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LHC Crab Cavities – some outcomes from the Chicago meeting in December 2013

LHC Crab Cavities – some outcomes from the Chicago meeting in December 2013. Ofelia Capatina. General. https:// indico.cern.ch/conferenceOtherViews.py?confId=136807&view=standard. Helium tank and Tuner concepts. 4-ROD. Helium tank and Tuner concepts. RF Dipole.

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LHC Crab Cavities – some outcomes from the Chicago meeting in December 2013

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  1. LHC Crab Cavities – some outcomes from the Chicago meeting in December 2013 Ofelia Capatina CCTC #4

  2. General • https://indico.cern.ch/conferenceOtherViews.py?confId=136807&view=standard CCTC #4

  3. Helium tank and Tuner concepts • 4-ROD CCTC #4

  4. Helium tank and Tuner concepts • RF Dipole CCTC #4

  5. Helium tank and Tuner concepts • QWR CCTC #4

  6. 4K GHe RETURN Design Approach – CryomoduleSchematic 2K (GHe) RETURN 4K (LHe) SUPPLY 40 K FORWARD ShrikantPattalwar 60 K RETURN 2K HEX and a valve box could be a part of the module ?? 4K PRE-COOL THERMAL SHIELD 40K TO 60K Outer Vacuum Chamber Magnetic shield TWO PHASE LINE 5K THERMAL INTERCEPTS Shrikant Pattalwar Hi-Lumi Crab Cavity Engineering Meeting Dec 13-14, 2012 Fermi Lab LHC Crab Cavity Cryostat, 14 Dec 2012

  7. Design Approach – Conceptual Model ShrikantPattalwar 1000mm 2160mm 420mm 413mm 1000mm 194 mm Triple tube cavity support system RF input coupler Low order mode coupler High order mode coupler SPS by-pass line Shrikant Pattalwar Hi-Lumi Crab Cavity Engineering Meeting Dec 13-14, 2012 Fermi Lab LHC Crab Cavity Cryostat, 14 Dec 2012

  8. Basic choices at Chicago • SPS test imposes already many constraints in itself - concepts for equipped cavities may be different between LHC and SPS • Some basic choices done for SPS tests during this workshop • 2 (identical) cavities in a cryomodule • 3 different cryomodules • FPC recommended (not an obligation) from the top and vertical of the cavity (62 mm OD) – see Eric’s talk • All cryo interfaces from top • 40 liters helium recommended; max. 100 liters – however helium inventory will not be a stopping point CCTC #4

  9. Basic choices at Chicago • SPS test • Available space requirement • Beam pipe distance 500 mm • Is tests at 4.5 K is not the baseline but could remain a posibility • Design for 2 K • Check design for 4.5 K also • Yes we keep the dummy beam pipe at 194mm CCTC #4

  10. Tuning • Tuning ranges • Operation frequencies and detuning • 60 kHz – slow tuning • 1.5 kHz – fast (de)tuning • Δf induced by Lorentz detuning and operating pressure • Ensure stability / pressure fluctuation for 400Hz BW Fast and slow TBD Cavity specific CCTC #4

  11. Helium tank • Helium tank • Tank material not imposed; however titanium involves • More complex interfaces • Not covered by the Harmonised European Standards => might require additional test • Stainless steel flanges for beam pipe interface • Interfaces to be harmonized in cryomodule – seems to go away more and more => dedicated cryomodule for each cavity CCTC #4

  12. Helium tank • We can use the adjacent beam pipe to reinforce cavity • We can have the adjacent beam pipe in the liquid helium CCTC #4

  13. Common boundary conditions will be formalized in January 2013 • Next common discussion in February 2013 CCTC #4

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