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,

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Presentation transcript:

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

Knowledge is Power Sir Francis Bacon (1561-1626)

Nuclear Knowledge can be the Power of Peace Happiness Fear Frustration

Uranium 90% (HEU) Pu-239 93% (WGPu) 26 kg HEU / 5kg WGPu 11 cm / 6 cm box

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

Requirements of Detectors for MT Large Area (~1m2) High Detction Efficiency (>90%) High Spatial Resolution (~1mm) Cost-effective Peking University

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) 738-746. FIT : Triple GEMs Nucl. Inst. and Meth. A 652 (2012) 16-20 Science and Global Security 16 (2008) 37–53 ~1000 electronic channels

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

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)

Combination of RPC & Delay-line Readout 90% R134a+9% C4H10+1% SF6 50ml/Min

Induced Charge Profile Measurement

General Properties: Signals Avalenche Signal Avalenche +Streamer Signal

General Properties: Detection Efficiency

Induced Charge Profile Measurement

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

Spatial Resolution Measurement Residual Method ΔX=X2-(X1+X3)/2

Spatial Resolution of Glass RPCs

MT Station with three 2D-Glass RPCs (2012) 12+2 channels Material

PKU some 3*3*3cm3 Fe blocks

Preliminary 3D Imaging Result (2013~2014) RPC 1 203mm*203mm RPC 2 203mm*203mm RPC 3 203mm*203mm RPC 4 203mm*203mm Material

Pb & Fe cubes (data of 4 days, PoCA imaging) x z Preliminary Preliminary Preliminary

Pb or Wood in Fe cube Preliminary Preliminary Preliminary Preliminary

Very good agreement with GEANT4 Simulation x z y x z Preliminary Preliminary Preliminary Preliminary Preliminary Preliminary

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)

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

Thank You! Speaker: Qite Li 李奇特 Email: Liqt@pku.edu.cn S. Chen, Q. Li, et al, "Simulation of a Small Muon Tomography Station System based on RPCs " Journal of Instrumentation: 10 (2014): C10022. Qi-Te, Li, et al. "A sub-millimeter spatial resolution achieved by a large sized glass RPC." Chinese Physics C 37.1 (2013): 016002. Li, Qite, et al. "Study of spatial resolution properties of a glass RPC." NIMA:663 (2012): 22-25.