1. ColUSM #63 18 th September, 2015 D. Ramos, C. Mucher, L. Gentini, H. Prin, Q. Deliege, A. Bastard, J. Hrivnak

2. Click here to add footer 2 Maximising collimator length New end covers may be made to route the bus bars in a way to provide enough space for the collimator. The “price” is loss of interchangeability betwen cold masses… Retained Additional module needed to create a standard interconnect interface and thermal compensation. Interference with W sleeve. Not possible to fit the collimator nor sector valves between standard bus bar lines. New routing needed to make vertical space for the collimator

3. Click here to add footer 3 Unchanged cold mass length i.e. ~3.1 m availabe for collimator, interconnects and remainder equipment

4. Click here to add footer 4 Many ideas tested…

5. Click here to add footer 5 May 2014: Eureka! QRL side K2 M2 V2 W Y M1 M3 E C’ V1 K1 X N

6. Click here to add footer 6 Current baseline Same 15660 mm length between interconnect planes as an LHC MB Connection cryostat between two 11 T magnets to integrate the collimator LHC MB replaced by 3 cryostats + collimator, all independently supported and aligned: Same interfaces at the extremities: no changes to nearby magnets, standard interconnection procedures & tooling

7. Click here to add footer 7 Connection cryostat for collimator integration Cold mass enlarged to Ø750 on the collimator side Constant LHC arc outer flange diameter: Ø1055 Flexible interconnects for alignment independency and thermal contraction Busbar routing is now in the shadow of the beam screens and CWT!

8. Click here to add footer 8 Cross section of the connection cryostat and collimator Dedicated collimator design. One collimator design fits both beam lines M2 W Y M1 M3 E C’ X N Collimator supported directly on the concrete slab Larger cold mass extremity to open up space for the collimator

9. Click here to add footer 9 Beam vacuum options (A) Warm drift vacuum chamber Possibility of getting extra 50 mm but the interconnects will not have the same length: 2 vacuum vessel variants or 2 interc. sleeve variants Transitions needed to allow installation of sector valves Very tight integration

10. Click here to add footer 10 Beam vacuum options (B) Interconnects become longer because of the beamscreens Very compact cold line because of the sector valve RF shielding Transitions avoided because there are no sector valves on the other beam lines Cold drift vacuum chamber Vacuum group opts for cold line: “simpler” system, no failure prone sector valves

11. Click here to add footer 11 60 cm collimator length baseline

12. Click here to add footer 12 11 T Prototype: procurement process on-going

13. Click here to add footer 13 Detailed design of bypass is on-going

14. Click here to add footer 14 Conclusion The concept has evolved to a sound design for integration of a 60 cm collimator without compromises to other systems (vacuum, cryogenics, powering, RF…) All interfaces are understood Procurement of the MBH prototype cryostat is on-going Final design details on the bypass cryostat being adressed