3He(e,e'd) Beam charge Asymmetry and Live-Time asymmetry:
NormAna class:
I spent quite some trying to understand and make work NormAna class.
Here are the results that I got with this class. Later I decided to
write my own code (on the level of the root files). I realized that
this would be faster than modifying it to my needs (exporting data
to root files, not just printing them to a console or log file; using
evscaler instead of scalers etc. ) In addition, with my code I can be
sure that it does exactly what I want and can be easily checked
and corrected (once I have root files, things work much faster.)
charge = (BCMcout - offset*time)/calibration
current = (BCMrate - offset)/calibration
Time is determined from 1024Hz clock. I took Yawei's calibration constants.
Results for #2300:
------------ NormAna Scaler Summary ----------------
Time of run 0.99 min
Triggers: 1 = 18782799 2 = 15945269 3 = 510199 4 = 11372 5 = 56871
Accepted triggers: 185982
Accepted triggers by target and helicity state:
(++) = 0 (+-) = 0 (-+) = 91472 (--) = 91764
Charge Monitors (Micro Coulombs)
Upstream BCM gain x1 691.52 x3 690.00 x10 691.00
Downstream BCM gain x1 671.88 x3 673.34 x10 677.88
Target + Beam +
Upstream BCM gain x1 0.00 x3 0.00 x10 0.00
Downstream BCM gain x1 0.00 x3 0.00 x10 0.00
Target - Beam +
Upstream BCM gain x1 340.73 x3 335.41 x10 328.91
Downstream BCM gain x1 331.04 x3 329.84 x10 327.34
Target + Beam -
Upstream BCM gain x1 0.00 x3 0.00 x10 0.00
Downstream BCM gain x1 0.00 x3 0.00 x10 0.00
Target - Beam -
Upstream BCM gain x1 340.59 x3 335.19 x10 328.69
Downstream BCM gain x1 330.86 x3 330.09 x10 327.13
------------ NormAna Trigger Summary ----------------
#Trigger Prescale Num evt Num in Livetime
#--- Factor CODA file Scalers
1 16777215 1 18782799 0.831
2 16777215 1 15945269 0.978
3 3 165239 510199 0.904
4 4 2102 11372 0.688
5 1 29036 56871 0.475
6 1 12957 27144 0.444
7 65535 0 0 0.000
8 100 519 60873 0.793
#Warning: T3 livetime is significantly different than the average.
#Warning: T5 livetime is significantly different than the average.
#Warning: T6 livetime is significantly different than the average.
#Warning: T8 livetime is significantly different than the average.
Weighted averaged livetime = 0.723 +- 0.208
Number of events = 200000
#Correction for non-sync of scalers = 1.075
Beam Charge analysis:
My code to calculate BCA: BeamChargeAsymmetry.C Please check for errors!
Ay Run #1339:
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ee'd run #2300 (prod.)
When inspecting only a part of a run, my analysis is more accurate,
since I am using evscalers instead of ordinary scalers (ev. 140)
######################################################################
RunNumber: 2300
NumberOfEvents: 200000
Calibration Constants: calib_u3 = 6370.86, off_u3 = 490.003
Time of run: 63.874 sec.
Charge (ungated BCM) = 742.020000 uAs
Calculated Charge Sum (+/-) = 741.912479 uAs
Collected (h+) Charge = 370.344182 uAs
Collected (h-) Charge = 371.568297 uAs
Helicity Asymmetry = 0.001046 +/- 0.002254
Final Charge Asymmetry = -0.001650 +/- ???
------------------------------------------------
Charge Sum (Gated Scalers) = 726.065252 uAs
Gated scalers (h+) Charge = 362.861456 uAs
Gated scalers (h-) Charge = 363.203796 uAs
Final Charge Asymmetry (Gated Scalers) = -0.000472 +/- ???
######################################################################
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Beam Charge Calibration #2268 (Work in progress):
Due to the problem with BCM problem during ee'd experiment I can not
use Ay calibration constants, but need to determine my own calibration
constants.
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Live-Time calculation:
LT = (TriggerCount_Coda * PSfac)/(TriggerCount_scaler)/unsync
unsync represents the factor which corrects the unsync of scalers and
collected triggers (unsync = bbretime_CODA/bbretime_Scalers)
In my analysis I considered BB scalers. Unfortunately we have only one good
pair of gated scalers for BB, due to the problems with the scaler module
addresses.
My code to calculate Live time Asymmetry: LiveTimeCalculation.C Please check for errors!
ee'd run #2300 (prod.)
######################################################################
RunNumber: 2300
NumberOfEvents: 200000
PS1: 1.67772e+07, PS2: 1.67772e+07, PS3: 3, PS5: 1, PS6: 1, PS8: 100
Correction Factor: 0.99985
T3 Livetime is: 0.852821
T5 Livetime is: 0.73346
T3 Gated(+/-) Livetime Ratio: 0.996974
T5 Gated(+/-) Livetime Ratio: 0.998249
######################################################################
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Quick Helicity Asymmetry for Empty-cell run #3154
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Last modified: 10/26/11
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