study of the spatial resolution and muon tomographic imaging properties of glass rpcs
DESCRIPTION
Study of the Spatial Resolution and Muon Tomographic Imaging Properties of Glass RPCs. Qite Li Peking University. Knowledge is Power Sir Francis Bacon (1561-1626). Peace Happiness. Fear Frustration. Nuclear Knowledge can be the Power of. U ranium 90% (HEU) Pu-239 93% (WGPu) - PowerPoint PPT PresentationTRANSCRIPT
Study of the Spatial Resolution and Muon Tomographic Imaging Properties of
Glass RPCs
Qite Li
Peking University
Knowledge is PowerSir 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
Muon Tomography(MT)
2.3mrad 10mrad 20mrad ~1.1°
~GeV Muon 1/cm2/min
water Fe W10cm
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) 738-746.
FIT : Triple GEMs
Nucl. Inst. and Meth. A 652 (2012) 16-20
Requirements of Detectors for MT
• Large Area (~1m2)• 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 (200
2)
-HV
HV Graphite
Resistive Plate
Working Gas
Resistive Plate
Gruand GraphiteReadout Strips
RPC Brief View
Combination of RPC & Delay-line Readout
90% F134a+9% C4H10+1% SF6
50ml/Min
• Avalenche Signal
General Properties: Signals
• Avalenche +Streamer Signal
General Properties: Detection Efficiency
-HV
Streamer ProfileSigma 7.4±0.2mm
Avalanche ProfileSigma 2.2±0.1mm
Simulation ProfileSigma 2.40mm
Spatial Resolution Measurement
• Residual Method
• ΔX=X2-(X1+X3)/2
Spatial Resolution of Glass RPCs
mmFWHM
mmmm
XXXf
xx
x
xxxx
90.035.2
384.0470.0816.03
2
2
3)2
1()
2
1(
2/)(
223
221
222
2
312
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
Preliminary
MT Station with three 2D-Glass RPCs12+2 channels
1P
2P
RPC 1
RPC 2
RPC 33P
Material
Imaging Result: Empty target
• Empty target
• Mean angle ~15 mrad– Position/Alignment err
or • ~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 ImagingComing Soon
Thank You!
Email: [email protected] Gmail: [email protected]
Supervisor: Prof. Yanlin YeEmail: [email protected]
Peking University, China