Cyclotrons2016 - List of Keywords (cavity)

Paper	Title	Other Keywords	Page
MODM03	Equivalent Circuit Model of Cyclotron RF System	cyclotron, resonance, simulation, impedance	39
	M. Mohamadian, H. Afarideh, S. Sabounchi, M. Salehi AUT, Tehran, Iran M. Ghergherehchi SKKU, Suwon, Republic of Korea
	Cyclotron cavity modeled via electromagnetic circuits in the desired frequency. The design performed according to resonator basis and also cyclotron acceleration requirements with ADS software and compared to simulations made by the CST microwave studio. The scattering parameters obtained for main resonators of the cyclotron and Dee parts as a diaphragm for each of cavity sections and also for the whole structure. All the characteristics modeled and calculated by the electromagnetic rules and theory of resonators from circuit model. Then it analysed with numerical methods for bench-marking. Finally, it shows that the circuit model able to modeled accurately the cyclotron cavity and especially it can estimate precisely the structure parameters without any time consuming numerical method simulations.
	Poster MODM03 [1.475 MB]
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TUP06	Design of the Cyclone®70p	cyclotron, vacuum, proton, acceleration	175
	S. Zaremba, M. Abs, J.L. Delvaux, W.J.G.M. Kleeven, B. Nactergal, V. Nuttens, J. van de Walle IBA, Louvain-la-Neuve, Belgium
	The IBA CYCLONE®70p is a high intensity 70 MeV proton-only cyclotron dedicated to the production of radioisotopes for PET generators and SPECT. The nominal power of the extracted beam goes above 50kW (750μA@70MeV). The proton-only cyclotron was developed based on the previous experience of the multi-particle Cyclone® 70XP running in Nantes, France. Numerical tools have been extensively used to optimize the magnetic field, to avoid potentially harmful resonances during acceleration and improve the acceleration efficiency of the cyclotron. In addition, electromagnetic and mechanical calculations permitted to obtain a low dissipated power and electromechanically robust design of the RF system. The vacuum computations have permitted to optimize the beam transmission, the placement and type of cryopumps. This new development of CYCLONE®70p was the initial part of the successfully finished IBA project also presented during this conference [1].
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TUP17	Preliminary Design of RF System for SC200 Superconducting Cyclotron	coupling, proton, cyclotron, simulation	208
	G. Chen, Y.F. Bi, C. Chao, Y. Chen, K.Z. Ding, H. Feng, Y. Song, S.Y. Wang, M. Xu, Q. Yang, X. Zhang, J. Zheng, J. Zhou ASIPP, Hefei, People's Republic of China O. Karamyshev, G.A. Karamysheva, N.A. Morozov, E.V. Samsonov, G. Shirkov JINR, Dubna, Moscow Region, Russia
	The SC200 is a compact superconducting cyclotron, which is designed under the collaboration of ASIPP (Hefei, China)-JINR (Dubna, Russia), for proton therapy. The protons are accelerated to 200 Mev with maximum beam current of 500 nA. The very high mean magnetic field of 2.9T-3.5T (center-extraction) challenges the design of radio frequency (RF) system because of the restricted space. The orbital frequency of the protons is ~45 MHz according to the magnetic field and beam dynamics. The RF system is supposed to operate on 2rd harmonic of ~90 MHz. Two Dee cavities located at the valley of the magnet have been adopted. The preliminary design of RF system, which consists of active tuning, coupling and so on, is presented. The computation and simulation showed good results to ensure the Dee cavities operating at the 2rd harmonic and the proper variation of acceleration voltage versus radius.
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TUP27	The Design of the Medical Cyclotron RF Cavity	cyclotron, simulation, extraction, ion	227
	X.W. Wang, F. Yong, R. Zhang IMP/CAS, Lanzhou, People's Republic of China
	In the cyclotron, RF system as an essential component provides energy for the ions is accelerated. However, the RF cavity is the most important equipment which produced the accelerating field. According to the physical requirements, RF cavity, the resonant frequency of that is 31.02 MHz, was designed in the paper.
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WEB03	Design and Simulation of Cavity for 18 MeV Cyclotron	coupling, cyclotron, simulation, impedance	267
	M. Mousavinia, H. Afarideh AUT, Tehran, Iran M. Ghergherehchi SKKU, Suwon, Republic of Korea
	RF system is the key part of cyclotron and cavity is the key part of RF system. The basic parameters of cavity design are the resonant frequency , dee voltage , RF phase and RF power. Proper operation of cavity depends on the suitable voltage distribution in accelerating gap, phase stability in cavity and as well as optimal scattering parameters. In this simulation by using CST MWS, different parts of cavity such as stam and dee are optimized to achieved optimum dimesnsions for desired resonant freq, dee voltage and RF power. Properties of designed cavity including: resonant frequency at 64.3 MHz, dee voltage is 45 kV and RF power is 11 kW.
	Slides WEB03 [3.767 MB]
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THP14	Design of RF Pick-up for the Cyclotron	pick-up, cyclotron, resonance, simulation	336
	D.H. Ha, J.-S. Chai, M. Ghergherehchi, H.S. Kim, J.C. Lee, S.C. Mun, H. Namgoong, S. Shin SKKU, Suwon, Republic of Korea
	The radio-frequency (RF) pick-up for RFT-30 cyclotron which was located in the Korea Atomic Energy Research Institute (KAERI) was designed by Sungkyunkwan University in Korea. This paper covers proper position of RF pick-up and things to consider when designing. Our RF pick-up antenna is designed for RFT-30, but approach to design process can be used any RF pick-up antenna design. This paper provide some tendency graph according to position of RF pick-up.
	Poster THP14 [2.010 MB]
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THP18	Suppression of RF Radiation Originating from the Flattop Cavity in the PSI Ring Cyclotron	flattop, vacuum, cyclotron, pick-up	348
	M. Schneider, A. Adelmann, N. Pogue, L. Stingelin PSI, Villigen PSI, Switzerland
	In the PSI Ring cyclotron, protons are accelerated from 72 MeV to 590 MeV. In several upgrade programs, the beam current was increased from the initial design value of 100 μA up to 2.4 mA. The rf-system of this separated sector cyclotron consists of 4 copper cavities running at 50 MHz for the main acceleration. For the purpose of increasing the phase acceptance of the Ring, an aluminum flattop cavity is operated at a gap voltage of 555 kVp at the 3rd harmonic frequency. As a result of the progressively increased flattop voltage, this cavity was pushed toward its mechanical and electrical limits. As a consequence rf-power is leaking into the cyclotrons vacuum chamber, which in turn caused several problems. A visible effect was the formation of plasma in the vacuum chamber . In the last shutdown, an attempt was made to reduce the radiated rf-power. On the vacuum sealing between the flattop cavity and sector magnet 6, a shim was installed which reduces the gap for the beam from 60mm to 25mm in height. Results of this intervention will be presented and compared with finite element model simulations . N.J. Pogue et al. NIM-A: Volume 821, 11 June 2016, pp. 87 - 92. ** N.J. Pogue et al. NIM-A: Volume 828, 21 August 2016, pp. 156 - 162.
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Paper

Title

Other Keywords

Page

MODM03

Equivalent Circuit Model of Cyclotron RF System

cyclotron, resonance, simulation, impedance

39

M. Mohamadian, H. Afarideh, S. Sabounchi, M. Salehi
AUT, Tehran, Iran
M. Ghergherehchi
SKKU, Suwon, Republic of Korea

Cyclotron cavity modeled via electromagnetic circuits in the desired frequency. The design performed according to resonator basis and also cyclotron acceleration requirements with ADS software and compared to simulations made by the CST microwave studio. The scattering parameters obtained for main resonators of the cyclotron and Dee parts as a diaphragm for each of cavity sections and also for the whole structure. All the characteristics modeled and calculated by the electromagnetic rules and theory of resonators from circuit model. Then it analysed with numerical methods for bench-marking. Finally, it shows that the circuit model able to modeled accurately the cyclotron cavity and especially it can estimate precisely the structure parameters without any time consuming numerical method simulations.

Poster MODM03 [1.475 MB]

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

TUP06

Design of the Cyclone®70p

cyclotron, vacuum, proton, acceleration

175

S. Zaremba, M. Abs, J.L. Delvaux, W.J.G.M. Kleeven, B. Nactergal, V. Nuttens, J. van de Walle
IBA, Louvain-la-Neuve, Belgium

The IBA CYCLONE®70p is a high intensity 70 MeV proton-only cyclotron dedicated to the production of radioisotopes for PET generators and SPECT. The nominal power of the extracted beam goes above 50kW (750μA@70MeV). The proton-only cyclotron was developed based on the previous experience of the multi-particle Cyclone® 70XP running in Nantes, France. Numerical tools have been extensively used to optimize the magnetic field, to avoid potentially harmful resonances during acceleration and improve the acceleration efficiency of the cyclotron. In addition, electromagnetic and mechanical calculations permitted to obtain a low dissipated power and electromechanically robust design of the RF system. The vacuum computations have permitted to optimize the beam transmission, the placement and type of cryopumps. This new development of CYCLONE®70p was the initial part of the successfully finished IBA project also presented during this conference [1].

Export •

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

TUP17

Preliminary Design of RF System for SC200 Superconducting Cyclotron

coupling, proton, cyclotron, simulation

208

G. Chen, Y.F. Bi, C. Chao, Y. Chen, K.Z. Ding, H. Feng, Y. Song, S.Y. Wang, M. Xu, Q. Yang, X. Zhang, J. Zheng, J. Zhou
ASIPP, Hefei, People's Republic of China
O. Karamyshev, G.A. Karamysheva, N.A. Morozov, E.V. Samsonov, G. Shirkov
JINR, Dubna, Moscow Region, Russia

The SC200 is a compact superconducting cyclotron, which is designed under the collaboration of ASIPP (Hefei, China)-JINR (Dubna, Russia), for proton therapy. The protons are accelerated to 200 Mev with maximum beam current of 500 nA. The very high mean magnetic field of 2.9T-3.5T (center-extraction) challenges the design of radio frequency (RF) system because of the restricted space. The orbital frequency of the protons is ~45 MHz according to the magnetic field and beam dynamics. The RF system is supposed to operate on 2rd harmonic of ~90 MHz. Two Dee cavities located at the valley of the magnet have been adopted. The preliminary design of RF system, which consists of active tuning, coupling and so on, is presented. The computation and simulation showed good results to ensure the Dee cavities operating at the 2rd harmonic and the proper variation of acceleration voltage versus radius.

Export •

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

TUP27

The Design of the Medical Cyclotron RF Cavity

cyclotron, simulation, extraction, ion

227

X.W. Wang, F. Yong, R. Zhang
IMP/CAS, Lanzhou, People's Republic of China

In the cyclotron, RF system as an essential component provides energy for the ions is accelerated. However, the RF cavity is the most important equipment which produced the accelerating field. According to the physical requirements, RF cavity, the resonant frequency of that is 31.02 MHz, was designed in the paper.

Export •

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

WEB03

Design and Simulation of Cavity for 18 MeV Cyclotron

coupling, cyclotron, simulation, impedance

267

M. Mousavinia, H. Afarideh
AUT, Tehran, Iran
M. Ghergherehchi
SKKU, Suwon, Republic of Korea

RF system is the key part of cyclotron and cavity is the key part of RF system. The basic parameters of cavity design are the resonant frequency , dee voltage , RF phase and RF power. Proper operation of cavity depends on the suitable voltage distribution in accelerating gap, phase stability in cavity and as well as optimal scattering parameters. In this simulation by using CST MWS, different parts of cavity such as stam and dee are optimized to achieved optimum dimesnsions for desired resonant freq, dee voltage and RF power. Properties of designed cavity including: resonant frequency at 64.3 MHz, dee voltage is 45 kV and RF power is 11 kW.

Slides WEB03 [3.767 MB]

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THP14

Design of RF Pick-up for the Cyclotron

pick-up, cyclotron, resonance, simulation

336

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

The radio-frequency (RF) pick-up for RFT-30 cyclotron which was located in the Korea Atomic Energy Research Institute (KAERI) was designed by Sungkyunkwan University in Korea. This paper covers proper position of RF pick-up and things to consider when designing. Our RF pick-up antenna is designed for RFT-30, but approach to design process can be used any RF pick-up antenna design. This paper provide some tendency graph according to position of RF pick-up.

Poster THP14 [2.010 MB]

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THP18

Suppression of RF Radiation Originating from the Flattop Cavity in the PSI Ring Cyclotron

flattop, vacuum, cyclotron, pick-up

348

M. Schneider, A. Adelmann, N. Pogue, L. Stingelin
PSI, Villigen PSI, Switzerland

In the PSI Ring cyclotron, protons are accelerated from 72 MeV to 590 MeV. In several upgrade programs, the beam current was increased from the initial design value of 100 μA up to 2.4 mA. The rf-system of this separated sector cyclotron consists of 4 copper cavities running at 50 MHz for the main acceleration. For the purpose of increasing the phase acceptance of the Ring, an aluminum flattop cavity is operated at a gap voltage of 555 kVp at the 3rd harmonic frequency. As a result of the progressively increased flattop voltage, this cavity was pushed toward its mechanical and electrical limits. As a consequence rf-power is leaking into the cyclotrons vacuum chamber, which in turn caused several problems. A visible effect was the formation of plasma in the vacuum chamber *. In the last shutdown, an attempt was made to reduce the radiated rf-power. On the vacuum sealing between the flattop cavity and sector magnet 6, a shim was installed which reduces the gap for the beam from 60mm to 25mm in height. Results of this intervention will be presented and compared with finite element model simulations **.
* N.J. Pogue et al.
NIM-A: Volume 821, 11 June 2016, pp. 87 - 92.
** N.J. Pogue et al.
NIM-A: Volume 828, 21 August 2016, pp. 156 - 162.

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