User name bogdanw
Log entry time 20:52:38 on January21,2001
Entry number 55369
keyword=S1/S2 PMT checkoutThe checkout of after pulse probability was made.
The results below indicate that six PMTs have such probability above 5%.
Jack and I replaced three tubes on Left Arm on the
positions S2/1right, S2/2right, and S2/4right.
The initial HVs are installed -2250 V.
It most likely should be reduced later based on ADC results.
the Right Arm
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
#PMT % of after pulse #PMT
S1/1 left 4.0 S1/1 right 3.4
S1/2 1.0 1.1
S1/3 2.8 S1/3 right 1.0
S1/4 0.7 0.9
S1/5 0.6 1.0
S1/6 1.4 S1/6 right 1.1
S2/1 2.9 S2/1 right 7.2
S2/2 1.3 S2/2 right 6.4
S2/3 1.1 0.6
S2/4 1.7 4.8
S2/5 0.9 1.5
S2/6 7.5 1.3
----------------------------------
the Left Arm
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
#PMT % of after pulse #PMT
S1/1 left 1.2 S1/1 right 0.7
S1/2 1.3 1.8
S1/3 0.6 S1/3 right 2.6
S1/4 2.7 2.5
S1/5 1.3 2.5
S1/6 2.2 S1/6 right 2.7
S2/1 4.2 S2/1 right 11.5
S2/2 3.7 S2/2 right 8.6
S2/3 1.9 3.2
S2/4 2.7 7.4
S2/5 2.5 2.3
S2/6 3.2 3.8
-----------------------------------
FIGURE 1
