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Building and Operating a Gas Quality Measurement System for LHCb Muon

Building and Operating a Gas Quality Measurement System for LHCb Muon. Maarten van Dijk LHCb Summer Student. Men love to wonder and that is the seed of science -Emerson. Personal Information. Master project (12 sept 2009 – 05 jul 2010) @ Nikhef

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Building and Operating a Gas Quality Measurement System for LHCb Muon

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  1. Building and Operating a Gas Quality Measurement System for LHCb Muon Maarten van Dijk LHCb Summer Student Men love to wonder and that is the seed of science -Emerson

  2. Personal Information • Master project (12 sept 2009 – 05 jul 2010) @ Nikhef • Summer Student (15 jun 2010 – 10 sept 2010) @ CERN • LHCb Muon • Supervisors: • Burkhard Schmidt • Alessandro Cardini

  3. Project Description Continuous gas gain measurement for the Triple-GEM Detectors (…) This is achieved by a test chamber flushed with gas from the supply and return line of the Muon Detector, comparing the gain of the supply and return lines by means of a radioactive source. (…) It is necessary to monitor the short-term gas density and its effects on the gas gain (due to atmospheric temperature / pressure variations)

  4. GEM Detectors Working principle • Insulating foil • Copper on top and bottom • Holes in foil • Strong field in gap • Electron multiplication in holes

  5. Triple GEM chamber • Triple GEM chamber • Rack PC • High voltage supply • Ampere meter • Low voltage supply (supplies HV) • Pressure and temperature from WCS

  6. GEM data Current (nA) vs. time (s) • Current through cathode and ground • Gas from premixed bottle • Source used: Sr-90 • 40 MBq β 0.546 MeV • Gain dependent on location • GEM not uniform: to be studied

  7. Pressure corrections Local vs central pressure • Gain varies strongly with pressure • Analysis of pressure correction ongoing • Precise pressure measurement is essential

  8. To do • Implement pressure measurement adjustment into labview • Study GEM uniformity • Try to stabilize ground • Take measurements with return and supply lines

  9. That’s all folks! Thank you for listening! Questions?

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