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Development of GEM Detectors for Muon Tomography

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Presentation on theme: "Development of GEM Detectors for Muon Tomography"— Presentation transcript:

1 Development of GEM Detectors for Muon Tomography
N. Leioatts, T. Garlick, A. Moss, A. Quintero, M. Hohlmann Department of Physics and Space Sciences Florida Institute of Technology

2 Gas Electron Multiplier (GEM)
Particle detector technique (1). Constructed of Kapton foil clad in copper on both sides, with holes through layers (1). Voltage applied High electric field in holes Avalanche of ions and e- e- collected (2). (1) Sauli, F.; NIM A , 1997. (2)

3 Our GEM Triple GEM Limit to Gain per foil (sparking) 4 foils made Planned Use: Homeland Security (Muon Tomography for detection of nuclear contraband. J. Helsby, et al. FAS 2008) 70:30 Ar:CO2 55Fe Source for testing Emits monoenergetic 5.9 KeV X-ray

4 Our Detector HV circuit Readout Amplifier Oscilloscope

5 Construction Arrive Stretched Mounted Cut Assembled
On Machined G10 Frames Mounted With Stycast Cut Assembled On lid of detector

6 Then It Works!! Not so much Large leakage current
Peak occurs much lower than GEM operating voltage (3) (3) F. Murtas. LNF-INFN. Frascati (2002)

7 Areas that Needed Improvement
GEMs Sparking Box Pressure Gluing Larger Clamps Amplifier Readout

8 Improvements Gas Leakage Amplifiers Sturdier Steel Frames 8” C-clamps
Stycast Soldered connector pins Amplifiers Characterized differential to single side amplification Amplifier B, Tested with a Square input

9 Electric Field Testing
Linear Output from HV circuit Operating Voltage: Vin ~ 9V Produces 300V across a single foil

10 Individual Testing Motivation: High leakage current between foils
Systematic testing of each foil (4) Current drops with time As in a capacitor Foil I shows a larger leakage current than Foils III and IV (4) Barbeau, P.S. et al. NIM A 515 (2003)

11 Conclusions Solved physical (gas) leakage problems
Still has electrical (current) leakage problems Currently working on this

12 Future Continue individual testing until all foils are satisfactorily characterized Reinstall Detector and continue to troubleshoot problems until detector works satisfactorily Move to the construction of a larger detector

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