Abstract
For the KEK B-factory, an electron-positron collider which consists of two storage rings intersecting at the collision point has been running in operation since December 1998. The ring has a circumference of 3016 m, and its vacumm chambers are mainly made of copper. Untill July 2001, a fill with the initial current of 940 mA positron and 730 mA electron was established and the world record luminosity was achieved. Before the goal currents of 2.6 A positron and 1.1 A electron are achieved, the effect of high beam current has been emerging. The effect of electron cloud became evident especially in the LER. Some bellows were found to be warmed by the TE mode of beam induced fields. Direct damage by beam is seen at the surface of the movable mask. An indirect effect of the high beam current passing close to a vacuum seal is also observed.
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