a drift chamber system for muon tomography jo pater and roger barlow applied nucleonics forum...
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![Page 1: A Drift Chamber System for muon tomography Jo Pater and Roger Barlow Applied Nucleonics Forum Teesidel March 1 st 2010 1](https://reader037.vdocument.in/reader037/viewer/2022110207/56649d605503460f94a408d5/html5/thumbnails/1.jpg)
A Drift Chamber System for muon tomography
Jo Pater and Roger BarlowApplied Nucleonics Forum
TeesidelMarch 1st 2010
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![Page 2: A Drift Chamber System for muon tomography Jo Pater and Roger Barlow Applied Nucleonics Forum Teesidel March 1 st 2010 1](https://reader037.vdocument.in/reader037/viewer/2022110207/56649d605503460f94a408d5/html5/thumbnails/2.jpg)
Smuggling of Uranium/Plutonium
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Much plutonium and weapons-grade uranium is unaccounted for. Unfriendly groups could assemble a device and transport it in a standard container lorry. Believed to be a real threat.
![Page 3: A Drift Chamber System for muon tomography Jo Pater and Roger Barlow Applied Nucleonics Forum Teesidel March 1 st 2010 1](https://reader037.vdocument.in/reader037/viewer/2022110207/56649d605503460f94a408d5/html5/thumbnails/3.jpg)
Border detection
• Radioactivity can be shielded• X ray scanning can be blocked• Detection must be rapid (few
minutes) and not damage bona fide contents (+ stowaways)
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Muon Tomography looks like (part of) the answer.Materials have high Z and large scattering power for the natural cosmic ray muons (1/cm2/min)
![Page 4: A Drift Chamber System for muon tomography Jo Pater and Roger Barlow Applied Nucleonics Forum Teesidel March 1 st 2010 1](https://reader037.vdocument.in/reader037/viewer/2022110207/56649d605503460f94a408d5/html5/thumbnails/4.jpg)
Muon chamber criteria
• Cover large area at reasonable cost• Precision ~1 mm to measure scattering angle • Ability to run for years without major
maintenance• Running in an open environment with non-
expert operators
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![Page 5: A Drift Chamber System for muon tomography Jo Pater and Roger Barlow Applied Nucleonics Forum Teesidel March 1 st 2010 1](https://reader037.vdocument.in/reader037/viewer/2022110207/56649d605503460f94a408d5/html5/thumbnails/5.jpg)
LEP and OPAL
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LEP – the Large Electron Positron machine – ran at CERN from 1989 to 2000 in the tunnel now occupied by the LHC
OPAL – one of the experiments at LEP. Measured tracks emerging from collisions from inner vertex chambers to outer muon detectors
![Page 6: A Drift Chamber System for muon tomography Jo Pater and Roger Barlow Applied Nucleonics Forum Teesidel March 1 st 2010 1](https://reader037.vdocument.in/reader037/viewer/2022110207/56649d605503460f94a408d5/html5/thumbnails/6.jpg)
OPAL muon chambers
220 chambers ~10m long by 60 cm wide
Two coordinate readout from a single wire with 1-2 mm precision
First from time taken for electrons to drift to anode wire
Second from tapered cathode pads along wire
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wire
electrons
muon
![Page 7: A Drift Chamber System for muon tomography Jo Pater and Roger Barlow Applied Nucleonics Forum Teesidel March 1 st 2010 1](https://reader037.vdocument.in/reader037/viewer/2022110207/56649d605503460f94a408d5/html5/thumbnails/7.jpg)
OPAL muon chamber criteria
• Cover large area at reasonable cost• Precision ~ mm• Ability to run for years without maintenance• Running in a controlled environment with
expert operators
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![Page 8: A Drift Chamber System for muon tomography Jo Pater and Roger Barlow Applied Nucleonics Forum Teesidel March 1 st 2010 1](https://reader037.vdocument.in/reader037/viewer/2022110207/56649d605503460f94a408d5/html5/thumbnails/8.jpg)
Adapt OPAL muon chambers for tomography
Chambers can be shorter: 2 m rather than 10 m(single pad system rather than double)Need a non-flammable gas.Take advantage of modern electronics
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![Page 9: A Drift Chamber System for muon tomography Jo Pater and Roger Barlow Applied Nucleonics Forum Teesidel March 1 st 2010 1](https://reader037.vdocument.in/reader037/viewer/2022110207/56649d605503460f94a408d5/html5/thumbnails/9.jpg)
Now being built
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Nonflammable Argon/methane mix
Chamber ready for wire stringing
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Signal pulses
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![Page 11: A Drift Chamber System for muon tomography Jo Pater and Roger Barlow Applied Nucleonics Forum Teesidel March 1 st 2010 1](https://reader037.vdocument.in/reader037/viewer/2022110207/56649d605503460f94a408d5/html5/thumbnails/11.jpg)
Conclusions
We have a drift chamber system adapted to muon tomography covering large areas with simple technology
Applicable wherever there is a need to scan a container for high Z material
If you’re interested – see http://www.hep.manchester.ac.uk/MuonTomography
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