TPC Status Report

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TPC Status Report
Project leader Peter Braun-Munzinger, GSI
Darmstadt Deputy project leader Johanna
Stachel, Heidelberg Technical coordinator
Peter Glässel, Heidelberg
2
Outline

• Summary of Pre-commissioning
• OROC 00 exchange
• Noise study
• Last round of FEE testing
• TPC/TRD heat screen
• Transport of TPC
• Insertion of TPC into SF
• Commissioning
• Activities parallel to ITS installation
• Final commissioning in situ

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OROC exchange

• Broken anode wire in OROC 00
• Clearly caused by melting
• It is still unclear, how this can happen
• Studies with a test sector in preparation
• Mounting tool modified
• longer lever due to presence of SSW
• Complicated procedure, it required
• Removing FEE and frames of full sector
• Exchange of feet of FEE frames of neighboring
  sectors by smaller versions to allow removal of
  sealing bars
• Remove pt1000 sensors on ROC body
• Yellow platform in modified setup (cope with
  I-bars)
• Exchange itself without any problems

4
Sealing bars close to FEE frames

• Removal of bars conflicts with feet of FEE frames
• Feet exchanged by modified ones

5
ROC exchange
310 mm more
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OROC A00 exchange
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Optimizing OROC Noise

• OROC corners were known to show higher noise,
  typically up to 5 ADC cts with the grounding
  scheme as tested in the lab.
• In the lab never tested with all FEC installed
• IROCs dont show corner noise
• Study optimizing the grounding scheme on one
  sector
• New scheme
• 18 thicker grounding cables in the OROC edges
• 8 cables omitted in center
• noise reduced to center value for random signals
• Test of this optimized scheme on another sector
• Implementation in a 2-day heroic effort of
  Lucianos team

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Original grounding scheme
Pedestal Measurments noise
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Original grounding scheme
Optimization of the ground scheme
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New grounding scheme, all signals in phase
Optimization of the ground scheme

• thicker ground cable (6mm copper braid) on
• rp6, FECs 0, 1, 2, 3, 8, 9, 10, 11, 16, 17, 18,
  19
• rp5, FECs 0, 1, 18, 19
• rp4, FECs 0, 19

• no ground cable on
• rp6, FECs 4, 5, 6, 7, 12, 13, 14, 15

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New grounding scheme4 signal groups with 90 deg
phase shift
Optimization of the readout scheme
12
IROC/OROC noise comparison
Noise of the whole sector final ground and
optimized readout
13
TPC/TRD heat screen installed

• Except for some panel at bottom for ITS entry

14
Getting the TPC travel-ready

• Last leak tests on cooling system (ROC, FEE, SSW
  covers, inner heat screen
• Last cabling items
• Last dry test of FEE of all sectors after
  closing with cover (lt10 min without cooling)
• Store cables on TPC (DDL and pulser cables are
  quite long) to allow moving out of DF
• Packaging
• Heating and temperature monitoring system
• Acceleration monitoring (Michael Guinchard).
• Disconnect from gas system, purge from CO2 / N2
  bottle
• Ready before Christmas

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Transport to UX2

• Complicated for two reasons
• Allowed deformation of the DF lt3mm
• Two TPC feet kept floating on hydraulic jacks to
  ensure NO deformation of TPC
• Limit of movement TPC vs SSW 3mm (FEE cables to
  ROC)
• Lowering onto four posts always with coupled
  hydraulics
• Clearance of DF to ground on crane in SXL2 not
  sufficient for trailer ? intermediate position on
  ground with hydraulics for lifting to trailer
  height
• DF deforms easily if not supported level ? manual
  corrections during trailer transport

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Trailer transport SXL2 to SX2
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Trailer transport SXL2 to SX2
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Descend to the cavern

• 2 hours for descent

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TPC insertion into SF
40 cm to IP

• Test-drive with TPC to IP
• Align TPC, SF, ITS rail sys at IP
• Back to parking position
• Window of about 2 weeks
• Check alignment SSW vs TPC
• Re-test all FEE (all sectors)
• Installation of beam line and ITS

at IP
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Inside heat screen on ITS platform
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Activities during ITS installation

• Installation and tests with DCS
• power supplies (LV, HV)
• Gate pulsers
• Calibration pulsers
• Cooling system (testing with 2 dummy sectors in
  situ)
• Prepare 100 kV cable

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Commissioning in situ

• After ITS installation end (scheduled for
  24.5.07)
• Starting on C-side
• Connect C-side services to Back frame
• Re-commission gas system (temporary services on
  A-side)
• ACORDE and laser triggers
• Connect 100 kV drift HV
• Commissioning A-side has to wait for Miniframe
  (Jul 07)

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Summary

• TPC in good shape before transport
• Transport to UX2?
• Insertion into SF ?
• ITS installation next
• Access for TPC tests before ITS arrives
• Preparations for commissioning in situ started
• On schedule

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-- Spares --
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TPC/TRD heat screen