1. News and Introduction from CERN June 15th, 2005
Glad to be here and to look at phase 2 issues with SLAC. Thanks for the hospitality.
CERN participants:
R. Assmann (LHC collimation project leader, AB department)
A. Bertarelli (Lead engineer for mechanical collimator design, TS department)
M. Brugger (Radiation issues, SC department)
M. Santana Leitner (FLUKA energy deposition, AB department)
M. Magistris could not come…
CERN is very happy that SLAC is putting their collimator expertise onto a phase 2 prototype. Progress of SLAC work (as presented at last LARP meeting) was considered as very positive.
We are committed to help you as much as possible, though resources are getting increasingly difficult at CERN.
RWA, 13/6/2005

2. CERN Goals for this Meeting
Make sure early on that the technical design from SLAC is compatible with all LHC constraints:
Design assumptions and collimation requirements (RA).
Space constraints with two beams (AB).
Energy deposition studies (ML).
Radiation issues, like materials, dose, … (MB).
Define in a short note constraints for phase 2 collimators?
Look at SLAC design and provide feedback at your approach.
Present details of the overall LHC collimation system and the phase 1 components to SLAC, if required.
RWA, 13/6/2005

3. Overview of Collimation System18
RWA, 13/6/2005

4. Tunnel Components Vacuum pump Quick-connect flanges Beam 2 Collimator
Collimator support
Beam 2
Collimator
tank
Quick-connect flanges
Vacuum pump
Interconnect
support
Survey reference points
Motorization/sensors
R. Perret et al
RWA, 13/6/2005

5. Original “Collimator Installation Policy”
Collimators are late and should not be taken as a driving constraint for installation schedule.
There is no interference of collimators with installation of “cold” machine parts, which is highest priority and on the critical path.
For minimal impact the following scenario was agreed (S. Weisz):
Installation of all infrastructure (cables, water connections, …) during the standard infrastructure installation campaigns. Still true to my knowledge: all input defined.
Installation of all collimator supports (including phase 2) during standard machine installation campaigns, including connection of quick plug-ins and alignment of supports.
Installation of phase 1 collimators (as soon as available) in quick plug-in fashion (for radiation optimization): ½ hour per collimator!?
In case required: Installation of simple vacuum pipes (2 kCHF/piece) for missing collimators to not hold up general progress.
Now it is time to define details…
RWA, 13/6/2005

6. Topics for Discussion SLAC design compatible with space constraints?
Longitudinal.
Transverse.
Installation on 2nd beam pipe.
How to choose length and material (efficiency & impedance)?
Improve impedance?
Improve efficiency?
Improve both?
Improve operational usage (tolerances, …)?
Calibration and referencing of phase 2 collimators (knowledge of jaw positions and gap)?
SLAC prototype compatible with installed phase 2 infrastructure?
Cables to tunnel wall or up to collimator? Define plugs as interface?
Base supports (interface?) or just drilling holes into the concrete floor?
Water connection (interface)?
Alignment procedure?
SLAC design compatible with radiation constraints?
Activation levels much higher? Remote/fast handling features (quick-plugs)?
Materials OK?
RWA, 13/6/2005

7. News Most news has been reported at our video meetings.
Committed on a CERN collimation budget which was fully approved:
Includes all infrastructure for collimators in phases 1, 2 and 3.
Includes R&D and production of phase 1.
Includes R&D on radiation optimization (remote tools).
Includes R&D on a CERN phase 2 design with a prototype.
Does not include production of phase 2 collimators, foreseen to start in early 2009.
Full support in budget shows that CERN does not take any compromise on collimation and already now invests significant money on phase 2 infrastructure.
Much time in the project is now spent on trying to get series production of phase 1 collimators going  huge challenge.
Get ready for beam in 2007!
RWA, 13/6/2005

8. Just-In-Time Phase 1 Collimator Production as in Contract
Only 1 month at CERN for testing and equipping!
RWA, 13/6/2005