Cryomodule for 4 Rod Crab Cavity Shrikant Pattalwar

Cryomodule for 4 -Rod Crab Cavity Shrikant Pattalwar Accelerator Science and Technology Centre STFC Daresbury Laboratory, UK CC 13 - CERN The Hi. Lumi LHC Design Study (a sub-system of HL-LHC) is co-funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404.

Acknowledgements STFC Tom Jones, Niklas Templeton, Andrew May, Peter Mc. Intosh, Alan Wheelhouse, Philippe Goudket ULAN Graeme Burt, Ben Hall CERN Ofelia Capatina, Krzysztof Brodzinski, Rama Calaga, Alick Macpherson, Luis Alberty, Thierry Renaglia, Eric Montesinos and many others… FNAL Tom Peterson and Tom Nichols Hi. Lumi WP 4 collaboration including the members of US-LARP Shrikant Pattalwar CC 13 CERN DEC 9 -10, 2013 2

Contents Cryomodule for 4 -Rod Crab Cavity • Design Overview • Thermal Management • Future Plans • Summary Shrikant Pattalwar CC 13 CERN DEC 9 -10, 2013 3

Helium Vessel UK 4 -Rod Cavity in He Vessel Parts of the Vessel LHC (dummy) beam pipe SPS beam pipe Saclay-II type tuner More details by Thomas Jones in this workshop Shrikant Pattalwar CC 13 CERN DEC 9 -10, 2013 4

Cryomodule Concept December 2012 1520 mm 2150 mm August 2013 800 mm Design Approach Provide sufficient and easy access to internal components during assembly and after installation More details in - Conceptual design of a Cryomodule for Crab Cavities for Hi. Lumi-LHC S. Pattalwar, et al, MOP 087, SRF 2013, Paris Shrikant Pattalwar CC 13 CERN DEC 9 -10, 2013 5

Fully Assembled Cavity String (4 R) 2 Phase He line OVC to coupler ISO K 500 spool pieces LHe level probes Top fill LHe line Bottom fill LHe line Cryoperm magnetic shields Tuners Motor magnetic shield Pipework for liquid nitrogen connections Thermometry and wiring for entire string Shrikant Pattalwar CC 13 CERN DEC 9 -10, 2013 6

Basic Assembly Sequence 1. Clean Room Operations • Assemble cavity string • Couplers assembled at 90 o • Beam pipe closed with gate Valves 4. Align the string with the outer tube adjustment system and a laser tracker. 2. Outside the clean Room • Load the cavity String from Side 3. Lift and assemble using sliding frame, or lower Outer Vacuum Chamber Shrikant Pattalwar CC 13 CERN DEC 9 -10, 2013 7

Final Assembly Mu Metal magnetic shield (blue). ISO K clamp 80 K thermal shield (green). 20 mm allocated for MLI 300 K 8 Shrikant Pattalwar CC 13 CERN DEC 9 -10, 2013

Compatibility with SPS Infrastructure Requirements Concept Design Shrikant Pattalwar CC 13 CERN DEC 9 -10, 2013 9

Cryomodule in SPS RF Input Cryo services Sliding support table Shrikant Pattalwar CC 13 CERN DEC 9 -10, 2013 10

Side Loaded Cryomodule - Key Features 1. Side Loading • Full and quick access to inside components in the installed position with beam line connected. • An important feature advantageous during prototyping for any modifications, leak checks accessing tuners, Installing additional diagnostics • Simplifies Assembly process Requires less tooling during assembly • Requires less vertical height or longitudinal space during assembly • Less expensive Proposal by Ofelia Capatina et al Key Features 2. FPC to function as cavity Support • Input RF Coupler (fixed point) also functions as support for the dressed cavity • XYZ stage added at the top for alignment Shrikant Pattalwar CC 13 CERN DEC 9 -10, 2013 11

FEA for using Power Coupler as cavity support • • FEA has been performed to estimate the likely deformation of the structure caused by the combination of the following loads; • Atmospheric pressure (0. 1 MPa) • Mass of the cavity string (250 Kg in total) • Moment induced by off centre tuner (~100 Nm) The maximum deformation of the coupler outer wall is approximately 100μm, however, the position of the cavity string can be adjusted after pump down using the studding on the coupler. Max deformation 95μm Vertical deformation 85μm Maximum stress 84 MPa in stud. Minor diameter (6. 6 mm) of M 8 stud DEC used for 2013 analysis. Shrikant Pattalwar CC 13 CERN 9 -10, 12

Cryomodule Schematic (P&ID) Shrikant Pattalwar CC 13 CERN DEC 9 -10, 2013 13

Heat Load Estimates Is there a scope to reduce them? The main issue is not the limitation on the plant capacity but to match the duration of the operation with LHe inventory. Shrikant Pattalwar CC 13 CERN DEC 9 -10, 2013 14

Cooling with LN 2 80 K Circuit level probe • LN 2 phase separator ( ~ 5 lts ) inside or outside the CM • Active cooling with thermo siphon for H > 5 W Radiation Shield, FPC, LOM, … • Conduction cooling for H < 5 W LN 2 consumption Beam Pipe, Instrumentation cables , …. 3 l/hr Radiation Shield Top LN 2 Phase separator >5 W Total > 5 W < 2 W Radiation Shield bottom Isolation Chamber Shrikant Pattalwar CC 13 CERN DEC 9 -10, 2013 15

Cool down to 4 K LOM coupler OFF HOM coupler Input coupler LN 2 supply 2 K GHe return 2 K LHe supply 4 K LHe (precool) GN 2 return HOM coupler Input coupler ATM LP GHe return ON GHe LHe Beamline ATM Bottom filling during cool down 16/

Operation at 2 K ATM LOM coupler HOM coupler Input coupler ON LOM coupler LN 2 supply 2 K GHe return 2 K LHe supply 4 K LHe (precool) GN 2 return HOM coupler Input coupler LP GHe return OFF Bleeder path Beamline ATM 17/

Future Plan March 2014 Concept Design Manufacturing Engineering Design Acceptance Tests Commissioning Jan 2016 Graeme Burt Ben Hall + WP 4 collaborators Shrikant Pattalwar Tom Jones Niklas Templeton Andrew May Graeme Burt + CERN / LARP Shrikant Pattalwar CC 13 CERN DEC 9 -10, 2013 18

Summary Design Status - Some Top Level Issues Recommend to hold a special Brainstorm session on these issues Key No longer an issue Options identified Issues not understood clearly Shrikant Pattalwar CC 13 CERN DEC 9 -10, 2013 19

Thank You 20/