Performance of High Resolution Time-of-Flight detector for ...
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Performance of High Resolution Time-of-Flight detector for Study of Identified Hadron Production at RHIC-PHENIX experiment •PHENIX-TOF •Basic Design •Construction/Operation •Performance •Summary 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
Transcript of Performance of High Resolution Time-of-Flight detector for ...
Performance of High Resolution Time-of-Flightdetector for Study of Identified Hadron Productionat RHIC-PHENIX experiment
•PHENIX-TOF
•Basic Design
•Construction/Operation
•Performance
•Summary
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
JPS '00 @Niigata Univ. Sep. 23, 2000
Akio Kiyomichi [Univ. of Tsukuba]2
PHENIX-TOF
• 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
Slat: Plastic scintillator w. 2 PMT’sPanel: 96 slats
385cm
200cm
200cm
JPS '00 @Niigata Univ. Sep. 23, 2000
Akio Kiyomichi [Univ. of Tsukuba]3
Particle Identification using TOF
TOFTime Resolution: σ ~ 80 psπ / K separation to 2.4 GeV/cK / p,p separation to 4.0 GeV/c
σ ~ 85ps
Time-of-Flight [ns]
Used high momentum πTOF resolution for all 500 slats
TOF performance at WA98(1996)
• WA98 used 5 panels of PHENIX TOF system.
JPS '00 @Niigata Univ. Sep. 23, 2000
Akio Kiyomichi [Univ. of Tsukuba]4
Basic Design
• Precise TOF & Hit position
• Typical resolution– Electronic pulse at Discr. : < 25 ps
– Laser Pulse on PMT: 50 ~ 100 ps
• Double hit– Lose timing information
light
light
vtt
x
vltt
t
2
/2
21
210
−=
−+=
),( 0 xt
)exp(
/
01
01
λx
aa
vxtt light
−=
+=
TimingPulse Height
)exp(
/)(
02
02
λxl
aa
vxltt light
−−=
−+=
2)
2()
2(
2)
2()
2(
12221
122210
tvttvx
tttt
lightlight
δδδδ
δδδδ
≅+=
≅+=
PMT:R3478Scinti.:BC404
∴ 80 ps
1.3 cm
JPS '00 @Niigata Univ. Sep. 23, 2000
Akio Kiyomichi [Univ. of Tsukuba]5
FEE
JPS '00 @Niigata Univ. Sep. 23, 2000
Akio Kiyomichi [Univ. of Tsukuba]6
Construction at Tsukuba (1996-1998)
JPS '00 @Niigata Univ. Sep. 23, 2000
Akio Kiyomichi [Univ. of Tsukuba]7
Construction at BNL (1998-1999)
• PMT installation
• Cable Assemble
• Signal Check
JPS '00 @Niigata Univ. Sep. 23, 2000
Akio Kiyomichi [Univ. of Tsukuba]8
Instoration in PHENIX(August 1999)
• All 10 panels were installed.
JPS '00 @Niigata Univ. Sep. 23, 2000
Akio Kiyomichi [Univ. of Tsukuba]9
Operation at PHENIX year1
West East
PbSc
PbSc
PbSc
PbSc
Install in summer 2000
Detector instrumented
Pc1Pc1
RICH RICH
TEC
ToF
PbSc
PbSc
PbGl
PbGl
DCDC
Pc 3 Detector installed
Pc2
Pc3
MVD
JPS '00 @Niigata Univ. Sep. 23, 2000
Akio Kiyomichi [Univ. of Tsukuba]10
Track matching andTOF intrinsic timing resolution
• σTOF-TEC = 2cm:– Corresponding timing
resolution is 120 ps.
– 120 ps is consistent with TOFintrinsic timing resolution forNO slewing correction.
σσσσ ~ 120 ps
JPS '00 @Niigata Univ. Sep. 23, 2000
Akio Kiyomichi [Univ. of Tsukuba]11
Particle Identification
• We can see clear π,K,p separation
• No Slewing correction
JPS '00 @Niigata Univ. Sep. 23, 2000
Akio Kiyomichi [Univ. of Tsukuba]12
TOF resolution
• Select High-momentum pion.
• Current Time of Flight resolution is ~170ps.– BBC, TOF, Tracking Chamber
• aaa
• bbb
σσσσ ~ 170 ps
JPS '00 @Niigata Univ. Sep. 23, 2000
Akio Kiyomichi [Univ. of Tsukuba]13
Summary
• TOF intrinsic timing resolution is 120 ps fromTEC/TOF matching without slewing correction.
• Time-of-Flight resolution is 170 ps
