Cyclotrons2019 - List of Keywords (cavity)

Paper	Title	Other Keywords	Page
MOB01	Recent Progress in RIKEN RI Beam Factory	cyclotron, ECR, acceleration, ion-source	12
	O. Kamigaito, T. Dantsuka, M. Fujimaki, N. Fukunishi, H. Hasebe, Y. Higurashi, E. Ikezawa, H. Imao, M. Kidera, M. Komiyama, K. Kumagai, T. Maie, T. Nagatomo, T. Nakagawa, M. Nakamura, T. Nishi, J. Ohnishi, H. Okuno, K. Ozeki, N. Sakamoto, K. Suda, A. Uchiyama, T. Watanabe, Y. Watanabe, K. Yamada RIKEN Nishina Center, Wako, Japan Y.M. Miyake RIKEN, Saitama, Japan
	Recent efforts at the RIKEN RI Beam Factory (RIBF) are aimed at increasing the beam intensity for very heavy ions such as xenon and uranium. This paper presents upgrade programs carried out over the past few years, including modifications of the RF cavities of the RIKEN Ring Cyclotron and improvements of the charge stripper. The current performance of the RIBF accelerators and future plans to further increase the beam intensity are also presented.
	Slides MOB01 [13.848 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOB01
About •	paper received ※ 13 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
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MOP001	Design and Commissioning of RF System for SC200 Cyclotron	cyclotron, controls, MMI, LLRF	21
	G. Chen, C. Chao, Y. Chen, K.Z. Ding, G. Liu, X.Y. Long, Z. Peng, Y. Song, C. Yu, X. Zhang, Y. Zhao ASIPP, Hefei, People’s Republic of China L. Calabretta, A.C. Caruso INFN/LNS, Catania, Italy O. Karamyshev JINR/DLNP, Dubna, Moscow region, Russia G.A. Karamysheva, G. Shirkov JINR, Dubna, Moscow Region, Russia
	The SC200 proton therapy superconducting cyclotron is currently under construction by ASIPP (Hefei, China) and JINR (Dubna, Russia). The radio frequency (RF) system which provides an accelerating electric field for the particles, has been designed and tested in a high-power commissioning. The RF system consists of RF cavity, Low-level RF control system, RF source, transmission network and so on. The main performances of RF cavity meet design and use requirements in the cold test. The RF cavity achieved with an unload Q factor of 5200 at the resonant frequency of 91.5 MHz, 60 kV (Center)~120 kV (Extraction) accelerating voltage and coupling state of S11 <-30 dB. The low-level RF (LLRF) system has been tested with an amplitude stability of <0.2% and a phase stability of <0.1 degree in the high-power commissioning. What is more, the cavity operated in a ~50 kW continuous wave state after 4 weeks RF conditioning. Some risks have exposed at higher power test, but related solutions and improvements have been developed. In future work, the target of RF system is effective operation under the overall assembly of cyclotron after further optimization and RF conditioning.
	Poster MOP001 [0.720 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP001
About •	paper received ※ 09 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
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MOP024	Development of a Replacement for the Long Radial Probe in the Ring Cyclotron	cyclotron, vacuum, plasma, simulation	86
	R. Dölling, G.G. Gamma, V. Ovinnikov, M. Rohrer, P. Rüttimann, R. Senn PSI, Villigen PSI, Switzerland
	The long radial probe in PSI’s Ring cyclotron delivers a radial pattern of all but the first few turns. In recent years, the measurement has been plagued by artefacts and mechanical problems. We report here on the development of a replacement, which should also provide a more flexible basis for extended measurement capabilities.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP024
About •	paper received ※ 20 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020
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MOP028	Design of 5.8 MHz RF Electrode for AMS Cyclotron	cyclotron, impedance, acceleration, tandem-accelerator	94
	D.H. Ha, J.-S. Chai, Kh.M. Gad, M. Ghergherehchi, H.S. Kim, J.C. Lee, H. Namgoong SKKU, Suwon, Republic of Korea
	Accelerator Mass Spectrometry (AMS) is a powerful method for separating isotopes, and electrostatic tandem accelerators are widely used for AMS. Sungkyunkwan University is developing AMS that can be used in a smaller space based on cyclotron. Unlike conventional cyclotrons used in PET or proton therapy, cyclotron-based AMS provides high turn number and high resolution. In this study, we proposed a cavity with a frequency of 5.8 MHz and an accelerating voltage of 300 V to accelerate the particles in the cyclotron. The proposed cavity was designed as an electrode and verified by CST Microwave studio.
	Poster MOP028 [1.078 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP028
About •	paper received ※ 15 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
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MOP030	RF measurement of SKKUCY-10 RF Cavity for Impedance Matching	coupling, impedance, cyclotron, beam-loading	100
	J.C. Lee, J.-S. Chai, Kh.M. Gad, M. Ghergherehchi, D.H. Ha, H.S. Kim, H. Namgoong SKKU, Suwon, Republic of Korea
	Funding: Radiation Technology R&D program through the National Research Foundation of Korea funded by the Ministry of Science, ICT & Future Planning through the National Research Foundation of Korea The 10 MeV cyclotron was designed for next version in Sungkyunkwan University, after the SKKUCY-9 had developed for medical application for PET. The RF cavity, which generates the electric field in cyclotron, was designed based on a half-wavelength resonator and optimized to improve the unloaded quality factor (Q₀). The design specifications of RF cavity were resonance frequency 83.2 MHz, Q₀ 5830 and Dee voltage 40 kV with geometrical values resonator length 560 mm, Dee angle 35° and Stem radius 16 mm. The RF cavity of the SKKUCY-10 was fabricated and installed inside the electromagnet, and RF characteristics were measured with a network analyzer. The RF coupling coefficient and characteristic impedance for desired condition were selected at 1.08 and 52 ’, respectively. The RF coupling coefficient and characteristic impedance were measured 0.8-1.2, 52-49 ’ according to temperature as 15-21°C. The power coupler was checked for optimization of RF coupling coefficient and characteristic impedance, and the results show good agreement with simulated and measured data.
	Poster MOP030 [1.665 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP030
About •	paper received ※ 15 September 2019 paper accepted ※ 23 June 2020 issue date ※ 20 June 2020
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MOP032	Control System in 10 MeV Cyclotron Based on IoT	controls, cyclotron, monitoring, network	106
	M. Mohamadian, H. Afarideh, S. Babaee, H. Pashaei, N. Salmani AUT, Tehran, Iran M. Ghergherehchi SKKU, Suwon, Republic of Korea
	The Internet of Things (IoT) is one of the new most advanced technologies in the world. One of the application of this technology is using it in places where remote control is preferred or it needs to control various processes at different times throughout the day. The cyclotron accelerator is one such system in which the start-up process until radio medicine production requires continuous monitoring and inspection. In this research, we have tried to use the internet of things technology in the process of cyclotron control system specially in fine tuning section.
	Poster MOP032 [0.936 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP032
About •	paper received ※ 14 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
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MOC03	Upgrade of the PSI Injector 2 Cyclotron	cyclotron, LLRF, operation, pick-up	123
	M. Schneider, J. Grillenberger PSI, Villigen PSI, Switzerland
	The high intensity proton accelerator facility at PSI is capable of providing beam currents of up to 2.4 mA at a kinetic energy of 590 MeV. PSI is following an upgrade plan to further increase the beam power and to further minimize proton losses. Up to now, this has mainly been achieved by the installation of high gradient copper resonators in the Ring cyclotron and the installation of more powerful RF-amplifiers. Currently, PSI follows a similar approach for the Injector 2 cyclotron providing 72 MeV protons for the injection into the 590 MeV Ring cyclotron. In order to increase the turn separation in the injector cyclotron which results in lower relative beam losses, the two 150 MHz resonators operated in accelerating mode are replaced with two 50 MHz Aluminum resonators providing higher acceleration voltage. This paper describes the status of the upgrade, i.e., the replacement of the first resonator and related hardware.
	Slides MOC03 [10.052 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOC03
About •	paper received ※ 13 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020
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TUB02	JINR PROJECTS of CYCLOTRON FOR PROTON THERAPY	cyclotron, proton, extraction, simulation	140
	O. Karamyshev, K. Bunyatov, S. Gurskiy, G.A. Karamysheva, D.P. Popov, G. Shirkov, S.G. Shirkov, V.L. Smirnov, S.B. Vorozhtsov JINR, Dubna, Moscow Region, Russia V. Malinin JINR/DLNP, Dubna, Moscow region, Russia
	Physical design of the compact superconducting cyclotron SC230 (91.5MHz) has been performed. The cyclotron can deliver up to 230 MeV beam for proton therapy and medico-biological research. As the cyclotron will have a relatively small magnet field, it is possible to use both superconducting and resistive coil. Besides a superconducting cyclotron we simulate design of the cyclotron with a conventional copper water-cooled coil. Such a solution allows us to achieve a lower price compared to superconducting options, but it becomes a bit heavier.
	Slides TUB02 [8.397 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUB02
About •	paper received ※ 15 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020
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TUP009	Cyclotron Cavity Pollution Recovery	cyclotron, multipactoring, vacuum, electron	169
	J. Dabin, B. Adant, P. Cailliau, K. Ellis, E. Forton, J. Mandrillon, T.S. Ponter, P. Verbruggen IBA, Louvain-la-Neuve, Belgium
	In a cyclotron, RF cavities are usually among the most reliable subsystems, provided minimal care and maintenance. Nevertheless, several parameters may affect cavity performance after several years of operation. To name a few typical causes of degradation are: decreasing vacuum quality, various gas loads or gas qualities triggering adverse effects, deposition of highly emissive material on the cavity due to overheating of components like pass-through connectors, accidental use of chemicals or not-suitable greases. The cavity status can be monitored but, in the worst cases, the RF tuning may become difficult and it is important to apply methods in order to recover a better cavity Q-factor. In this paper, cases of cavity pollution will be shown, their potential root causes discussed and some recovery methods described.
	Poster TUP009 [0.398 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP009
About •	paper received ※ 12 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020
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TUP024	Muon Cyclotron for Transmission Muon Microscope	cyclotron, acceleration, flattop, extraction	208
	T. Yamazaki, Y. Nagatani KEK, Tokai Branch, Tokai, Naka, Ibaraki, Japan T. Adachi, Y. Miyake KEK, Ibaraki, Japan A. Goto, J. Ohnishi RIKEN Nishina Center, Wako, Japan Y. Kumata, S. Kusuoka, T. Onda, H. Tsutsui SHI, Tokyo, Japan
	Funding: This work is supported by JSPS KAKENHI Grant Numbers JP17H06126 and JP19H05194. A transmission muon microscope is an unprecedented tool which enables its users to reconstruct 3D image of samples such as a living cell. Muons can gain penetrative power as their energy increase, though electrons above 1 MeV start to trigger electromagnetic showers and protons above 1 GeV cause nuclear reactions. Muons accelerated up to about 5 MeV are able to penetrate a living cell (~ 10 um), which is impossible with ultra-high voltage (1 MeV) electron microscopes. In order to accelerate muons, efficient acceleration is necessary because the lifetime of muons is only 2.2 us. In addition, it is important to accelerate muons without increasing their energy dispersion. A cyclotron with a flat-top acceleration system is the best suited for the transmission muon microscope and is being developed at the J-PARC muon facility (MUSE). In this poster, the transmission muon microscope project and the development of the muon cyclotron will be presented.
	Poster TUP024 [1.366 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP024
About •	paper received ※ 14 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020
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TUP029	A 15-Mev/nucleon Iso-Cyclotron for Security and Radioisotope Production	cyclotron, extraction, acceleration, injection	223
	C. Johnstone PAC, Batavia, Illinois, USA R.B. Agustsson, S. Boucher, S.V. Kutsaev, A.Yu. Smirnov RadiaBeam, Marina del Rey, California, USA R.C. Lanza MIT, Cambridge, Massachusetts, USA
	Funding: Work supported by US Dept of Energy under a Small Business Innovation Research Grant Cargo inspection systems exploit the broad bremsstrahlung spectrum from a 6-10 MeV, low-duty cycle electron accelerator which in the presence of significant backgrounds presents challenges in image and material identification. An alternative approach is to use ions which can excite nuclear states either directly, or through generation of secondary high-energy signature gammas produced from nuclear interactions in a target. RadiaBeam is designing a compact sector isocyclotron 1.25 m in radius, with high-gradient cavities to accelerate multi-ion species up to 15-20 MeV/u with large turn-to turn, centimeter-level separation for low-loss extraction without lossy foil stripping. A strong-focusing radial field profile will be optimized in a separated-sector format for control over machine tune simultaneous with isochronous orbist requirements for high-current (~0.5 milliamp) operation. Innovation in injection will be introduced to replace the high-loss central region. Non-security applications of the cyclotron include medical isotope production, ion radiobiology, as well as material science research and ion instrumentation development.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP029
About •	paper received ※ 19 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020
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TUP030	Reinforcement Learning Based RF Control System for Accelerator Mass Spectrometry	controls, cyclotron, resonance, network	227
	H.S. Kim, J.-S. Chai, Kh.M. Gad, M. Ghergherehchi, D.H. Ha, J.C. Lee, H. Namgoong SKKU, Suwon, Republic of Korea
	Funding: Radiation Technology R&D program through the National Research Foundation of Korea funded by the Ministry of Science, ICT & Future Planning through the National Research Foundation of Korea Accelerator Mass Spectrometry (AMS) is a powerful method for separating rare isotopes and electrostatic type tandem accelerators have been widely used. At SungKyunKwan University, we are developing a AMS that can be used in a small space with higher resolution based on cyclotron. In contrast to the cyclotron used in conventional PET or proton therapy, the cyclotron-based AMS is characterized by high turn number and low dee voltage for high resolution. It is designed to accelerate not only 14C but also 13C or 12C. The AMS cyclotron RF control model has nonlinear characteristics due to the variable beam loading effect due to the acceleration of various particles and injected sample amounts. In this work, we proposed an AMS control system based on reinforcement learning. The proposed reinforcement learning finds the target control value in response to the environment through the learning process. We have designed a reinforcement learning based controller with RF system as an environment and verified the reinforcement learning based controller designed through the modeled cavity.
	Poster TUP030 [0.527 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP030
About •	paper received ※ 14 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020
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TUP031	Design and Construction Progress of Cyclotron Based Proton Irradiation Facility for Space Science	cyclotron, proton, radiation, ion-source	230
	Y.L. Lv, S. An, T. Cui, T. Ge, B. Ji, X.L. Jia, S.L. Wang, T.J. Zhang CIAE, Beijing, People’s Republic of China
	The proton irradiation facility for space science research and application consists of a 50 MeV proton cyclotron, two beam lines and two radiation effect simulation experimental target station. The 50 MeV proton cyclotron (CYCIAE-50) is a compact negative hydrogen ion cyclotron with the proton beam energy from 30 MeV to 50 MeV, and the beam intensity is from 10 nA to 10 uA. The cyclotron is about 3.2 m in diameter, 3.5 m in total height and 80 tons in total weight. The diameter of the pole is 2000 mm, the outer diameter of the yoke is 3200 mm, and the height of magnet is 1500 mm. The cyclotron uses an external multi-cusp H⁻ ion source. Then the H⁻ beam is injected into the accelerating orbit by the spiral inflector. The cyclotron frequency is about 16 MHz. The RF system is a pair of λ/2 RF cavities driven by a 25 kW transmitter. The fourth harmonic accelerating frequency is about 65 MHz. The proton beam is extracted by a single movable stripping carbon foil with the stripping extraction efficiency of 99%. The 50 MeV cyclotron has now been designed in detail, and its main components, such as the main magnets and RF cavities, are being manufactured in the factories in China.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP031
About •	paper received ※ 15 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020
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TUP033	Concept of 15 Mev Cyclotron for Medical Isotopes Production	cyclotron, vacuum, proton, acceleration	233
	O. Karamyshev JINR, Dubna, Moscow Region, Russia
	The purpose of this article is to show the prospects of cyclotrons with resistive coils and prove that even in such a well-established field there is still room for innovation. The concept of a 15 MeV cyclotron accelerating HÂ¯ ions with a current of up to 1 mA is presented. The design features significantly lower weight and power consumption, compared to the majority of existing cyclotrons of the same energy.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP033
About •	paper received ※ 15 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020
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TUP037	Compact Cotangential Orbit Accelerator for Particle Therapy	extraction, kicker, septum, proton	245
	T. Hae, H. Hiramoto Hitachi Ltd., Hitachi Research Laboratory, Ibaraki-ken, Japan T. Aoki, C. Hori, Y. Nakashima, F. Noda, T. Seki Hitachi Ltd., Ibaraki-ken, Japan
	A new type accelerator is being developed for the next generation particle therapy system. This accelerator utilizes a weak focusing DC magnetic field and a frequency modulated RF acceleration. Since a superconducting magnet is applicable to the main magnet, the accelerator can be compact. The accelerator characteristically has cotangential orbits to form an orbit-concentrated region. A beam is extracted from the region by using a new extraction method with the trans-verse RF kicker, peeler and regenerator magnetic fields. In this method an extracted beam energy can be controlled by applied time of the acceleration RF voltage without using an energy selection system (ESS). Intensity and pulse width of the extracted beam can be controlled by a voltage and / or a frequency pattern of the RF kicker.
	Poster TUP037 [0.740 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP037
About •	paper received ※ 13 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020
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WEA02	The Developments of the RF System Related to the K-800 Superconducting Cyclotron Upgrade	cyclotron, extraction, acceleration, LLRF	262
	A.C. Caruso, L. Calabretta, G. Costa, G. Gallo, A. Longhitano, D. Rifuggiato, A. Spartà, G. Torrisi, E. Zappalà INFN/LNS, Catania, Italy
	The K-800 superconducting cyclotron has been in operation at Laboratori Nazionali del Sud for almost 25 years. It has been subjected to continuous upgrades and modifications since 1994: the RF couplers have been redesigned, the new dees have been changed from aluminium to copper, as has the new central region from radial to axial injection of the beam, the hybrid configuration solid state - tube of the power amplifiers, the digital LLRF, etc. The next scheduled important upgrade of the Cyclotron mainly consists in a new extraction beam line able to support the increase of the beam current intensity. The accelerated beam will be extracted in two ways: by stripper and by electrostatic deflector and, consequently, one of the most important features of the new upgrade is the new cryostat. Further upgrades and refurbishments of the other main parts of the cyclotron, such as a new liner, the modification of the RF cavities and dees, the refurbishment of HLRF-LLRF, the insertion of the stripper extraction system, to name but a few, are in progress, too. This work focuses on the RF system upgrade.
	Slides WEA02 [10.816 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-WEA02
About •	paper received ※ 15 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020
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THB01	Review of High Power Cyclotrons and Their Applications	cyclotron, proton, experiment, acceleration	289
	L. Calabretta, D. Rifuggiato INFN/LNS, Catania, Italy M. Maggiore INFN/LNL, Legnaro (PD), Italy
	An incomplete review of existing machines and of present new projects of high power cyclotrons is here presented. Both high energy and low/medium energy cyclotrons will be described. Specific requests for different fields of applications are also discussed.
	Slides THB01 [11.837 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-THB01
About •	paper received ※ 15 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020
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FRA01	A New Solution for Cost Effective, High Average Power (2 GeV, 6 MW) Proton Accelerator and its R&D Activities	FFAG, resonance, cyclotron, proton	334
	T.J. Zhang, S. An, T.J. Bian, F.P. Guan, M. Li, S. Pei, C. Wang, F. Wang, Z.G. Yin CIAE, Beijing, People’s Republic of China
	The 100 MeV compact cyclotron, CYCIAE-100 was approved to start the construction in 2011, and the first proton beam was extracted on July 4, 2014. In 2017, the 200 µA proton beam development was conducted, and in 2018, the production of high power beam from 20 kW to 52 kW had been delivered successfully to the beam dump. Due to the successful construction of 435 tons magnet for CYCIAE-100, it has been proved that the gradient adjustment of magnetic field along radius can effectively enhance the vertical focusing during the isochronous acceleration. This key technology was applied to the general design of a 2 GeV CW proton accelerator, the energy limitation of the isochronous machine is increased from ~1 GeV to 2 GeV, by our contribution of the beam dynamics study for high energy isochronous FFAG. This paper will introduce CIAE’s engineering experience of precision magnet, high power RF systems, and the advantages of beam dynamics simulation based on large-scale parallel computing. The cost-effective solution for such a 2 GeV high power circular accelerator complex will be presented in detail after the brief introduction about the high power proton beam production by the CYCIAE-100.
	Slides FRA01 [19.669 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-FRA01
About •	paper received ※ 15 September 2019 paper accepted ※ 23 June 2020 issue date ※ 20 June 2020
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FRA02	Current Status of Sumitomo’s Superconducting Cyclotron Development for Proton Therapy	cyclotron, extraction, proton, ion-source	340
	H. Tsutsui, Y. Arakawa, Y. Ebara, A. Hashimoto, M. Hirabayashi, T. Hirayama, N. Kamiguchi, J. Kanakura, Y. Kumata, Y. Mikami, H. Mitsubori, T. Miyashita, T. Morie, H. Murata, H. Oda, H. Ookubo, T. Sakemi, M. Sano, T. Tachikawa, T. Takahashi, K. Taki, T. Tsurudome, T. Watanabe, J.Y. Yoshida SHI, Tokyo, Japan
	Sumitomo Heavy Industries, Ltd. is developing a com-pact superconducting isochronous 230 MeV cyclotron for proton therapy. It is designed to produce 1000 nA proton beams for high dose rate cancer treatment. The cyclotron magnet, which includes a liquid-helium-free cryostat, has been fabricated and the magnetic field has been measured. Magnetic field distribution and pa-rameters such as horizontal and vertical tunes agreed well with the original design. A 120 kW solid-state RF system is being tested. Other components such as the ion source and electrostatic deflector are being fabricated. After the testing of individual components, they will be assembled and beam testing will be scheduled at a new test site.
	Slides FRA02 [8.556 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-FRA02
About •	paper received ※ 13 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020
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FRB03	3D Radio Frequency Simulation of the INFN-LNS Superconducting Cyclotron	cyclotron, simulation, experiment, extraction	361
	G. Torrisi, L. Allegra, L. Calabretta, A.C. Caruso, G. Costa, G. Gallo, A. Longhitano, L. Neri, D. Rifuggiato INFN/LNS, Catania, Italy
	An upgrade plan of the Superconducting Cyclotron operating at INFN-LNS is ongoing. In this paper, a 3D numerical model of the Cyclotron radio frequency cavity is presented. Simulations include the coaxial sliding shorts, liner vacuum chamber, coupler, trimming capacitor and the Dees structures. CST microwave studio software has been used for numerical computation. RF simulations are mandatory also in order to analyze the field in the beam region and evaluate the impact of different Dees geometry and eventual field asymmetries. Moreover, 3D COMSOL Multiphysics simulations have been carried out in order to couple the electromagnetic field solution to a custom beam-dynamics code developed in Matlab as a future plan. Time evolution of accelerated beam and electromagnetic field make also possible to verify the magnetic field synchronization. Experimental validation of the developed model will be also presented.
	Slides FRB03 [19.931 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-FRB03
About •	paper received ※ 15 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020
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Paper

Title

Other Keywords

Page

MOB01

Recent Progress in RIKEN RI Beam Factory

cyclotron, ECR, acceleration, ion-source

12

O. Kamigaito, T. Dantsuka, M. Fujimaki, N. Fukunishi, H. Hasebe, Y. Higurashi, E. Ikezawa, H. Imao, M. Kidera, M. Komiyama, K. Kumagai, T. Maie, T. Nagatomo, T. Nakagawa, M. Nakamura, T. Nishi, J. Ohnishi, H. Okuno, K. Ozeki, N. Sakamoto, K. Suda, A. Uchiyama, T. Watanabe, Y. Watanabe, K. Yamada
RIKEN Nishina Center, Wako, Japan
Y.M. Miyake
RIKEN, Saitama, Japan

Recent efforts at the RIKEN RI Beam Factory (RIBF) are aimed at increasing the beam intensity for very heavy ions such as xenon and uranium. This paper presents upgrade programs carried out over the past few years, including modifications of the RF cavities of the RIKEN Ring Cyclotron and improvements of the charge stripper. The current performance of the RIBF accelerators and future plans to further increase the beam intensity are also presented.

Slides MOB01 [13.848 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOB01

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paper received ※ 13 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020

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MOP001

Design and Commissioning of RF System for SC200 Cyclotron

cyclotron, controls, MMI, LLRF

21

G. Chen, C. Chao, Y. Chen, K.Z. Ding, G. Liu, X.Y. Long, Z. Peng, Y. Song, C. Yu, X. Zhang, Y. Zhao
ASIPP, Hefei, People’s Republic of China
L. Calabretta, A.C. Caruso
INFN/LNS, Catania, Italy
O. Karamyshev
JINR/DLNP, Dubna, Moscow region, Russia
G.A. Karamysheva, G. Shirkov
JINR, Dubna, Moscow Region, Russia

The SC200 proton therapy superconducting cyclotron is currently under construction by ASIPP (Hefei, China) and JINR (Dubna, Russia). The radio frequency (RF) system which provides an accelerating electric field for the particles, has been designed and tested in a high-power commissioning. The RF system consists of RF cavity, Low-level RF control system, RF source, transmission network and so on. The main performances of RF cavity meet design and use requirements in the cold test. The RF cavity achieved with an unload Q factor of 5200 at the resonant frequency of 91.5 MHz, 60 kV (Center)~120 kV (Extraction) accelerating voltage and coupling state of S11 <-30 dB. The low-level RF (LLRF) system has been tested with an amplitude stability of <0.2% and a phase stability of <0.1 degree in the high-power commissioning. What is more, the cavity operated in a ~50 kW continuous wave state after 4 weeks RF conditioning. Some risks have exposed at higher power test, but related solutions and improvements have been developed. In future work, the target of RF system is effective operation under the overall assembly of cyclotron after further optimization and RF conditioning.

Poster MOP001 [0.720 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP001

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paper received ※ 09 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020

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MOP024

Development of a Replacement for the Long Radial Probe in the Ring Cyclotron

cyclotron, vacuum, plasma, simulation

86

R. Dölling, G.G. Gamma, V. Ovinnikov, M. Rohrer, P. Rüttimann, R. Senn
PSI, Villigen PSI, Switzerland

The long radial probe in PSI’s Ring cyclotron delivers a radial pattern of all but the first few turns. In recent years, the measurement has been plagued by artefacts and mechanical problems. We report here on the development of a replacement, which should also provide a more flexible basis for extended measurement capabilities.

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP024

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paper received ※ 20 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020

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MOP028

Design of 5.8 MHz RF Electrode for AMS Cyclotron

cyclotron, impedance, acceleration, tandem-accelerator

94

D.H. Ha, J.-S. Chai, Kh.M. Gad, M. Ghergherehchi, H.S. Kim, J.C. Lee, H. Namgoong
SKKU, Suwon, Republic of Korea

Accelerator Mass Spectrometry (AMS) is a powerful method for separating isotopes, and electrostatic tandem accelerators are widely used for AMS. Sungkyunkwan University is developing AMS that can be used in a smaller space based on cyclotron. Unlike conventional cyclotrons used in PET or proton therapy, cyclotron-based AMS provides high turn number and high resolution. In this study, we proposed a cavity with a frequency of 5.8 MHz and an accelerating voltage of 300 V to accelerate the particles in the cyclotron. The proposed cavity was designed as an electrode and verified by CST Microwave studio.

Poster MOP028 [1.078 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP028

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paper received ※ 15 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020

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MOP030

RF measurement of SKKUCY-10 RF Cavity for Impedance Matching

coupling, impedance, cyclotron, beam-loading

100

J.C. Lee, J.-S. Chai, Kh.M. Gad, M. Ghergherehchi, D.H. Ha, H.S. Kim, H. Namgoong
SKKU, Suwon, Republic of Korea

Funding: Radiation Technology R&D program through the National Research Foundation of Korea funded by the Ministry of Science, ICT & Future Planning through the National Research Foundation of Korea
The 10 MeV cyclotron was designed for next version in Sungkyunkwan University, after the SKKUCY-9 had developed for medical application for PET. The RF cavity, which generates the electric field in cyclotron, was designed based on a half-wavelength resonator and optimized to improve the unloaded quality factor (Q₀). The design specifications of RF cavity were resonance frequency 83.2 MHz, Q₀ 5830 and Dee voltage 40 kV with geometrical values resonator length 560 mm, Dee angle 35° and Stem radius 16 mm. The RF cavity of the SKKUCY-10 was fabricated and installed inside the electromagnet, and RF characteristics were measured with a network analyzer. The RF coupling coefficient and characteristic impedance for desired condition were selected at 1.08 and 52 ’, respectively. The RF coupling coefficient and characteristic impedance were measured 0.8-1.2, 52-49 ’ according to temperature as 15-21°C. The power coupler was checked for optimization of RF coupling coefficient and characteristic impedance, and the results show good agreement with simulated and measured data.

Poster MOP030 [1.665 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP030

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paper received ※ 15 September 2019 paper accepted ※ 23 June 2020 issue date ※ 20 June 2020

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MOP032

Control System in 10 MeV Cyclotron Based on IoT

controls, cyclotron, monitoring, network

106

M. Mohamadian, H. Afarideh, S. Babaee, H. Pashaei, N. Salmani
AUT, Tehran, Iran
M. Ghergherehchi
SKKU, Suwon, Republic of Korea

The Internet of Things (IoT) is one of the new most advanced technologies in the world. One of the application of this technology is using it in places where remote control is preferred or it needs to control various processes at different times throughout the day. The cyclotron accelerator is one such system in which the start-up process until radio medicine production requires continuous monitoring and inspection. In this research, we have tried to use the internet of things technology in the process of cyclotron control system specially in fine tuning section.

Poster MOP032 [0.936 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP032

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paper received ※ 14 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020

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MOC03

Upgrade of the PSI Injector 2 Cyclotron

cyclotron, LLRF, operation, pick-up

123

M. Schneider, J. Grillenberger
PSI, Villigen PSI, Switzerland

The high intensity proton accelerator facility at PSI is capable of providing beam currents of up to 2.4 mA at a kinetic energy of 590 MeV. PSI is following an upgrade plan to further increase the beam power and to further minimize proton losses. Up to now, this has mainly been achieved by the installation of high gradient copper resonators in the Ring cyclotron and the installation of more powerful RF-amplifiers. Currently, PSI follows a similar approach for the Injector 2 cyclotron providing 72 MeV protons for the injection into the 590 MeV Ring cyclotron. In order to increase the turn separation in the injector cyclotron which results in lower relative beam losses, the two 150 MHz resonators operated in accelerating mode are replaced with two 50 MHz Aluminum resonators providing higher acceleration voltage. This paper describes the status of the upgrade, i.e., the replacement of the first resonator and related hardware.

Slides MOC03 [10.052 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOC03

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paper received ※ 13 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020

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TUB02

JINR PROJECTS of CYCLOTRON FOR PROTON THERAPY

cyclotron, proton, extraction, simulation

140

O. Karamyshev, K. Bunyatov, S. Gurskiy, G.A. Karamysheva, D.P. Popov, G. Shirkov, S.G. Shirkov, V.L. Smirnov, S.B. Vorozhtsov
JINR, Dubna, Moscow Region, Russia
V. Malinin
JINR/DLNP, Dubna, Moscow region, Russia

Physical design of the compact superconducting cyclotron SC230 (91.5MHz) has been performed. The cyclotron can deliver up to 230 MeV beam for proton therapy and medico-biological research. As the cyclotron will have a relatively small magnet field, it is possible to use both superconducting and resistive coil. Besides a superconducting cyclotron we simulate design of the cyclotron with a conventional copper water-cooled coil. Such a solution allows us to achieve a lower price compared to superconducting options, but it becomes a bit heavier.

Slides TUB02 [8.397 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUB02

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paper received ※ 15 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020

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TUP009

Cyclotron Cavity Pollution Recovery

cyclotron, multipactoring, vacuum, electron

169

J. Dabin, B. Adant, P. Cailliau, K. Ellis, E. Forton, J. Mandrillon, T.S. Ponter, P. Verbruggen
IBA, Louvain-la-Neuve, Belgium

In a cyclotron, RF cavities are usually among the most reliable subsystems, provided minimal care and maintenance. Nevertheless, several parameters may affect cavity performance after several years of operation. To name a few typical causes of degradation are: decreasing vacuum quality, various gas loads or gas qualities triggering adverse effects, deposition of highly emissive material on the cavity due to overheating of components like pass-through connectors, accidental use of chemicals or not-suitable greases. The cavity status can be monitored but, in the worst cases, the RF tuning may become difficult and it is important to apply methods in order to recover a better cavity Q-factor. In this paper, cases of cavity pollution will be shown, their potential root causes discussed and some recovery methods described.

Poster TUP009 [0.398 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP009

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paper received ※ 12 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020

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TUP024

Muon Cyclotron for Transmission Muon Microscope

cyclotron, acceleration, flattop, extraction

208

T. Yamazaki, Y. Nagatani
KEK, Tokai Branch, Tokai, Naka, Ibaraki, Japan
T. Adachi, Y. Miyake
KEK, Ibaraki, Japan
A. Goto, J. Ohnishi
RIKEN Nishina Center, Wako, Japan
Y. Kumata, S. Kusuoka, T. Onda, H. Tsutsui
SHI, Tokyo, Japan

Funding: This work is supported by JSPS KAKENHI Grant Numbers JP17H06126 and JP19H05194.
A transmission muon microscope is an unprecedented tool which enables its users to reconstruct 3D image of samples such as a living cell. Muons can gain penetrative power as their energy increase, though electrons above 1 MeV start to trigger electromagnetic showers and protons above 1 GeV cause nuclear reactions. Muons accelerated up to about 5 MeV are able to penetrate a living cell (~ 10 um), which is impossible with ultra-high voltage (1 MeV) electron microscopes. In order to accelerate muons, efficient acceleration is necessary because the lifetime of muons is only 2.2 us. In addition, it is important to accelerate muons without increasing their energy dispersion. A cyclotron with a flat-top acceleration system is the best suited for the transmission muon microscope and is being developed at the J-PARC muon facility (MUSE). In this poster, the transmission muon microscope project and the development of the muon cyclotron will be presented.

Poster TUP024 [1.366 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP024

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paper received ※ 14 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020

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TUP029

A 15-Mev/nucleon Iso-Cyclotron for Security and Radioisotope Production

cyclotron, extraction, acceleration, injection

223

C. Johnstone
PAC, Batavia, Illinois, USA
R.B. Agustsson, S. Boucher, S.V. Kutsaev, A.Yu. Smirnov
RadiaBeam, Marina del Rey, California, USA
R.C. Lanza
MIT, Cambridge, Massachusetts, USA

Funding: Work supported by US Dept of Energy under a Small Business Innovation Research Grant
Cargo inspection systems exploit the broad bremsstrahlung spectrum from a 6-10 MeV, low-duty cycle electron accelerator which in the presence of significant backgrounds presents challenges in image and material identification. An alternative approach is to use ions which can excite nuclear states either directly, or through generation of secondary high-energy signature gammas produced from nuclear interactions in a target. RadiaBeam is designing a compact sector isocyclotron 1.25 m in radius, with high-gradient cavities to accelerate multi-ion species up to 15-20 MeV/u with large turn-to turn, centimeter-level separation for low-loss extraction without lossy foil stripping. A strong-focusing radial field profile will be optimized in a separated-sector format for control over machine tune simultaneous with isochronous orbist requirements for high-current (~0.5 milliamp) operation. Innovation in injection will be introduced to replace the high-loss central region. Non-security applications of the cyclotron include medical isotope production, ion radiobiology, as well as material science research and ion instrumentation development.

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP029

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paper received ※ 19 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020

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TUP030

Reinforcement Learning Based RF Control System for Accelerator Mass Spectrometry

controls, cyclotron, resonance, network

227

H.S. Kim, J.-S. Chai, Kh.M. Gad, M. Ghergherehchi, D.H. Ha, J.C. Lee, H. Namgoong
SKKU, Suwon, Republic of Korea

Funding: Radiation Technology R&D program through the National Research Foundation of Korea funded by the Ministry of Science, ICT & Future Planning through the National Research Foundation of Korea
Accelerator Mass Spectrometry (AMS) is a powerful method for separating rare isotopes and electrostatic type tandem accelerators have been widely used. At SungKyunKwan University, we are developing a AMS that can be used in a small space with higher resolution based on cyclotron. In contrast to the cyclotron used in conventional PET or proton therapy, the cyclotron-based AMS is characterized by high turn number and low dee voltage for high resolution. It is designed to accelerate not only 14C but also 13C or 12C. The AMS cyclotron RF control model has nonlinear characteristics due to the variable beam loading effect due to the acceleration of various particles and injected sample amounts. In this work, we proposed an AMS control system based on reinforcement learning. The proposed reinforcement learning finds the target control value in response to the environment through the learning process. We have designed a reinforcement learning based controller with RF system as an environment and verified the reinforcement learning based controller designed through the modeled cavity.

Poster TUP030 [0.527 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP030

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paper received ※ 14 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020

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TUP031

Design and Construction Progress of Cyclotron Based Proton Irradiation Facility for Space Science

cyclotron, proton, radiation, ion-source

230

Y.L. Lv, S. An, T. Cui, T. Ge, B. Ji, X.L. Jia, S.L. Wang, T.J. Zhang
CIAE, Beijing, People’s Republic of China

The proton irradiation facility for space science research and application consists of a 50 MeV proton cyclotron, two beam lines and two radiation effect simulation experimental target station. The 50 MeV proton cyclotron (CYCIAE-50) is a compact negative hydrogen ion cyclotron with the proton beam energy from 30 MeV to 50 MeV, and the beam intensity is from 10 nA to 10 uA. The cyclotron is about 3.2 m in diameter, 3.5 m in total height and 80 tons in total weight. The diameter of the pole is 2000 mm, the outer diameter of the yoke is 3200 mm, and the height of magnet is 1500 mm. The cyclotron uses an external multi-cusp H⁻ ion source. Then the H⁻ beam is injected into the accelerating orbit by the spiral inflector. The cyclotron frequency is about 16 MHz. The RF system is a pair of λ/2 RF cavities driven by a 25 kW transmitter. The fourth harmonic accelerating frequency is about 65 MHz. The proton beam is extracted by a single movable stripping carbon foil with the stripping extraction efficiency of 99%. The 50 MeV cyclotron has now been designed in detail, and its main components, such as the main magnets and RF cavities, are being manufactured in the factories in China.

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP031

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paper received ※ 15 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020

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TUP033

Concept of 15 Mev Cyclotron for Medical Isotopes Production

cyclotron, vacuum, proton, acceleration

233

O. Karamyshev
JINR, Dubna, Moscow Region, Russia

The purpose of this article is to show the prospects of cyclotrons with resistive coils and prove that even in such a well-established field there is still room for innovation. The concept of a 15 MeV cyclotron accelerating HÂ¯ ions with a current of up to 1 mA is presented. The design features significantly lower weight and power consumption, compared to the majority of existing cyclotrons of the same energy.

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP033

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paper received ※ 15 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020

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TUP037

Compact Cotangential Orbit Accelerator for Particle Therapy

extraction, kicker, septum, proton

245

T. Hae, H. Hiramoto
Hitachi Ltd., Hitachi Research Laboratory, Ibaraki-ken, Japan
T. Aoki, C. Hori, Y. Nakashima, F. Noda, T. Seki
Hitachi Ltd., Ibaraki-ken, Japan

A new type accelerator is being developed for the next generation particle therapy system. This accelerator utilizes a weak focusing DC magnetic field and a frequency modulated RF acceleration. Since a superconducting magnet is applicable to the main magnet, the accelerator can be compact. The accelerator characteristically has cotangential orbits to form an orbit-concentrated region. A beam is extracted from the region by using a new extraction method with the trans-verse RF kicker, peeler and regenerator magnetic fields. In this method an extracted beam energy can be controlled by applied time of the acceleration RF voltage without using an energy selection system (ESS). Intensity and pulse width of the extracted beam can be controlled by a voltage and / or a frequency pattern of the RF kicker.

Poster TUP037 [0.740 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP037

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paper received ※ 13 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020

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WEA02

The Developments of the RF System Related to the K-800 Superconducting Cyclotron Upgrade

cyclotron, extraction, acceleration, LLRF

262

A.C. Caruso, L. Calabretta, G. Costa, G. Gallo, A. Longhitano, D. Rifuggiato, A. Spartà, G. Torrisi, E. Zappalà
INFN/LNS, Catania, Italy

The K-800 superconducting cyclotron has been in operation at Laboratori Nazionali del Sud for almost 25 years. It has been subjected to continuous upgrades and modifications since 1994: the RF couplers have been redesigned, the new dees have been changed from aluminium to copper, as has the new central region from radial to axial injection of the beam, the hybrid configuration solid state - tube of the power amplifiers, the digital LLRF, etc. The next scheduled important upgrade of the Cyclotron mainly consists in a new extraction beam line able to support the increase of the beam current intensity. The accelerated beam will be extracted in two ways: by stripper and by electrostatic deflector and, consequently, one of the most important features of the new upgrade is the new cryostat. Further upgrades and refurbishments of the other main parts of the cyclotron, such as a new liner, the modification of the RF cavities and dees, the refurbishment of HLRF-LLRF, the insertion of the stripper extraction system, to name but a few, are in progress, too. This work focuses on the RF system upgrade.

Slides WEA02 [10.816 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-WEA02

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paper received ※ 15 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020

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THB01

Review of High Power Cyclotrons and Their Applications

cyclotron, proton, experiment, acceleration

289

L. Calabretta, D. Rifuggiato
INFN/LNS, Catania, Italy
M. Maggiore
INFN/LNL, Legnaro (PD), Italy

An incomplete review of existing machines and of present new projects of high power cyclotrons is here presented. Both high energy and low/medium energy cyclotrons will be described. Specific requests for different fields of applications are also discussed.

Slides THB01 [11.837 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-THB01

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paper received ※ 15 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020

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FRA01

A New Solution for Cost Effective, High Average Power (2 GeV, 6 MW) Proton Accelerator and its R&D Activities

FFAG, resonance, cyclotron, proton

334

T.J. Zhang, S. An, T.J. Bian, F.P. Guan, M. Li, S. Pei, C. Wang, F. Wang, Z.G. Yin
CIAE, Beijing, People’s Republic of China

The 100 MeV compact cyclotron, CYCIAE-100 was approved to start the construction in 2011, and the first proton beam was extracted on July 4, 2014. In 2017, the 200 µA proton beam development was conducted, and in 2018, the production of high power beam from 20 kW to 52 kW had been delivered successfully to the beam dump. Due to the successful construction of 435 tons magnet for CYCIAE-100, it has been proved that the gradient adjustment of magnetic field along radius can effectively enhance the vertical focusing during the isochronous acceleration. This key technology was applied to the general design of a 2 GeV CW proton accelerator, the energy limitation of the isochronous machine is increased from ~1 GeV to 2 GeV, by our contribution of the beam dynamics study for high energy isochronous FFAG. This paper will introduce CIAE’s engineering experience of precision magnet, high power RF systems, and the advantages of beam dynamics simulation based on large-scale parallel computing. The cost-effective solution for such a 2 GeV high power circular accelerator complex will be presented in detail after the brief introduction about the high power proton beam production by the CYCIAE-100.

Slides FRA01 [19.669 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-FRA01

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paper received ※ 15 September 2019 paper accepted ※ 23 June 2020 issue date ※ 20 June 2020

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FRA02

Current Status of Sumitomo’s Superconducting Cyclotron Development for Proton Therapy

cyclotron, extraction, proton, ion-source

340

H. Tsutsui, Y. Arakawa, Y. Ebara, A. Hashimoto, M. Hirabayashi, T. Hirayama, N. Kamiguchi, J. Kanakura, Y. Kumata, Y. Mikami, H. Mitsubori, T. Miyashita, T. Morie, H. Murata, H. Oda, H. Ookubo, T. Sakemi, M. Sano, T. Tachikawa, T. Takahashi, K. Taki, T. Tsurudome, T. Watanabe, J.Y. Yoshida
SHI, Tokyo, Japan

Sumitomo Heavy Industries, Ltd. is developing a com-pact superconducting isochronous 230 MeV cyclotron for proton therapy. It is designed to produce 1000 nA proton beams for high dose rate cancer treatment. The cyclotron magnet, which includes a liquid-helium-free cryostat, has been fabricated and the magnetic field has been measured. Magnetic field distribution and pa-rameters such as horizontal and vertical tunes agreed well with the original design. A 120 kW solid-state RF system is being tested. Other components such as the ion source and electrostatic deflector are being fabricated. After the testing of individual components, they will be assembled and beam testing will be scheduled at a new test site.

Slides FRA02 [8.556 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-FRA02

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paper received ※ 13 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020

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FRB03

3D Radio Frequency Simulation of the INFN-LNS Superconducting Cyclotron

cyclotron, simulation, experiment, extraction

361

G. Torrisi, L. Allegra, L. Calabretta, A.C. Caruso, G. Costa, G. Gallo, A. Longhitano, L. Neri, D. Rifuggiato
INFN/LNS, Catania, Italy

An upgrade plan of the Superconducting Cyclotron operating at INFN-LNS is ongoing. In this paper, a 3D numerical model of the Cyclotron radio frequency cavity is presented. Simulations include the coaxial sliding shorts, liner vacuum chamber, coupler, trimming capacitor and the Dees structures. CST microwave studio software has been used for numerical computation. RF simulations are mandatory also in order to analyze the field in the beam region and evaluate the impact of different Dees geometry and eventual field asymmetries. Moreover, 3D COMSOL Multiphysics simulations have been carried out in order to couple the electromagnetic field solution to a custom beam-dynamics code developed in Matlab as a future plan. Time evolution of accelerated beam and electromagnetic field make also possible to verify the magnetic field synchronization. Experimental validation of the developed model will be also presented.

Slides FRB03 [19.931 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-FRB03

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paper received ※ 15 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020

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