Aerogel RICH counter のための Geiger mode APD の性能評価と光学デザイン

Aerogel RICH counterGeiger mode APDGeiger mode APDAerogel RICH counter N

K/p Aerogel RICH counter(P>2GeV/c)KEKB : B BCPBelle : BK/p Cherenkov counter(P4GeV/c) 28cm1mB=1.5T(Ring Imaging CHerenkov)Endcap

Aerogel RICH counter 1.5T 5mm/ 15% Geiger mode APDBeam test 8.5 4.4mrad (3GeV/c, Aerogel 30mm PMT200mmqcqc qcK23mradPMT() Aerogel Cherenkov CherenkovqcK/Aerogel RICH counter120cm

Aerogel RICH Aerogel RICH 1mm2Geiger mode APD(%)100050

New Old20mm Geiger mode APD1mm

H100-oldH400-oldH100-new1,2H400-new1,21.0x1.0mm220052006100400100400(%)--78.561.5

Geiger mode APD pedestal2pe3peH100-old, Vbias=71.5V, noise1.0MHzmeanped: 98.9 mean1pe: 137.1 sped: 3.0 PMT(S/N3) 1 1x65=1.8x106 1S/N=mean/s=11.6

Geiger mode APD 102psH100-old, Vbias=71.5V, noise1.0MHzPMTs300ps 100ps

K,p300ps @1.5GeV/cTDC

Geiger mode APD 5mm/ 160mm1ns10mV/div 1ns/divamp x65111/2 digitize1 1MHzCherenkov 4MHzGeiger mode APD

(MHz)/160mm()1144

Geiger mode APD 4 Cherenkov100pixel type: @3.6x106600kHz 400pixel type: @1.5x106400kHz1MHz 4 1/31MHz203

Aerogel RICHGeiger mode APD (5mm10) Geant42mm5mm/Geiger mode APD1mm2

12mm9mm 0.3rad 400nm 1.475mm5mm2mm2mmlengthlength

Geiger mode APDAerogel RICH P=3.0GeV/c Aerogel 1.04730mm 36.3mm(@l=400nm)CherenkovRayleigh20cm

Geiger mode APD PMTGeiger mode APDPMT4Aerogel30mm 1Geiger mode APD PMT PMT8.5Geiger mode APD32.1CherenkovAerogel Geiger mode APD

Aerogel RICH counterGeiger mode APD 2mm5mm Geiger mode APD 8.5324Geiger mode APD1mm PMT (100ps) =460nm45% ! PMT 1.5x106400kHzAerogel RICH counter

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Aerogel RICH counter :qc1 : : NpepKAerogel Photon detectorAerogel Photon detector Proximity focusingProximity focusing ( : 1.05P = 4GeV/c)

Geiger mode APDAerogel RICH counterK/p(3GeV/c, Aerogel 30mm)Geiger mode APD 4GeV/cK/p5.2s10.1sstrack1 s1pe1 Npe1

Npe strack (mrad)4GeV/cSPMT8.54.45.2s+Geiger mode APD32.12.310.1s

Geiger mode APDAerogel RICH counter160mmCherenkov 2.5K/p2mm(3GeV/c, Aerogel 30mm)Geiger mode APD 4GeV/cK/p5.2s10.1sstrack1 s1pe1

H100-new2070.5V1ns2.5MHz3.6x106 65%

Npe strack (mrad)4GeV/cSPMT8.54.45.2s+Geiger mode APD32.12.310.1s

Aerogel RICH counter

APD() Si3.6eV

Geiger mode APD Geiger(Vbreak) VbreakVover (Vover=Vbias-Vbreak) 20101/2 -40kHzVover

Si1.12eV 0.025eV @T=300K p(T)C T Eg kBoltzman

Geiger mode APD Q=C(Vbias-Vbreak) VbreakC100pixelC230fC400pixelC70fC

(V)H100-old70.3H400-old67.7H100-new168.4H100-new268.3H400-new168.4H400-new268.3

endcap0.30.6rad1734 Cherenkov0.3radP=4GeV/c 0.00.6rad(034)Geiger mode APD 0.3rad0.3rad0.4rad70%0.3rad

1mm40% 1mm 2mm0.3rad 400nm 1.47

AerogelAerogel Npe

Geiger mode APDPMT4PMT1.6Geiger mode APD1.6

K/p(TOF)TOF300ps @ BelleK/p K/pGeiger mode APD 100ps

Geiger mode APD Sample: H100-old, noise:1.0MHz PMT100ps

(l=635nm) : Geiger drift TDC(l=405nm) : Geiger TDC, Geiger s reference: ICFA Instrum.Bull.23:28-41,2001Geiger mode APD a = f (l)(mm) R&D

l (nm)s(ps)tail(ns)a(mm)410140~0.50.1663970~43.65

RICHGeiger mode APDMatrixAPDGeiger mode APDGeiger mode APDAerogel RICHGeiger mode APDAerogel RICHS/NPMTRun960 H100-old laserADCPMTTOFRun960 H100-old laserPMTAerogel RICH1mm40% 1mm2mm100%PMTGeiger mode APDPMT4Geiger mode APDAerogel RICHGeiger mode APDRICH0.25%11pe=12.8G-APDS/NPMTS/N=32.1/2.513PMTs1pePMT

0.25%11pe=12.8G-APDS/NPMTS/N=32.1/2.513PMTs1pePMT