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TPC tracking accuracy (by Gene):
I sampled processed data from runs 10078077-10089004 and found that the TPC shows much work to be done, but it appears accurate to say things are controlled to the 1-2mm level.

  1. GridLeak measure of gap in residuals between padrows 12 and 14 vs. z shows about a ~1mm variation over all z:
  2. Signed DCA of straight up (|eta|<0.05) tracks vs. z shows about ~2mm distortions a z beyond +/-50cm:
  3. Signed DCA of all "good" tracks has a mean of ~1mm, sigma of ~3mm:
    BTOW QA, all runs

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    ETOW QA, all runs

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