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Message ID: 2     Entry time: Wed, 2.06.2010 14:35:46
Author: A. Laszlo 
Subject: TPC, T0, T-offset 
- Relative T0 calibration is possibble within individual TPC volumes with pulser calibration data. This was recorded for all TPC-s, except for GTPC: run 10213, 10216 (https://na61db.cern.ch:8443/elog/Run+summary/4841, https://na61db.cern.ch:8443/elog/Run+summary/4842). For GTPC, pulser connection has to be built.
- Relative calibration of TPC-s is possible with measuring the time difference between the first SCA clock edge appearing on FEE cables, on reference FEE cards. Relative T0 correction of TPC volumes:
* VTPC1, SECTOR2, PADR12, PAD1 ..32 (reference): +0ns.
* VTPC2, SECTOR2, PADR12, PAD1 ..32 : -116ns.
* MTPCL, SECTOR1, PADR6, PAD1 ..32 : -20ns.
* MTPCR, SECTOR6, PADR1, PAD1 ..32 : -22ns.
* GTPC, SECTOR1, PADR1, PAD65..96 : -118ns.
- Global calibration of TPC T0: this means only an y shift of the TPC image. Can be obtained from correlation of fitted main-vertex and BPD main-vertex.
ELOG V3.1.3-7933898