etienver (2003) helium + alcohol mixture high energy crossing electrons (> 4.5 mev)
DESCRIPTION
Etienver (2003) Helium + alcohol mixture High energy crossing electrons (> 4.5 MeV) V. I. Tretyak (2003/2004) Helium + alcohol + argon + water > Feb 2003 Works well for drift time > 60 ns. In both cases: TDCFAST_MIN = 220 drift time cut off at 1750 ns All planes calibrated together. - PowerPoint PPT PresentationTRANSCRIPT
01877283.00873.287
6758748.084.0
t
td
ct
atD
b
A. Etienver (2003)
- Helium + alcohol mixture
- High energy crossing electrons (> 4.5 MeV)
V. I. Tretyak (2003/2004)
- Helium + alcohol + argon + water
- > Feb 2003
- Works well for drift time > 60 ns
43.1 14880
1480220
22060
600
0
Dt
ftDt
ctbDt
ctbDt
aDt
g
In both cases:
TDCFAST_MIN = 220 drift time cut off at 1750 ns
All planes calibrated together
Data selection
Performed calibration on 1 year of data: Jan-Dec 2006 (inclusive): 814 betabeta runs
Track cuts:2 tracksnegative curvatureassociated with scintillator 2 scintillators hitangle from z-axis: min = 40°, max = 140°.cosine θ ≤ -0.5
Energy cuts:minimum energy = 200 keVmaximum energy = 100 GeV
Time of flight cuts:internal tof: < 1%external tof: > 4%
Vertex cuts:dr < 2 cmdz < 4 cm
Other:Geiger hit assoc with track
At low drift times, Gaussian fits bad (give negative medians) use mode
At higher drift times, Gaussian fits are better and lower stats make the mode redundant Use Gaussian
Cut on first plane:
chi2/ndf > 3.5
Cut on second plane:
chi2/ndf > 5
Cut on fourth plane:
chi2/ndf > 3.3
Cut on fifth plane:
chi2/ndf > 2.5Cut on seventh plane:
chi2/ndf > 2.5Cut on eighth plane:
chi2/ndf > 3.8Cut on ninth plane:
chi2/ndf > 2.5
A B C D
Previous
calibration
0.675 0.84 287.1 0.018
1st plane 14.2247 1.22231 9425.43 0.0706499
2nd plane 3.04579 1.04048 1307.28 -0.0495093
4th plane 100.00 1.4856 65370 0.0523942
5th plane 27.4239 1.31039 18181.4 0.081394
7th plane 19.4827 1.26797 12615.4 0.0661054
8th plane 7.81696 1.16184 3993.77 -0.00817665
9th plane 46.8874 1.3867 28149.5 0.0213797
DCx
Axy
B