forward tof prototyping
DESCRIPTION
Forward TOF Prototyping. Ryan Mitchell GlueX Collaboration Meeting November 2005. Purpose of the Forward TOF. Forward TOF. Particle ID: π /K separation up to 1.8 GeV/c. Level-1 Trigger: Fast forward charged track count. Calorimetry: Tag hadronic showers in the forward calorimeter. - PowerPoint PPT PresentationTRANSCRIPT
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Forward TOF Prototyping
Ryan Mitchell
GlueX Collaboration Meeting
November 2005
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Purpose of the Forward TOF
• Particle ID:
– π/K separation up to 1.8 GeV/c.
• Level-1 Trigger:
– Fast forward charged track count.
• Calorimetry:
– Tag hadronic showers in the forward calorimeter.
Forward TOF
Particle ID:
70 ps time resolution
1% momentum and length resolutions
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Current Design(and possible improvements)
(Not to Scale)42 bars
Scintillators: 252 ×6 × 1.25cm Eljen-200 or Bicron
Beam Hole: 12 × 12 cm Hole
Photomultiplier Tubes: XP2020
Electronics: Alberta CFD JLab F1TDC fADC
Would thicker bebetter?
Is this the best we can do for...
timing?fringe field?
Need more experiencewith this (esp. range)...
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Outline of Prototyping I:Finished/Ongoing
1. IHEP Test Beams – 2001 to present
-- < 80ps resolution is achievable with 200 × 6 × 1.25cm bars
-- December 2005 tests will look at 250cm bars
• IU Cosmic Ray Tests – Spring 2004
-- First measurements were made with a 250 × 6 × 1.25cm bar
-- Find 88ps resolution in the center region (2 bars)
• TRIUMF Beam Test – Summer/Fall 2005
-- Low energy π/μ/e beam used on two layers of scintillators
-- Probing time resolution for a variety of dE/dx and all positions
-- Discriminator performances
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Outline of Prototyping II:3 Year Plan
1. IU Cosmic Ray Tests – 2006 to Spring 2007
-- Another round of tests with the IU cosmic ray stand.
-- 88ps is not sufficient; look at bar thickness.
-- Try a variety of phototubes.
-- Use Alberta CFD and commercial CFD and LED.
2. Hall-B Electron/Photon Tests (with LGD) – Fall 2007 Run
-- Take the final design to the Hall-B alcove test
-- Scan 2 walls of 10 bars each (one full length; one half length).
-- Correlate with the LGD and tagger.
3. Magnetic Field Tests (with LGD) – 2008
-- Make sure everything works in the fringe field.
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2004 IU Cosmic Rays Summary
PMT: XP2020TDC: LeCroy 2228A (50ps least count)ADC: LeCroy 2249A and IU fADCCFD: Ortec and University of AlbertaScint: 250 × 6 × 1.25cm
Three movable cosmic ray telescopes in a logical OR.Scintillator is enclosed in a light-tight box (the “coffin”).
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2004 IU Cosmic Rays Summary
Attenuation Length = 160.5 ± 4.2 cm
Velocity = 14.77 ± 0.09 cm/ns
Time Resolution = 88 ps
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2005 TRIUMF Test Beam Summary
First two weeks of June 2005.
120 and 250 MeV/c π/μ/e beams.
Full size and half size scintillators.
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Same electronics as cosmic ray tests:PMT: XP2020TDC: LeCroy 2228A (50ps least count)ADC: LeCroy 2249A and IU fADCCFD: Ortec and University of AlbertaScint: 250 × 6 × 1.25cm
2005 TRIUMF Test Beam Summary
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2005 TRIUMF Test Beam Summary
Sample ADC and TDC from one bar end.
-- 120 MeV/c π/μ/e beam -- 3 Moyal distribution fit to ADC -- 3 Gaussian distribution fit to TDC
e+ e+
μ+μ+
π+π+
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2005 TRIUMF Test Beam Summary
Four scans along a front bar.
Mean ADC from the two bar ends are superimposed.
Attenuation Length = 136.7 ± 3.4 cm
pionmuonelectron
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2005 TRIUMF Test Beam Summary
Anomalies in ADC vs TDC
Good
e+
μ+
π+
Severetime-walkfor electron
e+e+ e+
μ+
μ+ μ+π+
π+ π+
Double-peakelectron
Double-peakmuon
-- Similar behavior for both Alberta and Ortec CFD.-- Needs further analysis.-- Need more tests with different discriminators.
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2005 TRIUMF Test Beam Summary
π/e separation
μ/e separation
π/μ separation
Four scans along a front bar.
TDC differences from the two ends are superimposed.
Very consistent run to run results.
Nonlinearities are likely due toADC vs TDC anomalies.
Very Important. Needs to beinvestigated further.
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Three Outstanding Design Issues
1. The 88ps resolution for the 252 × 6 × 1.25cm bars is not acceptable. Try doubling the bar thickness.
2. Understand the discriminator issues. Try out a few commercial models (CFD and LED).
3. Explore different phototube options. Can we find something better than the XP2020 for timing and performance in a magnetic field?
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Phase I Prototype (2006): Cosmics
PLAN:Use the existing IU cosmic ray test stand to explore: -- bar thickness -- discriminators -- phototubes
BUDGET:Phototubes: 12k (e.g. Hamamatsu R9779, Hamamatsu R2083, Hamamatsu R1828, Electron D744, Photek PMT340)Discriminators: 12k (e.g. Ortec 935, Phillips 7106, 708, 710, 715, 730)
2006 Request = 24k
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Phase II Prototype (2007): Test Beam
PLAN:Test 2 walls of 10 scintillators each (one long horizontal wall and one short vertical wall) in November 2007 along with the LGD. -- use electrons and photons from Hall-B -- scan bars for time and position resolutions. -- correlate the timing with the LGD and the tagger.
BUDGET:Phototubes: 18k (instrument 20 bars with XP2020)Scintillators: 5kHigh Voltage: 25kCables: 5kSupplies: 6k
2007 Request = 59k
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Phase III Prototype (2008): Magnet
PLAN:Test the prototype in the magnet fringe field.
BUDGET:No new money anticiptated.
2006-2008 Request = 83k