Potential HV change vi_B --> ? towers only
HV used : set vi_B
300K minB events, details of slopes extraction.
PDF for all 12 eta bins.
Left: slopes vs. phi. Black towers with slopes differing by 5%+ from the average
Right: weighted, truncated distribution of slops & fit.
GAIN CHANGE between HV set vi_B -->iv_B
etaBin | set iv_A avrSlope (RMS) | set iv_A avrSlope (RMS) | achieed gainB/gainA | intended gainB/gainA | delta
|
1 | -0.152 (0.010) | -0.152 (0.0089) | 1.000 | 1.00 | 0%
|
---|
2 | -0.146 (0.007) | -0.144 (0.009) | 1.014 | 1.00 | +1.4%
|
---|
3 | -0.144 (0.0084) | -0.143 (0.007) | 1.007 | 1.00 | +0.7%
|
---|
4 | -0.146 (0.0086) | -0.144 (0.0065) | 1.013 | 1.00 | +1.3%
|
---|
5 | -0.146 (0.0079) | -0.141 (0.0073) | 1.035 | 1.081 | -4.6%
|
---|
6 | -0.144 (0.0078) | -0.137 (0.0062) | 1.051 | 1.096 | -4.5%
|
---|
7 | -0.141 (0.0090) | -0.132 (0.0069) | 1.068 | 1.104 | -3.6%
|
---|
8 | -0.139 (0.0078) | -0.134 (0.0056) | 1.037 | 1.049 | -1.2%
|
---|
9 | -0.136 (0.0084) | -0.128 (0.0063) | 1.063 | 1.062 | +0.1%
|
---|
10 | -0.130 (0.0077) | -0.122 (0.0064) | 1.066 | 1.080 | -1.4%
|
---|
11 | -0.123 (0.0059) | -0.118 (0.0057) | 1.042 | 1.046 | -0.4%
|
---|
12 | -0.125 (0.0073) | -0.112 (0.0058) | 1.116 | 1.135 | -1.9%
|
---|
Conclusions
the overal gain change was in the correct direction. We undershoot a bit.
With avaliable accuracy of ~1-2% we can say current gains are at 60GeV maxET for all eta bins except bins 5-7, where we may still have absolute gains too low by ~3%.
there is ~10 individual towers for which it would make sense to change HV (see previous page.)
to improve staistical accuracy of indvidual slopes below ~5% -->3% we need 1M minB events.