Study on high-Luminosity Electron-Positron Colliders

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Collaboration on Electron-Positron Colliders went on between Budker Institute of Nuclear Physics (BINP) and High Energy Accelerator Research Organization (KEK) for three years from JFY1997 to JFY1999. BINP has been working on colliders from the very early days of this type machines and is considering to construct Phai and TauCharm factories for their future projects. KEK has completed the construction of KEKB, an asymmetric-energy B-factory, in 1998. The collaboration between the two major laboratories in the field of electron-positron colliders has been beneficial to both parties.(1) Construction of 900 horizontal steering magnets for KEKB by BINP - KEKB needs high-quality steering magnets and BINP constructed them with a satisfactory quality.(2) Theoretical study on beam-beam interactions and study on round-beam collision at VEPP-2M at BINP - instabilities due to head-tail effect at beam-beam collision, emittance growth due to beam-beam collision, and dependence of the flip-flop effect on the aspect ratio of beams at collision were theoretically studied. Possible experiment of round-beam collisions at VEPP-2M was discussed between KEK and BINP.(3) Theoretical study on fast-ion instability - It was shown theoretically that the fast-ion instability might be suppressed due to tune variation along a bunch train.(4) commissioning of KEKB - BINP researchers participated in KEKB commissioning. KEKB is now supplying beams to physics experiment and its luminosity has surpassed 10ィイD133ィエD1cmィイD3-2(/)sィエD3ィイD1-1ィエD1.