Abstract
The performance of a prototype drift chamber operating in a He-based gas mixture as a specific ionisation detector is presented. In spite of the small number of primary ions, Helium performs quite satisfactorily in measuring energy losses for charged particles: with 50GeV/c pions, we have measured in a 90%He–10%iC4H10 mixture a relative energy loss resolution of 3.1% with 75 samples 3cm long, using a modified Truncated Mean technique with 80% accepted fraction.The dependence of the resolution on several parameters such as the operating voltage, the truncation fraction, the number and length of the samples is discussed.
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