Cyclotrons2019 - List of Keywords (MMI)

Paper	Title	Other Keywords	Page
MOP001	Design and Commissioning of RF System for SC200 Cyclotron	cavity, cyclotron, controls, 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
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP007	The Design and Calculation on the Injection and Central Region for CYCIAE-50	injection, cyclotron, ion-source, solenoid	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
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP011	Magnetic Field Measurement and Shimming for a Medical Compact Cyclotron	cyclotron, controls, proton, monitoring	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
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP019	The Results of Magnetic Field Formation and Commissioning of Heavy-Ion Isochronous Cyclotron DC280	cyclotron, operation, experiment, ECR	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
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP035	Extraction Beam Orbit of a 250 MeV Superconducting Cyclotron	extraction, cyclotron, resonance, proton	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
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP036	The Magnetic Field Design of Cyclotron at IMP	cyclotron, focusing, cryogenics, extraction	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
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP017	Manufacturing and Commissioning of Cyclotrons in a Series Production at Varian	cyclotron, extraction, radiation, proton	192
	O. Boldt, M. Eichel, S. Lucht, L. Netterdon, A. Roth, M. Seher, T. Stephani, M. Wiesner VMS-PT, Troisdorf, Germany
	On 16th March 2019, Varian celebrated the 10th anniversary of first patient treatment in the Munich Proton Center, Germany. Since the first cyclotron installation, 22 more 250 MeV superconducting isochronous proton cyclotrons have successfully been manufactured, commissioned, and tested in our Troisdorf production line. During this process, an increasing experience with the cyclotron’s internal mechanisms and underlying physics allowed for a nowadays significant faster commissioning lead time without having changed the hardware setup substantially. Furthermore, we can already verify full clinical performance of each cyclotron in the factory test cells before delivery to the customer. Essential improvements in the areas of qualification of magnetic field configuration, RF conditioning, and beam commissioning are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP017
About •	paper received ※ 15 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUC01	Review and Current Status of the 70 MeV High Intensity Proton Cyclotron at Legnaro	cyclotron, operation, target, proton	248
	M. Maggiore, P. Antonini, A. Lombardi, L. Pranovi INFN/LNL, Legnaro (PD), Italy Z. Filipovski UI PET, Skopje, Republic of North Macedonia
	In 2017 the new cyclotron has been successfully commissioned and started the operation at Laboratori Nazionali di Legnaro (LNL) of INFN . The cyclotron is the proton driver foreseen for the Selective Production of Exotic Species (SPES) project, providing the high power beam for radioactive ion beams (RIBs) production by the ISOL technique. The SPES facility is today under construction and first low energy RIBs are expected to be available on 2021. The facility has been designed in order to exploit the versatility of the cyclotron in terms of wide range of energy and beam current extracted: 35-70 MeV energy and 20 nA - 500 µA of average current. Moreover, the possibility to extract at the same time two proton beams allows to share these both for experimental physics session and applications. In particular, at LNL a collaboration between private company and public institution will lead to a profitable synergy in R&D of new radioisotopes and the related production. In the session the results of the commissioning and the operation of cyclotron will be presented as well as the description of the SPES facility together with its potentiality in nuclear physics research and applications.
	Slides TUC01 [14.176 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUC01
About •	paper received ※ 15 September 2019 paper accepted ※ 26 September 2019 issue date ※ 20 June 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRA03	Energy Reduction of Varian’s ProBeam 250 MeV Cyclotron to 226 MeV	cyclotron, extraction, proton, simulation	344
	A. Roth, E.M. Akcöltekin, O. Boldt, F. Klarner, H. Röcken, T. Stephani, J.C. Wittschen VMS-PT, Troisdorf, Germany
	With its superconducting 250 MeV isochronous proton cyclotron AC250, Varian uses a powerful accelerator for the ProBeam particle therapy systems. However, data from clinical operation has shown that the vast majority of treatments is only making use of proton ranges of less than 30 cm WET (water equivalent thickness), i.e. beam energy of 218 MeV at the patient. This led to a decision at Varian in Dec 2018 to conduct a redesign program with the goal to reduce extraction energy of the ProBeam cyclotron to 226 MeV. We present beam dynamics simulations for the AC226 beam acceleration and extraction. They actually show that only a reduced main coil current and adapted magnetic shimming process, as well as a slightly lower RF frequency is needed for re-tune. Furthermore, results indicate that a similar performance as compared to the AC250 can be expected. A first of its kind (FOIK) AC226 cyclotron is built by seamless integration into Varian’s production process. The magnetic field measurement and shimming is completed, in-house RF and beam commissioning is planned for autumn 2019. We report on the status of the FOIK machine.
	Slides FRA03 [4.697 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-FRA03
About •	paper received ※ 14 September 2019 paper accepted ※ 25 September 2019 issue date ※ 20 June 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOP001

Design and Commissioning of RF System for SC200 Cyclotron

cavity, cyclotron, controls, 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

Export •

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

MOP007

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

injection, cyclotron, ion-source, solenoid

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

Export •

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

MOP011

Magnetic Field Measurement and Shimming for a Medical Compact Cyclotron

cyclotron, controls, proton, monitoring

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

Export •

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

MOP019

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

cyclotron, operation, experiment, ECR

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

Export •

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

MOP035

Extraction Beam Orbit of a 250 MeV Superconducting Cyclotron

extraction, cyclotron, resonance, proton

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

Export •

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

MOP036

The Magnetic Field Design of Cyclotron at IMP

cyclotron, focusing, cryogenics, extraction

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

Export •

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

TUP017

Manufacturing and Commissioning of Cyclotrons in a Series Production at Varian

cyclotron, extraction, radiation, proton

192

O. Boldt, M. Eichel, S. Lucht, L. Netterdon, A. Roth, M. Seher, T. Stephani, M. Wiesner
VMS-PT, Troisdorf, Germany

On 16th March 2019, Varian celebrated the 10th anniversary of first patient treatment in the Munich Proton Center, Germany. Since the first cyclotron installation, 22 more 250 MeV superconducting isochronous proton cyclotrons have successfully been manufactured, commissioned, and tested in our Troisdorf production line. During this process, an increasing experience with the cyclotron’s internal mechanisms and underlying physics allowed for a nowadays significant faster commissioning lead time without having changed the hardware setup substantially. Furthermore, we can already verify full clinical performance of each cyclotron in the factory test cells before delivery to the customer. Essential improvements in the areas of qualification of magnetic field configuration, RF conditioning, and beam commissioning are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUP017

About •

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

Export •

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

TUC01

Review and Current Status of the 70 MeV High Intensity Proton Cyclotron at Legnaro

cyclotron, operation, target, proton

248

M. Maggiore, P. Antonini, A. Lombardi, L. Pranovi
INFN/LNL, Legnaro (PD), Italy
Z. Filipovski
UI PET, Skopje, Republic of North Macedonia

In 2017 the new cyclotron has been successfully commissioned and started the operation at Laboratori Nazionali di Legnaro (LNL) of INFN . The cyclotron is the proton driver foreseen for the Selective Production of Exotic Species (SPES) project, providing the high power beam for radioactive ion beams (RIBs) production by the ISOL technique. The SPES facility is today under construction and first low energy RIBs are expected to be available on 2021. The facility has been designed in order to exploit the versatility of the cyclotron in terms of wide range of energy and beam current extracted: 35-70 MeV energy and 20 nA - 500 µA of average current. Moreover, the possibility to extract at the same time two proton beams allows to share these both for experimental physics session and applications. In particular, at LNL a collaboration between private company and public institution will lead to a profitable synergy in R&D of new radioisotopes and the related production. In the session the results of the commissioning and the operation of cyclotron will be presented as well as the description of the SPES facility together with its potentiality in nuclear physics research and applications.

Slides TUC01 [14.176 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-TUC01

About •

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

Export •

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

FRA03

Energy Reduction of Varian’s ProBeam 250 MeV Cyclotron to 226 MeV

cyclotron, extraction, proton, simulation

344

A. Roth, E.M. Akcöltekin, O. Boldt, F. Klarner, H. Röcken, T. Stephani, J.C. Wittschen
VMS-PT, Troisdorf, Germany

With its superconducting 250 MeV isochronous proton cyclotron AC250, Varian uses a powerful accelerator for the ProBeam particle therapy systems. However, data from clinical operation has shown that the vast majority of treatments is only making use of proton ranges of less than 30 cm WET (water equivalent thickness), i.e. beam energy of 218 MeV at the patient. This led to a decision at Varian in Dec 2018 to conduct a redesign program with the goal to reduce extraction energy of the ProBeam cyclotron to 226 MeV. We present beam dynamics simulations for the AC226 beam acceleration and extraction. They actually show that only a reduced main coil current and adapted magnetic shimming process, as well as a slightly lower RF frequency is needed for re-tune. Furthermore, results indicate that a similar performance as compared to the AC250 can be expected. A first of its kind (FOIK) AC226 cyclotron is built by seamless integration into Varian’s production process. The magnetic field measurement and shimming is completed, in-house RF and beam commissioning is planned for autumn 2019. We report on the status of the FOIK machine.

Slides FRA03 [4.697 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-FRA03

About •

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

Export •

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