Keyword: emittance
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MO2AA04 Electron Ion Collider Strong Hadron Cooling Injector and ERL electron, cavity, linac, hadron 7
 
  • E. Wang, W.F. Bergan, F.J. Willeke
    BNL, Upton, New York, USA
  • S.V. Benson, K.E. Deitrick
    JLab, Newport News, Virginia, USA
  • D. Douglas
    Douglas Consulting, York, Virginia, USA
  • C.M. Gulliford
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • C.E. Mayes, N.W. Taylor
    Xelera Research LLC, Ithaca, New York, USA
  • J. Qiang
    LBNL, Berkeley, California, USA
 
  Funding: The work is supported by Brookhaven Science Associates, LLC under Contract No. DESC0012704 with the U.S. Department of Energy.
Intra-beam Scattering (IBS) and other diffusion mechanisms in the EIC Hadron Storage Ring (HSR) degrade the beam emittances during a store, with growth times of about 2 hours at the nominal proton energies of 275GeV, 100 GeV, and 41 GeV. Strong Hadron Cooling (SHC) can maintain good hadron beam quality and high luminosity during long collision stores. A novel cooling method ’ Coherent electron Cooling (CeC) ’ is chosen as the baseline SHC method, due to its high cooling rates. An Energy Recovery Linac (ERL) is used to deliver an intense high-quality electron beam for cooling. In this paper, we discuss the beam requirements for SHC-CeC and describe the current status of the injector and ERL designs. Two designs of injector and ERL will be presented: one for dedicated SHC and another one for SHC with precooler.
 
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slides icon Slides MO2AA04 [4.436 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MO2AA04  
About • Received ※ 23 August 2022 — Revised ※ 25 August 2022 — Accepted ※ 27 August 2022 — Issue date ※ 31 August 2022
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MOPOPA12 Preserving Bright Electron Beams: Distorted CSR Kicks dipole, electron, radiation, synchrotron-radiation 91
 
  • A. Dixon, T.K. Charles
    The University of Liverpool, Liverpool, United Kingdom
  • T.K. Charles, P.H. Williams
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • S. Thorin
    MAX IV Laboratory, Lund University, Lund, Sweden
  • P.H. Williams
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
 
  Short pulse, low emittance electron beams are necessary to drive bright FEL X-rays, for this reason it is important to preserve and limit emittance growth. The strong bunch compression required to achieve the short bunches, can lead to coherent synchrotron radiation (CSR)-induced emittance growth, and while there are some methods of CSR cancel- lation, these methods may be less effective when the CSR kicks are distorted. In an attempt to understand why CSR kicks become distorted, we compare the CSR kicks calcu- lated using the whole beam parameters to the CSR kicks calculated using the longitudinally sliced beam parameters, when propagated to the end of the bunch compressor. We find that CSR kicks can become distorted when calculated with non-uniform slice beam parameters. While slice beam parameters that are uniform along the centre of the bunch, do not result in distorted CSR kicks.  
poster icon Poster MOPOPA12 [1.553 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA12  
About • Received ※ 24 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 27 August 2022 — Issue date ※ 31 August 2022
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MOPOPA16 UNILAC Heavy Ion Beam Operation at FAIR Intensities space-charge, heavy-ion, brilliance, injection 102
 
  • W.A. Barth, M. Miski-Oglu, U. Scheeler, H. Vormann, M. Vossberg, S. Yaramyshev
    GSI, Darmstadt, Germany
  • M. Miski-Oglu
    HIM, Mainz, Germany
 
  The GSI-UNILAC as well as the heavy ion synchrotron SIS18 will serve as a high current heavy ion injector for the FAIR synchrotron SIS100. In the context of an advanced machine investigation program acceleration and transport of space charge dominated argon beam inside entire UNILAC have been explored. The conducted high current argon beam measurements throughout the UNILAC-poststripper and transferline to SIS18 show a transversal emittance growth of only 35% for the design current of 7 emA (40Ar10+). By horizontal collimation of the UNILAC beam emittance, the space charge limit could be reached at slightly lower pulse currents, but accordingly longer injection times. Further improvements in brilliance can be expected from the planned upgrade measures, in particular on the high-current injector linac.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA16  
About • Received ※ 19 August 2022 — Revised ※ 22 August 2022 — Accepted ※ 26 August 2022 — Issue date ※ 01 September 2022
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MOPOPA18 High Intensity Heavy Ion Beam Optimization at GSI UNILAC heavy-ion, brilliance, operation, rfq 110
 
  • H. Vormann, W.A. Barth, M. Miski-Oglu, U. Scheeler, M. Vossberg, S. Yaramyshev
    GSI, Darmstadt, Germany
 
  To improve the UNILAC’s performance for the upcoming use as heavy ion injector for the FAIR accelerator chain, dedicated beam investigations have been carried out. In particular measurements with Bismuth and Uranium beams require the highest accelerating voltages and powers of the rf cavities, the rf transmitters and the magnet power converters. After four years without Uranium operation (resp. with Uranium, but restricted cavity voltages), the UNILAC has now been operated again with a performance close to that of former years. Several upgrade measures will improve the UNILAC capability. In combination with the prototype pulsed gas stripper with hydrogen gas, beam intensities not far below the FAIR requirements can already now be expected.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA18  
About • Received ※ 24 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 28 August 2022 — Issue date ※ 01 September 2022
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MOPOPA24 High-Brightness RFQ Injector for LANSCE Multi-Beam Operation rfq, quadrupole, operation, solenoid 130
 
  • Y.K. Batygin, D.A.D. Dimitrov, I. Draganić, D.V. Gorelov, E. Henestroza, S.S. Kurennoy
    LANL, Los Alamos, New Mexico, USA
 
  Funding: Work supported by US DOE under contract 89233218CNA000001
The unique feature of the LANSCE accelerator facility is multi beam operation. Accelerator delivers 100 MeV H+ and 800 MeV H beams to five experimental areas. The LANSCE front end is equipped with two independent injectors for H+ and H beams, merging at the entrance of a Drift Tube Linac (DTL). Existing Cockcroft-Walton (CW) - based injector provides conservation of high value of beams brightness before injection into DTL. To reduce long-term operational risks and support beam delivery with high reliability, we designed an RFQ-based front end as a modern injector replacement for the CW injectors. Proposed injector includes two independent low-energy transports merging beams at the entrance of a single RFQ, which accelerates simultaneously both protons and H ions with multiple flavors of the beams. Paper discusses details of beam physics design and presents injector parameters.
 
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poster icon Poster MOPOPA24 [5.806 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA24  
About • Received ※ 21 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 28 August 2022 — Issue date ※ 01 September 2022
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MOPOGE17 CST Modeling of the LANSCE Coupled-Cavity Linac cavity, alignment, linac, quadrupole 191
 
  • S.S. Kurennoy, Y.K. Batygin
    LANL, Los Alamos, New Mexico, USA
 
  The 800-MeV proton linac at LANSCE consists of a drift-tube linac, which brings the beam to 100 MeV, followed by 44 modules of a coupled-cavity linac (CCL). Each CCL module contains multiple tanks, and it is fed by a single 805-MHz klystron. CCL tanks are multi-cell blocks of identical re-entrant side-coupled cavities, which are followed by drifts with magnetic quadrupole doublets. Bridge couplers - special cavities displaced from the beam axis - electromagnetically couple CCL tanks over such drifts within a module. We have developed 3D CST models of CCL tanks. The models are used to calculate electromagnetic fields in the tanks. Beam dynamics is modelled in CST for bunch trains with realistic beam distributions using the calculated RF fields and quadrupole magnetic fields. Beam dynamics results are crosschecked with other multi-particle codes and applied to evaluate effects of CCL misalignments.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE17  
About • Received ※ 22 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 02 September 2022  
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MOPORI10 First Studies of 5D Phase-Space Tomography of Electron Beams at ARES electron, simulation, experiment, 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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TUPOJO11 Design of Beam Focusing System with Permanent Magnet for J-PARC LINAC MEBT1 octupole, MEBT, linac, focusing 364
 
  • Y. Fuwa, K. Moriya, T. Takayanagi
    JAEA/J-PARC, Tokai-mura, Japan
 
  Space charge compensation technology using higher-order multipole magnetic field components has been proposed to transport high-intensity charged particle beams for J-PARC LINAC MEBT1. In order to realize this compensation technology in a limited beam line space, we devised a compact-size combined-function multipole permanent magnet. This magnet can produce two multipole components at the same location on the beam line. As a first step, we have designed a magnet to simultaneously generate a fixed-strength quadrupole and an adjustable-strength octupole component using permanent magnet materials. In this magnet model, the magnetic circuit consists of two groups of magnets.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO11  
About • Received ※ 20 August 2022 — Revised ※ 27 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 02 September 2022
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TUPOJO12 Development of Emittance Meter Instrument for MYRRHA controls, EPICS, radiation, LEBT 368
 
  • A. Rodríguez Páramo, I. Bustinduy, S. Masa, R. Miracoli, V. Toyos, S. Varnasseri
    ESS Bilbao, Zamudio, Spain
  • L. De Keukeleere, F. Doucet, A. Ponton, A. Tanquintic
    SCK•CEN, Mol, Belgium
  • J. Herranz
    Proactive Research and Development, Sabadell, Spain
 
  For the commissioning of the Myrrha proton Linac an Emittance Meter Instrument (EMI) has been foreseen. The EMI will be installed in a dedicated test bench for linac commissioning. The test bench will be initially placed after the RFQ with energies of 1.5 MeV, and in later stages moved to other sections of the Normal Con-ducting Linac for operation at 6 and 17 MeV. The Myrrha EMI will be composed by two slit and grid subsystems for measurement of the phase space in the horizontal and vertical directions. For collimating the beam, graphite slits are used, and the beam aperture is measured in the SEM grids placed downstream. Then, the control system performs signal amplification, data acquisition, and motion control, with the different sys-tems integrated in an EPICs IOC. The system, manufactured by ESS-Bilbao and Proac-tive R&D, has been tested on the ESS-Bilbao 45 keV and soon will be integrated in Myrrha facilities. We present the EMI design, with irradiation analysis and emittance reconstruction, and the integration tests results.  
poster icon Poster TUPOJO12 [1.141 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO12  
About • Received ※ 19 August 2022 — Revised ※ 30 August 2022 — Accepted ※ 02 September 2022 — Issue date ※ 07 September 2022
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TUPOPA04 First Beam Matching and Transmission Studies on the ESS RFQ rfq, LEBT, MMI, space-charge 414
 
  • D. Noll, R.A. Baron, C.S. Derrez, E.M. Donegani, M. Eshraqi, F. Grespan, H. Hassanzadegan, B. Jones, Y. Levinsen, N. Milas, R. Miyamoto, D.C. Plostinar, A.G. Sosa, R. Zeng
    ESS, Lund, Sweden
  • A.C. Chauveau, O. Piquet
    CEA-IRFU, Gif-sur-Yvette, France
 
  The European Spallation Source will be driven by a 5 MW linear accelerator, producing 2.86 ms long proton beam pulses with a peak current of 62.5 mA at 14 Hz. Following the source commissioning in 2018 and 2019, the RFQ was successfully conditioned and subsequently commissioned with beam in 2021. In this paper, we will present results of studies on beam matching to the RFQ, both for low and high current beam modes, and will compare these results to model predictions.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOPA04  
About • Received ※ 26 August 2022 — Accepted ※ 05 September 2022 — Issue date ※ 05 September 2022  
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TUPOPA10 Beam Dynamics and RF Design Studies for the New RFQ for CERN Linac4 Upgrade rfq, linac, radio-frequency, quadrupole 430
 
  • H.W. Pommerenke, G. Bellodi, A. Grudiev, S. Kumar, A.M. Lombardi
    CERN, Meyrin, Switzerland
 
  The 352 MHz Linac4-RFQ is the first rf accelerating structure of the CERN accelerator complex, accelerating an H beam to 3 MeV. After successful commissioning in 2013, superficial vane damage has been observed in 2020. In view that the RFQ is a single point of failure, in parallel to the production of a near identical spare (RFQ2), design studies on a longer-term upgrade have been launched: Linac4-RFQ3. Main goals are to achieve a design with higher beam acceptance, reduced beam losses, and reduced RF breakdown rate. Two versions of RFQ are under study: a conventional RFQ built by brazing copper, as well as an RFQ with titanium vane tips (brazed on copper). High-gradient experiments suggest that titanium vane tips support higher surface fields compared to copper, up to 40 MV/m, and are more resistant against beam irradiation. In this paper, we present beam dynamics and rfdesign of both variants of RFQ3.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOPA10  
About • Received ※ 12 August 2022 — Revised ※ 19 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 02 September 2022
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TUPORI05 Beam Dynamic Simulations for the DTL Section of the High Brilliance Neutron Source cavity, linac, neutron, quadrupole 556
 
  • S. Lamprecht, M. Droba, K. Kümpel, O. Meusel, N.F. Petry, H. Podlech, M. Schwarz, C. Zhang
    IAP, Frankfurt am Main, Germany
 
  As various experimental reactors in Europe are already or will be decommissioned over the next years, new neutron sources will be necessary to meet the demand for neutrons in research and development. The High Brilliance Neutron Source is an accelerator driven neutron source planned at the Forschungszentrum Jülich. The accelerator will accelerate a proton beam of 100 mA up to an end energy of 70 MeV, using 45 normal conducting CH-type cavities. Due to the high beam current, the beam dynamics concept requires special care. In this paper, the current status of the beam dynamics for the drift tube linac is presented.  
poster icon Poster TUPORI05 [0.917 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI05  
About • Received ※ 23 August 2022 — Revised ※ 24 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 01 September 2022
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TUPORI06 Harmonic Bunch Formation and Optional RFQ Injection rfq, space-charge, injection, cavity 559
 
  • E. Sunar, U. Ratzinger, M. Syha, R. Tiede
    IAP, Frankfurt am Main, Germany
 
  With the aim of reduced beam emittances, a pre-bunching concept into an RFQ or a DTL has been developed. The structure has been designed by using a two harmonics double drift buncher which consists of two bunchers: the first one is driven by a fundamental frequency whereas the other is ex- cited with the second harmonic including a drift in between. This well-known "Harmonic Double-Drift-Buncher" is rein- vestigated under space charge conditions for RFQ, cyclotron, and for direct DTL-injection. There are significant benefits for this design such as to catch as many particles as possible from a dc beam into the longitudinal linac acceptance, or to reduce/optimize by up to an order of magnitude the lon- gitudinal emittance for low and medium beam currents. In accordance to these advantages, a new multi-particle track- ing beam dynamics code has been developed which is called "Bunch Creation from a DC beam - BCDC". In this paper we present this new code and some stimulating examples.  
poster icon Poster TUPORI06 [28.234 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI06  
About • Received ※ 14 August 2022 — Revised ※ 24 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 05 September 2022
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TUPORI08 End-to-End Simulations and Error Studies of the J-PARC Muon Linac linac, experiment, 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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TUPORI12 Beam Dynamics for the MAX IV Transverse Deflecting Cavity Beamline linac, electron, quadrupole, optics 565
 
  • N. Blaskovic Kraljevic, L. Isaksson, E. Mansten, S. Thorin
    MAX IV Laboratory, Lund University, Lund, Sweden
 
  The MAX IV 3 GeV linac delivers electron beams to two synchrotron rings and to a dedicated undulator system for X-ray beam delivery in the Short Pulse Facility (SPF). In addition, there are plans to use the linac as an injector for a future Soft X-ray Laser (SXL). For both SPF and SXL operations, longitudinal beam characterisation with a high temporal resolution is essential. For this purpose, a transverse deflecting cavity (TDC) system has been developed and is being installed in a dedicated electron beamline branch located downstream of the 3 GeV linac. This beamline consists of two consecutive 3 m long transverse S-band RF structures, followed by a variable vertical deflector dipole magnet used as an energy spectrometer. This conference contribution presents the beam dynamics calculations for the beam transport along the TDC beamline, and in particular the optics configurations for slice emittance and slice energy spread measurements. The operation of an analysis algorithm for use in the control room is discussed. The aim is to provide 1 fs temporal measurement resolution to access the bunch duration of highly compressed bunches and slice parameters for sub-10-fs bunches.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI12  
About • Received ※ 24 August 2022 — Revised ※ 25 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 15 September 2022
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TUPORI14 A Start-to-End Optimisation Strategy for the CompactLight Accelerator Beamline FEL, electron, undulator, simulation 573
 
  • Y. Zhao, A. Latina
    CERN, Meyrin, Switzerland
  • A. Aksoy
    Ankara University, Accelerator Technologies Institute, Golbasi, Turkey
  • H.M. Castañeda Cortés, D.J. Dunning, N. Thompson
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
 
  The CompactLight collaboration designed a compact and cost-effective hard X-ray FEL facility, complemented by a soft X-ray option, based on X-band acceleration, capable of operating at 1 kHz pulse repetition rate. In this paper, we present a new simple start-to-end optimisation strategy that is developed for the CompactLight accelerator beamline, focusing on the hard X-ray mode. The optimisation is divided into two steps. The first step improves the electron beam quality that finally leads to a better FEL performance by optimising the major parameters of the beamline. The second step provides matched twiss parameters for the FEL undulator by tuning the matching quadrupoles at the end of the accelerator beamline. A single objective optimisation method, with different objective functions, is used to optimise the performance. The sensitivity of the results to jitters is also minimised by including their effects in the final objective function.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI14  
About • Received ※ 15 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 15 September 2022
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TUPORI16 The PSI Positron Production Project positron, cavity, solenoid, electron 577
 
  • N. Vallis, B. Auchmann, P. Craievich, M. Duda, H. Garcia Rodrigues, J. Kosse, F. Marcellini, M. Schaer, R. Zennaro
    PSI, Villigen PSI, Switzerland
 
  Funding: CHART (Swiss Accelerator Research and Technology)
The PSI Positron Production project (P3 or P-cubed) is a demonstrator for a novel positron source for FCC-ee. The high current requirements of future colliders can be compromised by the extremely high positron emittance at the production target and consequent poor capture and transport to the damping ring. However, recent advances in high-temperature superconductors allow for a highly efficient matching of such an emittance through the use a solenoid around the target delivering a field over 10 T on-axis. Moreover, the emittance of the matched positron beam can be contained through large aperture RF cavities surrounded by a multi-Tesla field generated by conventional superconducting solenoids, where simulations estimate a yield higher by one order of magnitude with respect to the state-of-the-art. The goal of P3 is to demonstrate this basic principle by implementing the aforementioned solenoids into a prototype positron source based on a 6 GeV electron beam from the SwissFEL linac, two RF capture cavities and a beam diagnostics section.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI16  
About • Received ※ 15 August 2022 — Revised ※ 24 August 2022 — Accepted ※ 02 September 2022 — Issue date ※ 09 September 2022
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TUPORI17 Emittance Measurement from the Proton Testbeam at KAHVELab LEBT, simulation, proton, rfq 581
 
  • D. Halis
    YTU, Istanbul, Turkey
  • S. Aciksoz, E.V. Ozcan
    Bogazici University, Bebek / Istanbul, Turkey
  • A. Adiguzel, S. Esen, S. Oz
    Istanbul University, Istanbul, Turkey
  • H. Cetinkaya
    Dumlupinar University, Faculty of Science and Arts, Kutahya, Turkey
  • T.B. Ilhan
    Bogaziçi University, Kandilli Accelerator, Istanbul, Turkey
  • A. Kilicgedik
    Marmara University, Istanbul, Turkey
  • S. Ogur
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  • G. Unel
    UCI, Irvine, California, USA
 
  Funding: This study is supported by Istanbul University Scientific Research Commission Project ID 33250 and TUBITAK Project no : 119M774.
A testbeam using a Radio Frequency Quadrupole (RFQ) operating at 800 MHz, to accelerate a 1.5mA proton beam to 2MeV energy has been designed, manufactured and is currently being commissioned at KAHVELab, Istanbul. The beam from the microwave discharge ion source (IS) must be matched to the RFQ via an optimized Low Energy Beam Transport (LEBT) line. The LEBT line consists of two solenoid magnets, two stereer magnets and a beam diagnostics station named MBOX. All the beamline components are locally designed, simulated, manufactured and tested with local resources. The MBOX should be able to measure the beam current and profile, as well as the beam emittance, to ensure an accurate match between IS and RFQ. It includes a number of diagnostic tools: a Faraday Cup, a scintillator screen, and a pepper pot plate (PP). An analysis software is developed and tested for the PP photo analysis. This contribution will present the proton beamline components and will focus on the MBOX measurements, especially on the PP emittance analysis.
 
poster icon Poster TUPORI17 [5.641 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI17  
About • Received ※ 23 August 2022 — Revised ※ 09 September 2022 — Accepted ※ 26 September 2022 — Issue date ※ 29 September 2022
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TUPORI23 Investigation of the Beam Propagation Through the FNAL LEBT LEBT, ion-source, linac, rfq 597
 
  • D.C. Jones, D.S. Bollinger, V.V. Kapin, K. Seiya
    Fermilab, Batavia, Illinois, USA
 
  Fermilab Preaccelerator sends 25 mA H beam with a 30 µs pulse length at 15 Hz. The machine’s uptime was increased in 2012 by the replacement of the Cockcroft Walton accelerator with an RFQ system to take the beam from 35 keV to 750 keV; however, this came with a reduction in transmitted beam between the source and the entrance to Tank 1 of the LINAC. Fermilab currently operates with less than 50% of the beam current from the ion source making it to the entrance of tank 1. In an effort to understand the causes of this reduction in transmission efficiency a vertically movable paddle was installed between the first two solenoids allowing the beam size to be investigated before entering the RFQ. Comparing this data to the emittance measurements done after the first solenoid in the Ion Source R&D lab a more complete picture of the beams propagation through the LEBT has begun to be established when compared with the simulation results. We will present these results here.  
poster icon Poster TUPORI23 [0.510 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI23  
About • Received ※ 14 August 2022 — Revised ※ 19 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 15 September 2022
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TUPORI24 Beam Dynamics Studies at the PIP-II Injector Test Facility MEBT, cryomodule, rfq, solenoid 601
 
  • J.-P. Carneiro, B.M. Hanna, E. Pozdeyev, L.R. Prost, A. Saini, A.V. Shemyakin
    Fermilab, Batavia, Illinois, USA
 
  A series of beam dynamic studies were performed in 2020-2021 at the PIP-II Injector Test Facility (PIP2IT) that has been built to validate the concept of the front-end of the PIP-II linac being constructed at Fermilab. PIP2IT is comprised of a 30-keV H ion source, a 2 m-long Low Energy Beam Transport (LEBT), a 2.1- MeV CW RFQ, followed by a 10-m Medium Energy Beam Transport (MEBT), 2 cryomodules accelerating the beam to 16 MeV and a High-Energy Beam Transport (HEBT) bringing the beam to an absorber. This paper presents beam dynamics - related measurements performed at PIP2IT as the Twiss parameters with Allison scanners, beam envelopes along the injector, and transverse and longitudinal rms emittance reconstruction. These measurements are compared with predictions from the beam dynamics code Tracewin.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI24  
About • Received ※ 21 August 2022 — Revised ※ 25 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 15 September 2022
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TUPORI26 Longitudinal Beam Dynamics in Array of Equidistant Multicell Cavities cavity, linac, acceleration, space-charge 609
 
  • Y.K. Batygin
    LANL, Los Alamos, New Mexico, USA
 
  Funding: Work supported by US DOE under contract 89233218CNA000001
Linear accelerators containing the sequence of independently phase cavities with constant geometrical velocity along each cavity are widely used in practice. The chain of cavities with identical cell length is utilized within a certain beam velocity range, with subsequent transformation to the next chain with higher cavity velocity. Design and analysis of beam dynamics in this type of accelerators are usually performed using numerical simulations. In the present paper, we provide an analytical treatment of beam dynamics in such linacs. Expressions connecting beam energy gain and phase slippage along the cavity are implemented. The dynamics of the beam around the reference trajectory along the accelerator and matched beam conditions are discussed.
 
poster icon Poster TUPORI26 [1.718 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI26  
About • Received ※ 20 August 2022 — Revised ※ 28 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 02 September 2022
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THPOJO26 Conceptual Design of the PERLE Injector linac, space-charge, dipole, quadrupole 743
 
  • B. Hounsell, M. Klein, C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  • B. Hounsell, B.L. Militsyn, C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • B. Hounsell, W. Kaabi
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  • B.L. Militsyn
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
 
  Energy Recovery Linacs such as PERLE require high average current high brightness beams. This sets particular requirements on the kind of injectors that they can use as the injectors must be capable of producing bunches at MHz repetition rates, compressing the bunches to the specified value and transporting those bunches while they are still in the space charge dominated regime into the main ERL all while keeping the emittance low. In particular, PERLE will require a 20 mA beam consisting of 500 pC bunches with a repetition rate of 40 MHz. These bunches will be required to have rms lengths of 3mm, a total beam energy of 7 MeV, appropriate Twiss parameters to match them to the main loop and transverse emittances of < 6 mm mrad. In this paper, a DC gun based injector capable of meeting this specification will be presented with beam dynamics simulation showing the behaviour of the beam from the photocathode to the exit of the first main linac pass. The beam dynamics challenges will be discussed in terms of both the transverse emittance growth and the sources of non-linearity in the longitudinal phase space.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOJO26  
About • Received ※ 20 August 2022 — Revised ※ 24 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 15 September 2022
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THPORI09 Design and Optimization of a 1.3 GHz Gridded Thermionic Electron Gun for High-Intensity Compact Superconducting Electron Accelerator (HICSEA) cathode, gun, electron, focusing 851
 
  • A.B. Kavar, A. Pathak, R. Varma
    IIT Mumbai, Mumbai, India
 
  The design and optimization of the proposed 1.3 GHz gridded thermionic electron gun aims to drive a conduction cooled superconducting electron accelerator that will be used to treat contaminants of emerging concern in water bodies. The gun geometry is Pierce-type and optimized for beam current of 1A with LaB6 as cathode material at cathode potential of -100 kV. The final optimized cathode radius and angle of inclination of the focusing electrode are found to be 1.5 mm, and 77 degree respectively. For an emittance compensation electrode, the optimized values for thickness and potential are 2 mm and -50 kV respectively, and separation between cathode and compensator is 8 mm. Beam dynamics calculations have been performed with self-developed particle tracking code that assumes space charge interactions and imported fields. The beam dynamics simulations show that with an initial bunch length of 50 ps having a bunch charge of 5 pC, the bunch length of the bunch reduces to 33 ps. The diameter, transverse and longitudinal emittance obtained are 2.8 mm, 1 mm-mrad and 5 mm-mrad respectively.  
poster icon Poster THPORI09 [1.238 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPORI09  
About • Received ※ 11 August 2022 — Revised ※ 14 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 16 September 2022
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FR1AA04 SARAF Commissioning: Injector, MEBT and Chopper rfq, MEBT, diagnostics, MMI 872
 
  • J. Dumas, D. Chirpaz, D. Darde, J. Dumas, R.D. Duperrier, G. Ferrand, A. Gaget, F. Gohier, F. Gougnaud, T.J. Joannem, V. Nadot, N. Pichoff, F. Senée, C. Simon, D.U. Uriot, L. Zhao
    CEA-IRFU, Gif-sur-Yvette, France
  • A. Chancé
    CEA, Gif-sur-Yvette, France
  • S. Cohen, I.G. Gertz, N. Goldberger, H. Isakov, B. Kaizer, A. Kreisel, J. Luner, I. Mardor, H. Paami, A. Perry, I. Polikarpov, E. Reinfeld, J. Rodnitsky, I. Shmuely, A. Shor, Y. Solomon, N. Tamim, R. Weiss-Babai, L. Weissman, T. Zchut
    Soreq NRC, Yavne, Israel
  • G. Desmarchelier, N. Solenne
    CEA-DRF-IRFU, France
 
  IAEC/SNRC (Israel) is constructing an accelerator fa-cility, SARAF, for neutron production. It is based on a linac accelerating 5 mA CW deuteron and proton beam up to 40 MeV. As a first phase, IAEC constructed and operated a linac (SARAF Phase I), from which remains an ECR ion source, a Low-Energy Beam Transport (LEBT) line and a 4-rod RFQ. Since 2015, IAEC and CEA (France) are collaborating in the second phase, consisting in manufacturing of the linac (Figure 1). The injector control-system has been recently updated and the Medium Energy Beam Transport (MEBT) line has been installed and integrated to the infrastructure. It has been partially commissioned during the first semester of 2022. This paper presents the results of the integration, tests and commissioning of the injector and MEBT, be-fore delivery of the cryomodules.  
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slides icon Slides FR1AA04 [2.971 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-FR1AA04  
About • Received ※ 21 August 2022 — Revised ※ 27 August 2022 — Accepted ※ 14 September 2022 — Issue date ※ 15 September 2022
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FR1AA05 Design Considerations for a Proton Linac for a Compact Accelerator Based Neutron Source DTL, MEBT, neutron, rfq 878
 
  • M. Abbaslou
    UVIC, Victoria, Canada
  • A. Gottberg, O.K. Kester, R.E. Laxdal, M. Marchetto
    TRIUMF, Vancouver, Canada
  • D.D. Maharaj, D. Marquardt
    University of Windsor, Windsor, Ontario, Canada
  • S. Tabbassum
    Purdue University, West Lafayette, Indiana, USA
 
  New neutron sources are needed both for Canada and internationally as access to reactor based neutrons shrinks. Compact Accelerator-based Neutron Sources (CANS) offer the possibility of an intense source of pulsed neutrons with a capital cost significantly lower than spallation sources. In an effort to close the neutron gap in Canada a prototype, Canadian compact accelerator-based neutron source (PC-CANS) is proposed for installation at the University of Windsor. The PC-CANS is envisaged to serve two neutron science instruments, a boron neutron capture therapy (BNCT) station and a beamline for fluorine-18 radioisotope production for positron emission tomography (PET). To serve these diverse applications of neutron beams, a linear accelerator solution is selected, that will provide 10 MeV protons with a peak current of 10 mA within a 5% duty cycle. The accelerator is based on an RFQ and DTL with a post-DTL pulsed kicker system to simultaneously deliver macro-pulses to each end-station. Several choices of Linac technology are being considered and a comparison of the choices will be presented.  
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slides icon Slides FR1AA05 [1.945 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-FR1AA05  
About • Received ※ 27 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 03 September 2022
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