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In KEKB, synchrotron radiation interferometers (SRMs) are used for measuringthe transverse beam sizes. There is also a tool for enlarging the vertical beamsize intentionally by making an asymmetric bump, called an ``iSize'' bump, atone of the strongest non-interleaved sextupole magnets in each KEKB ring. Thecalibrations of the SRMs were checked by comparing the measured vertical beamsizes with those calculated using the computer code ``SAD''. The obtainedcorrection factors are 1.000$\pm$0.045 for HER and 0.971$\pm$0.060 for LER,which are consistent with the calibration factors of SRMs\cite{SRMcalib} withinerrors. Using the obtained calibration factor, x-y coupling of each ring wascalculated .

Synchrotron Radiation Interferometer Calibration Check by Use of A Size Control Bump in KEKB