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ALICE 実験のための PWO カロリメータの 宇宙線を用いたエネルギー較正. 広大理 尾林秀幸 岩崎天 植木祐介 坂口拓明 志垣賢太 杉立徹 中馬文広 鳥井久行 日浅貴啓 日栄綾子 翠純平 2010 年 3 月 22 日 日本物理学会 2010 年春季大会( @ 岡山). 内容. LHC/ALICE/PHOS 本実験の目的 テストベンチ 解析手法 結果とまとめ. Heavy Ion Collisions at LHC. p+p s = 14 TeV - PowerPoint PPT Presentation
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ALICEPWO
20103222010@
2010/3/222010 JPS1LHC/ALICE/PHOS
2010/3/222010 JPS2Heavy Ion Collisions at LHC2010/3/222010 JPS33/22/2010JPS 20103
p+p s =14 TeVPb+PbsNN=5.5 TeV
EnergyLHC = 28 x RHIC =320 x SPS = 1000 x AGS3/22/2010JPS 201044
Detector:Size: 16 x 26 metersWeight: 10,000 tonsCollaboration:> 1000 Members> 100 Institutes > 30 countries
4
PHOS
//
PHOS
(QGP)100 QGP!!
3/22/2010JPS 2010PbWO4 CrystalFast Signal (~nsec)Operation at -25degSmall Moliere Radius (2cm) Good 2 photon Separation
PHOS
5PbWO4 CrystalFast Signal (~nsec)Operation at -25degSmall Moliere Radius (2cm) Good 2 photon SeparationAvalanche Photo Diode (APD)High Q.E.(60%-80%)Thin photo-sensorOperational in magnetic field
PbW04 crystal18cm2.2x2.2cm2
APD: Hamamatsu S8148/S8664-555x5mm2x2cm5PHOS164*56=3584PWOAPD()CSP()
PHOS:PWO -> ->
APD-> (PMT)(10^4~10^6)(10~10^4)
Charge Sensitive Preamplifier(CSP)5ALICEPHOS
PHOS
PHOS
3/22/2010JPS 20106PHOS
63/22/2010JPS 20107HV-1500 V, -1550 V
PHOS
PHOS
7PHOSTest BenchPWO -> APD -> CSP -> (FEE)
Test BenchPHOS
Test Bench2PWOAPDCSP-25
// (1)PWO(2)(3)
3/22/2010JPS 20109
ADC countADC count100 ns / count100 ns / count
ADC countADC count100 ns / count100 ns / count9PWO-> APD-> CSP(p0)-> FEE(70 counts)
3/22/2010JPS 201010PWOPWO()()
8(A) 2(B)
= 20rate ~ 1.34 10-4 sec-1 ( 12 events / crystal) PWO() 0.5 1 0
1.5 20 0.8
0.6 1 0.2
: > Threshold(A): < Threshold(B)
= ()103/22/2010JPS 201011rate ~ 3.35 10-3 sec-1 ( 290 events / crystal) 3 33
2 3 1
2 10 7
1 5 3
: > Threshold(A): > Threshold(C)
= () + ()()
8(A) 4(C)
p0 = 10+5+7 = 2211JPS 201012
Threshold(A) > 8 [ADC count]
Threshold(C) > 4 [ADC count]
29
: 30.3
: 18.4
/ E: 0.27 (@ )
APD
()3/22/2010
Threshold(A) > 8 [ADC count]
Threshold(B) < 2 [ADC count]
29
: 32.3
: 22.9
/ E: 0.14 (@ )
12291
3/22/2010JPS 201013APD(1)
Threshold(A) > 8 [ADC count]
Threshold(C) > 4 [ADC count]
29
: 39.1
: 4.6
/ E: 0.20 (@ )
Threshold(A) > 8 [ADC count]
Threshold(B) < 2 [ADC count]
29
: 38.1
: 6.2
/ E: 0.14 (@ )HV*133/22/2010JPS 201014APD(2)
Threshold(A) > 8 [ADC count]
Threshold(C) > 4 [ADC count]
29
: 32.8
: 1.3
/ E: 0.21 (@ )
Threshold(A) > 8 [ADC count]
Threshold(B) < 2 [ADC count]
29
: 31.6
: 2.0
/ E: 0.18 (@ )HV*14/()(@ )0.73/22/2010JPS 20101515PHOS
MIP6.3%3.9%250.7
ALICE3/22/2010JPS 201016Back up3/22/2010JPS 2010173/22/2010JPS 201018[g/cm3][cm][cm][ns][NaI]PWO8.280.892.05~150.01BGO7.131.122.43000.15NaI3.672.594.52501.00CsI4.531.853.85650.40PWO: : 18
PWOAPD CSPFEE board
(1) (2) APD(3) CSP(4) FEE3/22/2010JPS 20101919PHOS / 3/22/2010JPS 201020
PWOAPD CSPFEE board
(1) (2) (3)
ALICEL3PHOS: 3584/1 module: 2920FEE board
3/22/2010JPS 201022
p0:
P1:
p2:
p3:
p4: Sampling ADC1522f(x)=Amp*t^N*exp(-N*t)+Ped, where t=(x-Tpre)/Tau
(MIP)
E=dE/dx L=9.4[MeV/cm] 18[cm]=169.2[MeV](34[ADC count] @ 50)3/22/2010JPS 201023
PbW04 crystalL = 18cm2.2x2.2cm2dE/dx = 9.4 MeV/cm
1[ADC count] 5[MeV]
PWO
E/E ~ 0.14 E/E ~ 0.203/22/2010JPS 201024243/22/2010JPS 201025PWOAPDCSPFEE: ~4GeVPWOLED: ~eVPWOLED25HVHV(1)HV(2)195k109k103k179.59APDHV3/22/2010JPS 20102626HVLEDAPDHV-p034[ADC count]APDHV
HVp034APD(@ (0,13))LEDp020105p034180HVHV3/22/2010JPS 20102727/Threshold(A)
3/22/2010JPS 201028
99%Threshold(A)
4~10 ADC count(20~50 MeV @ gain 50)020p028Threshold8.68.39.94.91.49.55.84.84.97.44.58.78.14.79.08.37.98.24.24.97.38.48.58.37.98.28.45.18.47.93/22/2010JPS 201029Threshold(A)Threshold(B,C)2.04.0 [ADC count]100%((7,12))()Test Bench()29APD311345319348-3523583463603363163553483523413063123073363393093123153423323003133033423283/22/2010JPS 201030[V]HV30APD342334310370-3453753723733553523673633673553363103363583603392852903203422882933333203003/22/2010JPS 201031[V]HV(1)31APD335327304368-3363793783783563423693663723543223043243603603252872903143442952923233243033/22/2010JPS 201032[V]HV(2)32