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TPC Status. Pre-Commissioning. Phase 1 results see Oct Forum Phase 2 (till Nov 19): ‘endurance test’ for sectors, 2 days, 2 at a time Finalized cabling Better known gas composition Full DCS functionality: monitoring and storing of parameters (i.e. FEE temperatures)

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Presentation Transcript
tpc status
TPC Status

TB 07.11.06 Peter Glässel, Heidelberg

pre commissioning
Pre-Commissioning
  • Phase 1 results see Oct Forum
  • Phase 2 (till Nov 19):
    • ‘endurance test’ for sectors, 2 days, 2 at a time
    • Finalized cabling
    • Better known gas composition
    • Full DCS functionality: monitoring and storing of parameters (i.e. FEE temperatures)
    • ISEG HV: monitoring currents
    • Prepare sectors for transport
    • 2/3 done

Sector covers (cooled)

TB 07.11.06 Peter Glässel, Heidelberg

main results in phase 2
Main results in phase 2
  • FEE life: no single failure
  • Gain curves, gain margin A-side
  • HV trips:
    • Only seen with ISEG: fast hardware trip
    • Mainly seen for OROCs
    • regardless of trip current settings
    • No clear correlation with HV, time (conditioning?)
    • Modify time constant: with 15 M series resistor only one trip since 5 days on C-side
  • Gain spikes (high gain on a pad row): go away with time

TB 07.11.06 Peter Glässel, Heidelberg

slide4

Summary – IROC S/N

Measurements not available

TB 07.11.06 Peter Glässel, Heidelberg

slide5

Summary – IROC S/N

Measurements not available

TB 07.11.06 Peter Glässel, Heidelberg

slide6

Summary – OROC S/N

Measurements not available

TB 07.11.06 Peter Glässel, Heidelberg

slide7

Summary – OROC S/N

Measurements not available

TB 07.11.06 Peter Glässel, Heidelberg

sector a00 gain curves
SECTOR A00 gain curves

A00 - Gain

TB 07.11.06 Peter Glässel, Heidelberg

oroc a00 exchange
OROC A00 exchange
  • Wire broken
  • 150 V below max HV tested
  • Decision to exchange OROC
    • Preparations in parallel to phase 2 commissioning C-side: remove electronics (1 sector only), cabling, FEE frames
    • Yellow platform in non-standard asymmetric fashion (keep I-bars on A-side)
    • Re-test spare OROC before exchange
    • Time schedule till end Nov: 10 days delay

TB 07.11.06 Peter Glässel, Heidelberg

tpc transport to ux2
TPC transport to UX2
  • Technical questions for transport resolved
    • Transport document http://www.physi.uni-heidelberg.de/~glassel/TPC/TPC-transport/TPC-transport.pdf
    • Except maybe weather: T < 10 deg?
    • Preparations start late Nov, actual transport 4.12.?
  • Last minute technical problem for installation:
    • Connection rails are incompatible with BSF
    • need to be modified, redesign done, calculations pending
    • Critical part taking large forces (5.5 t vertical)
    • Load test needed
    • Have to be in place before transport: time schedule risk

TB 07.11.06 Peter Glässel, Heidelberg

spares reference
Spares, reference
  • Complete A-side phase 2 summary under https://webh06.cern.ch/alice-tpc-commissioning/documents/TPC_2nd_phase_summaryAside.ppt

TB 07.11.06 Peter Glässel, Heidelberg

oroc a00 pulser readout after wire broke
OROC A00 pulser readout after wire broke

A00 / OROC with broken wire(s)

Signal injected into cathode wires

4 FECs had several channels damaged

TB 07.11.06 Peter Glässel, Heidelberg