Overview
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From 2001 it was discussed to upgrade KEKB towards SuperKEKB, in which the energy of the positron ring was raised in order to avoid the electron cloud instability. It was called "an energy exchange". While the positron beam recirculation was one of the possible schemes, the new tunnel would be an obstacle. As a straightforward scheme, a replacement of a single S-band unit with two C-band units was developed. Laser, it was decided not to exchange the energies. And the SuperKEKB project was fixed with the electron and positron energies of 7 GeV and 4 GeV, respectively. And the C-band accelerating structure became unnecessary. Please send your comments and questions to K.Furukawa. |
KEK News
- News on 2003.10.16.
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The first electron acceleration with C-band structure
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- News on 2003.12.18.
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Building a compact accelerator
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Acceleration Gradient Measurement (without SKIP)
- Jun.29.2004. at Modulator voltage of 45kV (~47MW)
- Acceleration Gain: 40.98 MeV,
Structure Length: 0.962 m,
==> Acceleration Gradient: 42.6 MeV/m (preliminary) 
The First Acceleration Gradient Measurement with SKIP
- Oct.6.2004. at Modulator voltage of 28.56kV
- with SKIP (rf compressor)
- Acceleration Gain: 38.18 MeV,
Structure Length: 0.962 m,
==> Acceleration Gradient: 39.69 MeV/m (preliminary) 
Conditioning History in 2003
Schedule
- July 17, 2003.
- Start of Accelerating Structure Conditioning at Linac Assembly Room
- September 5, 2003.
- End of Conditioning at Linac Assembly Room
- Characteristics Measurement of Accelerating Structure
- September 11, 2003.
- Installation of Structure at Unit 44 in Main Linac
- Tuning of Modulator and Klystron
- Beggining October, 2003.
- Conditioning at Unit 44
- Middle October, 2003.
- First Beam Acceleration
- August, 2004.
- Installation/Conditioning of SKIP
- September 30, 2004.
- First Beam Acceleration with SKIP
- December, 2004.
- Installation of the Second Structure
Articles on High-Gradient Acceleration at KEKB Linac
- [ Pac2007 ]
Status of C-band Accelerator Module in the KEKB Injector Linac [pdf]
T. Kamitani, T. Sugimura, K. Yokoyama, T. Takatomi, K. Kakihara, S. Ohsawa, M. Ikeda, T. Higo, N. Kudoh, pp.2769-2771, THPMN027. - [ Linac2006 ]
Status of C-band Accelerating Section Development at the KEKB Injector Linac [pdf]
T. Kamitani, T. Sugimura, K. Yokoyama, T. Takatomi, K. Kakihara, S. Ohsawa, M. Ikeda, T. Higo, N. Kudoh, pp.788-790, THP087. - [ Pac2005 ]
R&D Status of C-Band Accelerating Section for SuperKEKB [pdf]
T. Kamitani, N. Delerue, M. Ikeda, K. Kakihara, S. Ohsawa, T. Oogoe, T. Sugimura, T.T. Takatomi, S. Yamaguchi, K. Yokoyama, Y. Hozumi, pp.1233-1235, TPPT011.Coupler Matching Techniques for C-Band Accelerating Section [pdf]
K. Yokoyama, M. Ikeda, K. Kakihara, T. Kamitani, S. Ohsawa, T. Sugimura, T.T. Takatomi, pp.1431-1433, TPPT015.Development of C-Band Accelerator Structure with Smooth Shape Couplers [pdf]
T. Sugimura, M. Ikeda, K. Kakihara, T. Kamitani, S. Ohsawa, T.T. Takatomi, K. Yokoyama, pp.2530-2532, TPPT038. - [ Linac2004 ]
Development of a C-band Accelerating Module for SUPERKEKB [pdf]
S. Ohsawa, M. Ikeda, K. Kakihara, T. Kamitani, T. Oogoe, T. Sugimura, S. Yamaguchi, K. Yokoyama, pp.124-126.Development of C-band Accelerating Section for SuperKEKB [pdf]
T. Kamitani, N. Delerue, M. Ikeda, K. Kakihara, S. Ohsawa, T. Oogoe, T. Sugimura, T. Takatomi, S. Yamaguchi, K. Yokoyama, pp.713-715.Development of C-band High-Power Mix-Mode RF Window [pdf]
S. Michizono, S. Fukuda, T. Matsumoto, K. Nakao, T. Takenaka, K. Yoshida, pp.797-799. - [ Pac2003 ]
R & D Status of C-Band Accelerator Unit for SuperKEKB [pdf]
T. Kamitani, T. Suwada, Linac Group, Commissioning Group, pp.1225-1227. - [ Linac2002 ]
Present Performance and Future Upgrade of the KEKB Electron Linac [pdf], [ohp/poster]
K. Furukawa, Linac Group, Commissioning Group, pp.382-384. - [ Epac2002 ]
KEKB Injector Linac Status Report and Future Upgrade [pdf], [poster]
T. Kamitani, Linac Group, pp.1088-1090. - Other Linac Papers