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Study of the Spatial Resolution and Muon Tomographic Imaging Properties of Glass RPCs
Speaker: Dr. Qite Li 李奇特 Co-author: Prof. Yanlin Ye, Jing Ma, Jian Gao, Kaiyao Jiang, Cidong Chen, Xiaonan Xie Peking University 北京大学
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Knowledge is Power Sir Francis Bacon (1561-1626)
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Nuclear Knowledge can be the Power of
Peace Happiness Fear Frustration
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Uranium 90% (HEU) Pu % (WGPu) 26 kg HEU / 5kg WGPu 11 cm / 6 cm box
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2.3mrad 10mrad 20mrad ~1.1° ~GeV Muon 1/cm2/min
Muon Tomography(MT) water Fe W 10cm 2.3mrad 10mrad 20mrad ~1.1° ~GeV Muon 1/cm2/min
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Requirements of Detectors for MT
Large Area (~1m2) High Detction Efficiency (>90%) High Spatial Resolution (~1mm) Cost-effective Peking University
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Los Alamos (2003): Drift Tubes
MT Station Examples Los Alamos (2003): Drift Tubes INFN : CMS Muon Barrel Chambers Nucl. Inst. and Meth. A 604 (2009) FIT : Triple GEMs Nucl. Inst. and Meth. A 652 (2012) 16-20 Science and Global Security 16 (2008) 37–53 ~1000 electronic channels
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1k~10k electronic channels
MT Station Examples Los Alamos: Mini Muon Tracker INFN & Univ. Catania : Muon Portal Project FIT : Triple GEMs Nucl. Inst. and Meth. A 652 (2012) 16-20 1k~10k electronic channels
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RPC Resistive Plate Chamber R. Santonico(in 1980s)
Large Area ~ m2 Good Time Solution~1ns Acceptable Spatial Resolution ~mm ~cm CMS Muon Trigger RPCs by PKU (2002)
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Combination of RPC & Delay-line Readout
90% R134a+9% C4H10+1% SF ml/Min
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Induced Charge Profile Measurement
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General Properties: Signals
Avalenche Signal Avalenche +Streamer Signal
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General Properties: Detection Efficiency
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Induced Charge Profile Measurement
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2.54 mm pitch readout strips
Reducing System Nonlinearity 减小读出条读出非线性 GC Smith,et al. IEEE TNS. 1988,35(1):409–413 2.54 mm pitch readout strips
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Spatial Resolution Measurement
Residual Method ΔX=X2-(X1+X3)/2
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Spatial Resolution of Glass RPCs
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MT Station with three 2D-Glass RPCs (2012) 12+2 channels
Material
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PKU some 3*3*3cm3 Fe blocks
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Preliminary 3D Imaging Result (2013~2014)
RPC mm*203mm RPC mm*203mm RPC mm*203mm RPC 4 203mm*203mm Material
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Pb & Fe cubes (data of 4 days, PoCA imaging)
x z Preliminary Preliminary Preliminary
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Pb or Wood in Fe cube Preliminary Preliminary Preliminary Preliminary
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Very good agreement with GEANT4 Simulation
x z y x z Preliminary Preliminary Preliminary Preliminary Preliminary Preliminary
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Future Plan/ Ongoing Extend RPC to 1m*1m Pure R134a gas flow
will give us 24x useful events Pure R134a gas flow eff~92%, res~0.5mm (sigma)
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Conclusions Glass RPCs with LC Delay-line Readout
Simple structrue, stable performance, Cost-effective Efficiency 95~98% Charge profile measurement ~0.3mm(sigma) in avalenche mode Ideal detectors for MT MT Station using Glass RPCs Preliminary Test (203mm*203mm RPC) Sensitive to ~cm Fe/Pb Good PoCA image result
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Thank You! Speaker: Qite Li 李奇特
S. Chen, Q. Li, et al, "Simulation of a Small Muon Tomography Station System based on RPCs " Journal of Instrumentation: 10 (2014): C Qi-Te, Li, et al. "A sub-millimeter spatial resolution achieved by a large sized glass RPC." Chinese Physics C 37.1 (2013): Li, Qite, et al. "Study of spatial resolution properties of a glass RPC." NIMA:663 (2012):
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