| Paper |
Title |
Page |
| TUPCH060 |
Beam Collimator System in the J-PARC 3-50BT Line
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1148 |
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- M.J. Shirakata, H. Oki, T. Oogoe, Y. Takeuchi, M. Yoshioka
KEK, Ibaraki
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For the J-PARC 50 GeV Main Ring Synchrotron (MR), the design beam emittance is 54 pi mm mrad. On the other hand, the 3 GeV beam from the Rapid Cycling Booster Synchrotron (RCS) may have a large halo component upto 216 pi mm mrad. In order to absorb the halo component, a beam collimator system will be installed in the beam transport line called as the 3-50BT, which connects the RCS and the MR. From the view of the hands-on maintenance, high endurance structure is adopted. The beam collimator design including the beam optics is reported in this paper.
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| TUPCH127 |
Fine Grooving of Conductor Surfaces of RF Input Coupler to Suppress Multipactoring
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1310 |
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- T. Abe, T. Kageyama, H. Sakai, Y. Takeuchi
KEK, Ibaraki
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An RF input coupler to feed high power into an accelerating cavity with heavy beam loading undergoes many multipactoring zones due to the wide range of the input RF power. Furthermore, a regular coaxial line is more subject to multipactoring than a rectangular waveguide because of the uniformity of the electromagnetic field. Grooving the conductor surfaces of the coaxial line is a promising method to suppress multipactoring under any conditions expected in the above cases. This paper reports results of our multipactoring simulation study and the high power test of the input coupler with a grooved coaxial line.
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| TUPCH126 |
Outgassing Rate of Highly Pure Copper Electroplating Applied to RF Cavities
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1307 |
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- T. Abe, T. Kageyama, Y. Saito, H. Sakai, Y. Sato, Y. Takeuchi
KEK, Ibaraki
- Z. Kabeya, T. Kawasumi
MHI, Nagoya
- T. Nakamura, S. Nishihashi, K. Tsujimoto
Asahi Kinzoku Co., Ltd., Gifu
- K. Tajiri
Churyo Engineering Co., Ltd., Nagoya
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We plan to apply a new copper electroplating with a high purity and a high electric conductivity to normal-conducting RF cavities for electron or positron storage rings with a high current beam. As reported in 2005 Particle Accelerator Conference, our first test cavity, made of iron, with the electroplated copper surface finished up by electropolishing showed an excellent electric performance compared with the case of cavities made of oxygen free copper. Our next step is to examine the vacuum performance. This paper reports results of the outgassing-rate measurements on our second test cavity together with its fabrication process.
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| THPCH172 |
Present Status of Beam Collimation System of J-PARC RCS
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3200 |
| |
- K. Yamamoto
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- M. Abe, H. Hanaue, A. Nakamura, Y. Takeuchi
VIC International Co., Ltd., Tokyo
- Y. Hirooka, M. Okazaki
Mitsui Engineering & Shipbuilding Co., Ltd., Tokyo
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The precedence manufacture of the two beam collimator was carried out. In these two sets, we tested the heat transfer capacity of cooling fins and remote clamp handling system. The vertical collimator was able to keep temperature under 120 degrees C by the design heat 400W, but in case of the horizontal collimator, it went over 200 degrees C by the design heat 700W. The design was changed towards adding an air duct. About remote clamp handling system, it checked that it could attach by the He leak below 5.*10-10Pa m3/sec as a result of the helium leak examination.
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