| Paper |
Title |
Page |
| TUBX01 |
Impedance and radiation generated by a ceramic chamber with RF shields and TiN coating
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125 |
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- Y. H. Chin, S. Lee, K. Takata, T. Toyama
KEK, Ibaraki
- Y. Shobuda
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- H. Tsutsui
SHI, Tokyo
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In the RCS (Rapid Cycle Synchrotron) ring of J-PARC, we use ceramic chambers with the interior TiN coating and exterior Cu RF shields in the magnet sections. A new theory has been developed for calculation of impedance in this unusual configuration. When it was applied to a prototype RCS ceramic chamber, the calculation results got good agreement with the measurement results. We also considered the dipole radiation from gaps between Cu shields of the ceramic chamber in the bending magnets. The effects turn out to be rather small thanks to the special configuration of the ceramic chambers. We measured the radiation from a ceramic break with and without RF shields and capacitors in the KEK, PS and found that the RF shields with capacitors considerably suppress the radiation from the ceramic break. We summarize all these studies in this paper.
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| TUBZ01 |
The Beam Diagnostics System for J-PARC Synchrotrons
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128 |
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- N. Hayashi, S. H. Hiroki, K. Satou, R. Toyokawa
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- D. A. Arakawa, Y. Hashimoto, S. Lee, T. Miura, T. Toyama
KEK, Ibaraki
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The beam diagnostics system for J-PARC synchrotrons (RCS and MR) will be presented. The design of the system will be described for high current machines. Some test results will be reported.
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| THBZ02 |
Commissioning strategies for J-PARC linac and L3BT
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347 |
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- M. Ikegami, S. Lee
KEK, Ibaraki
- Y. Kondo, T. Ohkawa
JAEA, Ibaraki-ken
- A. Ueno
JAEA/LINAC, Ibaraki-ken
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We plan to start the beam commissioning of J-PARC linac with reduced energy of 181 MeV in the end of this year. Detailed commissioning strategies for the linac and the succeeding beam transport line, to which we refer as L3BT or Linac-to-3-GeV-synchrotron Beam Transport, will be presented in this talk. The emphasis will be put on the commissioning procedures for two debuncher cavities and a transverse collimator system located in L3BT, because they are key elements in determining the final beam quality at the injection point to the succeeding 3-GeV synchrotron. The unique design and features of the collimator system are also presented.
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