Preliminary Results of BES3 TOF (Endcap) Simulation

Preliminary Results of BES3 TOF (Endcap) Simulation

BES-III TOF (Endcap) TOF Time resolution for BESIII/TOF. Non TOF ~60ps Item Barrel time

reso. Endcap time reso. Intrinsic time reso. of one TOF layer for 1 GeV muon 80~90 ps 80 ps Uncertainty from electronics

25 ps 25 ps Uncertainty from bunch length 15 mm 35 ps 15 mm 35 ps

Uncertainty from bunch time ~20 ps ~20 ps Uncertainty from Z position 5 mm,25 ps 10 mm,50 ps Resolution of expected time of flight

30 ps 30 ps Total time reso, one layer of TOF for 1 GeV 100~110 ps 110~120 ps Total time reso, double layer of TOF

for 1 GeV 90 ps LI Cheng / USTC 2008.4 PMT 2003 2006 1 2 3

LI Cheng / USTC 2008.4 Configuration 800 966 1676 The Endcap TOF ETOF of Beijing Spectrometer(BESIII) is consisted of 2*48 pieces of trapezoidal scintillator . Its main p hysics goal is to realize the separation at momentum up to 1Gev/c, and the intrinsic time resolution reach to 80ps. LI Cheng / USTC 2008.4

1 R5924 PMT-base Base PMT 2 PMT Fine Mesh PMT PMT ( ) ( ~3%) PMT 3 50ps PMT 2-4

4 LI Cheng / USTC 2008.4 PMT Base PMT LI Cheng / USTC 2008.4 PMT

<1.5ns 4.0ns . CHERENKOV R5924 FWHM 460ps. LI Cheng / USTC 2008.4 PMT Gain Measurement ~3% The gain measured of R5924 PMT with three methods

SPE method With LSO crystal With XP2262 PMT From Hama mashu PMT01 2107

0.53 3.8 107 3.0 107 PMT02 1.45107 N/A 3.2 107

2.3 107 PMT03 2.7 107 1.0 8.2 107 4.7 107

PMT04 N/A 0.49 N/A 2.4 107 LI Cheng / USTC 2008.4 The gain in magnetic field

The spectrum of pulse magnitude measured with the LSO crystal in magnetic field at IHEP The gain decrease in 48 times at 1T and the angle of zero degree LI Cheng / USTC 2008.4

PMT measured for 1T at KEK by Tokyo Univ. LI Cheng / USTC 2008.4 Cosmic test The energy deposit in ETOF for MIP LI Cheng / USTC 2008.4

, BC404 50mm . 1.5GeV LI Cheng / USTC 2008.4 Test Results(1) The primary results show

that the time resolution o f ETOF(BC408) with Tyv ek paper wrapped is bet ween 75-90ps. LI Cheng / USTC 2008.4 Test Results (2) The beam tested results show that the time resolution of ETOF(BC404) with ESR film wrapped is between <80ps.

LI Cheng / USTC 2008.4 1. PMT 2 PMT PMT , 3 LI Cheng / USTC 2008.4

The Layout of ETOF scintilla tor bar LI Cheng / USTC 2008.4 4 80mm 431 mm, ETOF

LI Cheng / USTC 2008.4 BC404 98 LI Cheng / USTC 2008.4 PMT5924 R5924 113

5*105 5*106 PMT LI Cheng / USTC 2008.4 Batch Test of the PMT Gain The gain curve of R5924/PMT un der different high voltages.

The voltages at which the gain reaches 5105 and 5106 LI Cheng / USTC 2008.4 PMT 120 PMT PMT

LI Cheng / USTC 2008.4 RF 96 RS PMT PMT

LI Cheng / USTC 2008.4 - A1

+ + A2 -

1 PMT 2 18 18 3 TOF LI Cheng / USTC 2008.4

ETOF LI Cheng / USTC 2008.4

LI Cheng / USTC 2008.4 ETOF Cabling & Grounding LI Cheng / USTC 2008.4

EMC LI Cheng / USTC 2008.4 Fiber Connecting Cooperated with Hawaii University LI Cheng / USTC 2008.4 ETOF 07.12 08.2

1 0mV LI Cheng / USTC 2008.4 End cap single LI Cheng / USTC 2008.4 Q measurement Total 4 dead

Channels! Pre-amp? LI Cheng / USTC 2008.4 Q mean LI Cheng / USTC 2008.4 Time measurement LI Cheng / USTC 2008.4

T sigma after Q-T LI Cheng / USTC 2008.4 ETOF ETOF BESIII ETOF , , , , ! LI Cheng / USTC 2008.4

BESIII LI Cheng / USTC 2008.4

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