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2016 Request for cosmics with magnet ON
Updated on Mon, 2016-03-21 11:14. Originally created by genevb on 2016-03-21 11:09.
TPC:
-Gene
- GMT trigger and reconstruction software are working well
- Preference is to have ~5-10k tracks per module at each polarity of magnetic-field-on to have pT-dependence of TPC track residuals with GMT hits (distinguishing different effects requires looking at pT-dependence)
- pT-independent examination requires ~1k tracks per module (essentially assumes all effects seen are alignment)
- Endcap GMT modules see ~50% statistics of central GMT modules (simply acceptance), so they determine the statistics needed
- Taking cosmics with the TPC Gating Grid in an always-open state has been found to produce significant distrotions induced by ions flowing back into the TPC from the anodes
- Using statistics of runs taken in January 2016, we get ~500 tracks in the least populated GMT module per day
- We made a You do not have access to view this node that put the estimate at ~1k tracks per module per day not accounting for 50% acceptance at endcaps: these numbers match!
- So far, we have accumulated ~9 days integrated of RFF comics, and it is likely that we'll get a bit more RFF during other down days through the rest of Run 16
- Initial conclusion: we will likely reach the minimum goals for TPC-GMT data for RFF by the end of Run 16 without taking any RFF data during the ~two week down time
- Options for cosmics during the ~two week down time:
- Zero field: not significantly helpful in studying TPC distortions
- RFF: could double the statistics by running ~10 days
- FF: could reach the minimum statistics by running ~10 days <== This is the TPC group's preference
-Gene
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