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29 October NikhefEddy Jans 0 CERN water incident of October 27 GV302 dosimeters shift s.

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Presentation on theme: "29 October NikhefEddy Jans 0 CERN water incident of October 27 GV302 dosimeters shift s."— Presentation transcript:

1 29 October NikhefEddy Jans 0 CERN water incident of October 27 GV302 dosimeters shift s

2 29 October NikhefEddy Jans 1 Water incident of October 27 Long-distance HV cables, distribution boxes and short Lemo-HV cables got “soaked”. Drying, cleaning, repairing estimated to take ≈1.5 week Water was spilled during human intervention of magnet cool water system

3 29 October NikhefEddy Jans 2 GV302 - normally closed type - looses its closed contact after ≈3 hours. If this happens for 25 seconds the vacuum PLC closes the valve.

4 29 October NikhefEddy Jans 3 Effect of closing of GV302 on beam vacuum

5 29 October NikhefEddy Jans 4 present setup by VAC-valve expert of CERN proposed setup

6 29 October NikhefEddy Jans 5 Dosimeters rad course dosi 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 KazuAkibaYesYes EddyJansYesYes TjeerdKetelYesYes LucJansenYesYes BartVerlaatYesYes MartinDoetsYesYes Martinvan BeuzekomYesYes Hansde VriesYesNo ChiaraFarinelliYesNo SerenaOggeroYesNo Pietde GroenYesNo Ivan MousYesNo WilcoVinkYesNo Frans MulYesNo Gertjan MulNoNo Krista de RooNoNo ErnoRoelandNoNo MarcoKraanNoNo Berend MunnekeNoNo

7 29 October NikhefEddy Jans 6 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

8 29 October NikhefEddy Jans 7 Institute Res Comm Total Shifts Blocks of 6 shifts Bristol CERN Glasgow Lausanne Liverpool Manchester MSU Nikhef Oxford Syracuse UCD Warwick Proposed distribution of shift load for 2009 a “block” is a sequence of 2 day + 2 evening + 2 night shifts.

9 29 October NikhefEddy Jans 8 Proposed distribution of shift load for 2009


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