EMCAL Calibration & Assembly at Yale University
Mark Heinz, Project Mgr
EMCAL Meeting NantesJuly 15, 2008
Mark Heinz EMCAL Meeting July 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.
Mark Heinz 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
Mark Heinz 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
Mark Heinz 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
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Trigger Electronics (version 1)
Meeting Yale-Grenoble , March 11, 2008
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PS710
PS710
PS710
PS710
4 channels
4 channels
4 channels
4 channels
4 channels
4 channels
PS754
PS754
PS705
PS715
PS794
PS715
D.L.
OUT
VETO
BUSY
“FAST” OR
START TDC
ADC GATE
D.L.24 channels 24 channels
STOP TDC
24 “A” channels
ADC
24
“D
” c
ha
nn
els
PS776 CR2000.25 µs
“FAST” OR
“FAST” OR
“FAST” OR
OR
IN REGISTOR, 6 channels
Trigger Setup (version 2)Thanks to University Houston & BNL for temporary donation of critical components
Shaper/Discriminator
4-fold coincidence
Gate Generator
Mark Heinz 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.
Mark Heinz 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.
Mark Heinz 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:1. Mount SM-crate on shipping platform2. Test each Strip-Module with LED before insertion3. Install strip modules 1-8(6)4. First LED&pedestal run with nominal gain5. Cosmic trigger aligned with strip 1-8(6) & start 1st cosmic
run6. Analyze data and obtain MIP peaks, determine new APD
bias7. Remove any bad strips found.8. Repeat with strips 9-16, and 17-24
Mark Heinz 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.
