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MEG: past present and future

MEG: past present and future. (Status and prospects). Hit map 2008. 2009. Past: february – august 2009. Intensive work on understanding instability problem on DCHs – finally found problem in HV distribution cards All chambers repaired before start of 2009 beam time: MH.

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MEG: past present and future

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  1. MEG: past present and future (Status and prospects) A.M. Baldini PSI February 17° 2010

  2. Hit map 2008 2009 Past: february – august 2009 • Intensive work on understanding instability problem on DCHs – finally found problem in HV distribution cards • All chambers repaired before start of 2009 beam time: MH A.M. Baldini PSI February 17° 2010

  3. Past: february – august 2009 • New Xe purification system in liquid phase installed with new “silent” purification pump (usable during runs): SM A.M. Baldini PSI February 17° 2010

  4. Past: february – august 2009 • Meanwhile intense work on analysis of 2008 data (being sub. To NPB) Despite sensitivity similar to MEGA FC A.M. Baldini PSI February 17° 2010

  5. Past: 2008 data analysis A.M. Baldini PSI February 17° 2010

  6. Past: 2009 run, Aug. Dec. A.M. Baldini PSI February 17° 2010

  7. Past: 2009 run, Aug. Dec. • Shortening of the beam time period  reduce beam tests and tests on individual detectors • APDs (modified for being inserted in trigger) : noise on DCHs  could not be used in data taking: FG • DRS4: long start-up procedure: ok ghost pulse removal + temperature dependence but still timing problems between different boards/chips: SR • Plus: problems with m beam settings: PRK A.M. Baldini PSI February 17° 2010

  8. Present: 2009 analysis RS, WM, CV Likelihood analysis A.M. Baldini PSI February 17° 2010

  9. Future: 2010 • Understand the reason of the bad timing measurements between different DRS boards/chips SR • Analysis improvements and better knowledge of the apparatus • Build and install chambers with new cathode foils (found some with defects: MH) • Monochromatic positron beam: Mott scattering on a calibration target AP A.M. Baldini PSI February 17° 2010

  10. Future: 2010 Asymmetric Box analysis A.M. Baldini PSI February 17° 2010

  11. Future: 201x; very preliminary 0.5*SES (e+ eff.) and 10 * bkg (2 from Pe+, 2 from timing, 2 from e+ angle) Enter in steady run conditions before proposing upgrades A.M. Baldini PSI February 17° 2010

  12. 2010 shedule A.M. Baldini PSI February 17° 2010

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