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SSD Update

SSD Update. Howard Matis. Outline. What is the SSD? Why we need it? Some tracking results Current Status How to upgrade? Manpower needed to run the detector at its potential. The SSD exists!!. The SSD is thin 1% radiation length - double sided Si The SSD lies at an ideal radius

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SSD Update

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  1. SSD Update Howard Matis Review of the STAR Tracking Upgrade Plan - 1/07

  2. Outline • What is the SSD? • Why we need it? • Some tracking results • Current Status • How to upgrade? • Manpower needed to run the detector at its potential Review of the STAR Tracking Upgrade Plan - 1/07

  3. The SSD exists!! • The SSD is thin • 1% radiation length - double sided Si • The SSD lies at an ideal radius • 23 cm - midway between IP and IFC • The SSD has excellent resolution • The SSD is too large to be replaced • More economical to build other detectors Review of the STAR Tracking Upgrade Plan - 1/07

  4. ~ 60 cm Two Layers of Tracking • 95 mm  4.2 cm strips • 300 mm thick • Double sided • Crossed at 35 mrad • 20 ladders • 67 cm long • Air cooled •  < 1.2 Review of the STAR Tracking Upgrade Plan - 1/07

  5. ~ 1 m SSD Facilitates Tracking from the TPC to IST • xy = 30 µm • z = 700 µm • TPC pointing resolution at the SSD is ~ 1 mm • SSD pointing at the IST is ~ 300 mm Inside the IFC Review of the STAR Tracking Upgrade Plan - 1/07

  6. SSD has been used in STAR analysis • Needed for SVT tracking • SSD is essential for SVT analysis Review of the STAR Tracking Upgrade Plan - 1/07

  7. Data - Cu + Cu 62 GeV – Impact Parameter TPC TPC +SSD +SSD +SVT1,2,3 +SVT1,2,3 1/p 1/p • Resolution here includes vertex and hit resolutions. Real values 20% smaller. • Huge difference in pointing between SVT and everything else • At infinite momentum limit is ~150 µm in XY and 80 µm in Z (~vertex resolution) • At 1 GeV/c, it is 220 µm in xy and 150 µm in z • z is our good (not shifting) coordinate! Review of the STAR Tracking Upgrade Plan - 1/07

  8. Situation for Upcoming Run • Ran detector in December • System ran and stable • Obtained pedestals and noise • 70% of the detector good for physics - NOW • Should be able to recover rest to 95% • L2 aborts acceptable for rate <30 Hz • SSD not useful for p-p running • Jerome Baudot will visit BNL and instruct new people when ready to run • Need beam and full detector Review of the STAR Tracking Upgrade Plan - 1/07

  9. SSD level - 4 Readout Boards (RB) located on the TPC wheels - Each RB interfaces 10 ladders with trigger / daq / slowcontrol - Readout speed : 30 MHz SSD Electronics and the Future Module level - 768 strips per side ( P and N side ) - Analog signal of 1.5 s - 50 mV/MIP - Readout speed : 3 MHz Ladder level - 2 Connexion boards ( 1 per side ) - 2 ADC boards ( 1 per side ) Review of the STAR Tracking Upgrade Plan - 1/07

  10. Current Readout Speed • Front end Digitization • FEE runs at 3 MHz • 96 chips/ladder side with 128 channels/chip • 4.1 ms to digitize a ladder side • Transfer to DAQ via RDO • Readout at 30 MHz • 1 RDO/10 ladder sides • 4.1 ms for readout • 3 ms for 0’s to match TPC DAQ format • 7 ms total RDO Board Review of the STAR Tracking Upgrade Plan - 1/07

  11. How to Upgrade • For 1.2 ms readout time • Digitize at 10 MHz • Have a RDO for 3 ladder sides - 3 • No zeros to fill the ASICS – 2 • Opportunity to upgrade firmware • Solve L2 abort problem • Estimated cost (mostly to produce new RDOs ) : ~100 k$ • Must verify power distribution and cooling • Need to test concept Review of the STAR Tracking Upgrade Plan - 1/07

  12. Lessons Learned from STAR Operations • Detector must be tested with full system before each run at BNL • Experts must be available to assist ASAP • Come to BNL if necessary • Train shift crews • 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 being used • Must be regular maintenance of the detector Review of the STAR Tracking Upgrade Plan - 1/07

  13. Need a team to succeed • Physicists • Subsystem leader (1/4 time) • Software coordinator (1/2 time) • Calibration and detector expert (1/2 time and resident @ BNL) • Subsystem Expert (need at least 2 @ 1/4 time) • Slow controls (1/8 time) • Advice from present experts • People who want to use it for physics • Engineers • French Support (need shops and some travel to BNL) • Mechanical and electrical tech support (several weeks during shutdowns) • Electrical Engineer (when problems occur) Review of the STAR Tracking Upgrade Plan - 1/07

  14. Summary • SSD provides valuable tracking for current detector and the Inner Tracker • “Low” maintenance calibration • Should be supported by STAR • Can be maintained • Should work for this Au-Au run • STAR must provide sufficient manpower for the SSD to succeed Review of the STAR Tracking Upgrade Plan - 1/07

  15. The End Review of the STAR Tracking Upgrade Plan - 1/07

  16. Backup Review of the STAR Tracking Upgrade Plan - 1/07

  17. Pedestal Noise Ladders 1 - 10 Review of the STAR Tracking Upgrade Plan - 1/07

  18. Pedestal Ladders 11 - 20 Noise Review of the STAR Tracking Upgrade Plan - 1/07

  19. Maintenance Needed Next Summer Shutdown • Solve the problem with one of the LV power supply boards (ladder 5) • Check all cooling pipes. Understand HV trips (cooling problem?) • Solved if SVT removed • One ladder side (7P) is silent • Fix ADC Board • Might need to replace ladder • Check optical fibers • Need specialized equipment. At BNL? • Fix L2 abort problem • Need 1 month of a SSD Engineer and Tonko Review of the STAR Tracking Upgrade Plan - 1/07

  20. 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 Review of the STAR Tracking Upgrade Plan - 1/07

  21. 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 Review of the STAR Tracking Upgrade Plan - 1/07

  22. Software support • One person doing daily calibration and checks of the performance • Jerome Lauret requires a software detector leader • responsible for making sure SSD is ready when production starts • People who need SSD for their physics analysis Review of the STAR Tracking Upgrade Plan - 1/07

  23. Review of the STAR Tracking Upgrade Plan - 1/07

  24. Review of the STAR Tracking Upgrade Plan - 1/07

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