LINAC2022 - Classification: Proton and Ion Accelerators and Applications / Ion linac projects

Paper	Title	Page
MO1AA01	Upgrades and Developments at the ISIS Linac	1
	A.P. Letchford STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	The ISIS Spallation Neutron Source at the Rutherford Appleton Laboratory (RAL) in the UK has a 70 MeV H⁻ linac operating at 202.5 MHz. The linac consists of a 665 keV RFQ and a 4-tank Drift Tube Linac (DTL). In order to ensure continued reliability, increase performance and lay the groundwork for possible facility upgrades in the future a programme of R&D has been taking place in recent years. This paper will discuss three components of that programme: the complete replacement of DTL Tank 4; the design of a Medium Energy beam Transport (MEBT) between the RFQ and DTL; and the Front End Test Stand (FETS), a demonstrator for the front end of a future high current, high energy linac.
	Slides MO1AA01 [26.001 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MO1AA01
About •	Received ※ 16 August 2022 — Revised ※ 25 August 2022 — Accepted ※ 27 August 2022 — Issue date ※ 27 September 2022
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MO1AA02	Completion of FRIB Beam Commissioning
	T. Maruta FRIB, East Lansing, Michigan, USA
	Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DESC0000661 In April 2021, FRIB became the highest energy heavy-ion linac in the world with the acceleration of Kr-86 to 212 MeV/u using all 46 cryomodules containing 324 SC cavities. Also, three-charge state Xe-124 was accelerated to the same energy with the intensity increase by the factor of 2.5 compared to the single charge state. Many High-Level Physics Applications were developed and used during the commissioning, allowing quick beam commissioning progress. For the first time, the stripping with liquid Li film was tested with Ar, Xe, and U beams in the energy range 17 MeV/u to 20 MeV/u.

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	Slides MO1AA02 [5.150 MB]
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MOPOPA15	Three Years of Operation of the SPIRAL2 SC LINAC- RF Feedback	98
	M. Di Giacomo, M. Aburas, P.-E. Bernaudin, O. Delahaye, A. Dubosq, A. Ghribi, J.-M. Lagniel, J.F. Leyge, G. Normand, A.K. Orduz, F. Pillon, L. Valentin GANIL, Caen, France F. Bouly LPSC, Grenoble Cedex, France S. Sube CEA-DRF-IRFU, France
	The superconducting LINAC of SPIRAL2 at the GANIL facility has been in operation since October 2019. The accelerator uses 12 low beta and 14 high beta supercon-ducting quarter wave cavities, cooled at 4°K, working at 88 MHz. The cavities are operated at a nominal gradient of 6.5 MV/m and are independently powered by a LLRF and a solid-state amplifier, protected by a circulator. Pro-ton and deuteron beam currents can reach 5 mA and beam loading perturbation is particularly strong on the first cavities, as they are operated at field levels much lower than the nominal one. This paper presents a feedback after three years of oper-ation, focuses on the RF issues, describing problems and required improvement on the low level, control and pow-er systems
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA15
About •	Received ※ 14 August 2022 — Revised ※ 17 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 02 September 2022
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MOPOPA16	UNILAC Heavy Ion Beam Operation at FAIR Intensities	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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MOPOPA17	RF Commissioning of the First-of-Series Cavity Section of the Alvarez 2.0 at GSI	106
	M. Heilmann, L. Groening, C. Herr, M. Hoerr, S. Mickat, B. Schlitt, G. Schreiber GSI, Darmstadt, Germany
	The existing post-stripper DTL of the GSI UNILAC will be replaced with the new Alvarez 2.0 DTL to serve as the injector chain for the Facility of Antiproton and Ion Research (FAIR). The 10⁸.4 MHz Alvarez 2.0 DTL with a total length of 55 meters has an input energy of 1.36 MeV/u and the output energy is 11.32 MeV/u. The presented First-of-Series (FoS) cavity section with 11 drift tubes and a total length of 1.9 m is the first part of the first cavity of the Alvarez 2.0 DTL. After copper plating and assembly of the cavity the RF-conditioning started in July 2021. These proceeding gives an overview on the results of the successfully RF-conditioning to reach the necessary gap voltage for uranium operation including a comfortable safety margin.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA17
About •	Received ※ 24 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 01 September 2022
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MOPOPA18	High Intensity Heavy Ion Beam Optimization at GSI UNILAC	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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MOPOPA19	Preparation for Commissioning with Beam of "Advanced Demonstrator" Module with Heavy Ion Beam	114
	M. Miski-Oglu, W.A. Barth, M. Basten, C. Burandt, F.D. Dziuba, T. Kürzeder, S. Lauber, J. List, S. Yaramyshev HIM, Mainz, Germany W.A. Barth, M. Basten, C. Burandt, F.D. Dziuba, V. Gettmann, T. Kürzeder, S. Lauber, J. List, S. Yaramyshev GSI, Darmstadt, Germany W.A. Barth, F.D. Dziuba, S. Lauber, J. List KPH, Mainz, Germany H. Podlech, M. Schwarz IAP, Frankfurt am Main, Germany
	The integration of the accelerator components in to the cryogenic module prototype (Advanced Demonstrator) is a major milestone of the R&D for the superconducting heavy ion continuous wave linear accelerator HELIAC at GSI. The HELIAC is joint project of Helmholtz Institute Mainz (HIM) and GSI developed in collaboration with IAP Goethe University Frankfurt. This module is equipped with three superconducting (sc) Cross bar H-mode (CH) acceleration cavities CH0-CH2 and a sc rebuncher cavity, as well as two sc solenoids. The commissioning of the cryogenic module with Argon beam at GSI is scheduled for August 2023. In preparation for the beam test activities, the beamline, which connects the High Charge State Injector (HLI) with the testing area, has been installed. The beamline comprises a pair of phase probes for Time Of Flight (TOF) measurement of the incoming beam energy, quadrupole lenses and a 4-gap RF-buncher cavity. The beam diagnostics bench behind the cryo module is equipped with phase probe pairs, a slit-grid device, a bunch shape monitor (Feshenko monitor) for measurements of the longitudinal beam profile. The bench allows complete 6d characterization of the ion beam.
	Poster MOPOPA19 [3.074 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA19
About •	Received ※ 24 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 04 September 2022
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MOPOPA20	Q Drop Tendency of Half-Wave Resonator Cavity	118
	Y. Jung, H. Jang, H. Kim, H. Kim, J.W. Kim IBS, Daejeon, Republic of Korea S. Jeon Kyungpook National University, Daegu, Republic of Korea
	All HWRs (half-wave resonator superconducting cavities) have been fabricated and installed in the low energy section of the LINAC in IBS. All HWR cavities have been tested (vertical tests, VT) both at 4.2 K and 2.1 K cryogenic surroundings although operating temperature of HWRs is 2.1 K. Good cavities of high quality factors showed the Q drop tendency of 2.1 k were very similar to that of 4.2 K. However, in many cases, Q drop tendency of 2.1 K were not similar with 4.2 K, rather Q decreased more rapidly than 4.2 K which means the surface resistance of the cavity rapidly increased at 2 K surrounding. In this study, we will report that various Q results of HWRs and compare their Q drop tendency as a function of temperature, 2.1 K and 4.2 K.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA20
About •	Received ※ 23 August 2022 — Revised ※ 28 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 01 September 2022
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MOPOPA21	RF Beam Sweeper for Purifying In-Flight Produced Rare Isotope Beams at ATLAS Facility	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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MOPOPA24	High-Brightness RFQ Injector for LANSCE Multi-Beam Operation	130
MOOPA06	use link to see paper's listing under its alternate paper code
	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.
	Slides MOPOPA24 [3.266 MB]
	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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TU2AA02	SPIRAL2 Final Commissioning Results	314
	A.K. Orduz, P.-E. Bernaudin, M. Di Giacomo, R. Ferdinand, B. Jacquot, O. Kamalou, J.-M. Lagniel, G. Normand, A. Savalle GANIL, Caen, France D.U. Uriot CEA-DRF-IRFU, France
	The commissioning of SPIRAL2 was carried out in different steps and slots from 2014 to end 2021. In a first phase, the proton-deuteron and heavy ion sources, LEBT lines and RFQ were commissioned and validated with A/Q=1 up to 3 particles. The validation of the MEBT (between the RFQ and the linac, including the Single Bunch Selector), linac and HEBT lines (up to the beam dump and to the NFS experimental room) started on July 2019, when GANIL received the authorization to operate SPIRAL2. The linac tuning is now validated with H⁺, 4He2+ and D⁺ and nominal H⁺ and D⁺ beams were sent to NFS for physics experiments. The main results obtained during the commissioning stages and the strategy used by the commissioning team are presented.

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	Slides TU2AA02 [3.724 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TU2AA02
About •	Received ※ 24 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 02 September 2022
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TU2AA03	Status and Beam Commissioning of the RAON Superconducting Linac
	M. Kwon IBS, Daejeon, Republic of Korea
	Installation of the low energy superconducting linac was completed by 2021 and first cool-down will be started soon followed by the beam commissioning. Status of the cool-down and the preparation of the beam commissioning will be presented and first result of the injector beam commissioing of the RAON heavy ion accelerator will be summarized.

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	Slides TU2AA03 [9.494 MB]
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TU2AA04	Commissioning of IFMIF Prototype Accelerator Towards CW Operation	319
	K. Masuda, T. Akagi, A. De Franco, T. Ebisawa, K. Hasegawa, K. Hirosawa, J. Hyun, T. Itagaki, A. Kasugai, K. Kondo, K. Kumagai, S. Kwon, A. Mizuno, Y. Shimosaki, M. Sugimoto QST Rokkasho, Aomori, Japan T. Akagi, Y. Carin, F. Cismondi, A. De Franco, D. Gex, K. Hirosawa, K. Kumagai, S. Kwon, K. Masuda, I. Moya, F. Scantamburlo, M. Sugimoto IFMIF/EVEDA PT, Aomori, Japan L. Antoniazzi, L. Bellan, M. Comunian, A. Facco, E. Fagotti, F. Grespan, A. Palmieri, A. Pisent INFN/LNL, Legnaro (PD), Italy F. Arranz, B. Brañas, J. Castellanos, D. Gavela, D. Jimenez-Rey, Á. Marchena, J. Mollá, P. Méndez, O. Nomen, C. Oliver, I. Podadera, D. Regidor, A. Ros, V. Villamayor, M. Weber, C. de la Morena CIEMAT, Madrid, Spain N. Bazin, B. Bolzon, N. Chauvin, S. Chel, J. Marroncle CEA-IRFU, Gif-sur-Yvette, France P. Cara, Y. Carin, F. Cismondi, G. Duglue, H. Dzitko, D. Gex, A. Jokinen, I. Moya, G. Phillips, F. Scantamburlo F4E, Germany A. Mizuno JASRI/SPring-8, Hyogo-ken, Japan Y. Shimosaki KEK, Ibaraki, Japan
	Construction and validation of the Linear IFMIF Prototype Accelerator (LIPAc) have been conducted under the framework of the IFMIF/EVEDA project. The LIPAc consists, in its final configuration, of a 100 keV injector and the world longest 5 MeV RFQ accelerator, followed by a MEBT with high space charged and beam loaded re-buncher cavities, an HWR-SRF linac, HEBT with a Diagnostic Plate, ending in a Beam Dump (BD) designed to stop the world highest deuteron current of 125 mA CW at 9 MeV. The beam commissioning at a low duty cycle of ~0.1 % led to a successful RFQ acceleration of 125 mA and 5 MeV beam in 2019. The following beam commissioning phase was initiated in July 2021 with a temporary transport line replacing the SRF linac. The major goals of this phase are to validate the RFQ, MEBT and BD performances up to CW and to characterize the beam properties in preparation to the final configuration with the SRF linac. This paper will present progresses made in this phase so far, such as a low-current and low-duty beam commissioning completed in Dec. 2021, CW operation campaign of the injector towards the nominal beam current, and RF conditioning of the RFQ towards CW.

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	Slides TU2AA04 [6.731 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TU2AA04
About •	Received ※ 27 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 02 September 2022 — Issue date ※ 08 September 2022
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TUPOGE19	Status of the New Intense Heavy Ion DTL Project Alvarez 2.0 at GSI	537
TUOPA04	use link to see paper's listing under its alternate paper code
	L. Groening, T. Dettinger, X. Du, M. Heilmann, M. Kaiser, E. Merz, S. Mickat, A. Rubin, C. Xiao GSI, Darmstadt, Germany
	The Alvarez-type post-stripper DTL at GSI accelerates intense ion beams with A/q <= 8.5 from 1.4 to 11.4 MeV/u. After more than 45 years of operation it suffers from aging and its design does not meet the requirements of the upcoming FAIR project. The design of a new 10⁸ MHz Alvarez-type DTL has been completed and series components for the 55 m long DTL are under production. In preparation, a first cavity section as First of Series has been operated at nominal RF-parameters. Additionally, a prototype drift tube with internal pulsed quadrupole has been built and operated at nominal parameters successfully. High quality of copper-plating of large components and add-on parts has been achieved within the ambitious specifications. This contribution summarizes the current project status of Alvarez 2.0 at GSI and sketches the future path to completion.
	Slides TUPOGE19 [1.197 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE19
About •	Received ※ 18 August 2022 — Revised ※ 30 August 2022 — Accepted ※ 08 September 2022 — Issue date ※ 15 September 2022
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FR1AA03	Status and Challenges at TRIUMF ISAC Facility	866
	Z.Y. Yao, Z.T. Ang, T. Au, K. Fong, X.L. Fu, J.J. Keir, P. Kolb, D. Lang, R.E. Laxdal, R. Leewe, Y. Ma, B. Matheson, R.S. Sekhon, B.S. Waraich, Q. Zheng, V. Zvyagintsev TRIUMF, Vancouver, Canada
	The ISAC facility uses the ISOL technique to produce radioactive ions for experiments. The post-accelerator consists of a room temperature linac (ISAC-I) and a su-perconducting linac (ISAC-II). After more than two dec-ades of beam delivery in ISAC, the RF systems have met various challenges regarding increased operation require-ments, system stability issues and performance improve-ments. This paper discusses the detailed challenges in recent years in both ISAC-I and ISAC-II. The upgrade plan or mitigation solution to address each challenge is reported respectively. A hint of the long-term vision at ISAC is also briefly described at the end of the paper.

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	Slides FR1AA03 [6.986 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-FR1AA03
About •	Received ※ 13 August 2022 — Revised ※ 21 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 01 September 2022
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Paper

Title

Page

Upgrades and Developments at the ISIS Linac

1

A.P. Letchford
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

The ISIS Spallation Neutron Source at the Rutherford Appleton Laboratory (RAL) in the UK has a 70 MeV H⁻ linac operating at 202.5 MHz. The linac consists of a 665 keV RFQ and a 4-tank Drift Tube Linac (DTL). In order to ensure continued reliability, increase performance and lay the groundwork for possible facility upgrades in the future a programme of R&D has been taking place in recent years. This paper will discuss three components of that programme: the complete replacement of DTL Tank 4; the design of a Medium Energy beam Transport (MEBT) between the RFQ and DTL; and the Front End Test Stand (FETS), a demonstrator for the front end of a future high current, high energy linac.

Slides MO1AA01 [26.001 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MO1AA01

About •

Received ※ 16 August 2022 — Revised ※ 25 August 2022 — Accepted ※ 27 August 2022 — Issue date ※ 27 September 2022

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MO1AA02

Completion of FRIB Beam Commissioning

T. Maruta
FRIB, East Lansing, Michigan, USA

Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DESC0000661
In April 2021, FRIB became the highest energy heavy-ion linac in the world with the acceleration of Kr-86 to 212 MeV/u using all 46 cryomodules containing 324 SC cavities. Also, three-charge state Xe-124 was accelerated to the same energy with the intensity increase by the factor of 2.5 compared to the single charge state. Many High-Level Physics Applications were developed and used during the commissioning, allowing quick beam commissioning progress. For the first time, the stripping with liquid Li film was tested with Ar, Xe, and U beams in the energy range 17 MeV/u to 20 MeV/u.

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Slides MO1AA02 [5.150 MB]

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MOPOPA15

Three Years of Operation of the SPIRAL2 SC LINAC- RF Feedback

98

M. Di Giacomo, M. Aburas, P.-E. Bernaudin, O. Delahaye, A. Dubosq, A. Ghribi, J.-M. Lagniel, J.F. Leyge, G. Normand, A.K. Orduz, F. Pillon, L. Valentin
GANIL, Caen, France
F. Bouly
LPSC, Grenoble Cedex, France
S. Sube
CEA-DRF-IRFU, France

The superconducting LINAC of SPIRAL2 at the GANIL facility has been in operation since October 2019. The accelerator uses 12 low beta and 14 high beta supercon-ducting quarter wave cavities, cooled at 4°K, working at 88 MHz. The cavities are operated at a nominal gradient of 6.5 MV/m and are independently powered by a LLRF and a solid-state amplifier, protected by a circulator. Pro-ton and deuteron beam currents can reach 5 mA and beam loading perturbation is particularly strong on the first cavities, as they are operated at field levels much lower than the nominal one. This paper presents a feedback after three years of oper-ation, focuses on the RF issues, describing problems and required improvement on the low level, control and pow-er systems

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA15

About •

Received ※ 14 August 2022 — Revised ※ 17 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 02 September 2022

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MOPOPA16

UNILAC Heavy Ion Beam Operation at FAIR Intensities

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

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Received ※ 19 August 2022 — Revised ※ 22 August 2022 — Accepted ※ 26 August 2022 — Issue date ※ 01 September 2022

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MOPOPA17

RF Commissioning of the First-of-Series Cavity Section of the Alvarez 2.0 at GSI

106

M. Heilmann, L. Groening, C. Herr, M. Hoerr, S. Mickat, B. Schlitt, G. Schreiber
GSI, Darmstadt, Germany

The existing post-stripper DTL of the GSI UNILAC will be replaced with the new Alvarez 2.0 DTL to serve as the injector chain for the Facility of Antiproton and Ion Research (FAIR). The 10⁸.4 MHz Alvarez 2.0 DTL with a total length of 55 meters has an input energy of 1.36 MeV/u and the output energy is 11.32 MeV/u. The presented First-of-Series (FoS) cavity section with 11 drift tubes and a total length of 1.9 m is the first part of the first cavity of the Alvarez 2.0 DTL. After copper plating and assembly of the cavity the RF-conditioning started in July 2021. These proceeding gives an overview on the results of the successfully RF-conditioning to reach the necessary gap voltage for uranium operation including a comfortable safety margin.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA17

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Received ※ 24 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 01 September 2022

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MOPOPA18

High Intensity Heavy Ion Beam Optimization at GSI UNILAC

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.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA18

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Received ※ 24 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 28 August 2022 — Issue date ※ 01 September 2022

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MOPOPA19

Preparation for Commissioning with Beam of "Advanced Demonstrator" Module with Heavy Ion Beam

114

M. Miski-Oglu, W.A. Barth, M. Basten, C. Burandt, F.D. Dziuba, T. Kürzeder, S. Lauber, J. List, S. Yaramyshev
HIM, Mainz, Germany
W.A. Barth, M. Basten, C. Burandt, F.D. Dziuba, V. Gettmann, T. Kürzeder, S. Lauber, J. List, S. Yaramyshev
GSI, Darmstadt, Germany
W.A. Barth, F.D. Dziuba, S. Lauber, J. List
KPH, Mainz, Germany
H. Podlech, M. Schwarz
IAP, Frankfurt am Main, Germany

The integration of the accelerator components in to the cryogenic module prototype (Advanced Demonstrator) is a major milestone of the R&D for the superconducting heavy ion continuous wave linear accelerator HELIAC at GSI. The HELIAC is joint project of Helmholtz Institute Mainz (HIM) and GSI developed in collaboration with IAP Goethe University Frankfurt. This module is equipped with three superconducting (sc) Cross bar H-mode (CH) acceleration cavities CH0-CH2 and a sc rebuncher cavity, as well as two sc solenoids. The commissioning of the cryogenic module with Argon beam at GSI is scheduled for August 2023. In preparation for the beam test activities, the beamline, which connects the High Charge State Injector (HLI) with the testing area, has been installed. The beamline comprises a pair of phase probes for Time Of Flight (TOF) measurement of the incoming beam energy, quadrupole lenses and a 4-gap RF-buncher cavity. The beam diagnostics bench behind the cryo module is equipped with phase probe pairs, a slit-grid device, a bunch shape monitor (Feshenko monitor) for measurements of the longitudinal beam profile. The bench allows complete 6d characterization of the ion beam.

Poster MOPOPA19 [3.074 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA19

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Received ※ 24 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 04 September 2022

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MOPOPA20

Q Drop Tendency of Half-Wave Resonator Cavity

118

Y. Jung, H. Jang, H. Kim, H. Kim, J.W. Kim
IBS, Daejeon, Republic of Korea
S. Jeon
Kyungpook National University, Daegu, Republic of Korea

All HWRs (half-wave resonator superconducting cavities) have been fabricated and installed in the low energy section of the LINAC in IBS. All HWR cavities have been tested (vertical tests, VT) both at 4.2 K and 2.1 K cryogenic surroundings although operating temperature of HWRs is 2.1 K. Good cavities of high quality factors showed the Q drop tendency of 2.1 k were very similar to that of 4.2 K. However, in many cases, Q drop tendency of 2.1 K were not similar with 4.2 K, rather Q decreased more rapidly than 4.2 K which means the surface resistance of the cavity rapidly increased at 2 K surrounding. In this study, we will report that various Q results of HWRs and compare their Q drop tendency as a function of temperature, 2.1 K and 4.2 K.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA20

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Received ※ 23 August 2022 — Revised ※ 28 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 01 September 2022

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MOPOPA21

RF Beam Sweeper for Purifying In-Flight Produced Rare Isotope Beams at ATLAS Facility

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.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA21

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Received ※ 14 August 2022 — Revised ※ 19 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 01 September 2022

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MOPOPA24

High-Brightness RFQ Injector for LANSCE Multi-Beam Operation

130

MOOPA06

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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.

Slides MOPOPA24 [3.266 MB]

Poster MOPOPA24 [5.806 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA24

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Received ※ 21 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 28 August 2022 — Issue date ※ 01 September 2022

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TU2AA02

SPIRAL2 Final Commissioning Results

314

A.K. Orduz, P.-E. Bernaudin, M. Di Giacomo, R. Ferdinand, B. Jacquot, O. Kamalou, J.-M. Lagniel, G. Normand, A. Savalle
GANIL, Caen, France
D.U. Uriot
CEA-DRF-IRFU, France

The commissioning of SPIRAL2 was carried out in different steps and slots from 2014 to end 2021. In a first phase, the proton-deuteron and heavy ion sources, LEBT lines and RFQ were commissioned and validated with A/Q=1 up to 3 particles. The validation of the MEBT (between the RFQ and the linac, including the Single Bunch Selector), linac and HEBT lines (up to the beam dump and to the NFS experimental room) started on July 2019, when GANIL received the authorization to operate SPIRAL2. The linac tuning is now validated with H⁺, 4He2+ and D⁺ and nominal H⁺ and D⁺ beams were sent to NFS for physics experiments. The main results obtained during the commissioning stages and the strategy used by the commissioning team are presented.

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Slides TU2AA02 [3.724 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TU2AA02

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Received ※ 24 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 02 September 2022

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TU2AA03

Status and Beam Commissioning of the RAON Superconducting Linac

M. Kwon
IBS, Daejeon, Republic of Korea

Installation of the low energy superconducting linac was completed by 2021 and first cool-down will be started soon followed by the beam commissioning. Status of the cool-down and the preparation of the beam commissioning will be presented and first result of the injector beam commissioing of the RAON heavy ion accelerator will be summarized.

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Slides TU2AA03 [9.494 MB]

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TU2AA04

Commissioning of IFMIF Prototype Accelerator Towards CW Operation

319

K. Masuda, T. Akagi, A. De Franco, T. Ebisawa, K. Hasegawa, K. Hirosawa, J. Hyun, T. Itagaki, A. Kasugai, K. Kondo, K. Kumagai, S. Kwon, A. Mizuno, Y. Shimosaki, M. Sugimoto
QST Rokkasho, Aomori, Japan
T. Akagi, Y. Carin, F. Cismondi, A. De Franco, D. Gex, K. Hirosawa, K. Kumagai, S. Kwon, K. Masuda, I. Moya, F. Scantamburlo, M. Sugimoto
IFMIF/EVEDA PT, Aomori, Japan
L. Antoniazzi, L. Bellan, M. Comunian, A. Facco, E. Fagotti, F. Grespan, A. Palmieri, A. Pisent
INFN/LNL, Legnaro (PD), Italy
F. Arranz, B. Brañas, J. Castellanos, D. Gavela, D. Jimenez-Rey, Á. Marchena, J. Mollá, P. Méndez, O. Nomen, C. Oliver, I. Podadera, D. Regidor, A. Ros, V. Villamayor, M. Weber, C. de la Morena
CIEMAT, Madrid, Spain
N. Bazin, B. Bolzon, N. Chauvin, S. Chel, J. Marroncle
CEA-IRFU, Gif-sur-Yvette, France
P. Cara, Y. Carin, F. Cismondi, G. Duglue, H. Dzitko, D. Gex, A. Jokinen, I. Moya, G. Phillips, F. Scantamburlo
F4E, Germany
A. Mizuno
JASRI/SPring-8, Hyogo-ken, Japan
Y. Shimosaki
KEK, Ibaraki, Japan

Construction and validation of the Linear IFMIF Prototype Accelerator (LIPAc) have been conducted under the framework of the IFMIF/EVEDA project. The LIPAc consists, in its final configuration, of a 100 keV injector and the world longest 5 MeV RFQ accelerator, followed by a MEBT with high space charged and beam loaded re-buncher cavities, an HWR-SRF linac, HEBT with a Diagnostic Plate, ending in a Beam Dump (BD) designed to stop the world highest deuteron current of 125 mA CW at 9 MeV. The beam commissioning at a low duty cycle of ~0.1 % led to a successful RFQ acceleration of 125 mA and 5 MeV beam in 2019. The following beam commissioning phase was initiated in July 2021 with a temporary transport line replacing the SRF linac. The major goals of this phase are to validate the RFQ, MEBT and BD performances up to CW and to characterize the beam properties in preparation to the final configuration with the SRF linac. This paper will present progresses made in this phase so far, such as a low-current and low-duty beam commissioning completed in Dec. 2021, CW operation campaign of the injector towards the nominal beam current, and RF conditioning of the RFQ towards CW.

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Slides TU2AA04 [6.731 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TU2AA04

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Received ※ 27 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 02 September 2022 — Issue date ※ 08 September 2022

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TUPOGE19

Status of the New Intense Heavy Ion DTL Project Alvarez 2.0 at GSI

537

TUOPA04

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L. Groening, T. Dettinger, X. Du, M. Heilmann, M. Kaiser, E. Merz, S. Mickat, A. Rubin, C. Xiao
GSI, Darmstadt, Germany

The Alvarez-type post-stripper DTL at GSI accelerates intense ion beams with A/q <= 8.5 from 1.4 to 11.4 MeV/u. After more than 45 years of operation it suffers from aging and its design does not meet the requirements of the upcoming FAIR project. The design of a new 10⁸ MHz Alvarez-type DTL has been completed and series components for the 55 m long DTL are under production. In preparation, a first cavity section as First of Series has been operated at nominal RF-parameters. Additionally, a prototype drift tube with internal pulsed quadrupole has been built and operated at nominal parameters successfully. High quality of copper-plating of large components and add-on parts has been achieved within the ambitious specifications. This contribution summarizes the current project status of Alvarez 2.0 at GSI and sketches the future path to completion.

Slides TUPOGE19 [1.197 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE19

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Received ※ 18 August 2022 — Revised ※ 30 August 2022 — Accepted ※ 08 September 2022 — Issue date ※ 15 September 2022

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FR1AA03

Status and Challenges at TRIUMF ISAC Facility

866

Z.Y. Yao, Z.T. Ang, T. Au, K. Fong, X.L. Fu, J.J. Keir, P. Kolb, D. Lang, R.E. Laxdal, R. Leewe, Y. Ma, B. Matheson, R.S. Sekhon, B.S. Waraich, Q. Zheng, V. Zvyagintsev
TRIUMF, Vancouver, Canada

The ISAC facility uses the ISOL technique to produce radioactive ions for experiments. The post-accelerator consists of a room temperature linac (ISAC-I) and a su-perconducting linac (ISAC-II). After more than two dec-ades of beam delivery in ISAC, the RF systems have met various challenges regarding increased operation require-ments, system stability issues and performance improve-ments. This paper discusses the detailed challenges in recent years in both ISAC-I and ISAC-II. The upgrade plan or mitigation solution to address each challenge is reported respectively. A hint of the long-term vision at ISAC is also briefly described at the end of the paper.

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Slides FR1AA03 [6.986 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-FR1AA03

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Received ※ 13 August 2022 — Revised ※ 21 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 01 September 2022

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