1 / 5

Update on STAR AGS/RHIC Time Mtg February 18 , 2014 Bill Christie

Update on STAR AGS/RHIC Time Mtg February 18 , 2014 Bill Christie. Summary : We started looking for collisions Thursday morning (2/13/14). Determined the Global timing shift we had to make to get trigger signals into digitizer gates about 4 that afternoon.

savea
Télécharger la présentation

Update on STAR AGS/RHIC Time Mtg February 18 , 2014 Bill Christie

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Update on STAR AGS/RHIC Time Mtg February 18, 2014 Bill Christie • Summary: • We started looking for collisions Thursday morning (2/13/14). Determined the Global timing shift we had to make to get trigger signals into digitizer gates about 4 that afternoon. • Got a start on calibrating trigger counters Thursday night. • Tried continuing work on Trigger setup Friday night, but turned out that beams were mis steered at STAR, so no progress. • Beams steered into collision at STAR again about 2 pm Saturday. Found that beams were barely hitting each other with the Thursday settings. • Got second primary trigger detector calibrated by about 9 pm Sunday evening. • Started running close to a full suite of Triggers on first Fill Monday morning (after PS failure in RHIC). • Tweaking triggers today, but close to finished, and should be stable for remainder of the run. • Continuing concern about un wanted beams ending up in STAR.

  2. Some output plots from the High Level Trigger (online tracking trigger).

  3. Believe that we indications the injection into Blue Beam has issues. Fill 17696 TOF TOF TOF VPD-East TOF VPD-West

  4. PXL residual from cosmic rays Use detector half survey. Project tracks from one half to other and look at residual Align one half relative to first, looks at deviation in x,y and z. First attempts for global alignment Schematic 2 PXL halves

  5. Guess-estimate of how many “good” events we’re collecting per Fill • Very crude estimate at this point: • From a Fill this morning (17721) I estimate that there are 180, 000 “Good” events • If I assume that each fill takes 1.5 hours, and only one is missed per day, we’d get 15 Fills per day. This gives (15 Fills/day)(180 kevts/Fill) = 2.7 Mevts/day • If this is correct, and we start counting as of Midnight Sunday night, in 21 days we’d get (21 days)(2.7 Mevts/day) = ~57 Mevts. • STAR Goal for this run is 150 Mevts of “Good” collisions. I’d estimate the uncertainty in this estimate to be at least +- 50%.

More Related