Abstract
Abstract A spatial resolution and an incident angle dependence were measured in a cosmic ray test of a simple drift tube with a square cross section of 8×8 cm2. By optimizing the anode diameter (100 μm) and cell size, and by choosing P10 gas (Ar90%+CH410%), the incident angle dependence can be made negligibly small. The spatial resolution is dependent largely upon the threshold level of the discriminator; the best value of 310 μm (rms) was obtained by using a handmade constant fraction timing discriminator.
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