A two-bunch beam position monitor

A new beam position monitor digitizer module has been designed, tested and tuned at SLAC. This module, the electron-positron beam position monitor (epBPM), measures position of single electron and positron bunches for the SLC, linac, PEP II injection lines and final focus. The epBPM has been designed to improve resolution of beam position measurements with respect to existing module and to speed feedback correction. The required dynamic range is from 5/spl times/10/sup 8/ to 10/sup 11/ particles per bunch (46 dB). The epBPM input signal range is from /spl plusmn/2.5 mV to /spl plusmn/500 mV. The pulse-to-pulse resolution is less than 2 /spl mu/m for 5/spl times/10/sup 10/ particles per bunch for the 12 cm long striplines, covering 30/spl deg/ at 9 mm radius. The epBPM module has been made in CAMAC standard, single width slot, with SLAC type timing connector. 45 modules have been fabricated.