Velo meeting january 25 2007
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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


Velo meeting january 25 2007

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


Velo meeting january 25 2007

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


Velo meeting january 25 2007

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


Velo meeting january 25 2007

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


Velo meeting january 25 2007

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


Velo meeting january 25 2007

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


Velo meeting january 25 2007

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


Velo meeting january 25 2007

DP project

Dx

[mm]

Dp [mbar]

(elastic) deflection:

0.3 mm @ 4 mbar

0.4 mm @ 5 mbar

VELO sub-projects


Velo meeting january 25 2007

Dp=pbeam-pdet

[mbar]

evacuation

foil

hits

sensors

side

VELO sub-projects


Velo meeting january 25 2007

Dp=pbeam-pdet

[mbar]

venting

foil

hits

sensors

side

VELO sub-projects


Velo meeting january 25 2007

Possible remedy:

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

Estimated time:

preparation: 2*1 mw

testing: 2*0.5 mw

VELO sub-projects


Velo meeting january 25 2007

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


Velo meeting january 25 2007

  • 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


Velo meeting january 25 2007

VELO sub-projects