User name Lingyan
Log entry time 20:33:04 on February15,2001
Entry number 56257
keyword=PMT and HV change to l-arm gas#7,#9 and s1#1r, r-arm S1#3lBogdan replaced two PMTs of l-arm gas cherenkov and adjusted the HV according to the single photo electron peak.
HV for #7: -2900 (2.7)
HV for #9: +2300 (15.8) (the different sign comes from different base)
Hakob replaced the PMT of S1 #1r that used to be noisy.
I adjusted the HV to be 2200. The scaler rate is a little more than 100Hz.
By the way, the the HV of r-arm S1#3l has been decreased to 2200 from 2300.
The attached plot comes from run 1921, after the above changes.
The second plot does not show the pulser and has poor statistics because of loose position cut. These plots has been included into the online detetector kumac files by Hong and me.
FIGURE 1
FIGURE 2
