Study of Helium: Argon: Ethane Gas Mixtures Used in Drift Chambers for Large Acceptance Spectrometers in High Magnetic Fields.

摘要

For today's large acceptance spectrometers, precise knowledge of electrons in gases and magnetic fields is required for particle track reconstruction. Measurements under a variety of conditions must be performed in order to accurately model these processes with software simulations such as GARFIELD. At Brookhaven National Laboratory, a prototype drift chamber, constructed at the Continuous Electron Beam Accelerator Facility (CEBAF), incorporating a hex-cell wire pattern, was filled with helium:argon:ethane and tested in a high magnetic field and without the magnetic field. The results of these tests are compared and indicate little change in the drift velocity of this gas mixture in and out of a high magnetic field.