phenix run-13 status
DESCRIPTION
PHENIX Run-13 status. Hubert van Hecke. Commissioning continues. VTX stripixels. Commissioning was going well in December, but Massive leaks were seen in the outer barrel layer of the VTX ( stripixels ) - PowerPoint PPT PresentationTRANSCRIPT
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Hubert van Hecke - 19 Feb 13 Time meeting 1
PHENIX Run-13 status
Hubert van Hecke
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Hubert van Hecke - 19 Feb 13 Time meeting 2
Commissioning continues
• Commissioning was going well in December, but
• Massive leaks were seen in the outer barrel layer of the VTX (stripixels)
• Removed the East half of the detector, disassembled it, reassembled with only the FVTX, and reinstalled in the IR
• Investigation identified galvanic corrosion between carbon and Aluminum as the cause
• VTX pixels (inner 2 barrels) and FVTX don’t use Aluminum
FVTX
FVTX
VTX stripixels
VTX stripixels
VTX pixels
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Hubert van Hecke - 19 Feb 13 Time meeting 3
Commissioning continues
• FVTX back and operating (>98% live channels)• Flammable gas is on since Feb 1, 2-person watch shifts started Jan 22• Cosmics taken since 4 Feb, ongoing when no beam• Shielding wall rolled in on 7 Feb, area closed up on 8th
• Test runs with all (~20) subsystems today
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Hubert van Hecke - 19 Feb 13 Time meeting 4
Near-term objectives
• When no beam, run cosmics– Cosmics are needed to study momentum smearing, charge-sign efficiencies, trigger
issues, backgrounds etc.– Cosmics will be collected in beam down-time periods throughout the run
• Commission with beam as it arrives• Access during the day, as needed