M.R. Maier

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The authors report on the construction and the performance of a sixteen-channel constant fraction discriminator (CFD) for the Atlas Positron Experiment (APEX). An integrated circuit which contains all the electronic building blocks needed to construct a CFD has been used. Sixteen channels of CFD have been placed into a CAMAC module. An important feature is(More)
Using a double GEM we were not able to operate with gas gains as high as 1000 in gas mixtures employing CO/sub 2/, ethane, and propane quenchers at pressures above 2.0 bar in xenon and 3.0 bar in krypton. However, a trinary mixture of Ar/ethane/DME 78.5/20/1.5 allowed stable performance at 8.0 bar (absolute). Exchanging our double GEM for a quadruple GEM(More)
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