1. Yuxi Pan University of California, Los Angeles
FMS Data from Run11
Yuxi Pan
University of California, Los Angeles
FMS Data from Run11

2. Outline Data QA a. trigger performance, estimate luminosity
b. polarization monitoring
c. data quality
Calibration precedure
FMS Data from Run11

3. Trigger performance Number of triggers for each type
FMS Data from Run11

4. Trigger performance
Trigger rate v.s. time
FMS Data from Run11

5. HT, cluster, jet patch,LED
Typical events
HT, cluster, jet patch,LED
FMS Data from Run11

6. Polarization monitoring
All data comes
from these 20
fills -->
analyze fill
15244
FMS Data from Run11

7. Polarization vs time, Fill15244
averaged polarization during data taking
~40%
FMS Data from Run11

8. Data quality Selection: require FMS HT/Bsum/JP trigger set
energy of either side of small detectors>20GeV
or large detector > 12GeV
3.3M FMS triggers selected
Find photon clusters with cone size 0.07 rad
Choose 2-photon clusters in searching for pion/eta candidates
FMS Data from Run11

9. Data quality: cluster energy
FMS Data from Run11

10. Data quality: mass spectra
Pseudorapidity
~(3.5,4.0)
cluster energy
~(30GeV,60GeV)
Estimate sig/bkg
Pion /12000
Eta 3000/15000
Xf~ 0.18
FMS Data from Run11

11. Data quality: mass spectra
Pseudorapidity
~(3.5,4.0)
cluster energy
~(60GeV,90GeV)
Estimate sig/bkg
Pion 500/1500
Eta /3000
Xf~ 0.3
FMS Data from Run11

12. Data quality: mass spectra
Pseudorapidity
~(3.5,4.0)
cluster energy
(90GeV,120GeV)
Estimate sig/bkg
Eta ~ 500/400
Xf~ 0.42
FMS Data from Run11

13. Data quality: mass spectra
Pseudorapidity
~(3.0,3.5)
cluster energy
~(60GeV,90GeV)
Estimate sig/bkg
Pion 2500/1200
Eta 600/1800
FMS Data from Run11

14. Data quality: mass spectra
Pseudorapidity
~(3.0,3.5)
cluster energy
~(90GeV,120GeV)
pion mass shifted
FMS Data from Run11

15. Data quality: Xf of pion & eta
FMS Data from Run11

16. Data quality: detector occupancy
Projected momentum vector on detector plane. pion candidates (2-photon clusters,
abs(M )<0.02,pair event
FMS Data from Run11

17. Data quality: detector occupancy
Pt vs pseudoradipity and Phi
FMS Data from Run11

18. Data quality: spin sorted statistics
pion yield as function of bunchid7bit
yields from different
spin states:
b-up y-up:
b-up y-down: 2751
b-down y-up: 2900
b-down y-down:2628
@abort gap:
Yellow abort gap: 2
Blue abort gap:0
abs(M )<0.02&&N12==2&&Z<0.7<abs(E12-60)<20
FMS Data from Run11

19. Data quality: spin sorted statistics
Determine bXing offset from FMS event rates
20k events ,fill15244
measured fill pattern imported
from cdev (wcm-datafill.dat)
missing bunches of yellow/blue
beam and abort gaps match fms
rate if yellow bunchid7bit is
shifted by 40, blue shift = 0
1st bunch of blue beam is colliding
with 81st bunch of yellow beam at
STAR
FMS Data from Run11

20. Data quality: spin sorted statistics
Determine bXing offset from FMS event rates
missing bunches in blue beam
account for the rest of the zero
rates
Eventually will move to offline
spinDB to get corrected bXing id
and spin bits
FMS Data from Run11

21. Calibration Target constant Et gains:
Gain correction factors calculated by pion mass iteration
-->input to HV curves to get updated HV setting (see Thomas’ talk)
FMS Data from Run11

22. Calibration Measure HV curve for each cell by LED events relative gain
= exp (a0+a1*HV+a2*HV^2)
LED events can also be used
in monitoring gain variations,
tube instability and actual gain
corrections applied during
calibration
FMS Data from Run11

23. Calibration: LED events
tube instability
leads to poor HV
curves and gain
variations
apply averaged
HV curves
FMS Data from Run11

24. Calibration: HV curves
relative gain = exp (a0+a1*HV+a2*HV^2)
Identify 3 types of bases: large cell/small cell PSU /small cell Yale bases
Find average curve parameters for each of these 3 types
FMS Data from Run11

25. Calibration: HV curves
small cell curve parameters : a2
PSU
bases a1
Yale
FMS Data from Run11

26. Calibration: hit occupancy
After applying new HV, we check the hit occupancy of each channel, and manually suppress hot cells
FMS Data from Run11

27. Summary
FMS Data from Run11