1. LARP Phase II Secondary Collimator RC-1
Collimator Development Status and Outlook
Revised 03/16/09
LARP LHC PHASE II COLL RC1 - S. Lundgren 16 Mar No 1 /15

2. Quick Review of SLAC Design Fabrication update Testing @ SLAC
Outline
Quick Review of SLAC Design
Fabrication update
SLAC
Proposed CERN
LARP LHC PHASE II COLL RC1 - S. Lundgren 16 Mar No 2 /15

3. Overview of SLAC Design
Jaw configuration
Recapping: the 2mm annular gap between the Shaft and Jaw allows the Jaw ends to bend away from the beam centerline under beam heat load.
End Support System improvements
High strength stainless steel simplifies assembly and “beefs up” the support.
Rotation/Gear Drive Mechanism detail
Gear Drive now a separate piece. Permits simpler image current foil configuration.
Robustness Test cylindrical tank
Large diameter flanged ends allow access to moving parts.
LARP LHC PHASE II COLL RC1 - S. Lundgren 16 Mar No 3 /15

4. Jaw End Support System
~100 1mm dia. ball bearings
in End adapter for rotation
(Bellows removed to show
support detail)
Jaw Shaft End rests in slot of Support and is held by jam nuts on either side
Flexible support is high
strength stainless steel
welded to bellows cuff
during bellows fab
Bellows mounting to Drive is unchanged from CERN design
Cooling tube adapter
is tig welded after Jaw
is installed in Tank
“Beefed-up” design still permits Jaw end-to-end offsets (3mm), Shaft thermal expansion and static sag. Deflection is improved for non-horizontal collimator positions.
LARP LHC PHASE II COLL RC1 - S. Lundgren 16 Mar No 4 /15

5. Cutaway of Jam Nut and Support
100 1mm dia. Ball bearings roll in “V” groove
Rotation Mechanism mounts
to tab on bearing race
Jam Nuts mate at beveled surfaces to strengthen tip of Support
LARP LHC PHASE II COLL RC1 - S. Lundgren 16 Mar No 5 /15

6. Up Beam End with Image Current Foil
Chain Tensioners
used to clamp DN250 flanges
to End Adapter
Tank End Adapter (not shown)
Beam centerline
Ratchet actuator
(not shown) mounts
to tank floor
Image Current Foil shadows
gear drive mechanisms
LARP LHC PHASE II COLL RC1 - S. Lundgren 16 Mar No 6 /15

7. 1st Glidcop Center Hub awaiting copper plating and a final grooving
Fabrication Update
1st Glidcop Center Hub awaiting
copper plating and a final grooving
step prior to brazing to the Half Shafts.
Is in shop queue.
Final Moly Half Shaft promised ship date is
March 27th.
Glidcop Jaw material promised ship date also March 27th.
Mandrel fabrication is progressing well…. See next slide!
LARP LHC PHASE II COLL RC1 - S. Lundgren 16 Mar No 7 /15

8. 1st RC-1 Mandrel Prep for Grooving
Mandrel and Al strong-back set-up for waxing
Rotation spreads lapidary wax
Strong-back was also heated and additional wax was added just prior to inserting into bore
When wax cools parts bond together
ensuring successful groove machining
Heat parts again to separate.
Link to complete set of photos:
LARP LHC PHASE II COLL RC1 - S. Lundgren 16 Mar No 8 /15

9. Grooving in work X,Y & Z axes 4th or “B” axis rotates
LARP LHC PHASE II COLL RC1 - S. Lundgren 16 Mar No 9 /15

10. RC-1 and Robustness Test Drawing Status
Still a ways to go:
End Support and Bellows assembly fabrication
drawings in work now.
Robustness Test Tank Assembly fabrication
drawings planned for April and May.
LARP LHC PHASE II COLL RC1 - S. Lundgren 16 Mar No 10 /15

11. RC-1 Near Term Plans
The 2 Mandrels needed for the LHC Test Assembly will
be released for quote after successful machining
on 1st Mandrel.
1st Mandrel/Coil Assembly is planned for winding in April
Brazing in May
Facet machining in June
LARP LHC PHASE II COLL RC1 - S. Lundgren 16 Mar No 11 /15

12. Drive Test Stand (CERN Drives)
1st RC-1 (when complete)
RC-0 (Heater Test Jaw)
Jaw and Support parts (plastic) are mocked up on the Drive Test Stand
LARP LHC PHASE II COLL RC1 - S. Lundgren 16 Mar No 12 /15

13. Additional RF resistance tests
Dummy Jaw End Assembly
Tests to be performed with 1mm dia rhodium plated ball bearings (in actual configuration) will define
the side load force needed for an acceptable resistance value. Perhaps the resultant force from the
Image current foil/strap transverse displacement would be adequate.
LARP LHC PHASE II COLL RC1 - S. Lundgren 16 Mar No 13 /15

14. Proposed TT60 Robustness Test Configuration
Preferred orientation is 0 degrees.
RC-0 & RC-1 Jaws are used.
Collimator mounts on CERN stand.
Cooling water quick connect?
Cables do not?
Laser micrometers mount here
for measuring possible permanent
distortion after beam strike
End ports are 1mm thick titanium.
Vacuum pump (if needed) mounts
to tee at down beam end.
Chain tensioners used on all flanges.
Cameras mount here (both ends)
for remote viewing surface damage
to RC-1 Jaw after beam strike
Beam
DN250 flanges at ends permit access prior
to test and after “cool-down period”
LARP LHC PHASE II COLL RC1 - S. Lundgren 16 Mar No 14 /15

15. Proposed LHC Test comments
Planned orientation is 90 degree but could be adapted to that required by lattice position selected for our test.
Flanged ends are still planned for access to image current and moving parts prior to LHC Test and after “cool-down” period.
Cooling water and control cables mount with quick connects.
Square OFE copper is planned for cooling tube for LHC.
a braze tests is planned using round tubing in a round bottom groove to qualify the configuration.
we have been unable to locate a vendor willing to provide the
square i.d. square o.d. configuration in Cu-Ni necessary for flow rate spec.
Final determination of Tank shape will be made once RF modeling results are in.
LARP LHC PHASE II COLL RC1 - S. Lundgren 16 Mar No 15 /15