Proceedings of the 1st Annual Meeting of Particle Accelerator Society of Japanand the 29th Linear Accelerator Meeting in Japan (August 4 - 6, 2004, Funabashi Japan)

PRESENT STATUS OF THE C-BAND ACCELERATOR R & D
OF THE KEKB INJECTOR LINAC FOR SUPERKEKB PROJECT
T. Kamitani1, M. Akemoto, M. Ikeda, T. Oogoe, S. Ohsawa, Y. Ogawa, K. Kakihara, H. Katagiri, M. Satoh, T. Shidara,
A. Shirakawa, T. Sugimura, T. Suwada, T. Takenaka, K. Nakao, H. Nakajima, S. Fukuda, K. Furukawa, H. Honma,
T. Matsumoto, S. Michizono, Y. Yano, K. Yokoyama, M. Yoshida, A. Enomoto
Electron/Positron Linac, Accelerator Laboratory, KEK
1-1 Oho, Tsukuba, 305-0801, JapanAbstract
In the upgrade of the KEKB injector linac for the future project SuperKEKB, it is required to increase its positron
acceleration energy from 3.5 to 8.0 GeV. To achieve it by doubling the acceleration field gradient with C-band
accelerator module, R & D work of the C-band components is in progress. Since the report last year, long term
operation of the C-band module placed in the KEKB injector linac and beam acceleration study have been performed.
Developments of RF pulse compressor and second prototype accelerator section have been done. High power test of an
RF window using a resonant ring has also been done. Status of these activities is reported here.

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[1] “Expression of Interest in A High Luminosity Upgrade ofthe KEKB Collider and the Belle Detector”, By I.Abe, et.
al., Jan. 2002
http://www-kekb.kek.jp/SuperKEKB/home.html[2] ĨĎĲÚ+ù,0SuperKEKBµRJWRKEKďÔĶď Ô dw r iC z v µ 1 Proceedings of the28th Linear Accelerator Meeting in Japan, Tokai, July. 30August-1, 2003, p45-47[3] http://c-band.kek.jp/[4] ÕāĀÎ+ù,0SuperKEKBµRJWRCzvø£ĠR½ä1, þ46ø¦¡¹¬ĠĤ+
2003ĝ11·11-13ě+http://conference.kek.jp/sast03/[5] Ą Ē²¿ +ù,0 â³{ nď ¼RĚë OË¾ R
ÿ1, Proceedings of the 28th Linear Accelerator Meetingin Japan, Tokai, July 30 - August 1, 2003, p48-50.
[6] ėæĹ+ù,09zv-rin/vÇÜĞòRĠ1,Proceedings of the 28th Linear Accelerator
Meeting in Japan, Tokai, July 30 - August 1, 2003.
[7] T.Takenaka et al., "High Power test of C-band RF window
Using Resonant Ring",These proceedings.
[8] A. Fiebig, et al., "Design Consideration, Construction andPerformance of a SLED Type Radiofrequency Pulse
Compressor using very high Q Cylindrical Cavities",
CERN-PS/87-45, presented at 1987 Particle Accelerator
Conf., Wash., D.C., Mar 16-19, 1987
[9] HFSS vesion 8.5, ANSOFT, http://www.ansoft.com/

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