Abstract
Abstract Resolution limits of large d E /d x sampling detectors were studied systematically for pressures up to 5.5 atm in a variety of argon mixtures. The measurements were performed in a detector consisting of 64 pairs of 2 × 2 cm 2 proportional counters and a 50 cm drift space. Resolving power and linearity of response were measured for several quasi-simultaneous particles at higher pressures, extending the total detector depth to 41 m of NTP equivalent. The results show that resolution is consistently reduced with respect to predictions based on atmospheric pressure measurements for depths up to 7.7 m without drift (EPI detector). Influence of second-order effects and critical parameters affecting the resolution are analyzed with emphasis on compact detector design and relativistic rise region.
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More From: Nuclear Instruments and Methods in Physics Research
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