Arnd Meyer (RWTH Aachen) July 21, 2003Page 1 Data Taking July 14 – 20 Day∫L dt (del)∫L dt (rec)Efficiency Mon 956nb -1 840nb -1 87.8% Wed 111nb -1 100nb.

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Presentation transcript:

Arnd Meyer (RWTH Aachen) July 21, 2003Page 1 Data Taking July 14 – 20 Day∫L dt (del)∫L dt (rec)Efficiency Mon 956nb nb % Wed 111nb nb % Thu 481nb nb % Fri 633nb nb % Sat 1014nb nb % Sun 1250nb nb % This week4445nb nb % Last week7807nb nb % Best week9786nb nb % Fairly consistent data taking efficiency More than usual interruptions keep average still below 90%

Arnd Meyer (RWTH Aachen) July 21, 2003Page 2 Integrated Luminosity Could/should surpass 200pb -1 by shutdown (need ~5pb -1 /week) Detector complete

Arnd Meyer (RWTH Aachen) July 21, 2003Page 3 Data Taking Efficiency Detector complete May/JuneJuly

Arnd Meyer (RWTH Aachen) July 21, 2003Page 4 Highlights / Lowlights ● Calorimeter low voltage power supply trips Around 140 (!) trips between Wed Jul 9 and Tue Jul 15 Two problems, one with power supply, one with rack monitoring Ultimately solved during access on Tuesday Jul 15 Need to study impact of trips on data quality (at 50Hz to tape there may be strange events while voltages are coming down) ● Different low voltage power supply trip on Saturday Investigated today, will require longer access to repair (OK for now) ● A couple of cases where Level 3 nodes or single board computers in readout crates would fail Improved monitoring, software, instructions ● Muon front-end and HV problems over the weekend Central: PDT HV trip, affecting 4 chambers. Identified and disabled during access today Forward: MDT front-end board causing frequent readout and trigger errors, ~once/hour. Replaced during access today

Arnd Meyer (RWTH Aachen) July 21, 2003Page 5 Highlights cont. ● Other minor access work on Muon electronics, L1 Muon, L1 Track Trigger, Forward Proton Detector, during 3 controlled accesses ● New trigger list online since Thursday morning Reduced some monitor trigger rates, decoupled some L1/L2 triggers, L3 changes for B triggers Fairly large number of (mostly minor) issues, aggravated by new shifters, operator errors, vacation time,... Continue to work hard on getting back to 90%+ efficiency