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
Eddy Jans
0
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.
25 January 2007
VELO sub-projects
Eddy Jans
1
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
Eddy Jans
2
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.
25 January 2007
VELO sub-projects
Eddy Jans
3
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
Eddy Jans
4
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
25 January 2007
VELO sub-projects
Eddy Jans
5
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
Eddy Jans
6
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
Eddy Jans
7
DP project
Dx
[mm]
0.4
0.3
0.2
0.1
-6
-4
-2
Dp [mbar]
Mod 7
0
0
2
4
6
Mod 3
-0.1
-0.2
-0.3
-0.4
(elastic) deflection:
0.3 mm @ 4 mbar
0.4 mm @ 5 mbar
25 January 2007
VELO sub-projects
Eddy Jans
8
Dp=pbeam-pdet
[mbar]
evacuation
foil
hits
sensors
side
25 January 2007
VELO sub-projects
Eddy Jans
9
Dp=pbeam-pdet
[mbar]
foil
hits
sensors
side
25 January 2007
venting
VELO sub-projects
Eddy Jans
10
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
Eddy Jans
11
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
25 January 2007
VELO sub-projects
Eddy Jans
12
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
Eddy Jans
13
Summary
what
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
IP8
2*1
15 Mar
1 Apr
JS+??
alignment
design
NL
1.5
1 Feb
15 Feb
JvdB+FM
production
NL
1.5
20 Feb
5 Mar
VU
align
IP8
2*0.5
15 Mar
23 Mar
JvdB+FM
design
NL
2
15 Apr
1 May
PdG+MvB
coding
NL
2
15 May
1 June
PdG+MvB
testing
IP8
2*1
15 Jun
1 July
PdG+MvB
design
NL
1
15 Feb
1 Mar
PdG+MvB
testing
IP8
2*1
1 Mar
10 Mar
PdG+??
prep
NL
0.5
15 Feb
1 Mar
MK/MD
prod. of test tool NL
0.5
1 Mar
15 Mar
NIKHEF/CERN?
testing
??
2*0.2
15 Mar
1 Apr
MK+MD+RD
prep
NL
2*1
20 Feb
15 Mar
MD+LJ
testing
IP8
2*0.5
15 Mar
1 Apr
MD+LJ
leak rate++
IP8
2*2
10 Mar
1 April
LJ/MD/BM/FM
motion
bake out
turn over
Dp
vacuum comm.
25 January 2007
VELO sub-projects
Eddy Jans
14