting of a low frequency (425 MHz) 7 MeV injector followed by a sequence of accelerating modules operating at 3 GHz under construction, assembly and test at the ENEA Frascati Research Center. The accelerator features also a vertical low energy (3-7 MeV) line for irradiation of samples in horizontal position. The segment currently completed includes 8 SCDTL modules up to 71 MeV grouped in two sections each one powered by a 10 MW klystron driven by a SCANDINOVA K100 modulator with a variable pulse length (1-5 us) at a repetition frequency of 25 Hz. The output current can be varied up to 30 uA. The beam is mainly used for radiobiology experiments and dosimetry systems tests, but the flexibility in beam characteristics makes it suitable also for applications different from protontherapy, as the irradiation of electronics components to verify their behavior in the space environment. In this work, the current status of the accelerator and beam characteristics measurements are presented with an overview of the experiments carried on it.  
poster icon Poster MOPOGE02 [7.021 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE02  
About • Received ※ 13 August 2022 — Revised ※ 27 August 2022 — Accepted ※ 02 September 2022 — Issue date ※ 12 September 2022
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MOPOGE11 Update on the First 3D Printed IH-Type Linac Structure - Proof-of-Concept for Additive Manufacturing of Linac RF Cavities cavity, vacuum, linac, simulation 170
 
  • H. Hähnel, A. Ateş, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  
  Funding: This research was funded by BBMBF grant number 05P21RFRB2.
Additive manufacturing ("AM" or "3D printing") has become a powerful tool for rapid prototyping and manufacturing of complex geometries. A 433 MHz IH-DTL cavity has been constructed to act as a proof of concept for additive manufacturing of linac components. In this case, the internal drift tube structure has been produced from 1.4404 stainless steel using AM. We present the concept of the cavity as well as first results of vacuum testing, materials testing and low level rf measurements. Vacuum levels sufficient for linac operation have been reached with the AM linac structure. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE11  
About • Received ※ 22 August 2022 — Accepted ※ 28 August 2022 — Issue date ※ 02 September 2022  
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MOPORI03 Development of Quantum Gas Jet Beam Profile Monitor for Sub-mm Beams electron, space-charge, focusing, factory 223
 
  • N. Kumar, O. Stringer, C.P. Welsch, J. Wolfenden, H.D. Zhang
    The University of Liverpool, Liverpool, United Kingdom
  • N. Kumar, C.P. Welsch, J. Wolfenden, H.D. Zhang
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • I. Maltusch
    FH Aachen, Jülich, Germany
  
  Funding: This work is supported by the STFC grants ST/W000687/1 and ST/W002159/1, InnovateUK Germinator 10004615, HL-LHC-UK project funded by STFC and CERN and the STFC Cockcroft core grant No. ST/G008248/1.
The development work of a high-resolution quantum gas jet beam profile monitor for highly energetic sub-mm particle beams is in progress at the Cockcroft Institute (CI), UK. This device is designed on the principle of detecting the secondary ions from the ionisation induced in the interaction between the quantum gas jet and charged particle beams. This monitor aims to generate an intense gas jet with a diameter of less than 100 µm, which can ultimately lead to superior position resolution and high signal intensity resulting from a strongly focused quantum gas jet. This is done by exploiting the quantum wave feature of the neutral gas atoms to generate an interference pattern with a single maximum acting as an ultra-thin gas jet using an ’atom sieve’ which is similar to the light focusing with a Fresnel zone plate. This device will be minimally interceptive and will work analogously to a mechanical wire scanner. This contribution gives a general overview of the design, working principle of the monitor and experimental results obtained from the electron beam profile measurements carried out at the Cockcroft Institute. 		 
poster icon Poster MOPORI03 [1.581 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPORI03  
About • Received ※ 13 August 2022 — Revised ※ 16 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 01 September 2022
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MOPORI04 A Gas Jet Beam Halo Monitor for LINACs simulation, electron, extraction, background 227
 
  • O. Stringer, N. Kumar, C.P. Welsch, H.D. Zhang
    The University of Liverpool, Liverpool, United Kingdom
  • N. Kumar, O. Stringer, C.P. Welsch, H.D. Zhang
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  
  The gas jet beam profile monitor is a non-invasive beam monitor that is currently being commissioned at the Cockcroft Institute. It utilises a supersonic gas curtain which traverses the beam perpendicular to its propagation and measures beam-induced ionisation interactions of the gas. A 2D transverse beam profile image is created by orientating the gas jet 45 degrees to obtain both X and Y distributions of the beam. This paper builds upon previously used single-slit skimmers and improves their ability to form the gas jet into a desired distribution for imaging beam halo. A skimmer device removes off-momentum gas particles and forms the jet into a dense thin curtain, suitable for transverse imaging of the beam. The use of a novel double-slit skimmer is shown to provide a mask-like void of gas over the beam core, increasing the relative intensity of the halo interactions for measurement. Such a non-invasive monitor would be beneficial to linacs by providing real time beam characteristic measurements without affecting the beam. More specifically, beam halo behaviour is a key characteristic associated with beam losses within linacs.  
poster icon Poster MOPORI04 [1.066 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPORI04  
About • Received ※ 24 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 13 October 2022
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MOPORI06 Improvements on the Modified Nomarski Interferometer for Measurements of Supersonic Gas Jet Density Profiles laser, vacuum, focusing, diagnostics 235
 
  • C. Swain, O. Apsimon, A. Salehilashkajani, C.P. Welsch, J. Wolfenden, H.D. Zhang
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • Ö. Apsimon, A. Salehilashkajani, C. Swain, C.P. Welsch, J. Wolfenden, H.D. Zhang
    The University of Liverpool, Liverpool, United Kingdom
  
  Funding: This work is supported by the AWAKE-UK phase II project funded by STFC, the STFC Cockcroft core grant No. ST/G008248/1 and the HL-LHC-UK phase II project funded by STFC under Grant Ref: ST/T001925/1.
For supersonic gas jet based beam profile monitors such as that developed for the High Luminosity Large Hadron Collider (HL-LHC) upgrade, density profile is a key characteristic. Due to this, non-invasive diagnostics to study the jet’s behaviour have been designed. A Nomarski interferometer was constructed to image jets 30 um to 1 mm in diameter and study changes in their density. A microscope lens has been integrated into the original interferometer system to capture phase changes on a much smaller scale than previous experiments have achieved. This contribution presents the optimisation and results gained from this interferometer. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPORI06  
About • Received ※ 14 August 2022 — Revised ※ 24 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 01 September 2022
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MOPORI10 First Studies of 5D Phase-Space Tomography of Electron Beams at ARES electron, simulation, emittance, quadrupole 247
 
  • S. Jaster-Merz, R.W. Aßmann, R. Brinkmann, F. Burkart, T. Vinatier
    DESY, Hamburg, Germany
  • R.W. Aßmann
    LNF-INFN, Frascati, Italy
  
  A new beam diagnostics method to reconstruct the full 5-dimensional phase space (x, x’, y, y’, t) of bunches has recently been proposed. This method combines a quadrupole-based transverse phase-space tomography with the variable streaking angle of a polarizable X-band transverse deflecting structure (PolariX TDS). Two of these novel structures have recently been installed at the ARES beamline at DESY, which is a linear accelerator dedicated to accelerator research and development, including advanced diagnostics methods and novel accelerating techniques. In this paper, realistic simulation studies in preparation for planned experimental measurements are presented using the beamline setup at ARES. The reconstruction quality of the method for three beam distributions is studied and discussed, and it is shown how this method will allow the visualization of detailed features in the phase-space distribution.  
slides icon Slides MOPORI10 [0.808 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPORI10  
About • Received ※ 22 August 2022 — Revised ※ 27 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 09 September 2022
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MOPORI11 Seismic Analysis for Safety Requirements of SPIRAL2 Accelerator detector, simulation, linac, vacuum 252
 
  • C. Barthe-Dejean, F. Lutton, M. Michel
    GANIL, Caen, France
  
  The SPIRAL2 Accelerator at GANIL is a superconducting ion continuous wave LINAC with two associated experimental areas. Mechanical engineers have been highly involved in the design of SPIRAL2 equipments since the beginning of the project in 2004. During the development phase, Computer Aided Design and calculation codes have been used throughout the complete process : from the ion sources, the LINAC, the beam transport lines and the experimental halls equipped with detectors. SPIRAL2 has to meet different safety requirements, among which seismic hazard. This involves justifying that the integrity of the radiologic containment barrier is always maintained in case of earthquake. This paper reports the improvement in design and calculation methods performed by GANIL engineers to meet the seismic safety requirements, specificly the non-missility feature of the equpiment. The modal-spectral simulations, used to demonstrate the mechanical strength of equipments in case of earthquakes, was an important part of this design activity in the past 10 years New methods have been used to calculate welds, fasteners and the ground anchor of the structural supports of the heaviest equipments.
C. Barthe-Dejean, F. Lutton, « Guide methodologique pour Calculs de Tenue aux Séismes des équipements mécaniques », Note STP-535-A 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPORI11  
About • Received ※ 14 August 2022 — Revised ※ 19 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 02 September 2022
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MOPORI22 High-Power Test of an APF IH-DTL Prototype for the Muon Linac cavity, linac, DTL, simulation 275
 
  • Y. Nakazawa, H. Iinuma
    Ibaraki University, Ibaraki, Japan
  • E. Cicek, H. Ego, K. Futatsukawa, N. Kawamura, T. Mibe, S. Mizobata, N. Saito, M. Yoshida
    KEK, Ibaraki, Japan
  • N. Hayashizaki
    Research Laboratory for Nuclear Research, Tokyo Institute of Technology, Tokyo, Japan
  • Y. Iwata
    NIRS, Chiba-shi, Japan
  • R. Kitamura, Y. Kondo, T. Morishita
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • M. Otani
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  • Y. Sue, K. Sumi, M. Yotsuzuka
    Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan
  • Y. Takeuchi
    Kyushu University, Fukuoka, Japan
  • T. Yamazaki
    KEK, Tokai Branch, Tokai, Naka, Ibaraki, Japan
  • H.Y. Yasuda
    University of Tokyo, Tokyo, Japan
  
  A muon linac is under development for a new muon g-2/EDM experiment at J-PARC. The muons are cooled to about room temperature and then re-accelerated to 212 MeV by four linear accelerators to produce a low-emittance muon beam. In the low-beta section, a short-range acceleration cavity with high efficiency needs to be developed to suppress the decay of muons. We propose a 324 MHz inter-digital H-mode drift-tube linac (IH-DTL) with high acceleration efficiency. The cavity can be downsized by introducing the alternating phase focusing (APF) method that provides transverse focusing only with an E-field. We have developed a prototype cavity that accelerates muons up to 1.3 MeV to demonstrate the principle. In this paper, the result of the high power test of the APF IH-DTL prototype is reported.  
poster icon Poster MOPORI22 [10.978 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPORI22  
About • Received ※ 13 August 2022 — Revised ※ 16 August 2022 — Accepted ※ 28 August 2022 — Issue date ※ 01 September 2022
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TUPOJO22 Progress of PIP-II Activities at IJCLab cavity, HOM, SRF, niobium 402
 
  • P. Duchesne, N. Gandolfo, D. Le Dréan, D. Longuevergne, R. Martret, T. Pépin-Donat, F. Rabehasy, S. Roset, L.M. Vogt
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  • P. Berrutti, M. Parise, D. Passarelli
    Fermilab, Batavia, Illinois, USA
  
  Since 2018, IJCLab is involved in PIP-II project on the design and development of accelerator components for the SSR2 (Single Spoke Resonator type 2) section of the superconducting linac. First pre-production components have been fabricated, surface processing and cavity qualification in vertical cryostat are on-going. IJCLab has upgraded its facilities by developing a new set-up to perform rotational BCP. The progress of all processing and testing activities for PIP-II project will be reported and, in particular, a dedicated study to qualify removal uniformity compared to static BCP will be presented.  
poster icon Poster TUPOJO22 [1.997 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO22  
About • Received ※ 23 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 01 September 2022
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TUPOPA06 Microscopy Investigation on Different Materials After Pulsed High Field Conditioning and Low Energy H-Irradiation radiation, electron, detector, cathode 422
 
  • C.F. Da Palma Serafim, G. Bellodi, S. Calatroni, A. Grudiev, A.M. Lombardi, R.C. Peacock, A.T. Perez Fontenla, S. Ramberger, E. Sargsyan, S. Sgobba, W. Wuensch
    CERN, Meyrin, Switzerland
  • F. Djurabekova
    HIP, University of Helsinki, Finland
  
  During operation the LINAC4 RFQ (Radio-Frequency-Quadrupole) is exposed to high electric fields which can lead to vacuum breakdown. It is also subject to beam loss that can cause surface modification, including blistering, which can result in reduced electric field handling and an increased breakdown rate. An experimental study has been made to identify materials with high electric field capability and robustness to low-energy irradiation. In this paper we briefly discuss the selection criteria and we analyze these materials investigating their metallurgical properties using advanced microscopic techniques such as Scanning Electron Microscope, Electron Back Scattered Diffraction, Energy-dispersive X-ray Spectroscopy and conventional optical microscopy. These allow to observe and characterize the different materials on aμand a nano-scale, allowing us to compare results before and after irradiation and breakdown testing.  
poster icon Poster TUPOPA06 [2.771 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOPA06  
About • Received ※ 14 August 2022 — Revised ※ 23 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 31 August 2022
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TUPOPA15 Multipactor Studies: Simulations and Measurements on the RF Coaxial Resonator Test Bench multipactoring, electron, simulation, cavity 445
 
  • Y. Gómez Martínez, J. Angot, M.A. Baylac, T. Cabanel, M. Meyer
    LPSC, Grenoble Cedex, France
  • D. Longuevergne, G. Sattonnay
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  
  Multipactor is an undesired phenomenon triggered by electromagnetic fields in accelerator components and more specifically in RF structures, such as accelerating cavities and power couplers, and may lead to Electron Cloud build up in beam tubes. The accelerator group at LPSC has developed an experimental setup dedicated to multipactor studies. It consists in a coaxial resonator, tunable and operational between 100 MHz and 1 GHz. It allows to characterize under real conditions the efficiency of surface treatment mitigation processes (coatings, cleaning procedures) at room temperature. This paper presents the experimental measurements performed with this setup confronted to simulations.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOPA15  
About • Received ※ 12 August 2022 — Revised ※ 30 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 16 September 2022
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TUPOGE18 Operations of Copper Cavities at Cryogenic Temperatures cavity, cryogenics, vacuum, coupling 533
 
  • H. Wang, U. Ratzinger, M. Schuett
    IAP, Frankfurt am Main, Germany
  
  This work is focused on the anomalous skin effect in copper and how it affects the efficiency of copper-cavities in the temperature range 40-50 K. The quality factor Q of three coaxial cavities was measured over the temperature range from 10 K to room temperature in the experiment. The three coaxial cavities have the same structure, but different lengths, which correspond to resonant frequencies: around 100 MHz, 220 MHz and 340 MHz. Furthermore, the effects of copper-plating and additional baking in the vacuum oven on the quality factor Q are studied in the experiment. The motivation is to check the feasibility of an efficient, pulsed, ion linac, operated at cryogenic temperatures.  
slides icon Slides TUPOGE18 [1.115 MB]  
poster icon Poster TUPOGE18 [1.518 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE18  
About • Received ※ 22 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 02 September 2022 — Issue date ※ 03 September 2022
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TUPORI08 End-to-End Simulations and Error Studies of the J-PARC Muon Linac linac, emittance, acceleration, simulation 562
 
  • Y. Takeuchi, J. Tojo, T. Yamanaka
    Kyushu University, Fukuoka, Japan
  • E. Cicek, H. Ego, K. Futatsukawa, N. Kawamura, T. Mibe, M. Otani, N. Saito, T. Yamazaki
    KEK, Ibaraki, Japan
  • H. Iinuma, Y. Nakazawa
    Ibaraki University, Ibaraki, Japan
  • Y. Iwashita
    Kyoto University, Research Reactor Institute, Osaka, Japan
  • R. Kitamura, Y. Kondo, T. Morishita
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • Y. Sato
    Niigata University, Niigata, Japan
  • Y. Sue, K. Sumi, M. Yotsuzuka
    Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan
  • H.Y. Yasuda
    University of Tokyo, Tokyo, Japan
  
  A muon linac is under development for future muon ’’’ 2/EDM experiments at J-PARC. The linac provides a 212 MeV muon beam to an MRI-type compact storage ring. Af- ter the initial acceleration using the electrostatic field created by mesh and cylindrical electrodes, the muons are acceler- ated using four types of radio-frequency accelerators. To validate the linac design as a whole, end-to-end simulations were performed using General Particle Tracer. In addition, error studies is ongoing to investigate the effects on beam and spin dynamics of various errors in the accelerator com- ponents and input beam distribution. This paper describes the preliminary results of the end-to-end simulations and error studies.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI08  
About • Received ※ 24 August 2022 — Revised ※ 25 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 12 October 2022
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TUPORI18 The Design of the Full Energy Beam Exploitation (FEBE) Beamline on CLARA laser, electron, diagnostics, FEL 585
 
  • D. Angal-Kalinin, A.R. Bainbridge, J.K. Jones, T.H. Pacey, Y.M. Saveliev, E.W. Snedden
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  
  The CLARA facility at Daresbury Laboratory was orig-inally designed for the study of novel FEL physics utilis-ing high-quality electron bunches at up to 250 MeV/c. To maximise the exploitation of the accelerator complex, a dedicated full energy beam exploitation (FEBE) beam-line has been designed and is currently being installed in a separate vault on the CLARA accelerator. FEBE will allow the use of high charge (up to 250 pC), moderate energy (up to 250 MeV), electron bunches for a wide variety of accelerator applications critical to ongoing accelerator development in the UK and international communities. The facility consists of a shielded enclo-sure, accessible during beam running in CLARA, with two very large experimental chambers compatible with a wide range of experimental proposals. High-power laser beams (up to 100 TW) will be available for electron-beam interactions in the first chamber, and there are concrete plans for a wide variety of advanced diagnostics (includ-ing a high-field permanent magnet spectrometer and dielectric longitudinal streaker), essential for multiple experimental paradigms, in the second chamber. FEBE will be commissioned in 2024.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI18  
About • Received ※ 19 August 2022 — Revised ※ 23 August 2022 — Accepted ※ 28 August 2022 — Issue date ※ 15 September 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WE1AA02 Run 2 of the Advanced Plasma Wakefield Experiment (AWAKE) at CERN electron, plasma, proton, wakefield 625
 
  • G. Zevi Della Porta
    CERN, Meyrin, Switzerland
  
  After successful completion of Run 1 of the Advanced Plasma Wakefield Experiment (AWAKE) at CERN, the experiment started Run 2 in 2021. The goals of AWAKE Run 2 are to accelerate electrons in proton-beam-driven plasma wakefields to high energies with gradients of up to 1 GV/m while preserving the electron beam normalized emittance at the 10 um level, and to demonstrate the acceleration of electrons in scalable plasma sources to 50-100 GeV. The first milestone towards these final goals is to demonstrate electron seeding of the self-modulation of the entire proton bunch. This was achieved in the 2021 run and some highlight results are shown. In the next phases of AWAKE Run 2, a new X-band electron source will provide a 150 MeV, 200 fs, 100 pC electron beam, to be accelerated in the plasma wakefields.  
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slides icon Slides WE1AA02 [23.386 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-WE1AA02  
About • Received ※ 22 August 2022 — Revised ※ 30 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 16 September 2022
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WE1AA03 FACET-II plasma, electron, laser, diagnostics 631
 
  • C.I. Clarke, J.M. Allen, L.E. Alsberg, A.L. Edelen, H.E. Ekerfelt, C. Emma, E. Gerstmayr, S.J. Gessner, C. Hast, M.J. Hogan, M.D. Litos, R. Loney, S. Meuren, S.A. Miskovich, B.D. O’Shea, M. Parker, D.A. Reis, D.W. Storey, R. Watt, G. Yocky
    SLAC, Menlo Park, California, USA
  • R. Ariniello, C.E. Doss, V. Lee
    CIPS, Boulder, Colorado, USA
  • G.J. Cao
    University of Oslo, Oslo, Norway
  • S. Corde, A. Knetsch, P. San Miguel Claveria
    LOA, Palaiseau, France
  • C.E. Hansel
    Colorado University at Boulder, Boulder, Colorado, USA
  • C. Joshi, K.A. Marsh, Z. Nie, C. Zhang
    UCLA, Los Angeles, California, USA
  • J. Wang
    UNL, Lincoln, Nebraska, USA
  
  Funding: This work performed under DOE Contract DE-AC02-76SF00515 and also supported under FES Award DE-SC0020076.
FACET-II is a National User Facility at SLAC National Accelerator Laboratory providing 10 GeV electron beams with um-rad normalised emittance and peak currents exceeding 100 kA . FACET-II operates as a National User Facility while engaging a broad User community to develop and execute experimental proposals that advance the development of plasma wakefield accelerators. FACET-II is currently commissioned and has started with first experiments. The special features of FACET-II will be shown and first results from the experiments. 		 
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slides icon Slides WE1AA03 [6.471 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-WE1AA03  
About • Received ※ 20 August 2022 — Revised ※ 23 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 04 September 2022
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WE1AA05 The Muon Linac Project at J-PARC linac, rfq, DTL, acceleration 636
 
  • Y. Kondo, Y. Fuwa, R. Kitamura, K. Moriya, T. Takayanagi
    JAEA/J-PARC, Tokai-mura, Japan
  • S. Bae, H. Choi, S. Choi, B. Kim, H.S. Ko
    SNU, Seoul, Republic of Korea
  • E. Cicek, H. Ego, Y. Fukao, K. Futatsukawa, N. Kawamura, T. Mibe, Y. Miyake, S. Mizobata, M. Otani, N. Saito, K. Shimomura, T. Yamazaki, M. Yoshida
    KEK, Ibaraki, Japan
  • K. Hasegawa
    QST Rokkasho, Aomori, Japan
  • N. Hayashizaki
    Research Laboratory for Nuclear Research, Tokyo Institute of Technology, Tokyo, Japan
  • T. Iijima, Y. Sue, K. Sumi
    Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan
  • H. Iinuma, Y. Nakazawa
    Ibaraki University, Ibaraki, Japan
  • K. Inami, K. Suzuki, M. Yotsuzuka
    Nagoya University, Nagoya, Japan
  • K. Ishida
    RIKEN Nishina Center, Wako, Japan
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  • T. Morishita
    JAEA/LINAC, Ibaraki-ken, Japan
  • G.P. Razuvaev
    Budker INP & NSU, Novosibirsk, Russia
  • Y. Takeuchi, J. Tojo
    Kyushu University, Fukuoka, Japan
  • E. Won
    Korea University, Seoul, Republic of Korea
  • H.Y. Yasuda
    University of Tokyo, Tokyo, Japan
  
  The muon linac project for the precise measurement of the muon anomalous magnetic and electric dipole moments, which is currently one of the hottest issues of the elementary particle physics, is in progress at J-PARC. The muons from the J-PARC muon facility are once cooled to room temperature, then accelerated up to 212 MeV with a normalized emittance of 1.5 pi mm mrad and a momentum spread of 0.1%. Four types of accelerating structures are adopted to obtain the efficient acceleration with a wide beta range from 0.01 to 0.94. The project is moving into the construction phase. They already demonstrated the re-acceleration scheme of the decelerated muons using a 324-MHz RFQ in 2017. The high-power test of the 324-MHz Interdigital H-mode (IH) DTL using a prototype cavity will be performed in 2021. The fabrication of the first module of 14 modules of the 1296-MHz Disk and Washer (DAW) CCL will be done to confirm the production process. Moreover, the final design of the travelling wave accelerating structure for the high beta region is also proceeding. In this presentation, the recent progress toward the realization of the world first muon linac will be presented.  
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slides icon Slides WE1AA05 [3.764 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-WE1AA05  
About • Received ※ 14 August 2022 — Revised ※ 21 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 16 September 2022
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WE2AA04 Data Analysis and Control of an MeV Ultrafast Electron Diffraction System using Machine Learning electron, network, real-time, FEM 650
 
  • T.B. Bolin, S. Biedron, M.A. Fazio, M. Martínez-Ramón, S.I. Sosa Guitron
    UNM-ECE, Albuquerque, USA
  • M. Babzien, M.G. Fedurin, J.J. Li, M.A. Palmer
    BNL, Upton, New York, USA
  • S. Biedron
    Element Aero, Chicago, USA
  • S. Biedron
    UNM-ME, Albuquerque, New Mexico, USA
  
  MeV ultrafast electron diffraction (MUED) is a pump-probe material characterization technique to study ultrafast lattice dynamics with high temporal and spatial resolution. It is a relatively young technology that has the potential to shed light onto some of the most puzzling problems in physics. This complex instrument can be advanced into a turn-key high-throughput tool with the aid of machine learning (ML) mechanisms together with high-performance computing. The MUED instrument located in the Accelerator Test Facility of Brookhaven National Laboratory was employed in this work to test different ML approaches for both data analysis and control. We characterized three materials using MUED: graphite, black phosphorous and gold thin films. Diffraction patterns were acquired in single shot mode and different ML methodologies were applied to reduce image noise. Convolutional neural network autoenconder and variational autoenconder models were utilized to extract the noise features and increase the signal-to-noise ratio. The energy jitter of the electron beam was analyzed after noise reduction of the single shot diffraction patterns.  
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slides icon Slides WE2AA04 [12.865 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-WE2AA04  
About • Received ※ 30 August 2022 — Revised ※ 02 September 2022 — Accepted ※ 15 September 2022 — Issue date ※ 20 September 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TH1AA05 R&D of Liquid Lithium Stripper at FRIB vacuum, heavy-ion, controls, operation 668
 
  • T. Kanemura, N.K. Bultman, R. Madendorp, F. Marti, T. Maruta, Y. Momozaki, J.A. Nolen, P.N. Ostroumov, A.S. Plastun, J. Wei, Q. Zhao
    FRIB, East Lansing, Michigan, USA
  • D.B. Chojnowski, Y. Momozaki, J.A. Nolen, C.B. Reed, J.R. Specht
    ANL, Lemont, Illinois, USA
  • M.J. LaVere
    MSU, East Lansing, Michigan, USA
  
  Funding: The U.S. Department of Energy, Office of Science, Office of Nuclear Physics. The Facility for Rare Isotope Beams (FRIB) is a DOE Office of Science User Facility under Award Number DE-SC0000661
Charge stripping is one of the most important processes in the acceleration of intense heavy ion beams, and the charge stripper greatly affects the performance of the accelerator facility. In this talk, the design method and the achieved performance of the liquid lithium stripper recently developed for FRIB will be reported. 		 
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slides icon Slides TH1AA05 [1.663 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TH1AA05  
About • Received ※ 10 August 2022 — Revised ※ 20 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 16 September 2022
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THPOJO01 The ARES Linac at DESY electron, linac, acceleration, diagnostics 691
 
  • F. Burkart, R.W. Aßmann, H. Dinter, S. Jaster-Merz, W. Kuropka, F. Mayet, T. Vinatier
    DESY, Hamburg, Germany
  
  The generation and acceleration of ultra-short, high quality electron beams has attracted more and more interest in accelerator science. Electron bunches with these properties are necessary to operate and test novel diagnostics and advanced high gradient accelerating schemes. Furthermore, several medical and industrial applications require high-brightness electron beams. The dedicated R&D linac ARES at DESY (Deutsches Elektronen-Synchrotron) is now fully operational and able to produce these electron beams at the nominal energy of 155 MeV and deliver it to users. This paper gives an overview of the ARES linac and summarizes the beam parameter measurements. The possibilities for user operation will be described in detail.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOJO01  
About • Received ※ 23 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 06 September 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPOJO09 Status of CLARA at Daresbury Laboratory gun, MMI, laser, linac 711
 
  • D. Angal-Kalinin, A.R. Bainbridge, A.D. Brynes, R.K. Buckley, S.R. Buckley, H.M. Castañeda Cortés, J.A. Clarke, L.S. Cowie, K.D. Dumbell, D.J. Dunning, A.J. Gilfellon, A.R. Goulden, J. Henderson, S. Hitchen, F. Jackson, C.R. Jenkins, M.A. Johnson, J.K. Jones, N.Y. Joshi, M.P. King, S.L. Mathisen, J.W. McKenzie, R. Mclean, K.J. Middleman, B.L. Militsyn, K.T. Morrow, A.J. Moss, B.D. Muratori, T.C.Q. Noakes, W.A. Okell, H.L. Owen, T.H. Pacey, A.E. Pollard, M.D. Roper, Y.M. Saveliev, D.J. Scott, B.J.A. Shepherd, R.J. Smith, E.W. Snedden, N. Thompson, C. Tollervey, R. Valizadeh, D.A. Walsh, A.E. Wheelhouse, P.H. Williams
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • A.R. Bainbridge, A.D. Brynes, J.A. Clarke, L.S. Cowie, K.D. Dumbell, D.J. Dunning, C.R. Jenkins, K.J. Middleman, A.J. Moss, B.D. Muratori, H.L. Owen, Y.M. Saveliev, D.J. Scott, B.J.A. Shepherd, N. Thompson, R. Valizadeh, A.J. Vick, A.E. Wheelhouse
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • A.D. Brynes
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • R.J. Cash, R.F. Clarke, M. Colling, G. Cox, B.D. Fell, S.A. Griffiths, M.D. Hancock, T. Hartnett, J.P. Hindley, C. Hodgkinson, G. Marshall, A. Oates, A.J. Vick, J.T.G. Wilson
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • J. Henderson
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  
  CLARA (Compact Linear Accelerator for Research and Applications) is a test facility for Free Electron Laser (FEL) research and other applications at STFC’s Daresbury Laboratory. The Front End of CLARA has been used for user exploitation programme from 2018. The second exploitation period in 2021-22 provided a range of beam parameters to 8 user experiments. We report on the status, further machine development, and future plans for CLARA including Full Energy Beam Exploitation (FEBE) beamline which will provide 250 MeV/c high brightness beam for novel experiments.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOJO09  
About • Received ※ 19 August 2022 — Revised ※ 28 August 2022 — Accepted ※ 05 September 2022 — Issue date ※ 15 September 2022
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THPOJO22 A Ground Experimental Approach Toward Understanding Mysterious Astrophysical Fast Radio Bursts plasma, electron, FEL, status 735
 
  • Y. Sumitomo, T. Asai, D. Kobayashi, S. Kumagai, K. Kusaka, Y. Onishi, T. Seki, R. Yanagi
    Nihon University, Tokyo, Japan
  • Y. Hayakawa, T. Sakai
    LEBRA, Funabashi, Japan
  • S. Kisaka
    HU ADSE, Hiroshima, Japan
  • H. Koguchi
    AIST, Tsukuba, Japan
  
  Funding: Nihon University CST Project Research Grant (2021 Apr. ~), Japan Society for the Promotion of Science (JSPS), Grant-in-Aid for Scientific Research (KAKENHI), Grant Number JP19K12631
The Fast Radio Bursts are astrophysical events that get much more attentions increasing year by year, due to their mysterious properties of signals. The major properties of signals include a class of the brightest astrophysical events, short durations of emissions, and larger dispersion measures than the known short duration events. Interestingly, the large values of dispersion measures suggest the existence of abundant plasma around the parent bodies of emissions. To have a better understanding of basic mechanism of the Fast Radio Burst emissions, we initiated a ground-based research project at our 100 MeV electron LINAC facility, in combination with the high-beta plasma generation knowledge matured also at Nihon University, that mimics plasma fields in space. In this presentation, we overview our project and report on the status of the experiment for the induced enhanced emissions from integrated iterative interactions with plasma fields. 		 
slides icon Slides THPOJO22 [0.678 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOJO22  
About • Received ※ 12 August 2022 — Revised ※ 21 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 23 September 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPOPA05 Status of the CLEAR User Facility at CERN and its Experiments electron, radiation, plasma, focusing 753
 
  • R. Corsini, W. Farabolini, A. Malyzhenkov, V. Rieker
    CERN, Meyrin, Switzerland
  • P. Korysko
    Oxford University, Physics Department, Oxford, Oxon, United Kingdom
  • K.N. Sjobak
    University of Oslo, Oslo, Norway
  
  The CERN Linear Accelerator for Research (CLEAR) at CERN is a versatile user facility providing a 200 MeV electron beam for accelerator R&D, irradiation studies for space, and medical applications. After successful operation in 2017-2020, CLEAR running was extended in 2021 for another 5-year period. In the paper we give a status of the facility, outlining recent progress in beam performance and hardware improvements. We report on beam operation over the last years and review the main results of experimental activities. Finally, we discuss the planned upgrades together with the proposed future experimental program.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOPA05  
About • Received ※ 24 August 2022 — Revised ※ 28 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 01 September 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPOPA06 Methods for VHEE/FLASH Radiotherapy Studies and High Dose Rate Dosimetry at the CLEAR User Facility electron, radiation, focusing, site 758
 
  • P. Korysko
    Oxford University, Physics Department, Oxford, Oxon, United Kingdom
  • J.J. Bateman, C.S. Robertson
    JAI, Oxford, United Kingdom
  • R. Corsini, L.A. Dyks, W. Farabolini, V. Rieker
    CERN, Meyrin, Switzerland
  
  The interest for Very High Energy Electron (VHEE) radiotherapy (RT) for cancer treatment recently bloomed, given the present availability of high-gradient accelerator technology for compact, cost effective electron linacs in the 100-200 MeV energy range. Particularly promising is the so called FLASH high dose rate regime, in which cancer cells are damaged while healthy tissue is largely spared. VHEE beams are especially adapted for FLASH RT, given their penetration depth and the high beam current, needed to treat large deep seated tumors. In the CERN Linear Accelerator for Research (CLEAR) facility, a series of unique studies have been initiated on VHEE and FLASH RT issues, in collaboration with several multidisciplinary user groups. In this paper we briefly outline the activities and its main recent results, e.g. on localized dose deposition by beam focusing, and on chemical and biological test to clarify damage mechanisms. We then describe in details the dedicated systems and the techniques adopted - and in large part locally developed by the CLEAR team - in order to satisfy the user requirements, with particular attention to the crucial aspect of high dose rate dosimetry.  
slides icon Slides THPOPA06 [1.183 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOPA06  
About • Received ※ 17 August 2022 — Revised ※ 22 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 16 October 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPOPA15 Anomaly Detection Based Quench Detection System for CW Operation of SRF Cavities cavity, SRF, operation, superconductivity 775
 
  • G. Martino, A. Bellandi, J. Branlard, A. Eichler, H. Schlarb
    DESY, Hamburg, Germany
  • S. Aderhold, A.L. Benwell, D. Gonnella, S.L. Hoobler, J. Nelson, R.D. Porter, A. Ratti, L.M. Zacarias
    SLAC, Menlo Park, California, USA
  • L.R. Doolittle
    LBNL, Berkeley, California, USA
  • G. Fey
    Hamburg University of Technology, Hamburg, Germany
  
  Funding: This work is supported by DASHH (Data Science in Hamburg - HELMHOLTZ Graduate School for the Structure of Matter) under Grant No.: HIDSS-0002.
Superconducting radio frequency (SRF) cavities are used in modern particle accelerators to take advantage of their very high quality factor (Q). A higher Q means that a higher RF field can be sustained, and a higher acceleration can be produced in the cavity for length unity. However, in certain situations, e.g., too high RF field, the SRF cavities can experience quenches that risk creating damage due to the rapid increase in the heat load. This is especially negative in continuous wave (CW) operation due to the impossibility of the system to recover during the off-load period. The design goal of a quench-detection system is to protect the system without being a limiting factor during the operation. In this paper, we compare two different classification approaches for improving a quench detection system. We perform tests using traces recorded from LCLS-II and show that the ARSENAL classifier outperforms a CNN classifier in terms of accuracy. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOPA15  
About • Received ※ 24 August 2022 — Accepted ※ 25 August 2022 — Issue date ※ 23 September 2022  
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPOPA19 Initial High Power RF Driving Test Using Digital LLRF for RF Conditioning of 1 MeV/n RFQ at KOMAC rfq, LLRF, controls, cavity 781
 
  • H.S. Jeong, W.-H. Jung, D.-H. Kim, H.S. Kim, J.H. Kim, K.H. Kim, S.G. Kim, H.-J. Kwon, P. Lee, Y.G. Song
    KOMAC, KAERI, Gyeongju, Republic of Korea
  
  Funding: This work was supported through the KOMAC operation fund by the Ministry of Science and ICT of Korean government.
As a part of R&D toward the RFQ based heavy ion irradiation system, the 1 MeV/n RFQ was designed, brazed, installed and commissioned by staff researchers and engineers at KOMAC of KAERI. This 1 MeV/n RFQ system includes the microwave ion source, EBIS, RFQ, quadrupole magnets, switching magnet and the target systems. The digital based Low-Level RF was developed to provide the stable accelerating field to the RFQ. This Low-Level RF has features such as direct RF detection/generation without mixer, non-IQ sampling, PI feedback control, iterative learning based feed-forward control, and the digital RF interlock. In this paper, the characteristics of Low-Level RF are described, as well as the processes and results of an initial RF driving test for the RFQ’s RF conditioning. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOPA19  
About • Received ※ 22 August 2022 — Revised ※ 28 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 15 September 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPOGE15 Measuring the Seebeck Coefficient at Cryogenic Temperatures for LCLS-II-HE Project niobium, cryogenics, SRF, cryomodule 825
 
  • L. Shpani, M. Ge, A.T. Holic, M. Liepe, J. Sears, N.M. Verboncoeur
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  
  Funding: This work is supported by the DOE LCLS-II HE Project.
The Seebeck effect plays a crucial role during the cooldown procedure in SRF based accelerators, like LCLS-II at SLAC. The temperature-dependent Seebeck coefficient quantitatively measures the strength of electric potential induced by thermal gradients in metals. This effect is present in cryomodules and drives thermoelectric currents generating magnetic fields. These fields can get trapped in cavities and cause additional dissipation in RF fields. We have therefore designed and commissioned an experimental setup that does continuous measurements of the Seebeck coefficient for cryogenic temperatures ranging from 200K down to below 10K. We present results of the measurements of this coefficient for materials commonly used in cryomodules, such as niobium, titanium, niobium-titanium, silicon bronze, and stainless steel. 		 
poster icon Poster THPOGE15 [0.959 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOGE15  
About • Received ※ 27 August 2022 — Revised ※ 04 September 2022 — Accepted ※ 26 September 2022 — Issue date ※ 29 September 2022
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FR1AA06 Fully Automated Tuning and Recover of a High Power SCL cavity, linac, controls, superconducting-cavity 884
 
  • A.P. Shishlo
    ORNL, Oak Ridge, Tennessee, USA
  • C.C. Peters
    ORNL RAD, Oak Ridge, Tennessee, USA
  
  Funding: This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy.
Techniques have been developed for fast (less than one hour), fully automated tune-up a high power proton SCL, as well as fully automated recovery from a cavity failure with no human intervention. These methods have been developed and demonstrated at the SNS SCL but are applicable to hadron SCL operation in general and will be especially relevant to future ADS applications 		 
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slides icon Slides FR1AA06 [1.112 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-FR1AA06  
About • Received ※ 23 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 04 September 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)