Test results and status on T0
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Test results and status on T0T0: start counter for pp collisions
ShinIchi EsumiInst. of Physics, Univ. of Tsukuba
test experiment at KEK-PSanalysis results and simulationsphoton conversion rejectionSummary, open questions and plan
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ProposedT0 in
PHENIX
TOF
T0
Hiroshi Tsuruoka, Masaya Ono
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Test experiment at KEK-PS
2GeV/c pi- beam
start1start2veto
define1
define2
conv. rej.
T0B-fieldFine mesh PMT: Hamamatsu 2inch R5924
• time resolution
• position dep.
• thickness dep.
• width dep.
• light guide
• B-field dep.
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Time resolution
TDC
ADC
Slewing correction ST1-ST2
ST1-T0 ST2-T0
T0: 59ps
ST1: 39ps
ST2: 31ps
(T0R-T0L)/2
beam width (def. size) : 1[cm]/15[cm/ns]/sqrt(12) ~ 20ps
(T0) ~ 59psYoshiaki Kuroki, Masaya Ono
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HV/position dependence
Masaya Ono, Hiroshi Tsuruoka
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Thickness/width/light guide dependence
Masaya Ono, Hiroshi Tsuruoka
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B-field dependence
Masaya Ono, Hiroshi Tsuruoka
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Simulation
• momentum resolution momentum (GeV/c)
(dP/P)
with GEANT/pisa + reconstruction
with T0
without T0
no mult. scatt.
T0 (thickness :1.5cm)
Akio Kiyomichi, Miwako Suzuki, Ayako Danmura
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Photon conversion rejector
• thin scintillator in front of T0
• to reject photon conversion at T0
• high efficiency and low BG
e e e
T0
DC/PC
RICH
TEC/TOF
PCR
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Test setupπ -(2 GeV/c )
PMT
Plastic Scintillator(BC 404,BC408)
pedestal
13 photons
WLS-fiber( BCF-92)
Ayako Danmura
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Comparison with simulation
dEdx from GEANT<Npe> from experimentPoisson statisticscount efficiency with Npe threshold
0.0 0.2 0.4
1
Ayako Danmura
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Signal/noise for to ee
Thickness (cm)
Thickness (cm)
Ayako Danmura
Signal
Noise S2/N
S2/(2N+S) N’=N/10 N’=N/100
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Hiroshi Tsuruoka
Mechanical design
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Summary
• Time resolution about 60ps
• It does not depend on position nor B-field
• Fine mesh 2inch PMT (R5924) x25 ordered
• 1.5x8x100(cm3) and 10cm light guide x8 slats
• Readout electronics (8ch x 3) from BBC
• Photon conversion rejector option? (read-out)
• Removable T0 only for hadron PID run?
Open questions
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fine mesh 2inch PMT (R5924) x25 ordered
PMT delivery
scintillator and light guide order
mechanical structure design and order
shipping all the materials to BNL
assembly
installation after heavy ion run
one week access to complete
Schedule2001.1
2001.3
2001.4
2001.6
2001.8