Experience with the Goofie during the TPC commissioning
نویسندگان
چکیده
The ALICE TPC is a detector with a total volume of 88 m filled with a ternary gas mixture of Ne-CO2-N2 [9010-5]. To achieve its position and energy resolution requirements it is necessary to control small fluctuations in the gas composition as well as drift velocity variations [1]. A modified drift velocity monitor known as Goofie is measuring the drift velocity and also the gain. The drift velocity is obtained from the time difference between the drifting electrons produced by two emitting alpha sources, placed at known distances from a pickup detector (Fig.1).
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