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Lingyan Zhu University of Illinois at Urbana-Champaign for Transversity Collaboration Meeting May 4th, 2007. HRS Aerogel Detectors. HRS PID Detectors. Kinematics: P=2.4 GeV Singles Rates: pi- 1.01k; K- 0.05k; e- 0.17k; pi+ 1.69k; K+ 0.34k; p 0.96k - PowerPoint PPT Presentation
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05/04/2007 Transversity Collaboration Meeting 1
HRS Aerogel Detectors
Lingyan ZhuUniversity of Illinois at Urbana-Champaign
forTransversity Collaboration Meeting
May 4th, 2007
05/04/2007 Transversity Collaboration Meeting 2
HRS PID Detectors
Kinematics: P=2.4 GeV
Singles Rates:
pi- 1.01k; K- 0.05k; e- 0.17k; pi+ 1.69k; K+ 0.34k; p 0.96k
Scintillators: some pi/K/p separation with TOF (pi/K--1.6ns; K/p--4.4ns;FWHM with S2M can be 0.66 ns. )
Pion Rejector & Gas Cherenkov: pi(K)/e separation
RICH *1.3: better than 1:1000 pi/K rejection on 80% of the momentum acceptane; lower 15% with ~1:100 rejection.
Aerogel Detectors A1(n=1.015) and A2(n=1.055): additional pi/K/p separation especially at the low momentum.
05/04/2007 Transversity Collaboration Meeting 3
Upgraded RICH Performance
Evaristo Cisbani, Readiness Review
05/04/2007 Transversity Collaboration Meeting 4
The Historical A1/A2 performance
Stefeno Marrone et al, draft paper on A1/A2
2000 original
2005 restored
2004 degraded
P=2 GeV
05/04/2007 Transversity Collaboration Meeting 5
Current Status of A1/A2 (Jan 2007)
Pete Markowitz: http://www.jlab.org/~markowit/Aerogel.html
A1 A2
yellowsurface
falling paper
05/04/2007 Transversity Collaboration Meeting 6
Near Plan of FIU/JLab
Pete Markowitz, Bogdan Wojtsekhowski
Refurnishing of the PMT box of A2 is under way.
To start cosmic test on A2 in about a month and then decide whether to refurnish its aerogel box.
The plan for A1 will depend on result with A2.
May lower the index of A2 from 1.055 to 1.030.
Manpower needed: ~2 man-month per counter.
05/04/2007 Transversity Collaboration Meeting 7
pi/K Identification at Different Index
P=2.4GeV
pi
K
p