1. Current status
Minjung Kim

2. In spin pwg meeting, SMD gain problem
->Sasha suggests to run macro with all SMD gain==1.0, then how things will changed
South y
South x
North y
North x
0.873
1.054
0.994
1.037
1.124
1.069
1.072
1.014
1.197
0.903
0.96
0.939
1.006
1.068
1.074
1.099
1.221
1.034 1
1.096
0.859
1.204
1.061
1.217
1.065
1.132
1.235
<-current gain parameters (DB)
Order in strips
X: left to rignt
Y: bottom to top
(among 32 channels, 2 channels are sum channel. I don’t use those channels)

3. Left: old gains Right: all gains==1.0

4. Left: old gains Right: all gains==1.0

5. Left: old gains Right: all gains==1.0

6. Left: old gains Right: all gains==1.0

7. Left: old gains Right: all gains==1.0

8. Left: old gains Right: all gains==1.0

9. SMD normalized gain South y South x North y North x Norm South y
Norm South x
Norm North y
Norm North x
0.873
1.069
1.068
0.859
1.054
1.197
1.074
1.204
0.994
0.903
1.099
1.061
1.037
0.96
1.221
1.217
1.124
0.939
1.034
1.065 1
1.132
1.072
1.006
1.235
1.014
1.096
Norm gain : divided gains with average of each column
Their normalized gain is already almost 1, so set all gain==1 might not show distribution’s gain dependency.
-> need to run macro again with more vary gains

10. Plan
Present results of transverse component analysis with current gain&pedestal parameters, and beam position scan results for systematic errors
Calculate analyzing power & transverse component with various gains -> if it varies a lot, then precise SMD gain calibration is needed.
ZDC calibration

11. backup

12. SMD gain
Seems have been used same gain parameters for several years (from run8?, run9?)
With new pedestal & DB gain, x, y distributions are
With those distribution, it seems we need correct gain parameters.
Maybe gain can contribute error in analyzing power (how much?), but how much for transverse component?

13. Attempt to get SMD gain Cosmic/pedestal run
-> try to calibrate gain relatively by SMD pedestal & MIP peak
Problem: too low energy distributed in ZDC, so mostly in wrong ADC peak, there are only few counts (0~2) in the other ADC channels (total events were ~100000)