H. Fenker et al., RESOLUTION MEASUREMENT OF AN INTERPOLATING PAD CHAMBER IN THE 9 GEV C-PI- BEAM AT BNL/, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 346(1-2), 1994, pp. 75-94
Results are presented from the first test of a full size barrel protot
ype Interpolating Pad Chamber for the GEM central tracker in the 9 GeV
/c pi- beam at the Brookhaven AGS. An average resolution of 45 mum has
been achieved using electronics functionally identical to the final G
EM design. Two 50 mRad stereo pad layers combine to give 680 mum resol
ution in the direction along the chamber. A calibration procedure whic
h uses the data to measure the gains and pedestals for each pad has be
en developed and is presented together with resolution results from th
e silicon telescope used to project the tracks into the pad chambers.