Improving the electric field uniformity in large hybrid focal plane detectors

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Abstract

The characteristics of a large volume hybrid counter consisting of an ionization chamber with a multi-element anode are described. Modifications to the cathode structure have been made in order to reduce the edge effects due to non-uniformities in the electric field distribution arising from the increased cathode-anode separation. Typical measurements obtained with this detector are presented and indicate that the values of the ΔE and E resolutions are similar to those for smaller volume counters.

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Research supported by the Division of Nuclear Physics of the U.S. Department of Energy under Contract No. W-7405-eng-26 with Union Carbide Corporation.

∗∗

Oak Ridge Associated Universities Fellow from Vanderbilt University.

Graduate Student from the University of Virginia, Present address: Florida State University, Tallahassee, Florida.

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