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The performance of a scintillating fiber (2mm diameter) position sensitivedetector ($4.8 \times 4.8$ cm$^2$ active area) for the single bremstrahlungluminosity monitor at the VEPP-2M electron-positron collider in Novosibirsk,Russia is described. Custom electronics is triggered by coincident hits in theX and Y planes of 24 fibers each, and reduces 64 PMT signals to a 10 bit (X,Y)address. Hits are accumulated (10 kHz) in memory and display (few Hz) theVEPP-2M collision vertex. Fitting the strongly peaked distribution ( $\sim$ 3-4mm at 1.6m from the collision vertex of VEPP-2M ) to the expected QED angulardistribution yields a background in agreement with an independent determinationof the VEPP-2M luminosity.Comment: LaTeX with REVTeX style and options: multicol,aps. 8 pages,  postscript figures separate from text. Accepted in Review of Scientific  Instruments (~ Aug 1996

Scintillating fiber hodoscope for a bremsstrahlung luminosity monitor at an electron–positron collider