Transcript SSD software and hardware maintainability Howard Matis H. Matis
SSD software and hardware maintainability
Howard Matis H. Matis STAR Inner Silicon Tracking Detector Review – July 8, 2006 1
Boundary conditions of this talk
• Very casual observer – Not that familiar with current situation – (was on review committee that approved SSD) • Can get good physics from it now • SSD is essential to the operation of HFT • Record low noise 2006 – 3 ADC counts – Detector works • SSD
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delenda est H. Matis STAR Inner Silicon Tracking Detector Review – July 8, 2006 2
Situation this run
• System hung after taking a minute or so of triggers • Traced to Level 2 aborts • Taken out of run until end – experts fixed the problem • L2 problem significantly improved but still high aborts – mostly pp problem • Smoke problems at end of run - not sure if SSD related – No in situ diagnosis – Decisions from remote • Data taken and being analyzed H. Matis STAR Inner Silicon Tracking Detector Review – July 8, 2006 3
Lessons learned
• Detector must be tested with full system before each run • Experts must be available to assist ASAP – Come to BNL if necessary • Testing slots are limited – Schedule access is not fixed – “Scheduled” accesses should stick to the schedule • SSD must have a “mother” at BNL making sure detector is in the run H. Matis STAR Inner Silicon Tracking Detector Review – July 8, 2006 4
Runtime hardware support
• Requires less effort than the TPC or EMC • Needs person at BNL watching SSD – Advocating and assuring for its inclusion in the run – Basic knowledge of system – Answer simple questions from shift crews • At least two people who can provide – Backup – Advise – Help in access (need fixed access times from RHIC) • Real expert who can consult • FPGA Programming support – Should only need this help during shutdowns H. Matis STAR Inner Silicon Tracking Detector Review – July 8, 2006 5
Shutdown hardware support
• Fix known problems • Tend to routine maintenance • Assist if changes needed to SVT cone area • Routine work on infrastructure • People – Team of physicists to work on the detector – Electrical and hardware techs to do infrastructure maintenance H. Matis STAR Inner Silicon Tracking Detector Review – July 8, 2006 6
Maintenance needed now
† † Jerome Baudot • Solve the problem with one of our LV power supply boards (ladder 5) • Check all cooling pipes • If the readout box of the SVT are removed, we need to find something to fix the SSD RDO • Understand why during the few days we did take data, some ladders had HV trips (cooling problem?) • One ladder side (7P) is silent – Fix ADC Board – Might need to replace it • Check optical fibers – Need specialized equipment. At BNL?
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Software support
• One person doing daily calibration and checks of the performance • Software detector leader who responsible for making sure SSD is ready when production starts • People who need SSD for their physics analysis H. Matis STAR Inner Silicon Tracking Detector Review – July 8, 2006 8
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Need a team to succeed
• Subsystem leader (1/4 time) • Software coordinator (1/2 time) • Calibration and detector expert (1/2 time and @ BNL) • Subsystem Expert (need at least 2 @ 1/4 time) • Slow controls (1/8 time) • People who want to use it for physics • French Support (need shops and some travel to BNL) • Mechanical and electrical tech support (several weeks during shutdowns) • Electrical Engineer (when problems occur) H. Matis STAR Inner Silicon Tracking Detector Review – July 8, 2006 11
Summary
• SSD provides valuable tracking for current detector and the HFT • “Low” maintenance calibration • Should be supported by STAR • STAR must provide sufficient manpower for it to succeed H. Matis STAR Inner Silicon Tracking Detector Review – July 8, 2006 12