HIAT2022 - List of Keywords (cavity)

Paper	Title	Other Keywords	Page
MO3I1	Developments towards a Compact Carbon Ion Linac for Cancer Therapy	linac, proton, acceleration, rfq	14
	B. Mustapha, D.A. Meyer, A. Nassiri, Y. Yang ANL, Lemont, Illinois, USA R.B. Agustsson, A. Araujo, S.V. Kutsaev, A.Yu. Smirnov RadiaBeam, Los Angeles, California, USA
	Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357 and Office of High Energy Physics SBIR/STTR Award DE-SC0015717. Hadron therapy offers improved localization of the dose to the tumor and much improved sparing of healthy tissues, compared to traditional X-ray therapy. Combined proton/carbon therapy can achieve the most precise dose confinement to the tumor. Moreover, recent studies indicated that adding FLASH capability to such system may provide significant breakthrough in cancer treatment. The Advanced Compact Carbon Ion Linac (ACCIL) is a conceptual design for a compact ion linac based on high-gradient accelerating structures operating in the S-band frequency range. Thanks to this innovation, the footprint of this accelerator is only 45 m, while its capabilities are well beyond the current state of the art for hadron therapy machines and include: operation up to 1000 pulses per second, pulse to pulse energy variation to treat moving tumors in layer-by-layer regime. ACCIL is capable of accelerating all ions with mass-to-charge ratio A/q ~ 2 to a full energy of 450 MeV/u, and that includes protons, helium, carbon, oxygen and neon. With very short beam pulses of ~ 1 ’s and high instantaneous dose delivery, ACCIL is capable of delivering FLASH-like doses (>100 Gy/sec) for most ion species. In close collaboration between Argonne and Radiabeam, we have developed different design options and prototypes of the high-gradient structures needed for ACCIL. Following an overview of the ACCIL design and its capabilities, the most recent results from the high-gradient structure R&D and future plans will be presented and discussed.
	Slides MO3I1 [3.259 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-MO3I1
About •	Received ※ 27 June 2022 — Revised ※ 10 August 2022 — Accepted ※ 05 September 2022 — Issue date ※ 05 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MO4C3	Development, Fabrication and Testing of the RF-Kicker for the Acculinna-2 Fragment Separator	kicker, coupling, operation, experiment	37
	W. Beeckman, F. Forest, O. Tasset-Maye, E.J. Voisin SIGMAPHI S.A., Vannes, France A. Bechtold NTG Neue Technologien GmbH & Co KG, Gelnhausen, Germany A.S. Fomichev, A.V. Gorshkov, S.A. Krupko, G.M. Ter-Akopian JINR/FLNR, Moscow region, Russia
	The Acculinna-2 radioactive beam separator was designed and built between 2012 and 2014, then installed and tested by Sigmaphi in 2015 and in full operation since 2016 at the Flerov laboratory of JINR in Dubna. In order to achieve efficient separation of neutron-deficient species, an RF kicker was foreseen since the beginning of the project but was put on hold for many years. In 2016 Sigmaphi got a contract to study, build, install and test an RF kicker with a variable frequency ranging between 15 and 21 MHz and capable of producing 15kV/cm transverse electric fields in a 10 cm gap over a 1m long distance.# The presentation first recalls the rationale of an RF-kicker to separate neutron-deficient species. It then goes through the different steps of the study, initial choice of the cavity structure, first dimensioning from analytical formulas, finite elements computations and tuning methods envisioned, down to a final preliminary design.# A 1/10 scaled mock-up of this final shape was built and tested as a check before building the full-size cavity. The NTG company was then contracted to perform, in a joint collaboration with Sigmaphi, the final study, detailed design, construction and factory testing of the real cavity. The presentation highlights the fabrication and tests of both mock-up and real size cavities through a series of pictures.# The complete RF-kicker, with its power supply, control and pumping systems was installed on the Acculinna-2 beamline in June 2019. Because the U400M cyclotron was due to shut down by mid-2020, the Acculinna-2 team decided to use the separator to accumulate as much data as possible, to be processed during the 2 years closing time. A 1-week time window for kicker testing was only available in February 2020, a short but sufficient time lapse to successfully drive the cavity at full power and test it over a wide frequency range. Unfortunately, because of cyclotron closure, no beam tests have been performed so far. The latest availabl
	Slides MO4C3 [16.742 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-MO4C3
About •	Received ※ 26 June 2022 — Revised ※ 10 August 2022 — Accepted ※ 15 September 2022 — Issue date ※ 29 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TU1C4	A 3D Printed IH-Type Linac Structure - Proof-of-Concept for Additive Manufacturing of Linac RF Cavities	vacuum, linac, simulation, experiment	41
	H. Hähnel, A. Ateş, U. Ratzinger IAP, Frankfurt am Main, Germany
	Funding: This research was funded by BBMBF grant number 05P21RFRB2. Additive manufacturing ("AM" or "3D printing") has become a powerful tool for rapid prototyping and manufacturing of complex geometries. A 433 MHz IH-DTL cavity has been constructed to act as a proof of concept for additive manufacturing of linac components. In this case, the internal drift tube structure has been produced from 1.4404 stainless steel using 3D printing. We present the concept of the cavity as well as first results of vacuum testing and materials testing. Vacuum levels sufficient for linac operation have been reached with the AM linac structure.
	Slides TU1C4 [5.326 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TU1C4
About •	Received ※ 20 June 2022 — Revised ※ 30 June 2022 — Accepted ※ 10 August 2022 — Issue date ※ 20 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TU2I2	Development and Commissioning of the K500 Superconducting Heavy Ion Cyclotron	cyclotron, extraction, MMI, resonance	46
	S. Som, A. Bandyopadhyay, S. Bandyopadhyay, S. Bhattacharya, P. Bhattacharyya, T. Bhattacharyya, U. Bhunia, N. Chaddha, J. Debnath, M.K. Dey, A. Dutta Gupta, S. Ghosh, A. Mandal, P.Y. Nabhiraj, C. Nandi, Z.A. Naser, S. Pal, S. Pal, U. Panda, J. Pradhan, A. Roy, S. Saha, S. Seth, S.K. Thakur VECC, Kolkata, India
	Funding: Work supported by the DAE, Government of India. The K500 Superconducting Cyclotron (SCC) has been developed indigenously and commissioned at VECC. The three-phase Radio-Frequency (RF) system of SCC, consists of three half-wave cavities placed vertically 120 deg. apart. Each half-wave cavity has two quarter-wave cylindrical cavities tied together at the centre and symmetrically placed about median plane of the cyclotron. Each quarter-wave cavity is made up of a short circuited non-uniform coaxial transmission line (called "dee-stem") terminated by accelerating electrode (called "Dee"). The SCC, operating in the range 9 to 27 MHz, has amplitude and phase stability within 100 ppm and 0.1 deg. respectively. The overview of all the subsystems of the cyclotron along with low-level RF (LLRF), high and low power RF amplifiers, cavity analysis, absolute Dee voltage measurement using X-ray method, amplitude and phase control loops will be presented in the talk. The commissioning of the cyclotron with first harmonic Nitrogen⁴⁺ beam extracted at 252 MeV, while operating at 14 MHz RF frequency, along with the correction of first harmonic magnetic field error by repositioning the cryostat within 120 micron accuracy, will be discussed briefly.
	Slides TU2I2 [18.037 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TU2I2
About •	Received ※ 15 June 2022 — Revised ※ 27 June 2022 — Accepted ※ 10 August 2022 — Issue date ※ 05 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP03	Bunch Merging and Compression: Recent Progress with RF and LLRF Systems for FAIR	LLRF, controls, target, operation	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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP07	Efficient Heavy Ion Acceleration with High Brilliance	rfq, emittance, brilliance, operation	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 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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP08	RF Chopper for Prebunched Radioactive Ion Beams	cryomodule, simulation, rfq, dipole	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 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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP19	First Tests of Model-Based Linac Phasing in ISAC-II	linac, ISAC, controls, solenoid	113
	S. Kiy, R.A. Baartman, O.K. Kester, 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 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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH1C3	Automation of RF and Cryomodule Operation at FRIB	operation, controls, SRF, linac	136
	S. Zhao, E. Bernal, W. Chang, E. Daykin, E. Gutierrez, W. Hartung, S.H. Kim, S.R. Kunjir, T.L. Larter, D.G. Morris, J.T. Popielarski, H.T. Ren, T. Xu FRIB, East Lansing, Michigan, USA
	Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661. The Facility for Rare Isotope Beams (FRIB) has been commissioned, with rare isotopes first produced in December 2021 and first user experiments conducted in May 2022. The FRIB driver linear accelerator (linac) uses 6 room temperature cavities, 324 superconducting cavities, and 69 superconducting solenoids to accelerate ions to more than 200 MeV/nucleon. Because of the large scale, automation is essential for reliable linac operation with high availability. Automation measures implemented during linac commissioning include turn-on of the cavities and solenoids, turn-on and fast recovery for room temperature devices, and emergency shut down of linac devices. Additional automated tasks include conditioning of multipacting barriers in the cavities and calibration of the control valves for the pneumatic tuners. To ensure a smooth transition to operations, we are currently working on real-time health monitoring of the linac cryomodules, including critical signals such as X-ray levels, RF coupler temperatures, and cryogenic parameters. In this paper, we will describe our automation procedures, the implementation details, and the experience we gained.
	Slides TH1C3 [1.966 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TH1C3
About •	Received ※ 21 June 2022 — Revised ※ 25 July 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH1C4	Cavity Designs for the CH3 to CH11 and Bellow Tuner Investigation of the Superconducting Heavy Ion Accelerator HELIAC	SRF, heavy-ion, simulation, niobium	140
	T. Conrad, H. Podlech, M. Schwarz IAP, Frankfurt am Main, Germany K. Aulenbacher, W.A. Barth, F.D. Dziuba, T. Kürzeder, S. Lauber, J. List, M. Miski-Oglu HIM, Mainz, Germany K. Aulenbacher IKP, Mainz, Germany W.A. Barth, M. Basten, F.D. Dziuba, V. Gettmann, M. Heilmann, T. Kürzeder, S. Lauber, J. List, M. Miski-Oglu, A. Rubin, A. Schnase, S. Yaramyshev GSI, Darmstadt, Germany
	New CH-DTL cavities designs of the planned Helmholtz Linear Accelerator (HELIAC) are developed in collaboration of GSI, HIM and IAP Frankfurt. The in cw-mode operating linac with a final energy of 7.3 MeV/u, is intended for various experiments, in particular with heavy ions at energies close to the Coulomb barrier for research on SHE. Twelve sc CH cavities are foreseen, divided into four different cryostats each equipped with two dynamic bellow tuner. After successful beam tests with CH0, CH3 to CH11 were designed. Based on the experience gained so far, optimizations were made, which will lead to both an increase in performance in terms of reducing the peak fields limiting superconductivity and a reduction in manufacturing costs and time. In order to optimize manufacturing, attention was paid to design many parts of the cavity, such as lids, spokes, tuner and helium shell, with the same geometrical dimensions. In addition, a tuner test rig was developed, which will be used to investigate the mechanical properties of the bellow tuner. For this purpose, different simulations were made in order to realize conditions as close as possible to reality in the test rig.
	Slides TH1C4 [6.439 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TH1C4
About •	Received ※ 27 June 2022 — Revised ※ 19 July 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH3I1	A Novel CW RFQ for Exotic and Stable Beams	rfq, alignment, vacuum, emittance	156
	A. Palmieri, L. Bellan, M. Comunian, L. Ferrari, A. Pisent, C.R. Roncolato INFN/LNL, Legnaro (PD), Italy
	The SPES RFQ is designed in order to accelerate beams in CW with A/q ratios from 3 to 7 from the Charge Breeder through the MRMS and the selection and injection lines up to the MEBT (Medium Energy Beam Transport). The RFQ is composed of 6 modules about 1.2 m long each. Each module is basically composed of a Stainless Steel Tank and four OFE Copper Electrodes. A copper layer is plated on the tank inner surface and a spring joint between tank and electrode is used in order to seal the RF. In this contribution, the main design steps of the RFQ, the construction concepts and the results obtained for the first assembled modules are shown.
	Slides TH3I1 [7.615 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TH3I1
About •	Received ※ 20 June 2022 — Revised ※ 28 June 2022 — Accepted ※ 10 August 2022 — Issue date ※ 29 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH3C2	Alternating Phase Focusing Based IH DTL for Heavy Ion Application	focusing, heavy-ion, operation, linac	162
	S. Lauber, K. Aulenbacher, W.A. Barth, M. Basten, C. Burandt, F.D. Dziuba, P. Forck, V. Gettmann, T. Kürzeder, J. List, M. Miski-Oglu, A. Rubin, S. Yaramyshev GSI, Darmstadt, Germany K. Aulenbacher, W.A. Barth, M. Basten, C. Burandt, F.D. Dziuba, V. Gettmann, T. Kürzeder, S. Lauber, J. List, M. Miski-Oglu, S. Yaramyshev HIM, Mainz, Germany K. Aulenbacher, W.A. Barth, F.D. Dziuba, S. Lauber, J. List KPH, Mainz, Germany M. Droba, H. Podlech, M. Schwarz IAP, Frankfurt am Main, Germany H. Podlech HFHF, Frankfurt am Main, Germany
	The continuous wave (CW) operated HElmholtz LInear ACcelerator (HELIAC) is going to reach the next milestone with the commissioning of the superconducting (SC) Advanced Demonstrator cryomodule, comprising four SC Crossbar H-mode (CH) cavities and SC steerer magnets. In parallel with the commissioning of the SC main accelerator, the normal conducting injector consisting of an ECR ion source, a RFQ and two Interdigital H-mode (IH) cavities will be built based on an Alternating Phase Focusing (APF) beam dynamics scheme. Both IH cavities will provide a beam energy gain from 300 keV/u to 1400 keV/u with a maximum mass to charge ratio of 6, requiring only one external quadrupole triplet and beam steerer elements between them. The APF concept allows stable and effective beam transport with transverse and longitudinal focusing, enabling an efficient and compact design. Due to the stringent requirements of the APF concept on the voltage distribution and the CW operation, optimization of each cavity in terms of RF, mechanical and thermal properties is crucial for successful operation of the HELIAC injector. The current layout of the APF based and CW operated injector will be presented.
	Slides TH3C2 [1.603 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TH3C2
About •	Received ※ 21 June 2022 — Revised ※ 04 July 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FR1C3	Mode Analysis of Single Spoke Resonator Type-2 (SSR2) for RISP	SRF, superconductivity, resonance, niobium	174
	M.O. Hyun IBS, Daejeon, Republic of Korea
	Funding: This paper was supported by the Rare Isotope Science Project (RISP), which had been funded by the ministry of Science and ICT (MSIT) and National Research Foundation (NRF) of the Republic of Korea. Rare Isotope Science Project (RISP) in the Institute of Basic Science (IBS), Daejeon, South Korea, is developing the high-energy superconducting(SC) linac composed with two types of superconducting cavity, single spoke resonator type-1 (SSR1) and type-2 (SSR2). Both cavities have same frequency 325MHz, but different beta, 0.3 and 0.51 each. For operating SC cavity within the target frequency, all outer disturbances should be removed or avoided. As a view of mechanical vibration, comparably low frequency up to 20kHz always happens as a consequence of combination between outer disturbance and resonant frequency of SC cavity. In this paper, we will show the design layout of SSR2 and its specifications. And also the mechanical resonance analysis for both bare and dressed cavity will be analyzed with numerical analysis program.
	Slides FR1C3 [6.985 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-FR1C3
About •	Received ※ 20 June 2022 — Revised ※ 28 June 2022 — Accepted ※ 01 July 2022 — Issue date ※ 10 August 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MO3I1

Developments towards a Compact Carbon Ion Linac for Cancer Therapy

linac, proton, acceleration, rfq

14

B. Mustapha, D.A. Meyer, A. Nassiri, Y. Yang
ANL, Lemont, Illinois, USA
R.B. Agustsson, A. Araujo, S.V. Kutsaev, A.Yu. Smirnov
RadiaBeam, Los Angeles, California, USA

Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357 and Office of High Energy Physics SBIR/STTR Award DE-SC0015717.
Hadron therapy offers improved localization of the dose to the tumor and much improved sparing of healthy tissues, compared to traditional X-ray therapy. Combined proton/carbon therapy can achieve the most precise dose confinement to the tumor. Moreover, recent studies indicated that adding FLASH capability to such system may provide significant breakthrough in cancer treatment. The Advanced Compact Carbon Ion Linac (ACCIL) is a conceptual design for a compact ion linac based on high-gradient accelerating structures operating in the S-band frequency range. Thanks to this innovation, the footprint of this accelerator is only 45 m, while its capabilities are well beyond the current state of the art for hadron therapy machines and include: operation up to 1000 pulses per second, pulse to pulse energy variation to treat moving tumors in layer-by-layer regime. ACCIL is capable of accelerating all ions with mass-to-charge ratio A/q ~ 2 to a full energy of 450 MeV/u, and that includes protons, helium, carbon, oxygen and neon. With very short beam pulses of ~ 1 ’s and high instantaneous dose delivery, ACCIL is capable of delivering FLASH-like doses (>100 Gy/sec) for most ion species. In close collaboration between Argonne and Radiabeam, we have developed different design options and prototypes of the high-gradient structures needed for ACCIL. Following an overview of the ACCIL design and its capabilities, the most recent results from the high-gradient structure R&D and future plans will be presented and discussed.

Slides MO3I1 [3.259 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-MO3I1

About •

Received ※ 27 June 2022 — Revised ※ 10 August 2022 — Accepted ※ 05 September 2022 — Issue date ※ 05 September 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MO4C3

Development, Fabrication and Testing of the RF-Kicker for the Acculinna-2 Fragment Separator

kicker, coupling, operation, experiment

37

W. Beeckman, F. Forest, O. Tasset-Maye, E.J. Voisin
SIGMAPHI S.A., Vannes, France
A. Bechtold
NTG Neue Technologien GmbH & Co KG, Gelnhausen, Germany
A.S. Fomichev, A.V. Gorshkov, S.A. Krupko, G.M. Ter-Akopian
JINR/FLNR, Moscow region, Russia

The Acculinna-2 radioactive beam separator was designed and built between 2012 and 2014, then installed and tested by Sigmaphi in 2015 and in full operation since 2016 at the Flerov laboratory of JINR in Dubna. In order to achieve efficient separation of neutron-deficient species, an RF kicker was foreseen since the beginning of the project but was put on hold for many years. In 2016 Sigmaphi got a contract to study, build, install and test an RF kicker with a variable frequency ranging between 15 and 21 MHz and capable of producing 15kV/cm transverse electric fields in a 10 cm gap over a 1m long distance.# The presentation first recalls the rationale of an RF-kicker to separate neutron-deficient species. It then goes through the different steps of the study, initial choice of the cavity structure, first dimensioning from analytical formulas, finite elements computations and tuning methods envisioned, down to a final preliminary design.# A 1/10 scaled mock-up of this final shape was built and tested as a check before building the full-size cavity. The NTG company was then contracted to perform, in a joint collaboration with Sigmaphi, the final study, detailed design, construction and factory testing of the real cavity. The presentation highlights the fabrication and tests of both mock-up and real size cavities through a series of pictures.# The complete RF-kicker, with its power supply, control and pumping systems was installed on the Acculinna-2 beamline in June 2019. Because the U400M cyclotron was due to shut down by mid-2020, the Acculinna-2 team decided to use the separator to accumulate as much data as possible, to be processed during the 2 years closing time. A 1-week time window for kicker testing was only available in February 2020, a short but sufficient time lapse to successfully drive the cavity at full power and test it over a wide frequency range. Unfortunately, because of cyclotron closure, no beam tests have been performed so far. The latest availabl

Slides MO4C3 [16.742 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-MO4C3

About •

Received ※ 26 June 2022 — Revised ※ 10 August 2022 — Accepted ※ 15 September 2022 — Issue date ※ 29 September 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TU1C4

A 3D Printed IH-Type Linac Structure - Proof-of-Concept for Additive Manufacturing of Linac RF Cavities

vacuum, linac, simulation, experiment

41

H. Hähnel, A. Ateş, U. Ratzinger
IAP, Frankfurt am Main, Germany

Funding: This research was funded by BBMBF grant number 05P21RFRB2.
Additive manufacturing ("AM" or "3D printing") has become a powerful tool for rapid prototyping and manufacturing of complex geometries. A 433 MHz IH-DTL cavity has been constructed to act as a proof of concept for additive manufacturing of linac components. In this case, the internal drift tube structure has been produced from 1.4404 stainless steel using 3D printing. We present the concept of the cavity as well as first results of vacuum testing and materials testing. Vacuum levels sufficient for linac operation have been reached with the AM linac structure.

Slides TU1C4 [5.326 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TU1C4

About •

Received ※ 20 June 2022 — Revised ※ 30 June 2022 — Accepted ※ 10 August 2022 — Issue date ※ 20 September 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TU2I2

Development and Commissioning of the K500 Superconducting Heavy Ion Cyclotron

cyclotron, extraction, MMI, resonance

46

S. Som, A. Bandyopadhyay, S. Bandyopadhyay, S. Bhattacharya, P. Bhattacharyya, T. Bhattacharyya, U. Bhunia, N. Chaddha, J. Debnath, M.K. Dey, A. Dutta Gupta, S. Ghosh, A. Mandal, P.Y. Nabhiraj, C. Nandi, Z.A. Naser, S. Pal, S. Pal, U. Panda, J. Pradhan, A. Roy, S. Saha, S. Seth, S.K. Thakur
VECC, Kolkata, India

Funding: Work supported by the DAE, Government of India.
The K500 Superconducting Cyclotron (SCC) has been developed indigenously and commissioned at VECC. The three-phase Radio-Frequency (RF) system of SCC, consists of three half-wave cavities placed vertically 120 deg. apart. Each half-wave cavity has two quarter-wave cylindrical cavities tied together at the centre and symmetrically placed about median plane of the cyclotron. Each quarter-wave cavity is made up of a short circuited non-uniform coaxial transmission line (called "dee-stem") terminated by accelerating electrode (called "Dee"). The SCC, operating in the range 9 to 27 MHz, has amplitude and phase stability within 100 ppm and 0.1 deg. respectively. The overview of all the subsystems of the cyclotron along with low-level RF (LLRF), high and low power RF amplifiers, cavity analysis, absolute Dee voltage measurement using X-ray method, amplitude and phase control loops will be presented in the talk. The commissioning of the cyclotron with first harmonic Nitrogen⁴⁺ beam extracted at 252 MeV, while operating at 14 MHz RF frequency, along with the correction of first harmonic magnetic field error by repositioning the cryostat within 120 micron accuracy, will be discussed briefly.

Slides TU2I2 [18.037 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TU2I2

About •

Received ※ 15 June 2022 — Revised ※ 27 June 2022 — Accepted ※ 10 August 2022 — Issue date ※ 05 September 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP03

Bunch Merging and Compression: Recent Progress with RF and LLRF Systems for FAIR

LLRF, controls, target, operation

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

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP07

Efficient Heavy Ion Acceleration with High Brilliance

rfq, emittance, brilliance, operation

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 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

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP08

RF Chopper for Prebunched Radioactive Ion Beams

cryomodule, simulation, rfq, dipole

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 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

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP19

First Tests of Model-Based Linac Phasing in ISAC-II

linac, ISAC, controls, solenoid

113

S. Kiy, R.A. Baartman, O.K. Kester, 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 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

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH1C3

Automation of RF and Cryomodule Operation at FRIB

operation, controls, SRF, linac

136

S. Zhao, E. Bernal, W. Chang, E. Daykin, E. Gutierrez, W. Hartung, S.H. Kim, S.R. Kunjir, T.L. Larter, D.G. Morris, J.T. Popielarski, H.T. Ren, T. Xu
FRIB, East Lansing, Michigan, USA

Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661.
The Facility for Rare Isotope Beams (FRIB) has been commissioned, with rare isotopes first produced in December 2021 and first user experiments conducted in May 2022. The FRIB driver linear accelerator (linac) uses 6 room temperature cavities, 324 superconducting cavities, and 69 superconducting solenoids to accelerate ions to more than 200 MeV/nucleon. Because of the large scale, automation is essential for reliable linac operation with high availability. Automation measures implemented during linac commissioning include turn-on of the cavities and solenoids, turn-on and fast recovery for room temperature devices, and emergency shut down of linac devices. Additional automated tasks include conditioning of multipacting barriers in the cavities and calibration of the control valves for the pneumatic tuners. To ensure a smooth transition to operations, we are currently working on real-time health monitoring of the linac cryomodules, including critical signals such as X-ray levels, RF coupler temperatures, and cryogenic parameters. In this paper, we will describe our automation procedures, the implementation details, and the experience we gained.

Slides TH1C3 [1.966 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TH1C3

About •

Received ※ 21 June 2022 — Revised ※ 25 July 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH1C4

Cavity Designs for the CH3 to CH11 and Bellow Tuner Investigation of the Superconducting Heavy Ion Accelerator HELIAC

SRF, heavy-ion, simulation, niobium

140

T. Conrad, H. Podlech, M. Schwarz
IAP, Frankfurt am Main, Germany
K. Aulenbacher, W.A. Barth, F.D. Dziuba, T. Kürzeder, S. Lauber, J. List, M. Miski-Oglu
HIM, Mainz, Germany
K. Aulenbacher
IKP, Mainz, Germany
W.A. Barth, M. Basten, F.D. Dziuba, V. Gettmann, M. Heilmann, T. Kürzeder, S. Lauber, J. List, M. Miski-Oglu, A. Rubin, A. Schnase, S. Yaramyshev
GSI, Darmstadt, Germany

New CH-DTL cavities designs of the planned Helmholtz Linear Accelerator (HELIAC) are developed in collaboration of GSI, HIM and IAP Frankfurt. The in cw-mode operating linac with a final energy of 7.3 MeV/u, is intended for various experiments, in particular with heavy ions at energies close to the Coulomb barrier for research on SHE. Twelve sc CH cavities are foreseen, divided into four different cryostats each equipped with two dynamic bellow tuner. After successful beam tests with CH0, CH3 to CH11 were designed. Based on the experience gained so far, optimizations were made, which will lead to both an increase in performance in terms of reducing the peak fields limiting superconductivity and a reduction in manufacturing costs and time. In order to optimize manufacturing, attention was paid to design many parts of the cavity, such as lids, spokes, tuner and helium shell, with the same geometrical dimensions. In addition, a tuner test rig was developed, which will be used to investigate the mechanical properties of the bellow tuner. For this purpose, different simulations were made in order to realize conditions as close as possible to reality in the test rig.

Slides TH1C4 [6.439 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TH1C4

About •

Received ※ 27 June 2022 — Revised ※ 19 July 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH3I1

A Novel CW RFQ for Exotic and Stable Beams

rfq, alignment, vacuum, emittance

156

A. Palmieri, L. Bellan, M. Comunian, L. Ferrari, A. Pisent, C.R. Roncolato
INFN/LNL, Legnaro (PD), Italy

The SPES RFQ is designed in order to accelerate beams in CW with A/q ratios from 3 to 7 from the Charge Breeder through the MRMS and the selection and injection lines up to the MEBT (Medium Energy Beam Transport). The RFQ is composed of 6 modules about 1.2 m long each. Each module is basically composed of a Stainless Steel Tank and four OFE Copper Electrodes. A copper layer is plated on the tank inner surface and a spring joint between tank and electrode is used in order to seal the RF. In this contribution, the main design steps of the RFQ, the construction concepts and the results obtained for the first assembled modules are shown.

Slides TH3I1 [7.615 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TH3I1

About •

Received ※ 20 June 2022 — Revised ※ 28 June 2022 — Accepted ※ 10 August 2022 — Issue date ※ 29 September 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH3C2

Alternating Phase Focusing Based IH DTL for Heavy Ion Application

focusing, heavy-ion, operation, linac

162

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

The continuous wave (CW) operated HElmholtz LInear ACcelerator (HELIAC) is going to reach the next milestone with the commissioning of the superconducting (SC) Advanced Demonstrator cryomodule, comprising four SC Crossbar H-mode (CH) cavities and SC steerer magnets. In parallel with the commissioning of the SC main accelerator, the normal conducting injector consisting of an ECR ion source, a RFQ and two Interdigital H-mode (IH) cavities will be built based on an Alternating Phase Focusing (APF) beam dynamics scheme. Both IH cavities will provide a beam energy gain from 300 keV/u to 1400 keV/u with a maximum mass to charge ratio of 6, requiring only one external quadrupole triplet and beam steerer elements between them. The APF concept allows stable and effective beam transport with transverse and longitudinal focusing, enabling an efficient and compact design. Due to the stringent requirements of the APF concept on the voltage distribution and the CW operation, optimization of each cavity in terms of RF, mechanical and thermal properties is crucial for successful operation of the HELIAC injector. The current layout of the APF based and CW operated injector will be presented.

Slides TH3C2 [1.603 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TH3C2

About •

Received ※ 21 June 2022 — Revised ※ 04 July 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FR1C3

Mode Analysis of Single Spoke Resonator Type-2 (SSR2) for RISP

SRF, superconductivity, resonance, niobium

174

M.O. Hyun
IBS, Daejeon, Republic of Korea

Funding: This paper was supported by the Rare Isotope Science Project (RISP), which had been funded by the ministry of Science and ICT (MSIT) and National Research Foundation (NRF) of the Republic of Korea.
Rare Isotope Science Project (RISP) in the Institute of Basic Science (IBS), Daejeon, South Korea, is developing the high-energy superconducting(SC) linac composed with two types of superconducting cavity, single spoke resonator type-1 (SSR1) and type-2 (SSR2). Both cavities have same frequency 325MHz, but different beta, 0.3 and 0.51 each. For operating SC cavity within the target frequency, all outer disturbances should be removed or avoided. As a view of mechanical vibration, comparably low frequency up to 20kHz always happens as a consequence of combination between outer disturbance and resonant frequency of SC cavity. In this paper, we will show the design layout of SSR2 and its specifications. And also the mechanical resonance analysis for both bare and dressed cavity will be analyzed with numerical analysis program.

Slides FR1C3 [6.985 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-FR1C3

About •

Received ※ 20 June 2022 — Revised ※ 28 June 2022 — Accepted ※ 01 July 2022 — Issue date ※ 10 August 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)