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

Mark Heinz EMCAL Meeting July 2008 6

Trigger Electronics (version 1)

Meeting Yale-Grenoble , March 11, 2008

Mark Heinz EMCAL Meeting July 2008 7

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.