Abstract
Breakdowns were optically and electronically observed in drift tubes and drift chambers. They occur at a critical gain for given intensity in a gas mixture when ultraviolet photons are not completely quenched. It was observed that the breakdowns depended critically on average current for a given gas mixture independent of the size of the drift tubes used. Using 4.6% ethyl alcohol vapor mixed into 50/50 argon ethane gas, breakdowns are eliminated up to 7 ?A average current drawn by pulses on a 1 cm section of an anode wire under an intense source. Pulses with an avalanche size of 106 electrons, rates above 106 pulses per centimeter per wire may be obtained with the elimination of breakdowns.
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