Paper |
Title |
Page |
WPAT052 |
Present Status of RF System for Medical Proton Synchrotron
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3185 |
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- Z. Fang, K. Egawa, K. Endo, S. Yamanaka
KEK, Ibaraki
- Y. Cho, T. Fusato, T. Hirashima
DKK, Kanagawa
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The 200MeV proton synchrotron of circumference of 9.54m is being developed for medical radiotherapy. The rf system has been carried out with a wide bandwidth of frequency sweeping from 2.0MHz to 17.8MHz. The rf cavity is designed of a compact dimension and a high acceleration gradient. The high power test of the rf system has been successfully performed and maximal acceleration gradient of 60kV/m has been achieved. The experiments with feedback control system are being studied by using a dummy beam signal. In this paper, the recent progress of the rf system and test results will be presented in detail.
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WPAE071 |
Power Supply for Magnet of Compact Proton and/or Heavy Ion Synchrotron for Radiotherapy
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3859 |
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- S. Yamanaka
NIRS, Chiba-shi
- K. Egawa, K. Endo, Z. Fang
KEK, Ibaraki
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A resonant type pulse power supply, for an application to a compact proton and/or heavy ion synchrotron with a several Hz repetition rate, is attractive from the view point of attaining an average beam current that is enough for the radiation therapy. Maximum ampere-turn of the dipole magnet is as large as 200 kAT to make the bending radius as small as possible. Pulse current is generated by discharging the stored energy in a capacitor bank through a pulse transformer. Moreover, the auxiliary power supply for the dipole magnets which adds the flat magnetic field (10-20μs) for the multi-turn beam-injection is being developed. The power supply for the quadrupole magnets is the high switching frequency (20 kHz × 5) switching-mode Power Supply for the adjusting tune and the tracking between the quadrupole and the dipole fields.Detailed analyses on these pulse power supplies will be presented.
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RPAP032 |
Hardware Tracking Related to Compact Medical Pulse Synchrotron
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2260 |
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- K. Endo, K. Egawa, Z. Fang
KEK, Ibaraki
- S. Yamanaka
NIRS, Chiba-shi
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A compact 200 MeV proton synchrotron for the radiotherapy is being developed. Dipole and quadrupole magnets were already manufactured and are ready to measure their field properties under the pulse excitation. Preliminary field measurement was already done on the prototype dipole. Small RF cavity with a wide bandwidth (2~18 MHz) was successfully developed. Concerning to the simultaneous pulse operation of these components, there are some issues to be solved beforehand. These are the tracking between dipole field and the quadruple field gradient, the RF frequency generation sensing the dipole current (or field), the sextupole field correction of the dipole and etc. These issues studied experimentally using the dipole current will be presented in conjunction with the progress of the development.
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