Proceedings of the 5th Annual Meeting of Particle Accelerator Society of Japanand the 33rd Linear Accelerator Meeting in Japan (August 6-8, 2008, Higashihiroshima, Japan)

STATUS OF THE ACS CAVITY DEVELOPMENT FOR THE J-PARC
LINAC ENERGY UPGRADEA)

A)

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A)

B)

Hiroyuki Ao 1 , Koichiro Hirano , Takatoshi Morishita , Hiroyuki Asano , Fujio Naito ,A)
B)
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B)
C)
Akira Ueno , Masanori Ikegami , Kazuo Hasegawa , Yoshishige Yamazaki , Valentin Paramonov ,A)Japan Atomic Energy Agency, 2-4 Shrakata-shirane, Tokai, Naka, Ibaraki, 319-1195
B)High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki, 305-0801
C)
Institute for Nuclear Research, prospekt 60-letiya Oktyabrya 7a, Moscow
Abstract
The mass production of the J-PARC ACS requires about 1300 cell parts, so that it is important to reduce themachining time. In the previous ACS model, it took about three hours per one coupling slot. We, therefore, optimized
the slot design, the tolerance, and the machining process. As a result, the machining time reduced to forty-five minutes
per one slot. The four test cells were fabricated to measure the frequencies and Q-values, and these results werecompared with the electromagnetic analysis with the Microwave Studio. Between the analysis and the measurement, thedifferences are 1~1.5 MHz and 4~5 MHz, respectively, for the accelerating mode, and for the coupling mode.

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1E-mail: hiroyuki.ao@j-parc.jp-494-

Proceedings of the 5th Annual Meeting of Particle Accelerator Society of Japanand the 33rd Linear Accelerator Meeting in Japan (August 6-8, 2008, Higashihiroshima, Japan)

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