Ono, M.

Paper	Title	Page
MOACH06	KEKB Status	17
	Y.Funakoshi, T.Agho, K.Akai, K.Ebihara, K.Egawa, A.Enomoto, J.Flanagan, H.Fukuma, K.Furukawa, T.Furuya, J.Haba, S.Hiramatsu, T.Ieiri, N.Iida, H.Ikeda, T.Kageyama, S.Kamada, T.Kamitani, S.Kato, M.Kikuchi, E.Kikutani, H.Koiso, M.Masuzawa, T.Mimashi, A.Morita, T.T.Nakamura, K.Nakanishi, H.Nakayama, M.Nishiwaki, Y.Ogawa, K.Ohmi, Y.Ohnishi, N.Ohuchi, K.Oide, M.Ono, M.Shimada, M.Suetake, Y.Suetsugu, T.Sugimura, T.Suwada, M.Tawada, M.Tejima, M.Tobiyama, N.Tokuda, S.Uehara, S.Uno, N.Yamamoto, Y.Yamamoto, Y.Yano, K.Yokoyama, Ma.Yoshida, Mi.Yoshida, S.Yoshimoto, KEK, Japan F.Zimmermann visiting from CERN, Switzerland
	The KEKB status is described focusing on the beam operation with crab crossing. This report deals mainly with the beam dynamics issues with crab crossing. There is a large discrepancy between the beam-beam simulation and the experiment at the high bunch currents. We discuss causes of this discrepancy in detail.
TUACH04	Commissioning of Crab Cavity System	38
	K.Nakanishi, K.Hara, A.Honma, K.Hosoyama, A.Kabe, Y.Kojima, H.Nakai, K.Akai, K.Ebihara, T.Furuya, S.Mitsunobu, Y.Morita, M.Ono, Y.Yamamoto KEK, Japan
	The electron positron collider KEKB is operating at KEK. At KEKB, the electron and positron bunches cross at an angle of 11 x 2 mrad. It is called finite angle collision. In this scheme, non-overlapping of the beam bunches at collision point causes beam instability. To cure this problem, the crab cavity was proposed. In the crab cavity, time varying magnetic field is applied to bunches. The field kicks the head and tail of bunches to opposite direction. And the axis of bunches are tilted. We called the motion crab motion. Effective head-on collisions can be realized using the crab motion while retaining the crossing angle. We called that crab crossing. The crab crossing is effective to boost the luminosity. According to the computer simulation, it is expected that the luminosity will be doubled with crab crossing. The history of crab cavity was started about 20 years ago. The crab crossing scheme was proposed by R.B.Palmer for linear colliders in 1988. K.Oide and K.Yokoya showed the scheme for storage rings in 1989. The baseline design of crab cavity was shown by K.Akai et al in 1993 in collaboration with a Cornell university group. In that design, the shape of cavity that was called squashed cell cavity was not axial symmetric. And it has the coaxial coupler and notch filter. R&D of the crab cavity for KEKB was started in 1994. Two crab cavities were finally installed to KEKB in 2006. The first crab crossing was realized on February 20, 2007. KEKB has been operated about one year with crab cavity. Some problems appeared and were overcome.
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