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Trickle Background Investigation

Trickle Background Investigation. SVTRAD sees large dose from LER Trigger counts often don’t correlate LER injection backgrounds worse after March 7 Analyze injection sampling triggers to see BaBar readout Compare date from late Run5 and Run6. SVT Integrated Dose per LER Injection

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Trickle Background Investigation

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  1. Trickle Background Investigation • SVTRAD sees large dose from LER • Trigger counts often don’t correlate • LER injection backgrounds worse after March 7 • Analyze injection sampling triggers to see BaBar readout • Compare date from late Run5 and Run6

  2. SVT Integrated Dose per LER Injection ( BEMid, BETop, BEBot ) Run5 Run6

  3. SVT Integrated Dose per HER Injection ( BWMid, BWTop, BWBot ) Run5 Run6

  4. Integrated Triggers per LER Injection [# of revolutions which generate background] ( EMC, DCH ) Run5 Run6

  5. Integrated Triggers per HER Injection [# of revolutions which generate background] ( EMC, DCH ) Run5 Run6

  6. BaBar Readout • Each injection BaBar samples the detector at a couple different revolutions of the injected bunch. • The particular revolutions which are sampled is scanned over many injections. • We can reconstruct a picture of the average background per injection for each revolution of the injected bunch. • Currently, this scan is done over the first 525 revolutions.

  7. LER Injection - SVT Readout Aug 6, 2006 Apr 1, 2007 short-term bkg No long term bkg

  8. LER Injection - SVT Readout Aug 6, 2006 Apr 1, 2007

  9. LER Injection - EMC Readout Aug 6, 2006 Apr 1, 2007 Pre-amp saturation effect

  10. LER Injection - EMC Readout Aug 6, 2006 Apr 1, 2007

  11. LER Injection - DRC Readout Aug 6, 2006 Apr 1, 2007 DRC is sensitive to this long-term bkg. SVTRAD may see this as well.

  12. LER Injection - DRC Readout Aug 6, 2006 Apr 1, 2007

  13. Observations • SVTRAD/trigger LER injection monitoring indicates large dose over a small period. • BaBar readout confirms that the detector is getting more exposure in first ~15 revolutions. • EMC is suffering saturation effects for ~250 usec after LER injection • DRC sees late activity (>100 revolutions) in LER backgrounds as well – may be visible to SVTRAD diodes but not the trigger system. • HER injection is generally worse as well, but not as big a difference from Run5.

  14. Extra Slides

  15. LER Injection - DCH Readout Aug 6, 2006 Apr 1, 2007

  16. LER Injection - DCH Readout Aug 6, 2006 Apr 1, 2007

  17. HER Injection - SVT Readout Aug 6, 2006 Apr 1, 2007

  18. HER Injection - EMC Readout Aug 6, 2006 Apr 1, 2007

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