1. LARP Rotatable Collimators for LHC Phase II Collimation
US LHC Accelerator Research Program
BNL - FNAL- LBNL - SLAC
LARP Rotatable Collimators for LHC Phase II Collimation
18 December 2006
SLAC R&D Status Meeting
Gene Anzalone, Eric Doyle, Lew Keller, Steve Lundgren, & Tom Markiewicz

2. LHC Phase II Collimator Engineering-I
Braze Test #1
Section Braze Test #1
SLAC R&D Mtg December 2006
LHC Rotatable Phase II Collimators

3. LHC Phase II Collimator Engineering-II
200mm Al Mandrel for Coil Winding & CNC Mill Tests
Coil Winding Fixture
200mm Cu mandrel w/ coil after brazing
Cu ¼-round jaw section before braze to coil/mandrel
SLAC R&D Mtg December 2006
LHC Rotatable Phase II Collimators

4. LHC Phase II Collimator Engineering-II
1m winding tooling
Full Length Moly Shaft
Mill vise as precision bender
SLAC R&D Mtg December 2006
LHC Rotatable Phase II Collimators

5. Short Braze Tests prior to full length jaw
Braze Test #2 Immediate schedule
200mm mandrel machined for the braze wire groove and the OD reduced (~0.4mm diameter) to eliminate tubing distortions.
QC department measured the 4 Quarter Jaw IDs and the Test Mandrel and determined modifications to the Jaws are necessary.
Jaw inner surface modified by shop
Klystron Braze Shop will then braze the 4 jaws on 200mm long Assy
Promise completion date 12/19/06: in furnace now
Assembly will then be sectioned for braze joint inspection.
Braze test #3 planned: A second 200mm long Copper mandrel will be fabricated for more Jaw braze technique development and winding practice before the full size 9050mm Heater Test Mandrel is attempted
Molybdenum to copper braze tests are in the planning stages
SLAC R&D Mtg December 2006
LHC Rotatable Phase II Collimators

6. Single Jaw Thermal Test Hardware Progress
Clean Tent infrastructure upgrades nearing completion.
Electricians have installed ~half required conduit
SOC contacted. Told to get blessings of Earthquake, ES&H, High Energy Experimental and Electrical Safety Committees
Molybdenum Shaft completed and in house on 11/28/2006
Jaw 1/4 sections qty 22 released to vendor (includes 2 spares and 4 for additional Short Mandrel Tests)
Late January anticipated
Improved/Revised Mandrel design released to vendor for fabrication
Mid January date promised
SLAC R&D Mtg December 2006
LHC Rotatable Phase II Collimators

7. Other Tests & Design Work for 1st Jaw
Coil Tests
Bend 10mm sq. OD/ 7mm sq. ID copper samples into design configurations to check for distortions (internal and external)
Samples are being fabricated from 11mm sq. CDA101 conductor
Interested in knowing how much the tube deforms inward (relative to Mandrel OD) as a result of winding
If deformation is unacceptable may need to bulge it back out by over-pressurizing the tube after brazing
Twist tests
Twist a few samples to failure for a measure of the margin of safety and to determine actual torque required
Detail design work on
Collimator End Supports and Bellows Assy
Prototype “Rotator” design for proof-of-concept testing
U-Joint for initial deflection tests
Fabrication of appropriate CERN hardware
Drawing Trees and Lists for this are in work
SLAC R&D Mtg December 2006
LHC Rotatable Phase II Collimators

8. Upstream end vertical section
1mm jaw-shaft expansion gap
Jaw
Geneva Mechanism
Worm Gear
Shaft
Water Cooling
Channel
U-Joint Axle
Support Bearings
SLAC R&D Mtg December 2006
LHC Rotatable Phase II Collimators

9. Image Current Plate with RF Contacts
SLAC R&D Mtg December 2006
LHC Rotatable Phase II Collimators

10. LHC Rotatable Phase II Collimators
RF Contacts at Jaw Ends
SLAC R&D Mtg December 2006
LHC Rotatable Phase II Collimators

11. Longitudinal Contact Options
Top and Bottom are
CERN existing design
Alternate Options also use
CERN contacts
Favorite Option
uses Omega Co. contacts
SLAC R&D Mtg December 2006
LHC Rotatable Phase II Collimators

12. LHC Rotatable Phase II Collimators
Inside detail
Possible Option ?
SLAC R&D Mtg December 2006
LHC Rotatable Phase II Collimators

13. LHC Rotatable Phase II Collimators
Beam tests in (??)
Beginning to think about a Dummy Collimator for use in beam tests in 2007/2008 before final prototype is delivered for damage tests:
no rotation
no cooling
one jaw
2 jaw steppers
For impedence tests:
2 Jaws
4 steppers
Image Current Plate with RF springs
no water cooling ???
What tests are really possible in 2007?
Should we be preparing this hardware?
SLAC R&D Mtg December 2006
LHC Rotatable Phase II Collimators

14. LARP Collimator Delivery Schedule
Done
Braze test #1 (short piece) & coil winding procedures/hardware
Finish Braze test #2 (200mm Cu)
Braze test #3 (200mm Cu – apply lessons learned)
Fab/braze 950mm shaft, mandrel, coil & jaw pieces
Prep heaters, chillers, measurement sensors & fixtures, DAQ & lab
1st full length jaw ready for thermal tests
Fab 2nd 950mm jaw as above with final materials (Glidcop) and equip with bearings, rotation mechanism, end supports, rf features, cooling features, motors, etc.
Modify 1st jaw or fab a 3rd jaw identical to 2nd jaw, as above
Mount 2 jaws in vacuum vessel with external alignment features
2 full length jaws with full motion control in vacuum tank available for mechanical & vacuum tests in all orientations (“RC1”)
Modify RC1 as required to meet requirements
Final prototype (“RC2”) fully operational with final materials, LHC control system-compatible, prototype shipped to CERN to beam test
SLAC R&D Mtg December 2006
LHC Rotatable Phase II Collimators