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EMCAL Calibration & Assembly at Yale University

EMCAL Calibration & Assembly at Yale University. Mark Heinz, Project Mgr EMCAL Meeting Nantes July 15, 2008. Status. Facilities for Assembly and Calibration are ready Cosmic scintillator trigger parts are scheduled for delivery by July 31.

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EMCAL Calibration & Assembly at Yale University

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  1. EMCAL Calibration & Assembly at Yale University Mark Heinz, Project Mgr EMCAL Meeting Nantes July 15, 2008

  2. Status • Facilities for Assembly and Calibration are ready • Cosmic scintillator trigger parts are scheduled for delivery by July 31. • Subsequently configuration and testing for signals and position resolution can start. Final electronics configuration will be determined after first tests with final scintillators setup. • Goal: Be ready for triggering cosmics by Sep 15. • EMCAL DAQ (incl FEE, DCS): Configured at CERN and ready to be shipped to Yale (thanks to David & Terry) • Software for data-taking: available from test-beam (CERN CVS D.Silvermyr) and further development in Aliroot by offline group • Software for triggering and analysis: first analysis tools available by Grenoble (Sebastien) and WSU (Aleksei). Further development in collaboration with Grenoble/WSU • SM Shipping contract (Yale-CERN): Initial bids by 2 international logistics firms expected. Negotiation stage to start soon. EMCAL Meeting July 2008

  3. Yale Calibration Lab • Facilities are adjacent to RHI offices, and within 50m of truck loading dock. Room 1: Main Calibration Lab Room 2: Storage & Packaging EMCAL Meeting July 2008

  4. Scintillator triggers • 16 scintillator slats ordered for each site (Yale/Grenoble) from EljenTechnology (Texas, US). • Each slat will be read-out by 2 PMT’s on opposite ends. • Configuration will allow to accumulate data & calibrate ¼ (Yale), 1/3 (LPHC) SM during one run (12 hours) • Coincidence signal between 2 slats (up & down) will be organized (1 strip module). • PMT Timing and Amplitude information will be processed CAD by JFM EMCAL Meeting July 2008

  5. Other Trigger Components • Power Supplies for PMT (32 channels) • Custom-Made (N.Smirnov) Cockroft-Walton (CW) power base separately at Yale • Grenoble uses different PMT’s 1 unit for 2x4 channels shown EMCAL Meeting July 2008

  6. Trigger Electronics (version 1) Meeting Yale-Grenoble , March 11, 2008 EMCAL Meeting July 2008

  7. 4-fold coincidence Trigger Setup (version 2) Thanks to University Houston & BNL for temporary donation of critical components 4 channels PS710 IN REGISTOR, 6 channels PS754 4 channels Gate Generator PS705 PS794 “FAST” OR BUSY 24 “D” channels PS710 ADC GATE OR 4 channels OUT 4 channels “FAST” OR VETO PS754 4 channels PS710 PS715 4 channels START TDC PS715 “FAST” OR PS710 D.L. ADC 24 channels 24 channels D.L. STOP TDC “FAST” OR PS776 CR200 0.25 µs Shaper/Discriminator 24 “A” channels EMCAL Meeting July 2008

  8. Time-Difference Measurement • Goal is to be able to get position measurement of cosmic track along strip-module coordinate using timing difference. Can be used during offline analysis. • Additional possibility maybe to use ADC information • Nikolai did a preliminary study (using available scintillator, different dimensions) • This needs to be repeated with final scintillator and incorporated into datastream. EMCAL Meeting July 2008

  9. Handling Tools • Grenoble has designed and manufactured a set of strip handling tools for Yale. These will be shipped by the end of the month. • This also includes support structures for Scintillator positioning for cosmic test. • In return Yale has purchased Scintillator strips for the Grenoble lab. EMCAL Meeting July 2008

  10. SM Calibration Procedure • Common Yale/Grenoble approach has been agreed upon and a draft documentation is available on web: • http://rhig.physics.yale.edu/~heinz/alice/cosmic_calibration/ • Most important steps are: • Mount SM-crate on shipping platform • Test each Strip-Module with LED before insertion • Install strip modules 1-8(6) • First LED&pedestal run with nominal gain • Cosmic trigger aligned with strip 1-8(6) & start 1st cosmic run • Analyze data and obtain MIP peaks, determine new APD bias • Remove any bad strips found. • Repeat with strips 9-16, and 17-24 EMCAL Meeting July 2008

  11. Summary • On track: • Cosmic trigger parts available for installation by July 31. Configuration and setup thereafter will take 1-2 months. • EMCAL DAQ will be in place at Yale/Grenoble labs by end of July. Needs to be tested. • Next steps (Yale/Grenoble): • Software needs to be developed/adapted to the cosmic trigger setup. Analysis tools need to be streamlined. • Outstanding Issues (Yale): • HV EMCAL supply needs to be ordered for Yale • EMCAL Test-modules need to be made available at Yale by Mid-August to commence realistic trigger testing. EMCAL Meeting July 2008

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