Calibration overview

Speaker : Gene Van Buren ( BNL )

Talk time : 12:20, Duration : 00:20

Progress report on Run 10 Calibration deliveries

(see last month's Calibration readiness for Run 10, achieved resolution and incoming improvements for quantitative details on deliverables)

  • Gains into the DB earlier today
  • Status tables for 7 and 11 GeV done tomorrow
  • That's it. All calibrations will be final
  • 62, 39, and part of 7 GeV calibrated
  • 5 more weeks of AuAu7+11 data to calibrate
  • 1 week of AuAu200 data to calibrate
    • I've been unable to obtain an estimate of how long these will take to complete
  • Each of these datasets requires a notable (several M events) calibration production
  • Low energy datasets (39, 11, 7 GeV)
    • Alignment work presented by TPC calibration status
    • Timing shift (seems related to drift velocity) issues observerd in RFF data of order 1.5 mm. Not resolving for preliminary calibrations
    • Run 9 twist calibration appears sufficient as preliminary for Run 10
    • dE/dx from 39 GeV provide the current preliminary calibration, with resolution of ~7.0-7.5%, but may be off in scale by 1-2% (aging) over the whole low energy period
    • Minimal SpaceCharge + GridLeak correction in the 39 GeV data; preliminary calibration is probably good enough for final
  • High energy datasets (200, 62 GeV)
    • Generally the same issues as low energy except:
    • Preliminary SpaceCharge + GridLeak calibs are in place
      • Tests for using TOF matching to eliminate pile-up are ongoing
    • Separate alignment for FF (200 GeV), calibrating concurrently with RFF (all energies)
    • No observed timing shift in FF (200 GeV)
    • Preliminary dE/dx for 200 GeV in place
      • No preliminary dE/dx calibration for 62 GeV (maybe only final calibration will be needed if production is a low priority)
  • After final T0 and Alignment (many weeks from now), will probably need to re-calibrate (at least re-evaluate):
    • Twist
    • SpaceCharge + GridLeak
    • dE/dx
  • Status tables for BEMC (used by vertex-finders for matching tracks) are preliminary only
  • Run 9 gains serve as preliminary for Run 10
    • Needs checked with a large data sample (~5M events?) once TPC is calibrated
      • Likely use whatever sample TOF uses for their final calibrations
    • Need a volunteer to take this task
  • All preliminary calibrations are in place.
  • Awaiting final calibrated TPC for final TOF calibrations.