TPC Space Charge And Grid Leak Calibration : 2019_AuAu_19p6GeV
Space Charge and Grid Leak Calibration: Au+Au 19.6 GeV
--All daq files from /star/subsys/tpc/SCGL/DAQ_PROMPT/ are used.
--Working directory: /star/u/pokhrel/TPC_Cal/Run19/AfterAlignFixed/19p6/
First Pass
1-Scaler Fit:
USING STDDEV sc => 0.000320 :: gapf => 0.006102
SpaceCharge & GridLeak fit results {scaler: vpdw}:
g2 : 0.380184 +6.98045/-8.19404 or +/- 0.851534
g2 : 0.380184 +/- 7.58725
log(g5) : 3.13352 +0/-2.12472 or +/- 0.442415
log(g5) : 3.13352 +/- 0.442415
log(SC) : -16.2557 +0.167452/-0.203351 or +/- 0.183583
log(SC) : -16.2557 +/- 0.185402
SO : 6828.03 +5139.9/-5150.49 or +/- 5170.76
SO : 6828.03 +/- 5145.2
log(GL) : -4.09631 +0/0 or +/- 126.668
log(GL) : -4.09631 +/- 5.72486
*** FINAL CALIBRATION VALUES: ***
sc = (8.715e-08 +/- 1.616e-08) * ((vpdw) - ( 6828 +/- 5145))
with GL = 0.02 +/- 0.10
Figure 1: 1-parameter SC fit Figure 2: 1-parameter GL fit
Figure 1 (a): 1-scaler SC fit (GL000 Set
2-Scalers Fit result:
USING STDDEV sc => 0.000243 :: gapf => 0.006088
SpaceCharge & GridLeak fit results {scaler: (-8.47523e-10*(bbcw+615760))+(1.07441e-07*(vpdw))}:
g2 : 0.469162 +7.01836/-8.47472 or +/- 8.97844
g2 : 0.469162 +/- 7.74654
log(g5) : 3.1597 +0/-2.04544 or +/- 0.386787
log(g5) : 3.1597 +/- 0.386787
log(SC) : -0.0115613 +0.128705/-0.149412 or +/- 0.139925
log(SC) : -0.0115613 +/- 0.139059
SO : -7.25305e-06 +0.000343808/-0.000344283 or +/- 0.000346541
SO : -7.25305e-06 +/- 0.000344045
log(GL) : -2.09888 +0/0 or +/- 23.8043
log(GL) : -2.09888 +/- 4.2062
*** FINAL CALIBRATION VALUES: ***
sc = (1.0 +/- 0.1391)*(-8.378e-10*(bbcw-(-6.072e+05 +/- -4.059e+05))+(1.062e-07*(vpdw)))
with GL = 0.12 +/- 0.52
WARNING! Symptoms of non-linearity in chosen luminosity scaler!
Figure 3: 2-parameter SC fit Figure 4: 2-parameter GL fit
Figure 3 (a): 2-parameter SC fit (GL000 Set)
3-Scalers Fit Result:
USING STDDEV sc => 0.000205 :: gapf => 0.006082
SpaceCharge & GridLeak fit results {scaler: (-5.79483e-10*(bbcw+1.14241e+06))+(-7.07295e-07*(zdcxnk))+(3.91873e-07*(zdcwnk))}:
g2 : 0.408632 +6.85634/-8.18607 or +/- 8.89254
g2 : 0.408632 +/- 7.5212
log(g5) : 3.09127 +0/-1.87519 or +/- 5.72868
log(g5) : 3.09127 +/- 5.72868
log(SC) : 0.0187372 +0.107566/-0.126945 or +/- 0.119088
log(SC) : 0.0187372 +/- 0.117255
SO : -1.03583e-05 +0.000284863/-0.000282103 or +/- 0.000287279
SO : -1.03583e-05 +/- 0.000283483
log(GL) : -1.42519 +0/0 or +/- 10.4947
log(GL) : -1.42519 +/- 4.20614
*** FINAL CALIBRATION VALUES: ***
sc = (1.0 +/- 0.1173)*(-5.904e-10*(bbcw-(-1.125e+06 +/- -4.892e+05))+(-7.207e-07*(zdcxnk))+(3.993e-07*(zdcwnk)))
with GL = 0.24 +/- 1.01
WARNING! Symptoms of non-linearity in chosen luminosity scaler!
Figure 5: 3-parameter SC fit Figure 6: 3-parameter GL fit
Second Pass
-
1-scaler fit result was propagated from the first pass.
(sc = (8.715e-08 +/- 1.616e-08) * ((vpdw) - ( 6828 +/- 5145)) with GL = 0.02 +/- 0.10)
1-scaler fit result:
- sc+gl fit failed.
-
Forcing scaler to "vpdw", converged the fit.
"vpdw" scaler fit result:
USING STDDEV sc => 0.000346 :: gapf => 0.006573
SpaceCharge & GridLeak fit results {scaler: vpdw}:
g2 : 1.67579 +0/0 or +/- 0.141863
g2 : 1.67579 +/- 0.163622
log(g5) : 3.33081 +0/0 or +/- 0.0260823
log(g5) : 3.33081 +/- 0.421071
log(SC) : -16.2604 +0.191378/-0.235991 or +/- 0.0265703
log(SC) : -16.2604 +/- 0.213685
SO : 9639.1 +5577.47/-5561.23 or +/- 757.611
SO : 9639.1 +/- 5569.35
log(GL) : -1.68694 +0/0 or +/- 11.7672
log(GL) : -1.68694 +/- 5.97728
*** FINAL CALIBRATION VALUES: ***
sc = (8.674e-08 +/- 1.854e-08) * ((vpdw) - ( 9639 +/- 5569))
with GL = 0.19 +/- 1.11
WARNING! Symptoms of non-linearity in chosen luminosity scaler!
Suggestion: use PCA method
Fig: SC vs "vpdw" (GL000 dataset)
2-scaler fit result:
USING STDDEV sc => 0.000249 :: gapf => 0.006448
SpaceCharge & GridLeak fit results {scaler: (2.45627e-06*(vpdx-301.91))+(-1.083e-05*(zdcxnk))}:
g2 : 1.69387 +4.41671/-3.50892 or +/- 5.48126
g2 : 1.69387 +/- 3.96282
log(g5) : 3.38368 +0/0 or +/- 0.133465
log(g5) : 3.38368 +/- 0.225435
log(SC) : -0.00744595 +0.140806/-0.162654 or +/- 0.150452
log(SC) : -0.00744595 +/- 0.15173
SO : 1.43862e-06 +0.000349135/-0.000350516 or +/- 0.000352795
SO : 1.43862e-06 +/- 0.000349826
log(GL) : -1.40764 +2.21962/0 or +/- 8.47862
log(GL) : -1.40764 +/- 8.47862
*** FINAL CALIBRATION VALUES: ***
sc = (1.0 +/- 0.1517)*(2.438e-06*(vpdx-( 302.5 +/- 142.4))+(-1.075e-05*(zdcxnk)))
with GL = 0.24 +/- 2.07
-- Different scalers combination than the first pass.
--Choosing scalers "bbcw" and "vpdw"(same scalers combination from the first pass) :
USING STDDEV sc => 0.000249 :: gapf => 0.006461
SpaceCharge & GridLeak fit results {scaler: (-9.67803e-10*(bbcw+768119))+(1.09499e-07*(vpdw))}:
g2 : 1.67581 +4.46738/-3.50667 or +/- 0.463637
g2 : 1.67581 +/- 3.98703
log(g5) : 3.41148 +0/-2.36168 or +/- 5.15372
log(g5) : 3.41148 +/- 5.15372
log(SC) : -0.0070714 +0.140258/-0.16387 or +/- 0.150541
log(SC) : -0.0070714 +/- 0.152064
SO : 1.13e-06 +0.000350936/-0.000351278 or +/- 0.00035312
SO : 1.13e-06 +/- 0.000351107
log(GL) : -1.46855 +2.2873/0 or +/- 9.00513
log(GL) : -1.46855 +/- 9.00513
*** FINAL CALIBRATION VALUES: ***
sc = (1.0 +/- 0.1521)*(-9.61e-10*(bbcw-(-7.693e+05 +/- -3.628e+05))+(1.087e-07*(vpdw)))
with GL = 0.23 +/- 2.07
WARNING! Symptoms of non-linearity in chosen luminosity scaler!
Suggestion: use more PCA variables
Fig: 2-scalers fit (GL000 datasets)
Observations:
-- Second pass results are poorer than the first pass results.
-- 2-scalers fit result from the first pass would provide the best calibration parameters.
sc = (1.0 +/- 0.1391)*(-8.378e-10*(bbcw-(-6.072e+05 +/- -4.059e+05))+(1.062e-07*(vpdw)))
with GL = 0.12 +/- 0.52
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