BEAM INSTRUMENTATION FOR THE SUPERKEKB RINGS

The electron-positron collider KEKB B-factory is currently being upgraded to SuperKEKB. The design luminosity of 8 x 1035 /cm2/s will be achieved using beams with low emittance, of several nm and doubling beam currents to 2.6 A in the electron ring (HER) and 3.6 A in the positron ring (LER). A beam position monitor (BPM) system for the HER and LER will be equipped with super-heterodyne detectors, turn-by-turn log-ratio detectors with a fast gate to measure optics parameters during collision operation and detectors of BPMs near the collision point (IP) for orbit feedback to maintain stable collision. New X-ray beam profile monitors based on the coded aperture imaging method will be installed aiming at bunch by bunch measurement of the beam profile. A large angle beamstrahlung monitor detecting polarization of the synchrotron radiation generated by beam-beam interaction will be installed near IP to obtain information about the beam-beam geometry. The bunch-by-bunch feedback system will be upgraded using low noise front-end electronics and new 12-bit iGp digital filters. An overview of beam instrumentation for the SuperKEKB rings will be given in this paper