Using Molecular Dissociation to Determine the Absolute Efficiency of a Delay Line Microchannel-plate Detector
B. Gaire, A.M. Sayler, P.Q. Wang, Nora G. Johnson, M. Leonard, E. Parke, K.D. Carnes, I. Ben-Itzhak
James R. Macdonald Laboratory, Department of Physics,
Kansas State University, Manhattan, KS, USA
We present a method to measure the absolute detection efficiency of a delay line microchannel-plate (MCP) detector using the breakup of diatomic molecular ions. This method gives the absolute detection efficiency for each of the five signals of the detector. The method is based on the fact that molecular breakup always yields two hits on the detector, but due to finite detection efficiency some of these events are recorded as single particles while others are detected in coincidence. In order to demonstrate the method, we have evaluated the detection efficiency for both timing and position signals of the delay line detector for the laser induced dissociation of homonuclear and heteronuclear molecular ions (e.g. H2+, O2+, HD+). In addition, the detection efficiency as a function of position has been determined by dividing the detector into sectors.
This work was supported by the
Chemical Sciences, Geosciences and Biosciences Division,
Office of Basic Energy Sciences,
Office of Science, U.S. Department of Energy.
Submitted to CAARI, August 2006 in Fort Worth, TX.
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