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Advances in Cavity Technology and Cryomodule Integration for High-Luminosity LHC

This summary presents key developments from the CC10 sessions focused on cavity technology and cryomodule integration relevant to the High-Luminosity Large Hadron Collider (HL-LHC) project. Topics include innovative designs for crab cavities, advancements in coupler concepts, thermal and mechanical analyses, and proposed R&D strategies. Contributions were made by prominent researchers discussing compact cavity designs, tuning mechanisms, and detailed analysis of mechanical tolerances. The session aimed at consolidating advances towards practical prototypes and readiness for Milestone 1 testing.

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Advances in Cavity Technology and Cryomodule Integration for High-Luminosity LHC

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  1. LHC CC10 Summary of Sessions on Cavity Technology and Cryomodule and Integration E. Ciapala CC10 - Summary Cavity Technology and Cryomodule

  2. Cavity Technology and Cryomodule Sessions • ICFA Deflecting Cavity Workshop (AlirezaNassiri) • EuCARD Cavity Developments (Graeme Burt) • LARP Cavity Developments (Zenghai Li) • ODU/JLAB Cavity Developments (Jean Delayen) • KEK Cavity Developments (Kenji Hosoyama) • Quarter wave resonator as a Crab Cavity (Ilan Ben-ZVI) • Slim Elliptical Cavity (Luca Ficcadenti) • Coupler Concepts for Compact Cavities (Wolfgang Weingarten) • Thermal & Mechanical analysis for CCs (Vittorio Parma) • Tuner Concepts for Crab Cavities (AlirezaNassiri) • = > Progress on moving towards realizing CCs, ancilliaries and their cryostat. CC10 - Summary Cavity Technology and Cryomodule

  3. Proposed Strategy for Crab Cavities CC09 • Main Goal : Compact Crab Cavities for LHC Local Scheme • CC09 workshop recommendation: • ! Future R&D focus should be on compact cavities which are suitable for both schemes. • Complete conceptual designs of the main candidates • Down-select to at least two designs, with full spec. and mechanical drawings of the cavities. Conceptual designs for tuner and He tank, the SOM,HOM and LOM coupler and the cryostat • Hardware prototyping and test on above, tooling, construction of prototype bare cavities prototypes, surface treatments and tests to confirm gradient and performance CC10 - Summary Cavity Technology and Cryomodule

  4. Crab Cavities for HL-LHC – Tentative Plan Overall schedule of the crab cavity project synchronized with the expected LHC operation schedule and the HL-LHC project proposal. v v v v v v v

  5. Cryostat and Ancilliaries • Couplers – see later • Tuners – Basic concepts reviewed, not ready to specify design.. • Cryostat layout (V. Parma)LHC… CC10 - Summary Cavity Technology and Cryomodule

  6. Cavity in He Tank – V. Parma LHC IR 1,5 constraints Baseline for Local CC: Second beam INSIDE the He tank! Global as LHC... 194mm 110 mm ~ 84 mm • Typical envelope (2 cavity one cryo-module), strongly depends on choice of cavity 0.8-1 m 2.5-3 m

  7. Summary cavity Technology and Cryomodule Cavities and Technology

  8. Four Rod CC (Cockroft) LHC-CC10, 4th LHC Crab Cavity Workshop CERN Geneva - W. Weingarten

  9. 236 mm 286 mm 4-Rod Final(ish) Cavity Design 408 mm

  10. Half Wave Spoke Resonator (SLAC) LHC-CC10, 4th LHC Crab Cavity Workshop CERN Geneva - W. Weingarten

  11. 400 MHz HWSR Cavity Parameters

  12. Parallel Bar TEM Cavity (UDU/JLAB) LHC-CC10, 4th LHC Crab Cavity Workshop CERN Geneva - W. Weingarten

  13. Parallel Bar Cavity – new optimized design

  14. Kota Compact Crab cavity (KEK) LHC-CC10, 4th LHC Crab Cavity Workshop CERN Geneva - W. Weingarten

  15. Quarter Wave Resonator as a Crab Cavity • The QWR is a simple, ultra-compact and efficient crab cavity. • An enormous advantage is the outstanding separation of the unwanted modes. • A small disadvantage is the acceleration imparted to the beam, however this is very small. • It fits with both beam line cavities side-by-side! Beam axis Axis of symmetry

  16. 800-MHz CRAB Cavity Technical space for He tank, etc.. OtherOM coupler WM coupler LHC pipe1 LHC pipe2 Vertical Deflecting Force 145 mm 194 mm • Cavity design fits both GLOBAL and LOCAL schemes • Surface field and RF parameters optimized • Other Order Mode Coupler to be optimized • Working Mode Coupler optimized • Preliminary Multipacting analysis performed

  17. CC Designs – Session Goals • Status of design & developments • Detailed cavity coupler design, deflecting mode characteristics • HOM spectra and achievable damping • Coupler configurations • Mechanical tolerances • Multipactor • Tuning concepts • Cavity fabrication, treatment, • Assembly of couplers • He vessel, Ancilliary equipment • Non linearity of deflecting voltage with transverse displacement • Have reached the stage where there is no fundamental show stopper for embarking on first hardware prototypes

  18. Conclusions • • Three CC design presented, they have reached initial design specifications • Good progress made since CC09. • Engineering designs advanced or complete • For all, plans exist on how to to reach HL-LHC Milestone 1 of bare cavity test and validation • We are ready for prototyping • The designs of cryomodules and ancilliaries will continue in order to be finalized for Milestone 1 • Open Issues: • Precise impedance budget for beam stability with current of baseline of 8 cavities/beam • Dynamic failures (multipacting and fast quenches) to be experimentally verified • Should we aim for early construction of a full prototype CC for a test in the SPS ? CC10 - Summary Cavity Technology and Cryomodule

  19. Summary cavity Technology and Cryomodule Thanks to all the speakers in these two sessions

  20. Tuners – A. Nassiri

  21. Coupler Concepts – W. Weingarten CC10 - Summary Cavity Technology and Cryomodule

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