1. OT Survey & Adjustment 06-03-2007 Outline: Survey technique at present
what has been done and what there is to do
issues to complete OT alignment before pilot run
possible optimizations
long-term maintainance

2. Open Position Modules Bridge C-frame OT Cryo-Platform
Table & Cable Trays
December 9, 2018
Antonio Pellegrino

3. C Frames Distribution of cooling and gas Front-End Electronics Boxes
Detector Modules
Distribution of LV,HV, ECS/TFC, etc.
December 9, 2018
Antonio Pellegrino

4. C-Frame Survey 1 2 3 4 5 6 7 8 9 Survey Points: 2(X/U) x 2(T/B) x 9
Per point: two targets for position & distance
~1 day per C-frame
December 9, 2018
Antonio Pellegrino

5. Wheeled Support, Alignment, and Stop-and-Lock Blocks
C-Frame Adjustment
Long Beams (IPE 300)
Transversal Beams
C-Frame Rails
Wheeled Support, Alignment, and Stop-and-Lock Blocks
December 9, 2018
Antonio Pellegrino

6. Survey Work All data available at:
Surveyed completely 4 out of 6 C-Frames (C Side)
Work took usually 2-3 days of work
1st survey (1 day)
Adjustment (~0.5 day)
2nd survey (1 day)
Work needed
OT closed (hindered by beam-pipe )
survey people inside the magnet (no longer possible? )
scaffold inside the detector to (major shit! )
insert targets at the top
adjust the C Frame through alignment mechanism
All data available at:
December 9, 2018
Antonio Pellegrino

7. Achieved so far T2-Q02-XU X layer top and bottom no survey of U layer
T2-Q02-VX
V layer top and bottom
X layer bottom only
T1-Q02-XU
1 corner X layer bottom
2 points U layer top and bottom
T1-Q02-VX (1st survey, adjustment, then 2nd survey)
V layer only bottom
T3-Q02-XU & T3-Q02-VX
only corners for RASNIK installation
{T1,T2,T3}-Q13-{XU,VX}
no survey yet
December 9, 2018
Antonio Pellegrino

8. Problems to be solved Completion of OT alignment before pilot run:
Close OT or at least come into the region of the alignment blocks
access magnet area for survey
access top dowel pins for survey target installation
access alignment mechanism to adjust C-Frame position
“Maintain” the OT alignment (long-term):
access magnet area for survey
access top dowel pins for survey target installation
create possibility of survey from the A side
A side : survey point outside the detector
C side: survey point between A and C halves
December 9, 2018
Antonio Pellegrino

9. Optimize the survey targets
Currently used:
gives good resolution in position and distance
only one available (plus few spares)
needs two accesses per dowel pin (distance and position)
does not fit between two C-Frames
Alternative 1:
gives acceptable resolution in position and distance
can make 2 x 9
needs one access per dowel pin
does not fit between two C-Frames
Alternative 2:
gives good resolution in position and distance
can make many (432??)
needs no access
fits between two C-Frames
needs two survey stations in the magnet (triangulation)
December 9, 2018
Antonio Pellegrino

10. Reduce the number of survey points
Completion of OT alignment before pilot run:
must have all points (2 x 2 x 9 per C-Frame)
after adjustment can measure less points (1 x 2 x 5 per C-Frame)
“Maintain” the OT alignment (long-term):
can use a reduced set of points (1 x 2 x 5 per C-Frame)
December 9, 2018
Antonio Pellegrino

11. “Side Survey” Target Alternative 3 (side view):
gives good resolution in distance and acceptable in position
can make 18
needs one access per dowel pin
does not fit between two C-Frames
needs survey platforms to be made
create possibility of survey from the A side
A side : survey point outside the detector
C side: survey point between A and C halves
December 9, 2018
Antonio Pellegrino