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beam size measurement by $e^\pm$ pairs

The scattering angles of the pairs can be measured by two sets of double discs of pixel device at $\pm$1 m from IP. The beam aspect ratio can be obtained from the measurement of the azimuthal angles. At SLAC, there is a doubt for this possibility because of the huge background of synchrotron radiations etc. .



Toshiaki Tauchi
12/20/1999