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Run16 VPD Plan B


Common Mode Jitter found on individual QT cards

The ( tac1 - tac2 ) for channels on the same daughter card ( black points ) and channels on different daughter cards ( red points ).
This shows a clear correlation between tacs on individual daughter cards.
bbq East :
common-mode-jitter
See bbq and mxq, east and west :
bbq-east
bbq-west
mxq-east
mxq-west

Current Performance

  • Current Method : Use earliest TAC on the east and west to calculate vertex.
  • The earliest TAC method is ~25 - 35% better than using the later TACs. See : Earliest TAC method

Run14 : Average TAC method

  • Shuai and Qian showed that in Run14 using the mean TAC on east and west instead of the earliest gives improved performance. See :