Study of the Spatial Resolution and Muon Tomographic Imaging Properties of Glass RPCs Qite Li Peking University.

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Presentation transcript:

Study of the Spatial Resolution and Muon Tomographic Imaging Properties of Glass RPCs Qite Li Peking University

Knowledge is Power Sir Francis Bacon ( )

Nuclear Knowledge can be the Power of Peace Happiness Fear Frustration

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

Muon Tomography(MT) 2.3mrad 10mrad 20mrad ~1.1° ~GeV Muon 1/cm 2 /min waterFeW 10cm

MT Station Examples Los Alamos (2003): Drift Tubes Science and Global Security 16 (2008) 37–53 INFN : CMS Muon Barrel Chambers Nucl. Inst. and Meth. A 604 (2009) FIT : Triple GEMs Nucl. Inst. and Meth. A 652 (2012) 16-20

Requirements of Detectors for MT Large Area (~1m 2 ) High Detction Efficiency (>90%) High Spatial Resolution (<1mm) Cost-effective

RPC Resistive Plate Chamber –R. Santonico(in 1980s) Large Area Good Time Solution ~1ns Acceptable Spatial Resolution –~1cm CMS Muon Trigger RPCs by PKU (2002)

-HV HV Graphite Resistive Plate Working Gas Resistive Plate Gruand Graphite Readout Strips RPC Brief View

Combination of RPC & Delay-line Readout 90% F134a+9% C 4 H 10 +1% SF 6 50ml/Min

Avalenche Signal General Properties: Signals Avalenche +Streamer Signal

General Properties: Detection Efficiency

-HV

Streamer Profile Sigma 7.4 ± 0.2mm Avalanche Profile Sigma 2.2 ± 0.1mm Simulation Profile Sigma 2.40mm

Spatial Resolution Measurement Residual Method ΔX=X 2 -(X 1 +X 3 )/2

Spatial Resolution of Glass RPCs

Uniformity -50mm~-25mm Res=0.99 mm -25mm~0mm Res=0.89 mm 0mm~25mm Res=0.82 mm 25mm~50mm Res=0.94 mm

X Y and T readout in ONE RPC

X axis 0.79 mm (FWHM) for one RPC Y axis 1.97 mm (FWHM) for one RPC Preliminary

MT Station with three 2D-Glass RPCs 12+2 channels RPC 1 RPC 2 RPC 3 Material

Imaging Result: Empty target Empty target Mean angle ~15 mrad –Position/Alignment error ~8 mrad –RPC box, framework ~10 mrad Preliminary

Imaging Result: Pb brick 1 Pb brick 1 15cm*5.5cm*3.5cm Preliminary

Imaging Result: Pb brick 2 Pb brick 2 24cm*7cm*6cm Preliminary

Conclusions Glass RPCs with LC Delay-line Readout –Simple structrue, stable performance –Efficiency 95~98% –Charge profile measurement <1mm(FWHM) in avalenche mode –Ideal detectors for MT MT Station using three 2D-Glass RPCs –Preliminary Test (detection area: 20cm*20cm) –Sensitive to ~cm Pb

MT station with 4 RPCs 3D Imaging Coming Soon

Thank You! Gmail: Supervisor: Prof. Yanlin Ye Peking University, China