Cyclotrons2019 - Table of Session: MOP (POSTER SESSION)

Paper	Title	Page
MOP001	Design and Commissioning of RF System for SC200 Cyclotron	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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MOP002	Recent Progress on Ion Source of SC200 Cyclotron	24
	Y. Zhao, G. Chen ASIPP, Hefei, People’s Republic of China L. Calabretta INFN/LNS, Catania, Italy O. Karamyshev JINR/DLNP, Dubna, Moscow region, Russia G.A. Karamysheva, G. Shirkov JINR, Dubna, Moscow Region, Russia S.W. Xu USTC, Hefei, Anhui, People’s Republic of China
	Funding: National Natural Science Foundation of China under grant No. 11775258 & 11575237 and International Scientific and Technological Cooperation Project of Anhui (grant No. 1704e1002207). A 200MeV compact superconducting cyclotron, named SC200, for proton therapy is under development by collaboration of ASIPP (Hefei, China) and JINR (Dubna, Russia). The ion source is a significant subsystem of the cyclotron. A hot cathode internal ion source has been designed and tested for SC200 cyclotron. The ion source has been successfully arc discharged on the test bench. The extracted beam current has been measured over 100 uA and filament lifetime of ion source exceeded 100 h, which indicated that the ion source meets the design requirements. The stability of the filament under strong magnetic field has also been tested and the differences between the two kinds of filament are compared.
	Poster MOP002 [0.519 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP002
About •	paper received ※ 09 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
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MOP003	Optimal Design and Fluid-Solid Coupling Thermal Analysis of SC200 Superconducting Proton Cyclotron Electrostatic Deflector	27
	Y. Xu, Y. Chen, K.Z. Dingpresenter, X.Y. Huang, J. Li, K. Pei, Y. Song ASIPP, Hefei, People’s Republic of China K. Gu HFCIM, HeFei, People’s Republic of China
	Funding: National Natural Science Foundation of China under grant No. 11775258 & 11575237 and International Scientific and Technological Cooperation Project of Anhui (grant No. 1704e1002207). In recent years, the study of proton therapy equipment has received increasing attention in China. Hefei CAS Ion Medical and Technical Devices Co., Ltd. (HFCIM) is developing a proton medical device based on the super-conducting proton cyclotron. The electrostatic deflector (ESD) is the key extraction component of the SC200 superconducting cyclotron, which uses a high-intensity electric field to bend the beam from the track. The fierce interaction between the proton beam and the deflector septum, causes a great loss of beam and unwanted excess heat accumulation and radiation. In order to minimize the risk of damage caused by the proton beam loss, the fluid solid-thermal coupling analysis of the deflector was per-formed by applying computational fluid dynamics (CFD) on ANSYS. The maximum temperatures of the septum in various cases of the cooling water speed, the septum thickness and material have been investigated respective-ly. The result based on analysis provide a valuable refer-ence for the further optimization on the material selection and structural design for ESD.
	Poster MOP003 [0.735 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP003
About •	paper received ※ 15 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
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MOP004	Beam Dynamics Simulation of the Extraction for a Superconducting Cyclotron SC240	31
	Z. Wu, K.Z. Dingpresenter, J. Li, Y. Song ASIPP, Hefei, People’s Republic of China Z. Wang HFCIM, HeFei, People’s Republic of China
	In order to diversify the company’s cyclotron, a design study has been carried out on a 240 MeV superconducting cyclotron SC240 for proton therapy, which is based on our experience in design of SC200. In order to increase turn separation and extraction efficiency, resonant precessional extraction method is employed in the extraction system. A first harmonic field consistent with the Gaussian distribution is added to introduce beam precessional motion. Its effects on phase space evolution and turn separation increase is studied by a high efficiency beam dynamics simulation code. According to the study, its amplitude and phase have been optimized to meet the requirements of extraction beam dynamics. Based on beam dynamics simulation, the parameters of extraction system elements (two electrostatic deflectors and six magnetic channels) are chosen. Besides, the effects of sectors spiral direction on beam extraction are studied. Extraction efficiencies and beam parameters have been calculated.
	Poster MOP004 [1.696 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP004
About •	paper received ※ 14 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
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MOP006	The Design and Simulation on the Extraction System for CYCIAE-50	35
	S. An, F.P. Guan, P. Huang, L.Y. Ji, M. Li, Y.L. Lv, S.M. Wei, L.P. Wen, H.D. Xie, J.S. Xing, T.J. Zhang, X. Zheng CIAE, Beijing, People’s Republic of China
	A 50 MeV H⁻ compact cyclotron (CYCIAE-50) as a proton irradiation facility is under construction at China Institute of Atomic Energy. The proton beam with the energy of 30 MeV to 50 MeV and the current of 10 uA will be extracted by a single stripping extraction system. In order to reduce the beam loss, the combination magnet is fixed inside the magnetism yoke. The positions of stripping points for the different extraction energy are calculated and the extracted beam trajectories after stripping foil are simulated in detail in this paper. The extracted beam distribution after stripping foil and the extracted beam characters will be studied in this paper. The beam parameters after extraction will be given by the extracting orbit simulation. The design on the whole stripping extraction system has been finished and will be presented in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP006
About •	paper received ※ 15 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020
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MOP007	The Design and Calculation on the Injection and Central Region for CYCIAE-50	39
	L.Y. Ji, S. An, F.P. Guan, P. Huang, X.L. Jia, Y.L. Lv, C. Wang, S.L. Wang, T.J. Zhang, X. Zheng CIAE, Beijing, People’s Republic of China
	A 50 MeV cyclotron (CYCIAE-50) is been building at China Institute of Atomic Energy. CYCIAE-50 is a compact H⁻ cyclotron with the proton beam energy of 30 MeV to 50 MeV and the beam current of 10 uA. A multi-cusp H⁻ ion source with the beam current of 3 mA will be used for this machine. The design on the injection and central region of CYCIAE-50 has been finished. The way of matching the beam from ion source to central region and the design of central region will be present in this paper. In addition, some significant problems in central region will be discussed, including radial alignment, axial focusing, longitudinal focusing and energy gain, etc.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP007
About •	paper received ※ 15 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020
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MOP008	Mechanical Design of Beam Lines for a 230 MeV SC Cyclotron at CIAE	42
	M. Yin, S. An, F.P. Guan, Y.L. Lv, G.F. Pan, F. Wang, F. Wang, S.M. Wei, L.P. Wen, T.J. Zhang, F.Zhu. Zhu CIAE, Beijing, People’s Republic of China
	Funding: This work was supported in part by the National Natural Science Foundation of China under Grant 11475269 and 11375274. To develop the proton beam transfer system which used in the field of proton therapy, the mechanical design of proton beam lines based on the CYCIAE-230 has been finished at the China Institute of Atomic Energy (CIAE). The proton beam transfer system includes the beam lines, beam dump, gantry, nozzle, couch, image guidance system, etc. Two beam lines are designed at CIAE this moment. One is for the nozzle system, the other is for the beam dump. The beam lines include four systems: the energy selection system, the beam transportation systems, gantry system, beam dump. The beam lines are very compact in order to match the beam optics and the space limitation. The gantry can be rotated ±180°. There are several key components in beam lines, such as magnets, degrader, beam diagnostics component, vacuum component, etc. The designed mechanical tolerance of the magnets is limited less than 0.1 mm. There are at least four targets on each magnets for collimation and all the components can be adjusted in three dimensions. The magnets are being manufactured now. The mechanical design of proton beam lines based on the CYCIAE-230 will be presented in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP008
About •	paper received ※ 15 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020
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MOP010	A 50 MeV Proton Beam Line Design	45
	S.M. Wei, S. An, L.L. Guan, Y.L. Lv CIAE, Beijing, People’s Republic of China
	The cyclotron Center at the China Institute of Atomic Energy (CIAE) is now developing a medium-energy proton irradiation device that provides a proton beam with an energy range of 30 MeV to 50 MeV to simulate a space proton radiation environment, which has a significant impact on spacecraft. A beam transport line is designed for irradiation effect study based on the 50 MeV compact cyclotron, which requires continuous adjustment of the beam energy and the beam spot on the target requires high uniformity. The proton beam extracted from the cyclotron is adjusted to the energy required by using the degrader, then the proton beam is bended and focused. In order to obtain uniform large-diameter beam spot on the target, a wobbling magnet is installed on the beam line to uniformly sweep the proton beam on the target and finally obtain the proton beam with energy of 30 MeV - 50 MeV, current of 10 uA and beam spot of 20 cm * 20 cm on the target.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP010
About •	paper received ※ 15 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020
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MOP011	Magnetic Field Measurement and Shimming for a Medical Compact Cyclotron	48
	L.L. Guan, S. An, T. Cui, P. Huang, X.L. Jia, M. Li, F. Wang, T.J. Zhang CIAE, Beijing, People’s Republic of China
	A compact cyclotron is developed by Cyclotron Accelerator Research Center at China Institute of Atomic Energy (CIAE) to extract 14 MeV proton beam for medical radioisotopes production, so as to meet the market demands of early diagnosis of malignant tumors, cardiovascular and cerebrovascular diseases. Owing to the small size and limited space of small medical cyclotrons, critical requirements are imposed on magnetic field measurement. For this reason, a magnetic field measurement system, with high-precision and high-stability, suitable for small cyclotrons is adopted and then an efficient magnetic field shimming method is used, which greatly reduces the construction period. It provides a strong guarantee for the stable operation of medical small cyclotrons.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP011
About •	paper received ※ 15 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020
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MOP013	Mechanical Modifications of the Median Plane for the Superconducting Cyclotron Upgrade	51
	G. Gallo, L. Allegra, L. Calabretta, A.C. Caruso, G. Costa, E. Messina, M.S. Musumeci, D. Rifuggiato, E. Zappalà INFN/LNS, Catania, Italy
	The Superconducting Cyclotron (CS) is a three sectors, compact accelerator with a wide operating diagram, capable of accelerating heavy ions with q/A from 0.1 to 0.5 up to energies from 2 to 100 MeV/u. Recently a significant upgrade has been proposed to increase the light ion beam intensity by means of extraction by stripping. For the implementation of the new extraction mode, many relevant modifications are needed in the median plane. The biggest upgrade action is the replacement of the present superconducting magnet with a new one, compatible with the beam trajectory and envelope in the extraction by stripping. The extraction by stripping mode implies the installation of two stripper systems, one in a hill and the other in a valley, that allow to extract all the ions requested by the users. Finally, since the present electrostatic extraction mode will be maintained, several relevant mechanical issues have to be faced when switching from one extraction mode to the other one, the location of one electrostatic deflector being the same as the stripper system. The focus of this paper will be the presentation of the different mechanical features involved in the upgrade.
	Poster MOP013 [1.583 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP013
About •	paper received ※ 12 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
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MOP014	3D Magnetic Optimization of the New Extraction Channel for the LNS Superconducting Cyclotron	54
	L. Neri, L. Allegra, L. Calabretta, G. Costa, G. D’Agostino, G. Gallo, D. Rifuggiato, A.D. Russo, G. Torrisi INFN/LNS, Catania, Italy
	The upgrade of the Superconducting Cyclotron operating at INFN-LNS is the main objective of the general upgrade of the LNS facility, consisting in the enhancement of light ion beam intensity. To overcome the present maximum power of 100 W of the beam extracted by electrostatic deflector and achieve a beam power as high as 10 kW, the implementation of the extraction by stripping method has been proposed. Intense ion beams with mass in the range 10 to 40 amu (12C, 18O, 20Ne, 40Ar) in the energy range of interest (15-70 MeV/u) will be delivered to the NUMEN experiment, as well as used for production of in-flight radioactive beams. The present work consists in the optimization of the magnetic channels needed to limit the radial and axial beam envelopes. The design of the magnetic channels has been accomplished by fully three-dimensional magneto-static simulations using Comsol Multiphysics and a custom transport code developed in Matlab along the last year at INFN-LNS. The effect of a magnetic shielding structure in the extraction channel is presented, together with the possibility of producing a magnetic gradient from an asymmetric coil.
	Poster MOP014 [2.968 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP014
About •	paper received ※ 15 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
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MOP016	Vertical Focussing with a Field Gradient Spiral Inflector	58
	A.H. Barnard, J.I. Broodryk, J.L. Conradie, J.G. De Villiers, J. Mira, F. Nemulodi, R.W. Thomae iThemba LABS, Somerset West, South Africa
	Traditional spiral inflectors suffer from vertical defocussing, leading to beam loss. In this study the electrode shape of an inflector is modified to intentionally produce transverse electric field gradients, which have a significant influence on the optics. This is done by placing the traditionally parallel electrodes at an angle relative to each other in the transverse plane, creating a quadrupole field on the central path. Varying the electrode angle along the path length creates an alternating-gradient effect. The electrode entrance and exit faces are also shaped to create quadrupoles inside the fringe field. By numerical optimisation a design with good vertical focussing is obtained. Experiments show a roughly 100% increase in transmission in cases where the buncher is turned off. However, high losses at extraction are observed with the buncher turned on, due to RF-phase spread introduced by longitudinal defocussing in the inflector. This results in an improvement of only 20% during normal cyclotron operation, and shows that an inflector should ideally focus vertically and longitudinally at the same time. Ongoing work to achieve such combined focussing is described.
	Poster MOP016 [1.410 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP016
About •	paper received ※ 13 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
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MOP017	Research on Metallic Ion Beam Production With Electron Cyclotron Resonance Ion Sources	62
	S.L. Bogomolov, A.A. Efremov, K.I. Kuzmenkov, D.K. Pugachev, Yu. Yazvitsky JINR, Dubna, Moscow Region, Russia J.L. Conradie, D.T. Fourie, N.Y. Kheswa, J. Mira, F. Nemulodi, R.W. Thomae iThemba LABS, Somerset West, South Africa
	Many experiments in nuclear physics request the production of metallic ion beams. All elements from lithium up to uranium are of interest and most of them are required as a specific isotope which demands commonly enriched materials. Depending on the material properties beams of rare isotopes can be produced from solid materials or solid compounds. In this report the results of experiments carried out under a collaboration of JINR and iThemba LABS on the production of metallic ions from Electron Cyclotron Resonance Ion Sources (ECRIS) using resistive oven evaporation, Metal Ions from VOlatile Compounds (MIVOC) method and sputtering technique will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP017
About •	paper received ※ 11 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020
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MOP018	Simulation of the Axial Injection Beam Line of DC140 Cyclotron of FLNR JINR	66
	N.Yu. Kazarinov, J. Franko, G.G. Gulbekyan, I.A. Ivanenkopresenter, I.V. Kalagin JINR, Dubna, Moscow Region, Russia
	Flerov Laboratory of Nuclear Reaction of Joint Institute for Nuclear Research carries out the works under creating FLNR JINR Irradiation Facility based on the cyclotron DC140. The facility is intended for SEE testing of microchip, for production of track membranes and for solving of applied physics problems. The main systems of DC140 are based on the DC72 cyclotron ones that now are under reconstruction. The DC140 cyclotron is intended for acceleration of heavy ions with mass-to-charge ratio A/Z within interval from 5 to 5.5 up to two fixed energies 2.136 and 4.8 MeV per unit mass. The intensity of the accelerated ions will be about 1 pµAmps for light ions (A<86) and about 0.1 pµAmps for heavier ions (A>132). The injection into cyclotron will be realized from the external room temperature 18 GHz ECR ion source. The simulation of the axial injection system of the cyclotron is presented in this report.
	Poster MOP018 [1.331 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP018
About •	paper received ※ 29 August 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
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MOP019	The Results of Magnetic Field Formation and Commissioning of Heavy-Ion Isochronous Cyclotron DC280	70
	I.A. Ivanenko, G.G. Gulbekyan, G.N. Ivanov, I.V. Kalagin, V.A. Semin JINR, Dubna, Moscow Region, Russia
	The DC280 cyclotron is the new accelerator of FLNR Super Heavy Elements Factory. It was commissioned in the beginning of 2019. DC280 is intended for production of high intensity, up to 10 pmkA, beams of heavy ions with mass to charge ratio A/Z= 4 - 7. The wide range of accelerated ions from helium to uranium and smooth variation of extracted beam energy in the range W= 4 - 8 MeV/n are provided by varying of level of main magnetic field from 0.64 T till 1.32 T. The DC280 magnetic field was formed in a good conformity with results of computer modeling. In spite of commissioning of cyclotron still is in progress, the first experiments gave the intensity 1.35 pmkA of 84Kr¹⁴⁺ and 10 pmkA of 12C²⁺. At the present work the results of calculations, magnetic field measurements and first experiments are presented.
	Poster MOP019 [1.368 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP019
About •	paper received ※ 12 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020
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MOP020	Simulation of the Beam Extraction System of DC140 Cyclotron of FLNR JINR	73
	N.Yu. Kazarinov, G.G. Gulbekyan, I.A. Ivanenkopresenter JINR, Dubna, Moscow Region, Russia
	Flerov Laboratory of Nuclear Reaction of Joint Institute for Nuclear Research carries out the works under creating FLNR JINR Irradiation Facility based on the cyclotron DC140. The facility is intended for SEE testing of microchip, for production of track membranes and for solving of applied physics problems. The main systems of DC140 are based on the DC72 cyclotron ones that now are under reconstruction. The DC140 cyclotron is intended for acceleration of heavy ions with mass-to-charge ratio A/Z within interval from 5 to 5.5 up to two fixed energies 2.136 and 4.8 MeV per unit mass. The intensity of the accelerated ions will be about 1 pµAmps for light ions (A<86) and about 0.1 pµAmps for heavier ions (A>132). The beam extraction system consists of electrostatic deflector and two magnetic channels. The simulation of the extraction system of the cyclotron is presented in this report. The extracted beams characteristics outside the cyclotron, that will serve as initial conditions for the design of experimental beam lines of FLNR JINR IF are determined.
	Poster MOP020 [9.336 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP020
About •	paper received ※ 29 August 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
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MOP021	Simulation of Beam Extraction from TR24 Cyclotron at IPHC	76
	N.Yu. Kazarinov, I.A. Ivanenkopresenter JINR, Dubna, Moscow Region, Russia T. Adam, F.R. Osswald, E.K. Traykov IPHC, Strasbourg Cedex 2, France
	The CYRCé (CYclotron pour la ReCherche et Enseignement) TR24 cyclotron is used at IPHC (Institut Pluridisciplinaire Hubert Curien) for the production of radio-isotopes for diagnostics, medical treatments and fundamental research in radiobiology. The TR24 cyclotron produced and commercialized by ACSI delivers a 16-25 MeV proton beam with intensity from few nA up to 500 µA. The TR24 is a compact isochronous cyclotron with normal-conducting magnet and stripper foil for the beam extraction. The calculation model for OPERA 3D program code is described. The magnetic field map in the working region of the cyclotron is generated. The beam characteristics outside the cyclotron, that will serve as initial conditions for the design of future beam lines are determined.
	Poster MOP021 [15.509 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP021
About •	paper received ※ 29 August 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
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MOP022	Project of a Novel Multi-Orbital Beam Bunching and Extraction from the U-120M Cyclotron	80
	M. Čihák, R. Běhal, P. Kristpresenter, T. Matlocha, J. Stursa, V. Zach NPI, Řež near Prague, Czech Republic
	We introduce the bunching system for a time structure control of the U-120M cyclotron beam. The system is based on a unique pulsed vertical deflection of the selected final orbits of the internal accelerated beam of the H⁻ ions to an extractor-stripper (a thin carbon foil positioned below the cyclotron median plane). A set of home-made programs have been developed for simulations and parameters determination of the system. Results of some simulations (i.e. dimensions of the deflection system, parameters of the pulsed high voltage power supply, position of the stripper, beam trajectories, beam parameters, beam losses, Be target position etc.) are presented. The system will be used for fast neutron generation and consequently for spectrometric measurement of neutron energy by the time of flight (ToF) method. The system will provide beam bunch interval up to 1000 ns range of a defined beam time structure (up to beam bunch period to beam bunch width ratio min 100).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP022
About •	paper received ※ 15 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020
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MOP023	Synchronization and High Speed High Voltage Switcher for Pulse Bunching System of the Cyclotron U-120M	83
	P. Krist, D. Pokloppresenter, J. Stursa NPI, Řež near Prague, Czech Republic V. Cervenka HiLASE Centre, Institute of Physics ASCR, v.v.i., Dolní BřeÂany, Czech Republic J. Vozáb Radan s.r.o., Barchov, Czech Republic
	Pulse bunching system for neutron time of flight (ToF) measurements on the cyclotron U-120M exploits a unique pulsed vertical deflection of the selected final orbits of the internal accelerated beam of the H⁻ ions to an extractor-stripper. This system is described in details on an individual poster of this conference. A key device is the pulse HV power supply (HV switcher) which is supplying the deflector and elevates H⁻ ions in defined time structure to an extractor-stripper. The developed HV switcher is based on the SiC MOSFET transistors. It can provide HV pulses with the following pulse parameters: amplitude up to 13 kV, front edge less than 20 ns, flat top 20 ns, back edge less than 20 ns and repetition frequency up to several hundred of kHz. We have also developed the pulse synchronization with the cyclotron RF (25 MHz), which enables to set up front edge of bunching pulses within 2pi with accuracy 80 ps. Human-machine interface is based on SCADA software Reliance and PLC Tecomat Foxtrot. The time waveforms of the real pulses are part of the presentation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP023
About •	paper received ※ 15 September 2019 paper accepted ※ 25 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	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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MOP025	Fast Recharging of Electrostatic Injection and Extraction Septa After Breakdown	90
	R. Dölling PSI, Villigen PSI, Switzerland J. Brutscher Private Address, Dresden, Germany
	We propose to recharge an electrostatic injection or extraction septum in a high-power cyclotron fast enough to omit the need for switching off the beam at a high voltage breakdown.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP025
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	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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MOP029	Design and Manufacture of 10 kW, 83.2 MHz 4-way Power Combiner for Solid State Amplifier	97
	D.H. Ha, J.-S. Chai, Kh.M. Gad, M. Ghergherehchi, H.S. Kim, J.C. Lee, H. Namgoong SKKU, Suwon, Republic of Korea
	The purpose of this study is to improve the insertion loss of a 20 kW solid-state RF power amplifier and the power coupling efficiency by reducing reflected power. For this purpose, a power combiner, which is a core component of a solid-state RF power amplifier, was designed and fabricated. The 4-way power combiner employs the Wilkinson type, which has excellent power coupling efficiency and isolation, and operates at 83.2 MHz. This paper covers the design and cold test results.
	Poster MOP029 [1.396 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP029
About •	paper received ※ 15 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020
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MOP030	RF measurement of SKKUCY-10 RF Cavity for Impedance Matching	100
	J.C. Lee, J.-S. Chai, Kh.M. Gad, M. Ghergherehchi, D.H. Hapresenter, 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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MOP031	Design of High Sensitive Magnet and Beam Dynamics for AMS Cyclotron	103
	H. Namgoong, J.-S. Chai, M. Ghergherehchi, D.H. Ha, H.S. Kim, J.C. Lee SKKU, Suwon, Republic of Korea
	To produce a carbon-14 for Accelerator Mass Spectrometry (AMS), AMS Cyclotron magnet was designed. For the AMS system, Cyclotron magnet has been required high mass resolution. In order to realize high mass resolution, the phase error is designed within ±10 and the mass resolution was 5000. We used CST particle studio and Cyclone for beam dynamics simulation of this cyclotron magnet. This paper describes the AMS cyclotron magnet and beam dynamics design.
	Poster MOP031 [2.281 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP031
About •	paper received ※ 15 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
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MOP032	Control System in 10 MeV Cyclotron Based on IoT	106
	M. Mohamadian, H. Afarideh, S. Babaee, H. Pashaei, N. Salmani AUT, Tehran, Iran M. Ghergherehchipresenter 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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MOP034	Beam Stripping Interactions Implemented in Cyclotrons with OPAL Simulation Code	109
	P. Calvo, C. Oliver CIEMAT, Madrid, Spain A. Adelmann, M. Frey, A. Gsell, J. Snuverink PSI, Villigen PSI, Switzerland
	Beam transmission optimization and losses characterization, where beam stripping interactions are a key issue, play an important role in the design and operation of compact cyclotrons. A beam stripping model has been implemented in the three-dimensional object-oriented parallel code OPAL-cycl, a flavor of the OPAL framework. The model includes Monte Carlo methods for interaction with residual gas and dissociation by electromagnetic stripping. The model has been verified with theoretical models and it has been applied to the AMIT cyclotron according to design conditions.
	Poster MOP034 [0.880 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP034
About •	paper received ※ 12 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020
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MOP035	Extraction Beam Orbit of a 250 MeV Superconducting Cyclotron	113
	H.J. Zhang, K. Fan, Y. Yan Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People’s Republic of China Y.-N. Rao TRIUMF, Vancouver, Canada L.G. Zhang HUST, Wuhan, People’s Republic of China
	Funding: The work is supported by the National Nature Science Foundation of China (11775087). A superconducting cyclotron based on proton therapy facility is being developed at Huazhong university of science and technology (HUST). Due to the compact size of the main magnet, the beam orbits at the extraction region are distributed densely, which creates difficulties for beam extraction leading to severe beam loss. In order to deal with these challenges, the orbit precession method has been employed in the extraction system design. In this paper, we introduce a method of employing a first harmonic field near the nu_r=1 resonance where the beam energy is about 248 MeV to adjust the amplitude of beam orbit oscillation. The optimum amplitude and phase of the first harmonic field are designed to obtain a large turn separation in the extraction region. Three different ways of generating the first harmonic field are compared for optimization.
	Poster MOP035 [0.777 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP035
About •	paper received ※ 15 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020
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MOP036	The Magnetic Field Design of Cyclotron at IMP	116
	Q.G. Yao, B. Wang, B.M. Wu, W. Wu, L. Yang IMP/CAS, Lanzhou, People’s Republic of China
	A cyclotron magnet is studied at Institute of Modern Physics, Chinese Academy of Sciences (IMP, CAS), and the whole system include one main magnet and other magnetic gradient correctors, which is used to accelerate the Kr²⁶⁺ beam. The structure of superconducting coils and room-temperature iron core are adopted for the main magnet. This paper describes the magnetic field design of the cyclotron, and several shimming methods are used to meet the isochronous magnetic field of Kr²⁶⁺ beam, including pole face shimming method and side shimming method. The final optimization results show that the error between simulation and theory value is small. In addition, the magnet structure is also described.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP036
About •	paper received ※ 17 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020
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Paper

Title

Page

Design and Commissioning of RF System for SC200 Cyclotron

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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MOP002

Recent Progress on Ion Source of SC200 Cyclotron

24

Y. Zhao, G. Chen
ASIPP, Hefei, People’s Republic of China
L. Calabretta
INFN/LNS, Catania, Italy
O. Karamyshev
JINR/DLNP, Dubna, Moscow region, Russia
G.A. Karamysheva, G. Shirkov
JINR, Dubna, Moscow Region, Russia
S.W. Xu
USTC, Hefei, Anhui, People’s Republic of China

Funding: National Natural Science Foundation of China under grant No. 11775258 & 11575237 and International Scientific and Technological Cooperation Project of Anhui (grant No. 1704e1002207).
A 200MeV compact superconducting cyclotron, named SC200, for proton therapy is under development by collaboration of ASIPP (Hefei, China) and JINR (Dubna, Russia). The ion source is a significant subsystem of the cyclotron. A hot cathode internal ion source has been designed and tested for SC200 cyclotron. The ion source has been successfully arc discharged on the test bench. The extracted beam current has been measured over 100 uA and filament lifetime of ion source exceeded 100 h, which indicated that the ion source meets the design requirements. The stability of the filament under strong magnetic field has also been tested and the differences between the two kinds of filament are compared.

Poster MOP002 [0.519 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP002

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

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MOP003

Optimal Design and Fluid-Solid Coupling Thermal Analysis of SC200 Superconducting Proton Cyclotron Electrostatic Deflector

27

Y. Xu, Y. Chen, K.Z. Dingpresenter, X.Y. Huang, J. Li, K. Pei, Y. Song
ASIPP, Hefei, People’s Republic of China
K. Gu
HFCIM, HeFei, People’s Republic of China

Funding: National Natural Science Foundation of China under grant No. 11775258 & 11575237 and International Scientific and Technological Cooperation Project of Anhui (grant No. 1704e1002207).
In recent years, the study of proton therapy equipment has received increasing attention in China. Hefei CAS Ion Medical and Technical Devices Co., Ltd. (HFCIM) is developing a proton medical device based on the super-conducting proton cyclotron. The electrostatic deflector (ESD) is the key extraction component of the SC200 superconducting cyclotron, which uses a high-intensity electric field to bend the beam from the track. The fierce interaction between the proton beam and the deflector septum, causes a great loss of beam and unwanted excess heat accumulation and radiation. In order to minimize the risk of damage caused by the proton beam loss, the fluid solid-thermal coupling analysis of the deflector was per-formed by applying computational fluid dynamics (CFD) on ANSYS. The maximum temperatures of the septum in various cases of the cooling water speed, the septum thickness and material have been investigated respective-ly. The result based on analysis provide a valuable refer-ence for the further optimization on the material selection and structural design for ESD.

Poster MOP003 [0.735 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP003

About •

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

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MOP004

Beam Dynamics Simulation of the Extraction for a Superconducting Cyclotron SC240

31

Z. Wu, K.Z. Dingpresenter, J. Li, Y. Song
ASIPP, Hefei, People’s Republic of China
Z. Wang
HFCIM, HeFei, People’s Republic of China

In order to diversify the company’s cyclotron, a design study has been carried out on a 240 MeV superconducting cyclotron SC240 for proton therapy, which is based on our experience in design of SC200. In order to increase turn separation and extraction efficiency, resonant precessional extraction method is employed in the extraction system. A first harmonic field consistent with the Gaussian distribution is added to introduce beam precessional motion. Its effects on phase space evolution and turn separation increase is studied by a high efficiency beam dynamics simulation code. According to the study, its amplitude and phase have been optimized to meet the requirements of extraction beam dynamics. Based on beam dynamics simulation, the parameters of extraction system elements (two electrostatic deflectors and six magnetic channels) are chosen. Besides, the effects of sectors spiral direction on beam extraction are studied. Extraction efficiencies and beam parameters have been calculated.

Poster MOP004 [1.696 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP004

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

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MOP006

The Design and Simulation on the Extraction System for CYCIAE-50

35

S. An, F.P. Guan, P. Huang, L.Y. Ji, M. Li, Y.L. Lv, S.M. Wei, L.P. Wen, H.D. Xie, J.S. Xing, T.J. Zhang, X. Zheng
CIAE, Beijing, People’s Republic of China

A 50 MeV H⁻ compact cyclotron (CYCIAE-50) as a proton irradiation facility is under construction at China Institute of Atomic Energy. The proton beam with the energy of 30 MeV to 50 MeV and the current of 10 uA will be extracted by a single stripping extraction system. In order to reduce the beam loss, the combination magnet is fixed inside the magnetism yoke. The positions of stripping points for the different extraction energy are calculated and the extracted beam trajectories after stripping foil are simulated in detail in this paper. The extracted beam distribution after stripping foil and the extracted beam characters will be studied in this paper. The beam parameters after extraction will be given by the extracting orbit simulation. The design on the whole stripping extraction system has been finished and will be presented in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP006

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

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MOP007

The Design and Calculation on the Injection and Central Region for CYCIAE-50

39

L.Y. Ji, S. An, F.P. Guan, P. Huang, X.L. Jia, Y.L. Lv, C. Wang, S.L. Wang, T.J. Zhang, X. Zheng
CIAE, Beijing, People’s Republic of China

A 50 MeV cyclotron (CYCIAE-50) is been building at China Institute of Atomic Energy. CYCIAE-50 is a compact H⁻ cyclotron with the proton beam energy of 30 MeV to 50 MeV and the beam current of 10 uA. A multi-cusp H⁻ ion source with the beam current of 3 mA will be used for this machine. The design on the injection and central region of CYCIAE-50 has been finished. The way of matching the beam from ion source to central region and the design of central region will be present in this paper. In addition, some significant problems in central region will be discussed, including radial alignment, axial focusing, longitudinal focusing and energy gain, etc.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP007

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

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MOP008

Mechanical Design of Beam Lines for a 230 MeV SC Cyclotron at CIAE

42

M. Yin, S. An, F.P. Guan, Y.L. Lv, G.F. Pan, F. Wang, F. Wang, S.M. Wei, L.P. Wen, T.J. Zhang, F.Zhu. Zhu
CIAE, Beijing, People’s Republic of China

Funding: This work was supported in part by the National Natural Science Foundation of China under Grant 11475269 and 11375274.
To develop the proton beam transfer system which used in the field of proton therapy, the mechanical design of proton beam lines based on the CYCIAE-230 has been finished at the China Institute of Atomic Energy (CIAE). The proton beam transfer system includes the beam lines, beam dump, gantry, nozzle, couch, image guidance system, etc. Two beam lines are designed at CIAE this moment. One is for the nozzle system, the other is for the beam dump. The beam lines include four systems: the energy selection system, the beam transportation systems, gantry system, beam dump. The beam lines are very compact in order to match the beam optics and the space limitation. The gantry can be rotated ±180°. There are several key components in beam lines, such as magnets, degrader, beam diagnostics component, vacuum component, etc. The designed mechanical tolerance of the magnets is limited less than 0.1 mm. There are at least four targets on each magnets for collimation and all the components can be adjusted in three dimensions. The magnets are being manufactured now. The mechanical design of proton beam lines based on the CYCIAE-230 will be presented in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP008

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

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MOP010

A 50 MeV Proton Beam Line Design

45

S.M. Wei, S. An, L.L. Guan, Y.L. Lv
CIAE, Beijing, People’s Republic of China

The cyclotron Center at the China Institute of Atomic Energy (CIAE) is now developing a medium-energy proton irradiation device that provides a proton beam with an energy range of 30 MeV to 50 MeV to simulate a space proton radiation environment, which has a significant impact on spacecraft. A beam transport line is designed for irradiation effect study based on the 50 MeV compact cyclotron, which requires continuous adjustment of the beam energy and the beam spot on the target requires high uniformity. The proton beam extracted from the cyclotron is adjusted to the energy required by using the degrader, then the proton beam is bended and focused. In order to obtain uniform large-diameter beam spot on the target, a wobbling magnet is installed on the beam line to uniformly sweep the proton beam on the target and finally obtain the proton beam with energy of 30 MeV - 50 MeV, current of 10 uA and beam spot of 20 cm * 20 cm on the target.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP010

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

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MOP011

Magnetic Field Measurement and Shimming for a Medical Compact Cyclotron

48

L.L. Guan, S. An, T. Cui, P. Huang, X.L. Jia, M. Li, F. Wang, T.J. Zhang
CIAE, Beijing, People’s Republic of China

A compact cyclotron is developed by Cyclotron Accelerator Research Center at China Institute of Atomic Energy (CIAE) to extract 14 MeV proton beam for medical radioisotopes production, so as to meet the market demands of early diagnosis of malignant tumors, cardiovascular and cerebrovascular diseases. Owing to the small size and limited space of small medical cyclotrons, critical requirements are imposed on magnetic field measurement. For this reason, a magnetic field measurement system, with high-precision and high-stability, suitable for small cyclotrons is adopted and then an efficient magnetic field shimming method is used, which greatly reduces the construction period. It provides a strong guarantee for the stable operation of medical small cyclotrons.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP011

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

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MOP013

Mechanical Modifications of the Median Plane for the Superconducting Cyclotron Upgrade

51

G. Gallo, L. Allegra, L. Calabretta, A.C. Caruso, G. Costa, E. Messina, M.S. Musumeci, D. Rifuggiato, E. Zappalà
INFN/LNS, Catania, Italy

The Superconducting Cyclotron (CS) is a three sectors, compact accelerator with a wide operating diagram, capable of accelerating heavy ions with q/A from 0.1 to 0.5 up to energies from 2 to 100 MeV/u. Recently a significant upgrade has been proposed to increase the light ion beam intensity by means of extraction by stripping. For the implementation of the new extraction mode, many relevant modifications are needed in the median plane. The biggest upgrade action is the replacement of the present superconducting magnet with a new one, compatible with the beam trajectory and envelope in the extraction by stripping. The extraction by stripping mode implies the installation of two stripper systems, one in a hill and the other in a valley, that allow to extract all the ions requested by the users. Finally, since the present electrostatic extraction mode will be maintained, several relevant mechanical issues have to be faced when switching from one extraction mode to the other one, the location of one electrostatic deflector being the same as the stripper system. The focus of this paper will be the presentation of the different mechanical features involved in the upgrade.

Poster MOP013 [1.583 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP013

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paper received ※ 12 September 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020

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MOP014

3D Magnetic Optimization of the New Extraction Channel for the LNS Superconducting Cyclotron

54

L. Neri, L. Allegra, L. Calabretta, G. Costa, G. D’Agostino, G. Gallo, D. Rifuggiato, A.D. Russo, G. Torrisi
INFN/LNS, Catania, Italy

The upgrade of the Superconducting Cyclotron operating at INFN-LNS is the main objective of the general upgrade of the LNS facility, consisting in the enhancement of light ion beam intensity. To overcome the present maximum power of 100 W of the beam extracted by electrostatic deflector and achieve a beam power as high as 10 kW, the implementation of the extraction by stripping method has been proposed. Intense ion beams with mass in the range 10 to 40 amu (12C, 18O, 20Ne, 40Ar) in the energy range of interest (15-70 MeV/u) will be delivered to the NUMEN experiment, as well as used for production of in-flight radioactive beams. The present work consists in the optimization of the magnetic channels needed to limit the radial and axial beam envelopes. The design of the magnetic channels has been accomplished by fully three-dimensional magneto-static simulations using Comsol Multiphysics and a custom transport code developed in Matlab along the last year at INFN-LNS. The effect of a magnetic shielding structure in the extraction channel is presented, together with the possibility of producing a magnetic gradient from an asymmetric coil.

Poster MOP014 [2.968 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP014

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

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MOP016

Vertical Focussing with a Field Gradient Spiral Inflector

58

A.H. Barnard, J.I. Broodryk, J.L. Conradie, J.G. De Villiers, J. Mira, F. Nemulodi, R.W. Thomae
iThemba LABS, Somerset West, South Africa

Traditional spiral inflectors suffer from vertical defocussing, leading to beam loss. In this study the electrode shape of an inflector is modified to intentionally produce transverse electric field gradients, which have a significant influence on the optics. This is done by placing the traditionally parallel electrodes at an angle relative to each other in the transverse plane, creating a quadrupole field on the central path. Varying the electrode angle along the path length creates an alternating-gradient effect. The electrode entrance and exit faces are also shaped to create quadrupoles inside the fringe field. By numerical optimisation a design with good vertical focussing is obtained. Experiments show a roughly 100% increase in transmission in cases where the buncher is turned off. However, high losses at extraction are observed with the buncher turned on, due to RF-phase spread introduced by longitudinal defocussing in the inflector. This results in an improvement of only 20% during normal cyclotron operation, and shows that an inflector should ideally focus vertically and longitudinally at the same time. Ongoing work to achieve such combined focussing is described.

Poster MOP016 [1.410 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP016

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

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MOP017

Research on Metallic Ion Beam Production With Electron Cyclotron Resonance Ion Sources

62

S.L. Bogomolov, A.A. Efremov, K.I. Kuzmenkov, D.K. Pugachev, Yu. Yazvitsky
JINR, Dubna, Moscow Region, Russia
J.L. Conradie, D.T. Fourie, N.Y. Kheswa, J. Mira, F. Nemulodi, R.W. Thomae
iThemba LABS, Somerset West, South Africa

Many experiments in nuclear physics request the production of metallic ion beams. All elements from lithium up to uranium are of interest and most of them are required as a specific isotope which demands commonly enriched materials. Depending on the material properties beams of rare isotopes can be produced from solid materials or solid compounds. In this report the results of experiments carried out under a collaboration of JINR and iThemba LABS on the production of metallic ions from Electron Cyclotron Resonance Ion Sources (ECRIS) using resistive oven evaporation, Metal Ions from VOlatile Compounds (MIVOC) method and sputtering technique will be presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP017

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paper received ※ 11 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020

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MOP018

Simulation of the Axial Injection Beam Line of DC140 Cyclotron of FLNR JINR

66

N.Yu. Kazarinov, J. Franko, G.G. Gulbekyan, I.A. Ivanenkopresenter, I.V. Kalagin
JINR, Dubna, Moscow Region, Russia

Flerov Laboratory of Nuclear Reaction of Joint Institute for Nuclear Research carries out the works under creating FLNR JINR Irradiation Facility based on the cyclotron DC140. The facility is intended for SEE testing of microchip, for production of track membranes and for solving of applied physics problems. The main systems of DC140 are based on the DC72 cyclotron ones that now are under reconstruction. The DC140 cyclotron is intended for acceleration of heavy ions with mass-to-charge ratio A/Z within interval from 5 to 5.5 up to two fixed energies 2.136 and 4.8 MeV per unit mass. The intensity of the accelerated ions will be about 1 pµAmps for light ions (A<86) and about 0.1 pµAmps for heavier ions (A>132). The injection into cyclotron will be realized from the external room temperature 18 GHz ECR ion source. The simulation of the axial injection system of the cyclotron is presented in this report.

Poster MOP018 [1.331 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP018

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paper received ※ 29 August 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020

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MOP019

The Results of Magnetic Field Formation and Commissioning of Heavy-Ion Isochronous Cyclotron DC280

70

I.A. Ivanenko, G.G. Gulbekyan, G.N. Ivanov, I.V. Kalagin, V.A. Semin
JINR, Dubna, Moscow Region, Russia

The DC280 cyclotron is the new accelerator of FLNR Super Heavy Elements Factory. It was commissioned in the beginning of 2019. DC280 is intended for production of high intensity, up to 10 pmkA, beams of heavy ions with mass to charge ratio A/Z= 4 - 7. The wide range of accelerated ions from helium to uranium and smooth variation of extracted beam energy in the range W= 4 - 8 MeV/n are provided by varying of level of main magnetic field from 0.64 T till 1.32 T. The DC280 magnetic field was formed in a good conformity with results of computer modeling. In spite of commissioning of cyclotron still is in progress, the first experiments gave the intensity 1.35 pmkA of 84Kr¹⁴⁺ and 10 pmkA of 12C²⁺. At the present work the results of calculations, magnetic field measurements and first experiments are presented.

Poster MOP019 [1.368 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP019

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paper received ※ 12 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020

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MOP020

Simulation of the Beam Extraction System of DC140 Cyclotron of FLNR JINR

73

N.Yu. Kazarinov, G.G. Gulbekyan, I.A. Ivanenkopresenter
JINR, Dubna, Moscow Region, Russia

Flerov Laboratory of Nuclear Reaction of Joint Institute for Nuclear Research carries out the works under creating FLNR JINR Irradiation Facility based on the cyclotron DC140. The facility is intended for SEE testing of microchip, for production of track membranes and for solving of applied physics problems. The main systems of DC140 are based on the DC72 cyclotron ones that now are under reconstruction. The DC140 cyclotron is intended for acceleration of heavy ions with mass-to-charge ratio A/Z within interval from 5 to 5.5 up to two fixed energies 2.136 and 4.8 MeV per unit mass. The intensity of the accelerated ions will be about 1 pµAmps for light ions (A<86) and about 0.1 pµAmps for heavier ions (A>132). The beam extraction system consists of electrostatic deflector and two magnetic channels. The simulation of the extraction system of the cyclotron is presented in this report. The extracted beams characteristics outside the cyclotron, that will serve as initial conditions for the design of experimental beam lines of FLNR JINR IF are determined.

Poster MOP020 [9.336 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP020

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paper received ※ 29 August 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020

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MOP021

Simulation of Beam Extraction from TR24 Cyclotron at IPHC

76

N.Yu. Kazarinov, I.A. Ivanenkopresenter
JINR, Dubna, Moscow Region, Russia
T. Adam, F.R. Osswald, E.K. Traykov
IPHC, Strasbourg Cedex 2, France

The CYRCé (CYclotron pour la ReCherche et Enseignement) TR24 cyclotron is used at IPHC (Institut Pluridisciplinaire Hubert Curien) for the production of radio-isotopes for diagnostics, medical treatments and fundamental research in radiobiology. The TR24 cyclotron produced and commercialized by ACSI delivers a 16-25 MeV proton beam with intensity from few nA up to 500 µA. The TR24 is a compact isochronous cyclotron with normal-conducting magnet and stripper foil for the beam extraction. The calculation model for OPERA 3D program code is described. The magnetic field map in the working region of the cyclotron is generated. The beam characteristics outside the cyclotron, that will serve as initial conditions for the design of future beam lines are determined.

Poster MOP021 [15.509 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP021

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paper received ※ 29 August 2019 paper accepted ※ 24 September 2019 issue date ※ 20 June 2020

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MOP022

Project of a Novel Multi-Orbital Beam Bunching and Extraction from the U-120M Cyclotron

80

M. Čihák, R. Běhal, P. Kristpresenter, T. Matlocha, J. Stursa, V. Zach
NPI, Řež near Prague, Czech Republic

We introduce the bunching system for a time structure control of the U-120M cyclotron beam. The system is based on a unique pulsed vertical deflection of the selected final orbits of the internal accelerated beam of the H⁻ ions to an extractor-stripper (a thin carbon foil positioned below the cyclotron median plane). A set of home-made programs have been developed for simulations and parameters determination of the system. Results of some simulations (i.e. dimensions of the deflection system, parameters of the pulsed high voltage power supply, position of the stripper, beam trajectories, beam parameters, beam losses, Be target position etc.) are presented. The system will be used for fast neutron generation and consequently for spectrometric measurement of neutron energy by the time of flight (ToF) method. The system will provide beam bunch interval up to 1000 ns range of a defined beam time structure (up to beam bunch period to beam bunch width ratio min 100).

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP022

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

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MOP023

Synchronization and High Speed High Voltage Switcher for Pulse Bunching System of the Cyclotron U-120M

83

P. Krist, D. Pokloppresenter, J. Stursa
NPI, Řež near Prague, Czech Republic
V. Cervenka
HiLASE Centre, Institute of Physics ASCR, v.v.i., Dolní BřeÂany, Czech Republic
J. Vozáb
Radan s.r.o., Barchov, Czech Republic

Pulse bunching system for neutron time of flight (ToF) measurements on the cyclotron U-120M exploits a unique pulsed vertical deflection of the selected final orbits of the internal accelerated beam of the H⁻ ions to an extractor-stripper. This system is described in details on an individual poster of this conference. A key device is the pulse HV power supply (HV switcher) which is supplying the deflector and elevates H⁻ ions in defined time structure to an extractor-stripper. The developed HV switcher is based on the SiC MOSFET transistors. It can provide HV pulses with the following pulse parameters: amplitude up to 13 kV, front edge less than 20 ns, flat top 20 ns, back edge less than 20 ns and repetition frequency up to several hundred of kHz. We have also developed the pulse synchronization with the cyclotron RF (25 MHz), which enables to set up front edge of bunching pulses within 2pi with accuracy 80 ps. Human-machine interface is based on SCADA software Reliance and PLC Tecomat Foxtrot. The time waveforms of the real pulses are part of the presentation.

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP023

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paper received ※ 15 September 2019 paper accepted ※ 25 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

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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MOP025

Fast Recharging of Electrostatic Injection and Extraction Septa After Breakdown

90

R. Dölling
PSI, Villigen PSI, Switzerland
J. Brutscher
Private Address, Dresden, Germany

We propose to recharge an electrostatic injection or extraction septum in a high-power cyclotron fast enough to omit the need for switching off the beam at a high voltage breakdown.

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP025

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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

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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MOP029

Design and Manufacture of 10 kW, 83.2 MHz 4-way Power Combiner for Solid State Amplifier

97

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

The purpose of this study is to improve the insertion loss of a 20 kW solid-state RF power amplifier and the power coupling efficiency by reducing reflected power. For this purpose, a power combiner, which is a core component of a solid-state RF power amplifier, was designed and fabricated. The 4-way power combiner employs the Wilkinson type, which has excellent power coupling efficiency and isolation, and operates at 83.2 MHz. This paper covers the design and cold test results.

Poster MOP029 [1.396 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP029

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

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MOP030

RF measurement of SKKUCY-10 RF Cavity for Impedance Matching

100

J.C. Lee, J.-S. Chai, Kh.M. Gad, M. Ghergherehchi, D.H. Hapresenter, 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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MOP031

Design of High Sensitive Magnet and Beam Dynamics for AMS Cyclotron

103

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

To produce a carbon-14 for Accelerator Mass Spectrometry (AMS), AMS Cyclotron magnet was designed. For the AMS system, Cyclotron magnet has been required high mass resolution. In order to realize high mass resolution, the phase error is designed within ±10 and the mass resolution was 5000. We used CST particle studio and Cyclone for beam dynamics simulation of this cyclotron magnet. This paper describes the AMS cyclotron magnet and beam dynamics design.

Poster MOP031 [2.281 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP031

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

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MOP032

Control System in 10 MeV Cyclotron Based on IoT

106

M. Mohamadian, H. Afarideh, S. Babaee, H. Pashaei, N. Salmani
AUT, Tehran, Iran
M. Ghergherehchipresenter
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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MOP034

Beam Stripping Interactions Implemented in Cyclotrons with OPAL Simulation Code

109

P. Calvo, C. Oliver
CIEMAT, Madrid, Spain
A. Adelmann, M. Frey, A. Gsell, J. Snuverink
PSI, Villigen PSI, Switzerland

Beam transmission optimization and losses characterization, where beam stripping interactions are a key issue, play an important role in the design and operation of compact cyclotrons. A beam stripping model has been implemented in the three-dimensional object-oriented parallel code OPAL-cycl, a flavor of the OPAL framework. The model includes Monte Carlo methods for interaction with residual gas and dissociation by electromagnetic stripping. The model has been verified with theoretical models and it has been applied to the AMIT cyclotron according to design conditions.

Poster MOP034 [0.880 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP034

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paper received ※ 12 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020

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MOP035

Extraction Beam Orbit of a 250 MeV Superconducting Cyclotron

113

H.J. Zhang, K. Fan, Y. Yan
Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People’s Republic of China
Y.-N. Rao
TRIUMF, Vancouver, Canada
L.G. Zhang
HUST, Wuhan, People’s Republic of China

Funding: The work is supported by the National Nature Science Foundation of China (11775087).
A superconducting cyclotron based on proton therapy facility is being developed at Huazhong university of science and technology (HUST). Due to the compact size of the main magnet, the beam orbits at the extraction region are distributed densely, which creates difficulties for beam extraction leading to severe beam loss. In order to deal with these challenges, the orbit precession method has been employed in the extraction system design. In this paper, we introduce a method of employing a first harmonic field near the nu_r=1 resonance where the beam energy is about 248 MeV to adjust the amplitude of beam orbit oscillation. The optimum amplitude and phase of the first harmonic field are designed to obtain a large turn separation in the extraction region. Three different ways of generating the first harmonic field are compared for optimization.

Poster MOP035 [0.777 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP035

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

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MOP036

The Magnetic Field Design of Cyclotron at IMP

116

Q.G. Yao, B. Wang, B.M. Wu, W. Wu, L. Yang
IMP/CAS, Lanzhou, People’s Republic of China

A cyclotron magnet is studied at Institute of Modern Physics, Chinese Academy of Sciences (IMP, CAS), and the whole system include one main magnet and other magnetic gradient correctors, which is used to accelerate the Kr²⁶⁺ beam. The structure of superconducting coils and room-temperature iron core are adopted for the main magnet. This paper describes the magnetic field design of the cyclotron, and several shimming methods are used to meet the isochronous magnetic field of Kr²⁶⁺ beam, including pole face shimming method and side shimming method. The final optimization results show that the error between simulation and theory value is small. In addition, the magnet structure is also described.

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reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-MOP036

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paper received ※ 17 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020

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