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Abstract:
Measured drift velocities using an uniform field drift chamber and multiplication factors obtained with proportional tubes in He-based gas mixtures He+CH4(80/20,70/30) and He+iC4H10 (85/15,80/20,70/30) are reported.The results are good agreement with calculations by Garfield Code. The Saturated drift velocity is Vd≈2.7cm/μs and multiplication factor of M≈104—105 at certain working voltage is manageable in He/CH4(80/20) gas mixture,and it is good candidate of working gas for use of low momentum and high precision measurement in the drift chambers.
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