User name V. Sulkosky
Log entry time 22:51:35 on October18,2007
Entry number 209154
Followups:
keyword=HV adjustment for S1 (RHRS)The HV for the right HRS S1 scintillator were adjusted to align the
ADC spectra. Figure 1 shows the spectra before the HV adjustment for
run # 20037. Figure 2 shows the spectra after HV adjustment for run
# 20045. The old values were determined by looking at the signal
from each PMT on an oscilloscope.
In the process of adjusting the S1 HV's, I discovered that the
S1-L/S1-R HV or signal channels appear to be swapped from what I
expect. The S1-1L HV cable is plugged into card #2 (HV crate #3)
channel #0, and S1-6L is plugged into channel #5, etc. Then S1-1R is
plugged into channel #6, and S1-6R into channel #11, etc. However,
when I change the HV on channel #0, the S1-1R amplitude changes and when I change the HV on channel #6, the S1-1L amplitude changes. I
checked the cables on the detector and the labeling appears to be
fine. Tomorrow, I will check the signal cables to make sure they
didn't get swapped in the electronics rack for S1.
Channel Old S1 HV (V) New S1 HV (V) S1 PMT
--------------------------------------------------------
2.0 -1720 -1720 S1-1R
2.1 -1841 -1900 S1-2R
2.2 -1790 -1750 S1-3R
2.3 -1686 -1746 S1-4R
2.4 -1900 -1695 S1-5R
2.5 -1900 -2050 S1-6R
2.6 -2000 -1810 S1-1L
2.7 -2000 -1975 S1-2L
2.8 -2100 -1825 S1-3L
2.9 -1940 -1865 S1-4L
2.10 -1902 -1875 S1-5L
2.11 -2000 -1945 S1-6L
FIGURE 1
FIGURE 2
