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SSD Tracking Upgrade Review – Maximizing Detector Potential

Understand the significance of SSD tracking upgrade, detailing improvements in resolution and functionality, and discussions on system maintenance, manpower requirements, and cost estimates. Includes insights from prior operations and lessons learned for optimized performance.

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SSD Tracking Upgrade Review – Maximizing Detector Potential

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  1. SSD Update Howard Matis Tracking Upgrade Review – Dec. 7, 2006

  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 Tracking Upgrade Review – Dec. 7, 2006

  3. The SSD is a Beautiful Detector • 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 • The money is better spent elsewhere Tracking Upgrade Review – Dec. 7, 2006

  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 Tracking Upgrade Review – Dec. 7, 2006

  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 Tracking Upgrade Review – Dec. 7, 2006

  6. SSD has been used in STAR analysis • Needed for SVT tracking • SSD is essential for SVT analysis Tracking Upgrade Review – Dec. 7, 2006

  7. Improves the Impact Parameter Measurement cm cm cm cm analysis by Jonathan Bouchet Tracking Upgrade Review – Dec. 7, 2006

  8. 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! MISSION ACCOMPLISHED Tracking Upgrade Review – Dec. 7, 2006

  9. Situation for Upcoming Run • Ran detector on Tuesday • 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 early next year • Need beam and full detector • Manpower? Tracking Upgrade Review – Dec. 7, 2006

  10. Pedestal Noise Ladders 1 - 10 Tracking Upgrade Review – Dec. 7, 2006

  11. Pedestal Ladders 11 - 20 Noise Tracking Upgrade Review – Dec. 7, 2006

  12. 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 Tracking Upgrade Review – Dec. 7, 2006

  13. 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 ) Tracking Upgrade Review – Dec. 7, 2006

  14. 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 Tracking Upgrade Review – Dec. 7, 2006

  15. How to Upgrade for DAQ1000 • 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 • To go faster • Add more ADCs on a ladder • Increase # of RDOs • Maximum readout speed at FEE level – 10 MHz Tracking Upgrade Review – Dec. 7, 2006

  16. 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 Tracking Upgrade Review – Dec. 7, 2006

  17. Need a team to succeed • Physicists • 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) • 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) Tracking Upgrade Review – Dec. 7, 2006

  18. 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 Tracking Upgrade Review – Dec. 7, 2006

  19. 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 Tracking Upgrade Review – Dec. 7, 2006

  20. 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 Tracking Upgrade Review – Dec. 7, 2006

  21. Tracking Upgrade Review – Dec. 7, 2006

  22. Tracking Upgrade Review – Dec. 7, 2006

  23. 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 Tracking Upgrade Review – Dec. 7, 2006

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