Use of a Large Gap Spark Chamber in an Intense Beam of Particles

Abstract
An application is considered where a beam of charged particles is passed through a large gap spark chamber. It is shown that the use of helium gas contained in a thin plastic bag in the region of the beam can reduce the efficiency of the spark chamber, in that region, to as little as 10−6 or less. The efficiency for track detection outside this region is maintained at 100% with the use of a gas mixture of 89% neon, 10% helium, and 1% argon.

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