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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.
Coupler Matching Techniques for C-Band Accelerating Section
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
T. Sugimura, M. Ikeda, K. Kakihara, T. Kamitani, S. Ohsawa, T.T. Takatomi, K. Yokoyama, pp.2530-2532, TPPT038.
Development of C-band Accelerating Section for SuperKEKB
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
S. Michizono, S. Fukuda, T. Matsumoto, K. Nakao, T. Takenaka, K. Yoshida, pp.797-799.