Abstract
We report on a UA1 technical run made with four nitrogen lasers mounted on the UA1 Central Detector during the 1987 proton-antiproton collider run. With only moderate laser power (< 7 μJ/mm 2) and the help of gas seeding (1 ppb of tetra-methyl-phenylene-diamine [TMPD]) straight 2 m calibration tracks can be produced. The unexpected effect of track fading under high luminosity conditions was observed. A model is presented explaining this phenomenon, which is based on the removal of neutral TMPD molecules from the drift volume via positive ion charge exchange.
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