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Water Incident and VELO Meeting Overview - October 27 at CERN

On October 27, a water incident occurred during human intervention in the magnet cooling water system at CERN's VELO. Significant components, including long-distance HV cables and distribution boxes, were affected by water spillage. A cleanup and repair process is estimated to take about 1.5 weeks. The VELO meeting held at Nikhef discussed the impact of this incident on beam vacuum systems and outlined necessary safety protocols related to dosimeter requirements. The session emphasized the distribution of shift loads for ongoing operations and data analysis tasks.

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Water Incident and VELO Meeting Overview - October 27 at CERN

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  1. VELO-issues @ CERN • water incident of October 27 • GV302 • dosimeters • shifts VELO-meeting @ Nikhef

  2. Water incident of October 27 Water was spilled during human intervention of magnet cool water system Long-distance HV cables, distribution boxes and short Lemo-HV cables got “soaked”. Drying, cleaning, repairing estimated to take ≈1.5 week VELO-meeting @ Nikhef

  3. GV302 • - normally closed type • looses its closed • contact after ≈3 • hours. If this happens • for 25 seconds the • vacuum PLC closes the • valve. VELO-meeting @ Nikhef

  4. Effect of closing of GV302 on beam vacuum VELO-meeting @ Nikhef

  5. present setup by VAC-valve expert of CERN proposed setup VELO-meeting @ Nikhef

  6. Dosimeters rad course dosi Kazu Akiba Yes Yes Eddy Jans Yes Yes Tjeerd Ketel Yes Yes Luc Jansen Yes Yes Bart Verlaat Yes Yes Martin Doets Yes Yes Martin van Beuzekom Yes Yes Hans de Vries Yes No Chiara Farinelli Yes No Serena Oggero Yes No Piet de Groen Yes No Ivan Mous Yes No Wilco Vink Yes No Frans Mul Yes No Gertjan Mul No No Krista de Roo No No Erno Roeland No No Marco Kraan No No Berend Munneke No No • To get a dosimeter you: • must follow at CERN • the half-day radiation • course • have a recent • (< 6 months old) • medical certificate • including blood count VELO-meeting @ Nikhef

  7. Shifts • Tasks of VELO-shifter after ECS + data-analysis training: • go through powering up procedure • perform IV scan and compare data, • take NZS-data, analyse and look for evidence of extra noise • determine noisy and dead strips • take ZS runs, analyse data and look for differences • take NZS round robin data, analyse and compare with ZS • error bank analysis, make compilation of issues • go through powering down sequence VELO-meeting @ Nikhef

  8. Proposed distribution of shift load for 2009 Institute Res Comm Total Shifts Blocks of 6 shifts Bristol 0 1 1 5.7 1 CERN 2.5 0 2.5 14.3 2 Glasgow 2 3 5 28.7 5 Lausanne 2 0 2 11.4 2 Liverpool 3.5 4 7.5 43 7 Manchester 1 0 1 5.7 1 MSU 2 1 3 17.2 3 Nikhef 2 5 7 40.2 7 Oxford 1 1 2 11.4 2 Syracuse 1 2 3 17.2 3 UCD 2 2 4 22.9 4 Warwick 0 1 1 5.7 1 a “block” is a sequence of 2 day + 2 evening + 2 night shifts. VELO-meeting @ Nikhef

  9. Proposed distribution of shift load for 2009 VELO-meeting @ Nikhef

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