besiii 宇宙线实验 朱科军 高能物理研究所. bepcii project luminosity: 3~10×10 32 cm -2...
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BESIII宇宙线实验
朱科军高能物理研究所
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BEPCII Project
Luminosity: 3~10×1032cm-2s-1 @ 3.77GeV
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Milestones Barrel EMC and electronics was ready on 11/30/2007 Trigger system for EMC was ready on 11/30/2007 Started MUON test since 12/3/2007 Barrel TOF and electronics was ready on 12/20/2007 MDC and electronics was ready on 1/2/2008 Cosmic ray w/o end-cap seen on 1/6/2008 End-cap of EMC and TOF was ready on 2/12/2008 Cosmic ray with full detector seen on 2/14/2008 Cosmic ray data taking finished on 3/16/2008 Moved to the BEPCII IR by mid-April, 2008 Data taking is expected around mid-June, 2008.
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System overview
TOF Electronics
MDC Electronics
TOF Trigger
MDC Trigger
Global Trigger &
Fast Control
MDC Electronics
Fanout
T0
Optical Fiber Cable
L1*
EMC Electronics
MU Electronics
MU Trigger
EMC Trigger
MDC Electronics
Fanout
MDC Electronics
Fanout
MDC Electronics
Fanout
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触发条件和定时 00 to 15 :::::: EMC 00 : NCluster >= 1 01 : NCluster >= 2 02 : Barrel Cluster back to back 03 : Endcap Cluster back to back 04 : Cluster Balance in Z direction 05 : Barrel Cluster Balance in Phi direction 06 : Endcap Cluster phi Balance 07 : Barrel total Energy Higher threshold 08 : Endcap total Energy Higher threshold 09 : total Energy Lower threshold 10 : total Energy Middle threshold 11 : Energy Balance in "Z" direction 12 : Barrel Energy difference Balance 13 : Endcap Energy difference Balance 14 : Energy Block Balance 15 : Endcap Energy Balance
16 to 21 :::::: TOF 16 : Endcap TOF back to back 17 : Barrel TOF back to back 18 : NETOF >= 2 19 : NETOF >= 1 20 : NBTOF >= 2 21 : NBTOF >= 1 (0x15) 32 to 37 :::::: MUON 32 : MUON Back to Back 3478 33 : MUON Back to Back 37 38 to 47 :::::: MDC 38 : Short Track back to back 39 : NStrk >= N 40 : NStrk >= 2 41 : NStrk >= 1 42 : Long Track back to back 43 : NLtrk >= N 44 : NLtrk >= 2 45 : NLtrk >= 1 46 : NItrk >= 1 47 : NItrk >= 2
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触发道 0x1 => EMC Ncluster >= 1 0x2 => NBTOF >= 1 0x4 => BTOF back to back 0x8 => EMC Cluster back to back 0x10 => Short Track Back to Back 0x20 => Long Track Back to Back && BTOF Back to
Back 0x100 => BTOF back to back && Ncluster >= 1 0x200 => random trigger 0x400 => Long Track Back to Back && NCluster >= 1 0x800 => NLtrk >= 1 0x1000 => MUON Back to Back 3478 0x2000 => MUON Back to Back 37 0x4000 => NBTOF >= 1 && NClus >= 1 0x8000 => NLtrk >= N
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Run2414: 2008-03-06 18:17 to 03-07 09:00
Trigger channels: 0x441cEndcap Cluster phi Balance
Long Track Back to Back && NCluster >= 1
ETOF back to back
EMC Cluster back to back
BTOF back to back
Timing: 0x8022a11Barrel TOF back to back
Long Track back to back
Barrel Cluster back to back
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时间低阈的选取
在 3# 厅进行的宇宙线测试中,按噪声水平 1% 为标准,设置的时间低阈为内室 110 ; 台阶 70 ; 大端板 50内室 120 ; 台阶 80 ; 大端板 60 ( 数据分析得到的理想低阈 )
当前条件下,如果按 1% 的标准,时间低阈应为内室 100 ; 台阶 70 ; 大端板 40
随机触发,设置时间道高低阈相等,在不同时间阈值下测量漂移室各通道的时间计数,计数值阈触发数之比反映了漂移室在该时间阈下的噪声计数水平
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Hitmap and distribution of T and Q (run1963)
T hitmap Q hitmap
T distribution Q distribution
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Drift distance (mm)
Dri
ft ti
me
(ns)
Time-to-distance relation(layer 12)
Drift time (ns)
Ent
ries
Distribution of drift time(layer 12)
Results of calibration and reconstruction
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Spatial resolution(after calibration and alignment)
• HV: 2150V
• T threshold:
120/150(inner section), 80/110(stepped section), 60/80(outer section)
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Spatial resolution vs layer
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Efficiency vs layer
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TOF Calibration Using Cosmic Ray Data
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Time Difference of Each Counter
The distribution of sum time of two end. The fitting function isError Function.
x 2x dxe
2
1xD
22
')( )/()'(
Mean value vs counter number
Sigma value vs counter number
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T0 Extract
σ=317ps σ=164ps
σ=283psOriginal T0
T0 after calibration
T0 Difference before and after T0 extract
Delta T distribution before and after T0 extract
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Single End Readout Time Resolution (Preliminary!)
East and West end readout time resolution with unit/ps
Using time difference of each counter and T0 extraction, with an approximation of β = 0.99, the single end readout time resolution are shown.
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• event Selection
– EMCb2b
– Energy of digi>10MeV, and only two digis
• Check ADC(MeV) distribution for each crystal
– First calibrated by using relative light yield data,
– and comparison with the MCdata
• Finally give the Preliminarycalibration constant for every crystal
How to calibrate by using cosmic rawdata
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Hitmap of sample events
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宇宙线事例: EMC b2b 触发 选择只击中两块晶体的事例
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ADC (MeV) vs nphi
Barrel light yield by PMT
crystal-per
lightyieldlightyield lightyield
meanCalibConst
PMT RLY calibrationNo calibration
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No-calib
Sig/mean=
32.57/239.7=13.6%
PMT RLY calib
Sig/mean=
26.95/265.8=10.1%
Cosmic RLY calib
Sig/mean=
29.59/265=11.2%
Fiber RLY calib
Sig/mean=
29.01/262.3=11.1%
Barrel_all
Preliminary results only using relative light yield data
Gaus_landau fitting
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adc2-28l-2930
Mean=267MeV
Phi=29&30
Mean/RMS=
187.6/19.55
RawDataMCData
C1=Mean_mc/Mean_raw~188/267=0.7
1Cyieldlight relative
yield)light iveMean(relattCalib.Cons
First calibration by Cosmic rawdata
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Cosmic_mc Cosmic_rawdata , barrel_all
The22&phi29
Sig/mean=
11.38/182.1
=6.25%
Barrel_all
Sig/mean=
12.34/184.4
=6.7%
Only relative light yield by PMT testSig/Mean=27/265.9=10.1%
relative light yield by PMT test +mc_calibSig/Mean=16.7/183.4=9.1%
Preliminary results using relative light yield data & MC_calib
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Barrel_all Barrel_28cm Barrel_24cmBarrel_ntheta2
1Barrel_nthe21&
nphi29
Cosmic Rawdata
32.57/239.7=13.6%
32.56/239.6
=13.6%
27.57/247.7
=11.1%
22.84/228.7
=10%
Relatvie light yield
calib(PMT)
27/265.9
=10.1%
26.63/266.2
=10%
21.28/216.1
=9.85%
24.97/266.8
=9.36%
26.5/293.9
=9%
Relatvie light yield
calib(PMT) +mc_calib
16.7/183.4
=9.1%
16.52/183.6
=9%
15.23/158.3
=9.6%
16.23/182.4
=8.9%
16.55/183.6
=9%
Mc simulation 12.23/184.2=
6.64%11.93/184.3
=6.47%
10.95/158.4
=6.91%
11.75/183.1
=6.42%6.25%
Sigma/mean by Gaus+landau fit
Preliminary results
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By layer By segment
Hit map
Hit maps show pretty well, noise and dead channel have been checked and repaired
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Counting rate
Trigger rate: 75~90Hz, Counting rate of MUC at 10-4 Hz/cm2 level
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总结 BESIII 宇宙线调试总的来说进展顺利 已获取一定数量的宇宙线事例供离线进
行软件调试和探测器性能的初步研究,帮助查找硬件中存在的问题
下月初进行第二轮宇宙线测试 准备迎接对撞取数
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谢谢