2017-12-05-physics-shifter » History » Revision 5

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Rogers, Chris, 08 December 2017 13:00


2017-11-30 physics-shifter

Start Date: 2017-12-05
End Date:
Start Run: 10432
End Run:
Physics shifter: Chris Rogers


The aim was to get the empty data for corresponding LiH full settings:

  • 5th December - possibly recover magnets following a quench
  • 6th December - 2016-05.1 setting (flip mode, 140 MeV/c)
  • 7th December - 2017-02-7 setting (flip mode, 140 MeV/c)
  • 8th December - 2017-02-8 setting (flip mode, 170 MeV/c)

Elog, CDB

Online reco


5th December

No data

6th December

  • TOF1 dt is 50 ps, still not great; TOF0 and TOF2 slab conversion to space point efficiency ~ 97-98 %
  • TKU, TKD has no obvious dead area
  • Amplitude change looks okay. Notice more scraping than with M2D data sets.
  • I spend some time staring at the chi2 plots in TKD. TKD has a longer tail, but I think it is not significant. Comparing e.g. chi2/ndf = 4, with the peak chi2, the ratio is < 10^-3 for both TKU and TKD. But TKD has a longish tail beyond - all at < 10^-3 level, so did not dig further. I also note TKD has fewer ndf, potentially indicating less successful track finding from PR; again, something to dig into (but data is probably okay).
  • I noted onrec shows lots of electrons in EMR for the diff8 setting. Why is that?

Updated by Rogers, Chris over 6 years ago · 5 revisions