CR7 : Status of ALICE PMD

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CR7 Status of ALICE PMD
Y.P. Viyogi, IOP, Bhubaneswar

• Detector Fabrication and tests
• Electronics and Readout
• Auxiliaries
• Planning for installation

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PMD in ALICE
PMD
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PMD Layout
Converter Support Plate
Each module a Gas-tight unit With separate HV/LV
supply
Total channels PreshowerVeto 221,184
Unit Module
48 Nos. Total In two planes
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Status of detector fabrication
Unit module fabrication completed (Dec.
2006) Super-module assembly 38 completed, 10
remaining (to be completed by 15 April)
Quality assurance Gas leak tests all 38
done HV tests 22 completed (4 modules at CERN,
brought during beam test in Nov. 2006)
An assembled unit module
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Modules storage
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High voltage tests in lab
Isolating faulty cell
Module
Opto-coupler (spark count)
DIP switch
DMM
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Observations of HV tests

• Leakage current goes on decreasing with time.
• Spark is random and goes on decreasing with time.
• Leakage current and spark rate is sensitive to
  humidity.
• Average numbers of faulty cells is 10 to 12 in a
  module.

Average no. of sparks measured for 3 hours of
interval. Voltage applied -1600V
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High Voltage tests cut channels
One chamber so far had to be opened and
repaired Typically no. of cut channels lt 1 so
far Leakage current in tested chambers 0.1-0.4
µA
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Detectors in beam tests at PS, SPS(November 2006)

• Two back-to-back modules (veto-preshower
  configuration) used
• Readout using CROCUS (one set FRT/CRT provided by
  Orsay) for the first time
• HV control using DCS
• Experience with EASY system of CAEN for LV supply
• At SPS, count rate increased upto radiation alarm
  level, spark rate and leakage current monitored,
  no visible deterioration
• Data analysis in progress

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PMD Electronics, Readout
Scheme very similar to Muon Tracking

• Backplane PCB (one for each module)
• Provides connection from detector to FEE boards
  thru a cutout and flexible kapton cables
• Has bus tracks for readout
• Maximum number of FEE boards in a row 12, 24
  (for two types of SMs)
• Connectors for Translator Boards, Bridge Boards,
  and FEE boards
• Power planes for entire module

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Status of electronics/readout
FEE boards Required 3500 after a lot of
administrative hurdle, order for assembly
released, components delivered to the assembly
unit, trial run to start in two weeks, delivery
in full by end-May 2007. Tests/calibration by
end-Aug. 2007 300 boards assembled in lab (One
module needs 72 boards) Translator Boards/Bridge
Boards/Backplane All pieces wired and
tested General tests of FEE boards,
chains Using the prototype CROCUS from
Orsay, valuable experience, greatly helped in
debugging chains on backplanes, TB, BB
etc. Three set of testing setup ready (one with
CROCUS, two with PCI card of Cagliari)
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CROCUS mass production

• Procurement through Orsay only CRT, and trigger
  electronics (FFT and FTD) boards
• These are now ready at Orsay
• FRT boards (30 no.) to be wired in India, Orsay
  provided all the technical literature, material
  procurement completed, first prototype wiring in
  progress, to be tested at Orsay in April/May.
• CROCUS mechanics ordered, already arrived at
  CERN.
• Concern FRT boards, to be mass produced only
  after validation of the prototype, no test
  facility in India.
• Hope to have all the boards by Sept. 2007

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DCS status

• Detector FSM Basic version existed in PVSS 3.1
  and tested during test beam, further development
  being done after shifting to PVSS 3.6
• Low Voltage hardware just arriving,
• two 3025B modules delivered by CAEN
• Tested in the lab with PVSS and framework
• Just started work on the LV FSM
• High Voltage (hardware already at CERN)
• PVSS exists and tested with hardware
• Panels tested at test beam time in October
• Configuration is being done
• FSM basic version tested
• Final version to be finalized by April end and
  tested with hardware
• Temp Monitoring Implemented in PVSS 3.1
• Crate Control We shall use the standard tool
  developed by Alice Controls Coordination
  Committee
• Project to be completed by July.

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Auxiliaries
Gas distribution system done by CERN gas group,
ready for commissioning LV Supply all
deliveries by end of July Mechanical support
delivery by end-May, expected at CERN
mid- June Cooling design completed,
fabrication part of support structure Cabling
delivery to be completed by mid-May laying of
cables at Point 2 June Patch panels getting
ready, to arrive CERN by end-May
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Planning Important Milestones
First batch of 24 modules at CERN April 23,
2007 Offline tests start in bldg 581 April 30,
2007 All modules at CERN June 15, 2007 First
batch of electronics for 6 modules at CERN June
15, 2007 Final batch of electronics at CERN
Sept.10, 2007 Cabling etc. June 30,
2007 Support structure at CERN June 11
2007 Surface Installation at Pt-2 begins June
18, 2007 Installation and Pre-commissioning at
surface ends Aug. 31, 2007 Installation within
L3 Sept 17-25, 2007 Tests and final
Commissioning Oct. 31, 2007