Diffusion in Helium-Ethane (Calculated)

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 (transverse):


Sigma (longitudinal) (nearly independent of B):

Page created by Roy Bossingham; send comments to RRBossingham@lbl.gov.
Last modified: May 17, 2000  .