SSD Update Howard Matis H Matis Tracking Upgrade

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

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 H. Matis Tracking Upgrade Review – Dec. 7, 2006 2

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 H. Matis Tracking Upgrade Review – Dec. 7, 2006 3

Two Layers of Tracking § 95 m 4. 2 cm strips 300 m thick Double sided Crossed at 35 mrad ~ 60 cm § 20 ladders 67 cm long Air cooled § < 1. 2 H. Matis Tracking Upgrade Review – Dec. 7, 2006 4

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 m H. Matis Inside the IFC Tracking Upgrade Review – Dec. 7, 2006 ~1 m 5

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

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

Data - Cu + Cu 62 Ge. V – Impact Parameter TPC +SSD +SVT 1, 2, 3 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 Ge. V/c, it is 220 µm in xy and 150 µm in z • z is our good (not shifting) coordinate! • MISSION ACCOMPLISHED H. Matis Tracking Upgrade Review – Dec. 7, 2006 8

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% § L 2 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? H. Matis Tracking Upgrade Review – Dec. 7, 2006 9

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

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

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 (7 P) is silent Fix ADC Board Might need to replace ladder § Check optical fibers Need specialized equipment. At BNL? § Fix L 2 abort problem Need 1 month of a SSD Engineer and Tonko H. Matis Tracking Upgrade Review – Dec. 7, 2006 12

SSD Electronics and the Future SSD level Module level - 4 Readout Boards (RB) located on the TPC wheels - Each RB interfaces 10 ladders with trigger / daq / slowcontrol - Readout speed : 30 MHz - 768 strips per side ( P and N side ) - Analog signal of 1. 5 s - 50 m. V/MIP - Readout speed : 3 MHz Ladder level - 2 Connexion boards ( 1 per side ) - 2 ADC boards ( 1 per side ) H. Matis Tracking Upgrade Review – Dec. 7, 2006 13

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 H. Matis Tracking Upgrade Review – Dec. 7, 2006 14

How to Upgrade for DAQ 1000 § 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 L 2 abort problem Estimated cost (mostly to produce new RDOs ) : ~100 k$ Must verify power distribution and cooling Need to test concept To go faster H. Matis Add more ADCs on a ladder Increase # of RDOs Maximum readout speed at FEE level – 10 MHz Tracking Upgrade Review – Dec. 7, 2006 15

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 H. Matis Tracking Upgrade Review – Dec. 7, 2006 16

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) H. Matis Tracking Upgrade Review – Dec. 7, 2006 17

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 Tracking Upgrade Review – Dec. 7, 2006 18

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 Tracking Upgrade Review – Dec. 7, 2006 19

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 H. Matis Tracking Upgrade Review – Dec. 7, 2006 20

H. Matis Tracking Upgrade Review – Dec. 7, 2006 21

H. Matis Tracking Upgrade Review – Dec. 7, 2006 22

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 H. Matis Tracking Upgrade Review – Dec. 7, 2006 23