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User name johna
Log entry time 22:49:57 on January 9,2001
Entry number 54169
Followups:
keyword=HRS-left Preshower HV changes.
Made a preliminary adjustment of the PS HV based on cosmics. We were getting
peaks at about 200 channels for ~60 MeV deposited by cosmic rays. We want this
to be closer to 1 channel/MeV, but in order to keep the voltages from getting too low
(and because I only have an approximate delta_gain/delta_voltage), I've aimed for 90 channels. The following are the channel number (according to the espace histograms), the HV location (slot:channel), the old HV settings, and the new HV settings. The changes were made just before run 1128.
PS_num HV_loc HVold HVnew
------------------------------
4 4:00 1130 1013
5 4:01 1255 1139
6 4:02 1195 1078
10 4:03 1175 1080
11 4:04 1200 1136
12 4:05 1175 1054
16 4:06 1190 1078
17 4:07 1280 1152
18 4:08 1100 969
22 4:09 1160 1032
23 4:10 1210 1069
24 4:11 1025 1070
28 5:00 1100 956
29 5:01 1200 1040
30 5:02 1115 1026
34 5:03 1110 1019
35 5:04 1275 1169
36 5:05 1185 1098
40 5:06 1165 1107
41 5:07 1165 1033
42 5:08 1175 1067
46 5:09 1165 1025
47 5:10 1200 1049
48 5:11 1080 945
1 7:00 960 822
2 7:01 1180 1050
3 7:02 1075 957
7 7:03 1150 996
8 7:04 1140 1015
9 7:05 1105 1012
13 7:06 1275 1168
14 7:07 1175 1063
15 7:08 1100 996
19 7:09 1175 1032
20 7:10 1110 973
21 7:11 1210 1077
25 8:00 1160 1055
26 8:01 1180 1059
27 8:02 1145 1017
31 8:03 1180 1080
32 8:04 1180 1078
33 8:05 1095 982
37 8:06 1200 1120
38 8:07 1165 1112
39 8:08 1205 1118
43 8:09 1160 1037
44 8:10 1155 1027
45 8:11 1050 937