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Repair of ‘guillotine valves’ Repair converter (just after T4 TAX – quite radioactive !)

DROPPED. WORK organised / done by or with ATB/EA. Repair of ‘guillotine valves’ Repair converter (just after T4 TAX – quite radioactive !) Invert order of FISCs (AB internal) Vacuum in KABES region Reading of vacuum pumps Magnetic field settings and readings

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Repair of ‘guillotine valves’ Repair converter (just after T4 TAX – quite radioactive !)

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  1. DROPPED WORK organised / done by or with ATB/EA • Repair of ‘guillotine valves’ • Repair converter (just after T4 TAX – quite radioactive !) • Invert order of FISCs (AB internal) • Vacuum in KABES region • Reading of vacuum pumps • Magnetic field settings and readings • Complete software for K12-specific items:P0-survey, K12SURV XCLD • Support for lead shield in between hodoscopes • Remove HAC and Muon veto • Installation of a MBPL in HAC region • Prepare for installation of a CEDAR in SCR region ATB work for 2007 run

  2. Preliminary Beam commissioning run:23-25 MayNo access to ECN3 !! Start of proton beam in ECN3:19 June End of proton beam:26 October -200 GeV/c pion beam *): 31 October till 11 November *) -180 GeV/c option under study ATB work for 2007 run

  3. “Version 1.0-e” ATB work for 2007 run

  4. Repair of guillotine valves: • Need to make space by moving HAC • Partial dismounting of ventilation system • Work in Nitrogen atmosphere. • Planned for week 14 (April 2nd)Possibly earlier, but no commitment ATB work for 2007 run

  5. Invert order of FISCs Ongoing now Repair converter • Must be IN beam for electron beams • Must be OUT for all other beams • For the moment stuck IN beam Problem:just behind TAX – very radioactive (7 mSv/hr!) Wait as long as possible for cooldown Will be repaired of replaced ATB work for 2007 run

  6. Vacuum in KABES-2 region • KABES-2 will be removed (KABES-1 is out anyway).Continuous vacuum through KABES • For RICH test (October) : remove vacuum downstream of scrapersMay have to remove part of neutron shielding wallDepending on length of RICH prototype ATB work for 2007 run

  7. Reading of vacuum pumps • Cabling problem (?) for some pumpsShould not be a show-stopper • One pressure reading is available at position 86, upstream of theblue tube but in direct vacuum ‘contact’If no KABES installed, two more pumps are directly connected to the blue tube • I.Efthymiopoulos investigating what can be done.Conflicting with LHC priorities in other groups ATB work for 2007 run

  8. Magnetic field settings and readings For a limited period during the 2006 run, not entirely by chance overlappingwith the K12 run, magnet settings and readings were not reliable. The diagnosis was hampered by the presence of three simultaneous problems: • An increasing number of H/W faults on address cardsA systematic campaign of tests and repairs has been done Some 14% were found faulty. Consequently often several rectifiers replied to the same command….. 2) Too many address cards on the same ‘databus’ interface cardVoltage drop lead to additional instabilities Showed up when P42+K12 was activated 3) The addressing sequence was too fast, the reading was done before thevoltage had stabilisedDrivers added to stabilise voltage These problems have now been identified and repaired, should be ok,to be definitively validated for MNP33 before start-up (as early as possible). ATB work for 2007 run

  9. Software items • P0-SURVEYEssential for operationSurvey functionality exists, but configuration remains to be completedWill be integrated in Software Interlock System – before DSO tests • K12SURVFor access to technical gallery Will close TAX if TAX range changed during access • XCLD controlAnyway possible to control via FESA low-level softwareGUI to be written – possibly at the last moment ATB work for 2007 run

  10. Support for lead shield in between hodoscopes Conceptual design proposed by S.Girod Bolted onto yellow hodoscope frames (M8 screws)Total weight : approx. 250 kg for Lead + 50 kg for support ATB work for 2007 run

  11. Preferred First proposals (last week): ATB work for 2007 run

  12. Stability against buckling still to be verified ATB work for 2007 run

  13. Two possibilities for filling with lead: • Lead bricks50 bricks have been delivered to ECN3, out of which 25 are new Size 20 x 10 x 5 cm. Disadvantages: cracks in between, height marginal (3 hodoscope strips = 19.5 cm) • Lead sheets, e.g. 5 mm thickMust be purchased Could be 5 mm thick, 21 cm high, e.g. 50 cm wide. Total width 250 cm. Offset layers by 10 mm, so that cracks are not aligned • Can be done by AB-ATB-EA • P326 funding required (material cost + FSU time) ATB work for 2007 run

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