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Test results and status on T0. ShinIchi Esumi Inst. of Physics, Univ. of Tsukuba. test experiment at KEK-PS analysis results and simulations photon conversion rejection Summary, open questions and plan. T0: start counter for pp collisions. Proposed. T0 in PHENIX. T0. TOF. - PowerPoint PPT Presentation
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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
ProposedT0 in
PHENIX
TOF
T0
Hiroshi Tsuruoka, Masaya Ono
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.
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
HV/position dependence
Masaya Ono, Hiroshi Tsuruoka
Thickness/width/light guide dependence
Masaya Ono, Hiroshi Tsuruoka
B-field dependence
Masaya Ono, Hiroshi Tsuruoka
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
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
Test setupπ -(2 GeV/c )
PMT
Plastic Scintillator(BC 404,BC408)
pedestal
13 photons
WLS-fiber( BCF-92)
Ayako Danmura
Comparison with simulation
dEdx from GEANT<Npe> from experimentPoisson statisticscount efficiency with Npe threshold
0.0 0.2 0.4
1
Ayako Danmura
Signal/noise for to ee
Thickness (cm)
Thickness (cm)
Ayako Danmura
Signal
Noise S2/N
S2/(2N+S) N’=N/10 N’=N/100
Hiroshi Tsuruoka
Mechanical design
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
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