Calibration

Under:

MTD Calibration

Calibration Parameters

  • Trigger Time Windows -- limit the MTD hits to those that are within a certain window w.r.t. the central TOF clock
  • INL -- apply the Integral Non-Linearity electronics calibration (specific to the HPTDC chips) 
  • T0 -- align the timing of all the MTD channels
  • Slewing -- calibration for amplitude (time-over-threshold) depended timing effects
  • Alignment -- correct MTD/TPC alignment, using the residuals between matched TPC track and MTD hit pairs

Procedure

A schematic workflow is shown here, and a detailed description can be found in Calibration Workflow. Details about the calibration procedure can be found here



Parameter Storage

  • The calibration parameters are stored in the data base
  • These parameters can also be found here


Calibration Parameters

Run19 (BES II)

Run18 (200 GeV Isobar, 27 GeV Au+Au)

Run17 (500 GeV p+p, 54 GeV Au+Au)


Run16 (200 GeV Au+Au, 20-200 GeV d+Au)

Run15 (200 GeV p+p, p+Au)

Run14 (200 GeV Au+Au)

  • Determine timing window for cosmic ray data: slides
  • Determine timing window for real data: slides
  • Compare mean and sigma of dT distributions between data and cosmic ray: mean, sigma

Run13 (510 GeV p+p)

  • Determine timing window for cosmic ray: slides
  • Determine timing window for real data: 130-149, 151-161
  • Check timing window vs. day: slides
  • Compare mean and sigma of dT distributions between data and cosmic ray: mean, sigma