Das verhalten von funkenkammern bei triggerung aus der primärionisation und aus der lawine

Abstract

Zusammenfassung A comparison is given between two different triggering modes of spark chambers filled with argon-acetone with special regard to efficiency and accuracy of track location. In the case when the chamber is triggered with primary ionisation, the mean deviation of the spark from the point where the particle passed the chamber is σ =0.52mm and in the case of avalanche σ =0.30mm. A careful examination of the relationship between the incident angle of the particle and the point of localisation of the spark shows in both cases that the deterioration of σ gets larger with increasing incident angle. When the triggering pulse is delayed up to 1.6μs the value of σ increases in primary ionisation whereas it remains constant in the avalanche. The efficiency “ A ” increases rapidly with increasing amplitude of the high voltage trigger pulse and the plateau reaches an efficiency of 95%. In the case of delayed triggering the value of A decreases more slowly in avalanche than in primary ionisation method.