Timing calibration for 62 GeV Run (Run5)

This page shows timing calibration summary of TOF for 62 GeV at run5 Cu+Cu collisions.
Calibrated runlist is here. (199 run)
(Run5 Cu+Cu 62GeV have 202 runs include zero field runs. Zero field run number is 162365, 162367 and 162753.)
Using file type : CNT nDST (pro71)
These files are calibration parameter.
You can use these parameters by MasterRecalibrator.
Global timing offset is -8.3 (ns).
Slat by slat offset is here.
Run by run offset is here. (runnumber, mean, mean-err, sigma, sigma-err)

1. Global timing offset

Global timing offset is applied to adjust mass square centroid.
Figure 1 shows TOF performance plot after global timing correction.
All runs are estimated about -8.3 ns by.


Figure 1
mass square distribution before calibration.

2. Slat by slat timing offset

After global timing offset, we need to correct timing distribution for each slat.
Since almost slat is corrected only global timing correction,
slat dependence of timing correction is small (20 - 100 ps) for most of slat.



Figure 2.1
timing vs slatid after global timing correction. timing for almost slat is around 0. The left figure show before, the right show after calibration.

3. Run by run timing offset

Timing distribution could be affetcted for some reasons run by run,
so we should correct these small shift of timing distribution.
Run by run timing calibration by using high momentum pion. (1.0 < mom < 1.7)
Figure 3.1
Run by run timing calibration by using high momentum pion (1.0 < mom < 1.7 GeV/c)
(left) Momentum Vs Timing (before)
(right) Momentum Vs Timing (after)

Figure 3.2
Run by run timing calibration by using high momentum pion (1.0 < mom < 1.7 GeV/c)
(left) run number vs mean and sigma (before)
(right) run number vs mean and sigma (after)


Figure 3.3
Momentum Vs Resolution

4. Result


Finally, we achieve 126.8 ps timing resolution for 62 GeV run.

Figure 4
Mass square after calibration and projection to horizontal axis. (1.0 < mom < 1.3 GeV/c)
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last updated on Monday, 01-May-2006 00:57:59 EDT by Kentaro Miki