Page History

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1. Production status
   • pilot production has been QAed . No major problems were found and Lidia is most likely executing production now.
   • expect St-W muDst to be ready in few days.
2. ETOW absolute calibration to compensate for incorrect TCD phase used during data taking. Two alternative methods are used:
   • Justin is comparing ratio of slopes for correct & incorrect TCD phase from pp200 data: http://drupal.star.bnl.gov/STAR/blog/stevens4/2009/aug/05/run-9-eemc-tcd-phase-and-effective-gains
     Fig 1.1 show example for 1 tower
     Link http://drupal.star.bnl.gov/STAR/system/files/ETOW_SlopeSet0vSet1234.pdf
     shows slopes (top) and the deduced gain correction (bottom) for all towers and all crates.
   • Scott is analyzing slopes from pp500 data taken and various TCD phases and predicts similar gain correction for the TCD phase value used during W-data taking.
     The comparison is here

     PDF
     name scott-08-20-2009-all_ETOW-crates.pdf

     In particular pages 4-6 show error bars. Both methods lead to the same gain correction.
   • The plan is to compute weighted average gain correction and upload it to DB with a different flavor. So user will get non-sense gains for the default 'ofl' and needs to request those. (Very good plan, Jan)
3. Status of Vernier scan was presented by Ross: http://drupal.star.bnl.gov/STAR/blog/rcorliss/2009/aug/20/absolute-cross-section-notes-5^{Image Added}
   The rate of STAR events vs. time is described by the product of 2D gauss functions representing spread of ions in both beams. We know relative displacement of both beams for every time period from Angelika. Ross fits 2 params: sigX, sigY - the width of gauss.
   Fig 3 ('counts vs. steps') shows anticipated result. The value of 'skfNN' is absolute cross section of STAR BHT3 trigger in units TBD and assuming no hot tower correction is needed.
   Ross add constant background to better describe rate , yet still peaks are under-predicted.
   He will continue to try to model vernier scan better and is awaiting for muDst from 6 runs from ongoing production to be able to assess how stable is value of skfNN.
4. run QA : Hal will do QA of the first week of pp500 data within next 30 days, backward in time.

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July 16

1. Joe/Gene - spacecharge and gridleak - Having had Gene diagnose that there were issues with the gridleak in the current calibration I went back with his estimated numbers and re-ran it, but there may be problems with that now and it may take another iteration or two to find our way to the correct place to be.
2. Hal - QA - Didn't call in, but he said at the analysis meeting that he would do more QA (the rest of it).
3. Rosi/Jan - PPV - Rosi was working on the beam tilt part of it now and it sounds like she is getting good results and everything so it won't hold us up once we get the sc/gl ready.
4. Willie - BSMD - Showed his progress (see the email he sent around)
5. Ross - Vernier - See his drupal page
6. Scott - ETOW gains - See his presentation. He started looking at the gains in each sector now with the data from the timing scans, but using "Scott's method" for calculating the gain (last slide). It looks like sectors 5 and 6 are actually different from 3 and 4 when you use "Scott's method". He thinks he will have a gain for each tower calculated by the end of next week though. So excellent progress there.

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