RHIC Machine Experiments Meeting - Run 21 Updates and Projections
Discussion of the latest updates on Run 21 schedule, CeC, Collider, STAR, and RHIC APEX at the RHIC Machine Experiments Meeting held on June 15, 2021. Review the progress of the ongoing experiments, data collection, and projections for achieving set goals within the current operational timeline.
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Run 21 RHIC Machine/Experiments Meeting June 15, 2021 Agenda: Discussion of remaining Run 21 schedule CeC Status/update Collider Status/update STAR Status/update RHIC APEX Update All Other Business (AOB) - W. Christie - V. Litvinenko - C. Liu - B. Llope - Y. Luo 17.3 Gev Au on Au Italics denotes slides available if needed, not planned for presentation. 1
A look at the ongoing 3.85 GeV Au Fixed target data collection Tuesday May 18th The 3.85 GeV Au fixed target physics running started on Tuesday pm, June 8th. After multiple changes to the RHIC and STAR running procedures the data accumulation rate increased from ~ 5 to ~ 7.5 M evts/DAQ hr. 3
Projection plot for 3.85 GeV Au fixed target data The goal is 1.7 B good evts Data set is being accumulated at a rate of ~ 7.5 M evts/DAQ hour. It should take about 115 DAQ hours to accumulate the remaining 863 million events to reach the data set goal. 4
Past, Present, and Future for the FY 2021 RHIC Run 17.3 The 3.85 GeV fixed target running was (re) started ~ 10 pm on Tuesday June 8th. ~ 837 M evts out of the 1.7 B evt goal have been collected so far. 5
List of components for the 2021 RHIC Run STAR Physics program 7.7 GeV Au on Au Fixed target 200 GeV O on O 17.3 GeV Au on Au 3.85 GeV (3 GeV FXT) CeC Program APEX Low Energy APEX 100 GeV APEX Other TOTAL - 13.5 weeks (Goal completed) - 1 week (Goals completed) 3.85, 44.5, 77, 100 GeV - 2 weeks ( 400 Mevt min-bias - ~2 weeks (100% complete) - 3 weeks ( start on June 8th, ~ 49% comp.) - 2 weeks (~65% expended to date*) - .66 weeks (~82% expended to date. - 70 hours If start with 45 hrs on 6/7, - 41 hours then 31 hrs to go) - ? = 24 weeks (~83% expended to date) completed, 200 Mevt central goal completed) Blue Purple Black * = Physics programs presented to the PAC, priority ordered = Has historically been a part of all RHIC runs = Beam dev. and discretionary = ~ RHIC Ops accounting = Currently running 6
Estimate of when the 3.85 GeV Fixed target running might reach its data set goal A few relevant facts: The 24 Cryo week RHIC 2021 run started on Monday January 25th and will end on Monday July 12th Counting the days from now to 8:00 am on Thursday July 8th there are 23 days to go until the end of beam operations for the 2021 RHIC run. Schedule for the coming week June 15: FXT collisions with 3.85 GeV beam and EBIS for STAR physics (1.5 hr. stores) June 16: STAR physics overnight; 15 hrs. ded. time for CeC starting at 9 am until midnight June 17: STAR physics overnight; 15 hrs. ded. time for CeC starting at 9 am until midnight June 18: STAR physics overnight; 13+1 hrs. of APEX starting at 8:30 am June 19: STAR physics overnight; 15 hrs. ded. time for CeC starting at 9 am until midnight June 20: FXT collisions with 3.85 GeV beam and EBIS for STAR physics (1.5 hr. stores) June 21: STAR physics overnight; RHIC PS work for d+Au starting at 9 am and make-up water in AGS; resume FXT collisions with 3.85 GeV beam for STAR physics Rough tally of calendar hours (from now to midnight Monday 6/21): STAR (99-14.5) = 84.5 hrs CeC = 45 hrs Subsequent week (to Monday 9 am 6/28): STAR = 79 hrs CeC = 45 hrs N.B. Ave. failure hrs ~ 15 hrs/wk APEX = 14 hrs Access = 10 hrs APEX = 14 hrs Acc/fail = 15 hrs 7
Rough Estimate of when STAR might reach the 1.7 B evt 3.85 GeV fixed target data set goal If one assumes that the tally of calendar hours for STAR running on the previous page is ~ correct, between now and 9 am on Monday June 28th STAR will have 163.5 calendar hours of running. Assuming a conversion factor of .8 to convert from calendar hours to DAQ hours this gives: (0.8 DAQ hrs/cal hrs) x 163.5 cal hrs = 130.8 DAQ hrs If one uses 7.5 M evts/DAQ hrs this gives: 130.8 DAQ hrs x 7.5 M evts/DAQ hr = 981 Mevts As STAR already has 837 M evts this estimate indicates that the fixed target data set goal should be reached by on or about Monday June 28th. 863 M evts to go. N.B. Factors that could decrease the events accumulated between now and June 28th could be: more failure hours than used in this estimate a lower conversion factor between calendar hours to DAQ hrs a lower # of evts/DAQ hr additional use of beam hours (e.g. d-Au commissioning, more CeC time, ..) ?? 8
Discussion on d-Au RHIC commissioning and running What is the scope of the RHIC commissioning effort for d-Au running: - Is re-bucketing with storage cavities needed? - Should time be spent trying to get a crossing angle between the d and Au? - Any time needed for ramping up the intensity? - How long is a store likely to last? - ?? Interleave d-Au injector and RHIC commissioning with the STAR, CeC, and APEX running: - Idea came up to possibly work in injector setup during CeC stores - When ready for RHIC setup interleave dedicated beam time for commissioning? - Plan/schedule to get the remaining commissioning down to about one day by the time the fixed target running ends? Down to 2 days? How many DAQ hrs will STAR need to achieve its data set goals? Allocation of time between CeC and d-Au running 9
All Other Business (AOB) AOB 10
Responses from STAR on some follow up questions 14.5 days x 24 hrs/day = 348 hrs 13
Input received from Yun Luo for APEX Accelerator Physics EXperiments Yun also indicated that actual time used from now to the end of the run may be a bit lower than shown (40 to 50 hrs). Slide on usual APEX beam allocation in Backup. Slight mis-match with APEX numbers I ve been tracking. Original request was for 111 hours. My accounting gives ~ 33.5 hrs remaining. I ll use 45 hrs in estimates. 14
Summary of Inputs for any time available after the STAR 3.85 GeV Fixed Target data set d-Au data set for STAR: - Rough estimate is four days of beam development to get to Physics running - STAR estimate is 36 DAQ hrs to accumulate data set - Actual goal, and time to reach goal, as submitted, is not clear (to me) - I m assuming a minimum of 5 to 6 days of running Extra Wolfram s Power Supply and other tests: - Request is up to 4 days , which I take as 4 days Extra CeC s requested additional days (3 to 5 days): Extra Already in the run plan, and running concurrently with the 3.85 GeV STAR fixed target running is 5 more days of CeC and up to 45* hrs (~ 2 days) of APEX * Number I use for coming calculations 15
