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User name yez
Log entry time 18:24:56 on February 15, 2011
Entry number 347058
keyword=HRS: Cerenkov Calibration: Left Arm updated and Right Arm might need to increase HVsI am working on Cerenkov calibration, and used run#1197 to calibrate Left Arm and #1280 to calibrate Right Arm. For the Left arm, the new calibrated values is close to previous values in data base, but for the Right Arm, you can see from the graph, the peaks in between pedestal and signal photon electron is very close, and the gain factors, which align the distance inbetween them to be 200 channels, must be much bigger than what they were. We might need to increase the HVs of Cerenkov: Left: Pedestal values of Gas Cherenkov channels --------------- 400 360 330 310 460 513 480 464 362 381 Amplitude transformation coefficients of Gas Cherenkov channels -- 1.76 0.80 1.27 1.14 1.17 1.67 1.24 2.44 1.58 1.93 Right: Pedestal values of Gas Cherenkov channels ------------- 490 336 308 338 461 577 483 549 312 292 Amplitude transformation coefficients of Gas Cherenkov channels ---------------- 4.2 4.06 3.11 4.78 2.50 3.77 4.40 5.41 2.845 2.34 (Were:1.0 1.0 0.663 0.809 0.581 0.831 0.910 1.147 0.692) 0.607
A copy of this log entry has been emailed to: vasulk@jlab.org,danez@jlab.org,rom@jlab.org,kelleher@jlab.org
L-HRS Cerenkov
R-HRS Cerenkov
