TUP —  Poster Session   (28-Jun-22   16:00—17:30)
Paper Title Page
TUP03 Bunch Merging and Compression: Recent Progress with RF and LLRF Systems for FAIR 67
  • D.E.M. Lens, R. Balß, H. Klingbeil, U. Laier, J.S. Schmidt, K.G. Thomin, T. Winnefeld, B. Zipfel
    GSI, Darmstadt, Germany
  • H. Klingbeil
    TEMF, TU Darmstadt, Darmstadt, Germany
  Besides the realization of several new RF systems for the new heavy-ion synchrotron SIS100 and the storage rings CR and HESR, the FAIR project also includes an upgrade of the RF systems of the existing accelerator rings such as SIS18. The SIS18 RF systems currently comprise two ferrite cavities, three broadband magnetic-alloy cavities and one bunch-compressor cavity. In addition, the LLRF system has been continuously upgraded over the past years towards the planned topology that will be implemented for all FAIR ring accelerators. One of the challenges for the SIS18 RF systems is the large RF frequency span between 400 kHz and 5.4 MHz. Although the SIS18 upgrade is still under progress, a major part of the functionality has already been successfully tested with beam in machine development experiments (MDE). This includes multi-harmonic operation such as dual-harmonic acceleration and further beam gymnastics manipulations such as bunch merging and bunch compression. Many of these features are already used in standard operation. In this contribution, the current status is illustrated and recent MDE results are presented that demonstrate the capabilities of the RF systems for FAIR.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP03  
About • Received ※ 21 June 2022 — Revised ※ 30 June 2022 — Accepted ※ 01 July 2022 — Issue date ※ 10 August 2022
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TUP04 New Method for Overcoming Dipole Effects of 4-Rod RFQs 72
  • S. Wunderlich, C. Zhang
    GSI, Darmstadt, Germany
  A new design of a 4-rod RFQ has been developed and simulated. In contrast to conventional designs, it uses asymmetrical stem geometry in the vertical-longitudinal plane. The effect on dipole fields for different geometrical parameters were examined and will be discussed.  
poster icon Poster TUP04 [0.300 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP04  
About • Received ※ 21 June 2022 — Revised ※ 19 July 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022
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TUP05 Prototype Room Temperature Quadrupole Chamber with Cryogenic Installations 75
  • S. Aumüller, L.H.J. Bozyk, P.J. Spiller
    GSI, Darmstadt, Germany
  • K. Blaum
    MPI-K, Heidelberg, Germany
  The synchrotron SIS100 at FAIR accelerator complex at the GSI Helmholtzzentrum will generate heavy ion beams of ultimate intensities. As medium charge states have to be used, the probability for charge exchange in collisions with residual gas particles of such ions is much lager than for higher charge states. In the last years, several measures have lowered the residual gas density to extreme high vacuum conditions. For example 55% of the circumference of SIS18 have already been coated with NEG, which provides high and distributed pumping speed. Nevertheless, this coating does not pump nobel and nobel-like components, which have very high ionization cross sections. A cryogenic environment at e.g. 50-80K provides a high pumping speed for all heavy residual gas particles. The only typical residual gas particle that cannot be pumped at this temperature is hydrogen. With the pumping speed of an additional NEG coating in these areas, the pumping will be optimized for all residual gas particles. The installation of cryogenic installations in the existing room temperature synchrotron SIS18 at GSI has been investigated. Measurements on a prototype chamber and simulations of SIS18 with cryogenic installations based on these measurements are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP05  
About • Received ※ 21 June 2022 — Revised ※ 30 June 2022 — Accepted ※ 01 July 2022 — Issue date ※ 10 August 2022
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TUP06 Cryogenic Surfaces in a Room Temperature SIS18 Ioncatcher 79
  • L.H.J. Bozyk, S. Aumüller, P.J. Spiller
    GSI, Darmstadt, Germany
  For FAIR operation, the existing heavy ion synchrotron SIS18 at GSI will be used as booster for the future SIS100. In order to reach the intensity goals, medium charge state heavy ions will be used. Unfortunately, such ions have very high ionization cross sections in collisions with residual gas particles, yielding in beam loss and a subsequent pressure rise via ion impact stimulated gas desorption. To reduce the desorption yield, room temperature ioncatcher have been installed, which provide low desorption surfaces. Simulations including cryogenic surfaces show, that their high sticking probability prevents the vacuum system from pressure built-ups during operation. Such, the operation with heavy ion beams can be stabilized at higher heavy ion intensities, than solely with room temperature surfaces. A prototype ioncatcher containing cryogenic surfaces has been developed and built. The surfaces are cooled by a commercial coldhead, which easily allows this system being integrated into the room temperature synchrotron. The development and first laboratory tests including fast pressure measurements of this system will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP06  
About • Received ※ 21 June 2022 — Accepted ※ 01 July 2022 — Issue date ※ 10 August 2022  
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TUP07 Efficient Heavy Ion Acceleration with High Brilliance 83
  • C. Zhang
    GSI, Darmstadt, Germany
  • H. Podlech
    IAP, Frankfurt am Main, Germany
  It is challenging to realize an efficient and brilliant RFQ for accelerating high current heavy ion beams, as space charge effects are most pronounced at the low energy end. Here ’efficient’ means an as short as pos-sible accelerating structure with minimum RF power consumption, while ’brilliant’ means high beam transmission and low emittance growth. Using the > 9 m long HSI RFQ accelerator, one of the longest RFQs in the world, as an example, a promising solution has been presented.  
poster icon Poster TUP07 [1.134 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP07  
About • Received ※ 21 June 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022  
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TUP08 RF Chopper for Prebunched Radioactive Ion Beams 87
  • A.J. Gonzalez, A.S. Plastun
    FRIB, East Lansing, Michigan, USA
  An RF chopper system is being designed for the Re-Accelerator (ReA) linac at the Facility for Rare Isotope Beams (FRIB) at Michigan State University (MSU). The chopper system is designed to clean out satellite bunches and produce a 16.1 MHz bunch structure, which allows for time-of-flight separation of the isotopes. The chopper system’s location in the beamline is between the ReA3 and ReA6 cryomodules. In ReA, the beam can be prebunched at the frequency of 16.1 MHz and accelerated in a 80.5 MHz RFQ, producing four satellite bunches for every one high-intensity bunch. The chopper system includes an RF deflector operating at 64.4 MHz, which is the beat frequency of 80.5 MHz and 16.1 MHz. The deflector deflects every bunch to spatially separate high-intensity and satellite bunches. The beam trajectory is biased by a constant magnetic field to ensure the high-intensity bunches do not experience any total deflection. The kicked bunches are low in intensity and will be sent to a beam dump, resulting in a clean 16.1 MHz beam structure injected into the ReA6 cryomodule.  
poster icon Poster TUP08 [0.437 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP08  
About • Received ※ 20 June 2022 — Revised ※ 30 June 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022
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TUP09 Tuning and RF Measurements of the LILAC RFQ 90
  • H. Podlech
    IAP, Frankfurt am Main, Germany
  • H. Höltermann, H. Hähnel, B. Koubek, U. Ratzinger
    BEVATECH, Frankfurt, Germany
  A new linac for the NICA ion collider is under con-struction for JINR at BEVATECH GmbH. As first cavity the 2.5 m long RFQ was manufactured. Within this length it accelerates particles with a mass to charge ratio up to three to an energy of 600 keV/u. The operation frequency is 162.5 MHz and the 4-Rod structure consists of 23 RF cells that need to be adjusted using tuning blocks in order to provide the required field distribution along the electrodes. The status of the manufacturing and the upcoming tuning process including the overall RF setup of the RFQ are summarized in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP09  
About • Received ※ 24 June 2022 — Revised ※ 27 June 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022
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TUP10 High Power Tests of a New 4-Rod RFQ with Focus on Thermal Stability 93
  • S.R. Wagner, D. Koser, H. Podlech
    IAP, Frankfurt am Main, Germany
  • M. Basten
    GSI, Darmstadt, Germany
  • M. Basten
    HIM, Mainz, Germany
  • H. Podlech
    HFHF, Frankfurt am Main, Germany
  Due to strong limitations regarding operational stability of the existing HLI-RFQ a new design and prototype were commissioned. Three main problems were observed at the existing RFQ: A strong thermal sensitivity, modulated reflected power, and insufficient stability of the contact springs connecting the stems with the tuning plates. Although the last problem was easily solved, the first two remained and greatly hindered operations. To resolve this issue and ensure stable injection into the HLI, a new RFQ-prototype, optimized in terms of vibration suppression and cooling efficiency, was designed at the Institute of Applied Physics (IAP) of Goethe University Frankfurt. To test the performance of this prototype, high power tests with more than 25 kW/m were performed at GSI. During those, it was possible to demonstrate operational stability in terms of thermal load and mechanical vibrations, calculating the thermal detuning, and proof the reliability of the proposed design.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP10  
About • Received ※ 21 June 2022 — Revised ※ 10 August 2022 — Accepted ※ 30 September 2022 — Issue date ※ 30 September 2022
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TUP11 Upgrade and Operation of the ATLAS Radiation Interlock System (ARIS) 96
  • B.R. Blomberg, B. Back, K.J. Bunnell, J.A. Clark, M.R. Hendricks, C.E. Peters, J. Reyna, G. Savard, D. Stanton, L. Weber
    ANL, Lemont, Illinois, USA
  Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357.
ATLAS (the Argonne Tandem Linac Accelerator Sys-tem) is a superconducting heavy ion accelerator which can accelerate nearly all stable, and some unstable, iso-topes between hydrogen and uranium. Prompt radiation fields from gamma and or neutron are typically below 1 rem/hr at 30 cm, but are permitted up to 300 rem/hr at 30 cm. The original ATLAS Radiation Interlock System (ARIS), hereafter referred to as ARIS 1.0 was installed 30 years ago. While it has been a functional critical safe-ty system, its age has exposed the facility to high risk of temporary shutdown due to failure of obsolete compo-nents. Topics discussed will be architecture, hardware improvements, functional improvements, and operation permitting personnel access to areas with low levels of radiation.
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP11  
About • Received ※ 30 June 2022 — Revised ※ 10 August 2022 — Accepted ※ 04 September 2022 — Issue date ※ 19 September 2022
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TUP14 Study of Injection Line of the Cyclotrons C70XP of Arronax 100
  • T. Durand, R. Bellamy, C. Castel, F. Haddad, C. Koumeir, F. Poirier, H. Trichet
    Cyclotron ARRONAX, Saint-Herblain, France
  • T. Adam, P.G. Graehling, M. Heine, C. Maazouzi, F.R. Osswald
    IPHC, Strasbourg Cedex 2, France
  • F. Haddad
    SUBATECH, Nantes, France
  Funding: Work supported by grants from the French National Agency for Research, Arronax-Plus n°ANR-11-EQPX-0004, IRON n°ANR-11-LABX-18-01 and Next n°ANR-16-IDE-0007 and PhD scholarship from the IN2P3/CNRS.
The cyclotron C70XP is an accelerator built for the production of non-conventional radionuclides for nuclear medicine, research in physics, radio-chemistry and biology. Its injection section has been designed for 4 types of ions (HH+, D-, He2+ & H), 3 types of ions reach the end of the beamline (H+, He2+ & D+) at the maximum energy of 70 MeV (H & He2+). It is important that regular and standard runs provide similar beam features with a good emittance quality. An investigation, focused on the beam in the injection, cover beam measurements and potential beam geometry constraints. The beam transverse characteristics in the injection line has been studied with an Allison-type emittance meter and a simple instrumented collimator installed inside the injection line *. With these 2 devices, it is scrutinized how the beam emittance evolves as a function of settings of the injection magnets and the source parameters **. Dependencies found between the emittance, beam hotspots and tunings are discussed, as well as the protection performed by the collimator. Future of this work with a potential collimator design is introduced.
*F.Poirier and al., ’The Injection and Chopper-Based System at Arronax C70XP Cyclotron’
**F. Poirier and al., ’Installation, Use and Follow-Up of an Emittance-Meter at the Arronax Cyclotron 70XP’
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP14  
About • Received ※ 21 June 2022 — Revised ※ 27 June 2022 — Accepted ※ 01 July 2022 — Issue date ※ 10 August 2022
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TUP16 Seven Decades of Science with Accelerators at IPHC 104
  • F.R. Osswald
    IPHC, Strasbourg Cedex 2, France
  The Institut Pluridisciplinaire Hubert Curien (IPHC) is a laboratory with solid foundations and perspectives to overcome future challenges. It is a component of the Centre National de Recherche Scientifique (CNRS) and the university of Strasbourg. It has been founded in 2006 after fusion of three local laboratories in the field of ecology/environment, chemistry and subatomic physics. The activities related with subatomic physics presents a rich history which goes back to the 40’s and is now evolving towards new challenges at the frontier of the innovation with the contribution of other sciences as biology, chemistry, medicine and radiotherapy. The paper will recover a number of past and current activities with emphasis on the link between research and technology.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP16  
About • Received ※ 13 June 2022 — Revised ※ 28 June 2022 — Accepted ※ 10 August 2022 — Issue date ※ 30 September 2022
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TUP17 Beam Dynamics and Space Charge Studies for the InnovaTron Cyclotron 108
  • G. D’Agostino, W.J.G.M. Kleeven
    IBA, Louvain-la-Neuve, Belgium
  At IBA a high-intensity compact self-extracting cyclotron is being studied. There is no dedicated extraction device but instead, a special shaping of the magnetic iron and the use of harmonic coils to create large turn-separation. Proton currents up to 5 mA are aimed for. This would open new ways for large-scale production of medical radioisotopes. The main features of the cyclotron are presented. A major variable of the beam simulations is the space charge effect in the cyclotron center. Using the SCALA-solver of Opera3D, we attempt to find the ion source plasma meniscus and the beam phase space and current extracted from it. With these properties known, we study the bunch formation and acceleration under high space charge condition with our in-house tracking code AOC. We also discuss a new tool that automatizes optimization of cyclotron settings for maximizing beam properties such as extraction efficiency.
*Work supported by the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 886190
poster icon Poster TUP17 [2.549 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP17  
About • Received ※ 28 June 2022 — Revised ※ 10 August 2022 — Accepted ※ 29 September 2022 — Issue date ※ 29 September 2022
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TUP19 First Tests of Model-Based Linac Phasing in ISAC-II 113
  • S. Kiy, R.A. Baartman, O.K. Kesterpresenter, O. Shelbaya
    TRIUMF, Vancouver, Canada
  As the e-linac and ARIEL facilities at TRIUMF progress, the impending complexity of operating three simultaneous rare ion beams (RIBs) approaches. To help prepare for this, a framework for the development of High Level Applications has been constucted, upon which multiple avenues for improvement towards model-based and automated tuning are being pursued. Along one of these avenues, the 40-cavity superconducting ISAC-II heavy ion linac has been studied and modelled in the envelope code transoptr. This has allowed for real-time integration through the on-axis fields, fitting focal strengths of solenoids to achieve desired beam waists, and calculation of necessary cavity phases to achieve a desired output energy for given input beam parameters. Initial tests have been completed, successfully phasing up to 37 cavities using the transoptr model and achieving a final output energy within 1% of the expected while maintaining nominal (>90%) transmission. A summary of the calibration of the model to the machine is given, followed by results of the phasing tests and an outlook towards future improvements.  
poster icon Poster TUP19 [0.355 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP19  
About • Received ※ 26 June 2022 — Revised ※ 01 July 2022 — Accepted ※ 10 August 2022 — Issue date ※ 29 September 2022
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