Development of GEM Detectors for Muon Tomography

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Presentation transcript:

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

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 A386 531, 1997. (2) http://cerncourier.com/cws/article/cern/27921

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

Our Detector HV circuit Readout Amplifier Oscilloscope

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

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)

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

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

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

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)

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

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