| Paper |
Title |
Page |
| MPPP025 |
The Impedance of the Ceramic Chamber in J-PARC
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1898 |
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- Y. Shobuda
JAERI/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- Y.H. Chin, K. Ohmi, T. Toyama
KEK, Ibaraki
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The ceramic chamber is adopted at the RCS (rapid cycling synchrotron) in J-PARC. The copper stripes are on the outer surface of the chamber in order to shield the electro-magnetic field produced by the beam. The inner surface of the chamber is coated by TiN to suppress the secondary electron emission. In this paper, we calculate the strength of electro-magnetic field produced by the beam and evaluate the impedance of this ceramic chamber.
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| WPAT051 |
Development of Toshiba L-Band Multi-Beam Klystron for European XFEL Project
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3153 |
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- Y.H. Chin
KEK, Ibaraki
- S. Choroba
DESY, Hamburg
- M. Y. Miyake, Y. Yano
Toshiba, Yokohama
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A 10MW L-band multi-beam klystron (MBK)is under develpment at Toshiba, Japan for DESY X-FEL and a future linear collider projects. The design goals are to have 10MW peak power with 65% efficiency at 1.5 ms pulse length at 10Hz repetition rates. The Toshiba MBK has six low-perveance beams operated at low voltage of 115kV (for 10MW) to enable a higher efficiency than a single-beam klystron for a similar power. The prototyp·10-0 has been built and is now under testing. At the first step, it was tested without RF and operates stably at the cathode voltage of 115KV at 1.7ms pulse length at 10Hz repetition rate with beam transmission of better than 99%. No spurious oscillation was observed. The testing is now progressed with RF on. Up to date of November 10, 2004, The output power of 10.3MW has been demonstrated at the beam voltage of 115kV with efficinecy of 68.4% at the RF pulse length of 1ms at 10Hz. The testing is under way to increase the RF pulse length to the goal value of 1.5ms. This paper summarizes the design and the testing results.
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