Performance of High Resolution Time-of-Flightdetector for Study of Identified Hadron Production
at RHIC-PHENIX experiment
Univ.of Tsukuba:
A.Kiyomichi, M.Aizawa, M.Ono, S.Kato, H.Sako, S.Sato, M.Suzuki,T.Chujo, H,Tsuruoka, Y.Miake and PHENIX Collaboration
JPS meeting @Niigata University•PHENIX-TOF•Basic Design•Construction/Operation•Performance•Summary

JPS '00 @Niigata Univ.

Sep. 23, 2000

PHENIX-TOF

Panel: 96 slats
Slat: Plastic scintillator w. 2 PMT’s
385cm

200cm

200cm

• 960 plastic scintillators with 1920 PMT’s• locate at 5m from the vertex• Acceptance : driven by HBT and f meson∆θ = 40o, ∆ϕ = 45o, Ω ~1/3 Sr
2Akio Kiyomichi [Univ. of Tsukuba]

JPS '00 @Niigata Univ.

Sep. 23, 2000

Particle Identification using TOF
TOF
Time Resolution: σ ~ 80 ps
π / K separation to 2.4 GeV/c
K / p,p separation to 4.0 GeV/c
TOF performance at WA98
(1996)

σ ~ 85ps

Time-of-Flight [ns]Used high momentum π
TOF resolution for all 500 slats• WA98 used 5 panels of PHENIX TOF system.

3

Akio Kiyomichi [Univ. of Tsukuba]

JPS '00 @Niigata Univ.

Sep. 23, 2000

Basic Design
PMT:R3478
Scinti.:BC404
TimingPulse Height(t0 , x){{t1 = t0 + x / vlightt 2 = t 0 + (l − x) / vlightx
a1 = a0 exp(− )λ{∴t +tt0 = 1 2 − l / vlight2t −tx = 1 2 vlight
2a2 = a0 exp(−δt 0 = (δt1 2 δt 2 2 δt1) +( ) ≅222δx = vlight (l−x)λ80 psδt1 2 δt 2 2 vlight δt1) +( ) ≅2221.3 cm• Precise TOF & Hit position• Typical resolution– Electronic pulse at Discr. : < 25 ps– Laser Pulse on PMT: 50 ~ 100 ps• Double hit– Lose timing information

4

Akio Kiyomichi [Univ. of Tsukuba]

JPS '00 @Niigata Univ.

Sep. 23, 2000

FEE

5

Akio Kiyomichi [Univ. of Tsukuba]

JPS '00 @Niigata Univ.

Sep. 23, 2000

Construction at Tsukuba (1996-1998)

6

Akio Kiyomichi [Univ. of Tsukuba]

JPS '00 @Niigata Univ.

Sep. 23, 2000

Construction at BNL (1998-1999)• PMT installation• Cable Assemble• Signal Check

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Akio Kiyomichi [Univ. of Tsukuba]

JPS '00 @Niigata Univ.

Sep. 23, 2000

Instoration in PHENIX(August 1999)• All 10 panels were installed.

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Akio Kiyomichi [Univ. of Tsukuba]

JPS '00 @Niigata Univ.

Sep. 23, 2000

Operation at PHENIX year1
Detector instrumented
Detector installed

Pc 3

cPbS

Pb Sc

Pb
Sc

Install in summer 2000

ScPb

TEC

DC

Pc1

Pb Gl

Sc
Pb

DC

RICH

MVD

PbG l

PbSc

RICH

Pc1

Pc2
Pc3
ToF

WestEast

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Akio Kiyomichi [Univ. of Tsukuba]

JPS '00 @Niigata Univ.

Sep. 23, 2000

Track matching andTOF intrinsic timing resolution

σ ~ 120 ps•

σTOF-TEC = 2cm:– Corresponding timing
resolution is 120 ps.
– 120 ps is consistent with TOF
intrinsic timing resolution forNO slewing correction.

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Akio Kiyomichi [Univ. of Tsukuba]

JPS '00 @Niigata Univ.

Sep. 23, 2000

Particle Identification• We can see clear π,K,p separation• No Slewing correction

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Akio Kiyomichi [Univ. of Tsukuba]

JPS '00 @Niigata Univ.

Sep. 23, 2000

TOF resolution

σ ~ 170 ps• Select High-momentum pion.
• Current Time of Flight resolution is ~170ps.
– BBC, TOF, Tracking Chamber

• aaa
• bbb

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Akio Kiyomichi [Univ. of Tsukuba]

JPS '00 @Niigata Univ.

Sep. 23, 2000

Summary• TOF intrinsic timing resolution is 120 ps fromTEC/TOF matching without slewing correction.
• Time-of-Flight resolution is 170 ps

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Akio Kiyomichi [Univ. of Tsukuba]