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VELO-meeting January 25, 2007

VELO-meeting January 25, 2007. Sub-projects: SX8-2.003 & SX8-2.004 connectorize cooling cables alignment procedure motion test bake out procedure turn over project D P-project VELO vacuum commissioning LHCb installation planning summary + timelines. clean up SX8-2.003&4.

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VELO-meeting January 25, 2007

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  1. VELO-meetingJanuary 25, 2007 • Sub-projects: • SX8-2.003 & SX8-2.004 • connectorize cooling cables • alignment procedure • motion • test bake out procedure • turn over project • DP-project • VELO vacuum commissioning • LHCb installation planning • summary + timelines VELO sub-projects

  2. clean up SX8-2.003&4 Spaces 2.003 and 2.004 are future storage, repair and working places for the whole VELO + PU communities. With other people and parts/equipment approaching soon, our stuff needs to be reorganized/cleaned up. Estimated time: 0.5 manweek. VELO sub-projects

  3. Cabling • 22 Jan  16 Feb: • - pull long-distance (RB84  D3) analog cables by INEO • - “simultaneously” connectorize D3-side • 19 Feb  23 Feb: • - pull control cables (RB84  balcony) • 26 Feb  2 Mar: • - pull HV cables (RB84  D3) Cooling cables still need to be connectorized at both ends, i.e. RB84 and C3. Estimated time: 2*1 manweek. VELO sub-projects

  4. Alignment Centre Frame Fiducial Marks Alignment procedure uses 5 fiducial points on each side of center frame. However, these are soon not visible anymore due to the repeater crates, mounted on the detector hood. VELO sub-projects

  5. Solution: Install new alignment points above and below the existing ones. Watch out that the analog cable supporting frame is not in the way also. Estimated time: design: 1.5 mw construction: 1.5 mw implementation: 2*0.5 mw VELO sub-projects

  6. Motion • Increasing expertise with the system has revealed the • necessity to take a few additional safety measures. • Partly to be implemented in the PLC, partly in the PVSS application. • moving both XL and XR in the same direction from a position in • which XL=-XR, needs special precautions. • implement the possibility to stop the stepper motor when really • necessary (moving wrong way based on pot. meters, one side not • moving at all, etc.) Estimated time: thinking: 2 mw implementation: 2 mw testing: 2*1 mw VELO sub-projects

  7. Test bake-out procedure Bake-out procedure of rf-boxes has to be commissioned: regulation of lamps, temperature interlock, etc. Estimated time: preparation: 1 mw implementation: 2*1 mw VELO sub-projects

  8. Turn over project Rotation of the detector half is a delicate, not yet well-established activity. Likely solution: Use 2 small cranes. Either powered by hand or electricity. Estimated time: preparation: 0.5 mw production of test tool: 0.5 mw ? testing: 2*0.2 mw VELO sub-projects

  9. DP project Dx [mm] Dp [mbar] (elastic) deflection: 0.3 mm @ 4 mbar 0.4 mm @ 5 mbar VELO sub-projects

  10. Dp=pbeam-pdet [mbar] evacuation foil hits sensors side VELO sub-projects

  11. Dp=pbeam-pdet [mbar] venting foil hits sensors side VELO sub-projects

  12. Possible remedy: change Dp-range and/or central Dp-value. Estimated time: preparation: 2*1 mw testing: 2*0.5 mw VELO sub-projects

  13. VELO vacuum commissioning • Unacceptable leak rate (10-5 mbar.l/s) of rf-boxes necessitates • additional tests + attempts to (temporary) fix the problem. • Present plan with VELO + part I of the beam pipe: • evacuate • bake rf-boxes @ 160 oC • vent ?? • evacuate ?? • determine leak rate • vent • seal “holes” with Varnish • evacuate • determine leak rate • Estimated time of NIKHEF-involvement: 2*2 mw VELO sub-projects

  14. LHCb installation schedule • Coming months lots of activities from RICH1, TT, VELO • (HV, LV, ECS, etc.) in the vicinity of the VELO. Need for • coordination, flexibility and mutual cooperation. • Jan 22  Mar 2: • Cabling (analog + control) around the VELO. • March + April: installation LV-distribution boxes, • HV-patch panels • April 5: • Start bake out + commissioning of the complete • LHCb beam pipe. VELO sub-projects

  15. Summary VELO sub-projects

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