Abstract
A prototype parallel-plate electromagnetic calorimeter, using high pressure gas as active medium, has been tested in an electron beam at Fermilab. Data were taken in the pressure range of 20 to 100 atm, and with incident beam energies ranging from 16 to 125 GeV. Results on the calorimeter response as a function of electric field, gas pressure, and beam energy are presented for pure argon gas and for several argon-methane mixtures. The calorimeter proved easy to operate, and fast signals were obtained with the argon-methane gas.
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