J.Slanker, D. Dickey, K. Dehmelt, M. Hohlmann, L. Caraway

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Presentation transcript:

High Energy Particle Detection through prototype Gas Electron Multiplier Systems J.Slanker, D. Dickey, K. Dehmelt, M. Hohlmann, L. Caraway Florida Institute of Technology Department of Physics and Space Sciences March 18, 2005

What Is a Gas Electron Multiplier (GEM)? Applications: -particle tracking at accelerators -X-ray imaging for space-based high-energy astrophysics -applications/designs for Homeland Security -aging of substances -medical imaging L. Caraway

The GEM Our purpose to serve as a detector for high energy ionizing particles (usually gamma rays), and to image the substances that emit the radiation.

How It Works - Incident ionizing particle -ArC02 (70% Ar, 30% CO2) mixture -Photoelectric Effect and Compton Scattering -relectons are accelerated towards the induction plane -large electric potentials created by the GEM foils around 300V to 500V. -“cascade” -gain Close-up of GEM foil Example of a triple GEM. F.Sauli F.Sauli

GEM Foils 3M Worldwide Copper coated Kapton foil 1-inch effective area L.Caraway

System Voltage Source for HV board HV board provides voltage for GEM foils. Radioactive Source provides impetus for cascade. Output signal amplified by linear amplifier. Signal interpreted by oscilloscope or Labview programs.

Results of Experimentation Results for experimentation proved inconclusive. Signal seen from triple GEM may have incorporated the desired signal. Results seen from Single GEM detector

Problems To Overcome Problems with the triple GEM: -Sparking inside GEM, most likely due to humidity. -Keeping out out-gassing substances/substances which interfere with operationas well as unwanted electromagnetic interference. -Keeping GEM foils clean.

Subsequent The 10x10 GEM Plans are currently being made for the next generation of GEM using a “10x10 triple GEM” to accomplish what we set out to do in the first two GEM detectors. F. Sauli

Conclusion The GEM Use What was done Outcome of trials

Acknowledgements Outgassing Information: http://outgassing.nasa.gov/ Good sources for GEM information: http://chall.ifj.edu.pl/~lesiak/detectors_yr02.pdf http://www-hep.uta.edu/hep_notes/lc/lc_0001.pdf http://www-flc.desy.de/thesis/diplom.2004.voigt.pdf GEM Graphics: (in order of appearance) L. Caraway F. Sauli K. Dehmelt http://gdd.web.cern.ch/ GDD/using.htm Special Thanks to: Georgia Karagiorgi