1. 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
DP-project
VELO vacuum commissioning
LHCb installation planning
summary + timelines
25 January 2007
VELO sub-projects

2. clean up SX &4
Spaces and 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.
25 January 2007
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.
25 January 2007
VELO sub-projects

4. Alignment Alignment procedure uses 5 fiducial
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.
25 January 2007
VELO sub-projects

5. Install new alignment points above and below the existing ones.
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
25 January 2007
VELO sub-projects

6. Motion Estimated time: thinking: 2 mw implementation: 2 mw
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
25 January 2007
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
25 January 2007
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
25 January 2007
VELO sub-projects

9. DP project (elastic) deflection: 0.3 mm @ 4 mbar 0.4 mm @ 5 mbar Dx
Dp [mbar]
(elastic) deflection:
0.3 4 mbar
0.4 5 mbar
25 January 2007
VELO sub-projects

10. Dp=pbeam-pdet [mbar] evacuation foil hits sensors side 25 January 2007
VELO sub-projects

11. Dp=pbeam-pdet [mbar] venting foil hits sensors side 25 January 2007
VELO sub-projects

12. change Dp-range and/or central Dp-value. Estimated time:
Possible remedy:
change Dp-range and/or central Dp-value.
Estimated time:
preparation: 2*1 mw
testing: 2*0.5 mw
25 January 2007
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 160 oC
vent ??
evacuate ??
determine leak rate
vent
seal “holes” with Varnish
Estimated time of NIKHEF-involvement: 2*2 mw
25 January 2007
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.
25 January 2007
VELO sub-projects

15. Summary what where time [mw] start at the latest on ready before who
2.003&4
cleanup
IP8
0.5
1 Mar
15 Mar
FM/MD/MK
cooling cables
connectorize
2*1
1 Apr
JS+??
alignment
design NL
1.5
1 Feb
15 Feb
JvdB+FM
production
20 Feb
5 Mar VU
align
2*0.5
23 Mar
motion 2
15 Apr
1 May
PdG+MvB
coding
15 May
1 June
testing
15 Jun
1 July
bake out 1
10 Mar
PdG+??
turn over
prep
MK/MD
prod. of test tool
NIKHEF/CERN? ??
2*0.2
MK+MD+RD Dp
MD+LJ
vacuum comm.
leak rate++
2*2
1 April
LJ/MD/BM/FM
25 January 2007
VELO sub-projects