A xenon filled multiwire proportional chamber was used to detect synchrotron radiation from high energy electrons traversing the field of a standard spectrometer magnet. Signals from the chamber were used to achieve an electron trigger with a pion rejection of ∼ 17 and an average electron detection efficiency of 81%. Off-line analysis of the chamber signals increased the pion rejection to 59 with an electron efficiency of 77%.
Bibliographical noteFunding Information:
This work was supported by the U.S. Department of Energy and the National Science Foundation . One of us (K .H .) would like to thank the University of Utah where some of this paper was written.