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Progress and status of the SSD

Progress and status of the SSD. Lilian Martin - SUBATECH STAR Collaboration Meeting CalTech, Pasadena February 2004. SSD ?. SSD = Silicon Strip Detector (SDD= SVT ) Proposed and designed to enhance the STAR tracking capabilities in the central region.

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Progress and status of the SSD

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  1. Progress and status of the SSD Lilian Martin - SUBATECH STAR Collaboration Meeting CalTech, Pasadena February 2004

  2. SSD ? • SSD = Silicon Strip Detector (SDD=SVT) • Proposed and designed to enhance the STAR tracking capabilities in the central region. • Double-sided silicon, 20m in r, 700m in z • 16 modules x 20 ladders = 320 detectors • 2 in r, -1<<+1, 1 m², 500 k channels.

  3. SSD Production • A year ago… • Only one ladder built • The modules production slowly started • The new readout boards were in design • Serious geometrical interferences with the SVT appeared • Can do 6 ladders, must do 10 ladders • 6 months ago… • 10 ladders assembled (in about 3 months) • RDO been produced and geometrical problems cleared • Installation at BNL started

  4. SSD Installation (I)

  5. SSD Installation (IIa)

  6. SSD Installation (IIb)

  7. SSD Installation (IIIa)

  8. SSD Installation (IIIb)

  9. SSD Installation (IVa)

  10. SSD Installation (IVb)

  11. SSD Installation (IVc)

  12. SSD Integration (I) • Slow control ready (GUI, procedure on the Web) • Alarm Handler in progress • Online histograms being integrated

  13. SSD Integration (II) • Problems : • Readout board power supply failure (fixed by the STSG) • L2_ACCEPT (temporary fixed by the trigger Group) • The SSD does not handle correctly the L2_ACCEPT command • The L2_ACCEPT is currently absorbed by the SSD TCD board • The L2_ABORT seems to work. • One RDO board refuses to talk…can not program the FPGAs via the JTAG line/protocol • Trying to identify the break on the JTAG line • Probably a long access required (West pole tip removal) • The FEE chips are loosing their bias erratically • Due to a parasitic reset signal triggered somewhere • Needs a permanent monitoring by the shift crew and a definitive fix.

  14. SSD Integration (III) • Few usual problems : • Connection lost with the SC VME crate • LV Power supply failures • Need to pay attention to them… • The SSD runs smoothly with the other subsystems • No bad events as often seen last year • Occupancy of few percents • First physics run in Jan,15th • Since about 10 days, the SSD is in the runs on regular basis.

  15. First results (Pedestal and noise) Ladder 9 N-side Ladder 9 P-side Pedestals ADC count Ladder 9 N-side Ladder 9 P-side RMS 4 2 Strip ID DAQ cut : S > 5 , 1.6 to 2 time the noise

  16. First results (Signals) P-side S ~ 56 Landau Fit Cluster reconstruction on both sides of the wafers N-side S ~ 47

  17. First Results (Cluster matching) Correlation between the strip ID of the clusters on a wafer Strip P Strip N Strip P – Strip N Crossing range = 15 strips

  18. First Results (Charge matching) Signal P Correlation between the total charge of the clusters on a wafer Cut at (Strip P – Strip N) < 10,  collecting some noise… No cluster associations :  Ghost hits… Signal N Signal P / Signal N

  19. SSD Integration (Offline) • First crude pass over the data • Common set of cuts for all wafers/ladders : cluster reconstruction (N, S/N), cluster matching (strip ID range, total charge) • Not to bad so far… • Short term list… • Specific cuts for every wafer/ladder : quantify efficiency • Cluster association : work on cluster ambiguities • TPC track to SSD hit matching : • work on the alignment • quantify the position resolution and dE/dx capabilities • work on tracking integration • But done with independent software : must switch to the official STAR offline chain now…

  20. SSD Integration (software) Data • DAQReader : SsdReader ready (Herb) • Reconstruction : Existing software updated and been reviewed • StEvent : existing, cosmetic changes • ITTF : StiSsdDetector… in development • Simulation : geometry updated (Max) • Db : first table in, others hardwired in the code, extension and filling needed • Alignment : needs work, starting from StSvtAligmnent ? (used for a SSD study some time ago) • Hopefully more people involved : Christelle Roy (Coordinator), Abdel Boucham, Jerome Baudot, Joerg Reinarth and myself. Simulation sisdgeo.g StSsdSimulation SsdReader Db Geom,calibration Reconstruction SsdPointMaker Alignment StSsdAlignment StEvent StSsdHits ITTF StiSsdDetector

  21. SSD Production (I) • We intended to continue the module/ladder production after the 10 first ladders but… • Had to extend the contract with Thalès for the module production • Had to hunt for / buy extra components (wafer,chips,hybrids) for the rest of the production • Were busy with the first half integration • A bit over optimistic !

  22. SSD Production (II) • About 50 modules already in the labs • Thalès has started the module production • Target date is the end of May for the latest module delivery in the labs • The mechanical ladders are produced and equipped with ADC and Control boards • The 7-ladder mechanical sectors are ready. • Time to start assembling ladders again…

  23. SSD Final Installation • Shutdown scenario rather similar to last year : • Upgrade the RDO for the next run • Getting the SSD correctly handling the L2_ACCEPT • Adjust the internal SSD timing for 20 ladders • Needs to be done before the DAQ and Trigger go in vacations • Add an extra crate for the LV • Cone moved on the clear room roof on 06/17 back in STAR on 08/30 • Installation of the ladders on the cone while on the roof • SSD/SVT survey done on the floor • External shield before the cone rolls in the TPC • Summer 2004 looks like 2003

  24. SSD Final Installation 2002 2003 2004 1 ladder 10 ladders 20 ladders

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