Characteristics of multiwire proportional counters with delay line readout for minimum ionizing particles
The effects of gas mixture and chamber thickness on the gain and pulse shape of a multiwire proportional counter with delay line readout were studied. The primary concern was with optimizing the position accuracy for high-energy particle physics applications. The best results, both from the point of view of chamber gain and the risetime and uniformity of the delay line pulses were obtained with a 4 mm gap chamber run on a mixture of 30% carbon dioxide and 70% argon. It was found necessary to bias the outer grids negative with respect to ground to prevent electrons in the drift regions from migrating into the multiplication region and spoiling the delay-line pulse shape. (auth)
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-29-000480
- OSTI ID:
- 4422588
- Report Number(s):
- LBL--2064
- Country of Publication:
- United States
- Language:
- English
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