Download - HES HKS meeting
HES HKS meeting15 Nov 2010
T.Gogami
E05-115 experimental setup in JLab Hall C (2009)
Content
• e , e+ rejection in h_tof_pre.f• POSI– Electron rate
• Moller
e , e’ backgroundReject e,e+ in h_tof_pre.f
REAL DATA
h_tof_pre.f
NO CHANGE FOR• OPTICS• K+
File size and analysis time 7Li 52Cr CH2 H2O
File before[MB]
12.0 1.6 9.6 2.6
File after[MB]
9.3 0.7 7.0 1.4
Time before/100000
4:06 5:29 3:16 5:16
Time after/100000
4:41 4:51 2:51 4:49
File size 46% ~ 78 %Time 90%
Number Reconstruction with POSI
~ 4 [MHz] HES single
Theta vs. Phi cutSIMULATION
• HES• EDCTrig• EYQ1i > -4.7 [cm]
Chromium target
• POSI• Electron flag
Electron Rates
Events : 92/(2G)
2.3 ± 0.24 [MHz] at 7.9 [μA]
~ OK
700 – 988 [MeV/c]
1. Electrons which are not on optics.2. Simulation is loose
SIMULATION
Added new leaves ( POSI )
• Electron– Beam Passing through– Ionization– Brems.
• Photon– Compton scattering– Photoelectric effect– Photon conversion
SIMULATION
Cross section of Moller scattering
CALCULATION
Summary and to do• Summary– e , e+ rejection in h_tof_pre.f– POSI
• Electron rate– Moller
• to do– Analysis
• Residual of chambers for each arm.• HES tracking
– Strangeness 2010 in KEK• Preparation
– タイヤ交換
End