In the future, the STAR TPC may use He-ethane 50-50 near ambient pressure and temperature, at higher E fields than used now with P10. The following diffusion values were quoted by Howard Wieman from Blair Stringfellow [apparently calculated using Magboltz 1 (Biagi, 1995).] The assumed temperature and pressure were similar, if not identical, to the STAR operating conditions.
Sigma (longitudinal) (nearly independent of B):
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Last modified: May 17, 2000 .