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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
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

slide2

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

slide3

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

slide4

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

slide5

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

slide6

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

slide7

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

slide8

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

slide9

DP project

Dx

[mm]

Dp [mbar]

(elastic) deflection:

0.3 mm @ 4 mbar

0.4 mm @ 5 mbar

VELO sub-projects

slide10

Dp=pbeam-pdet

[mbar]

evacuation

foil

hits

sensors

side

VELO sub-projects

slide11

Dp=pbeam-pdet

[mbar]

venting

foil

hits

sensors

side

VELO sub-projects

slide12

Possible remedy:

change Dp-range and/or central Dp-value.

Estimated time:

preparation: 2*1 mw

testing: 2*0.5 mw

VELO sub-projects

slide13

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

slide14

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

slide15

Summary

VELO sub-projects

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