Author: Shemelin, V.D.
Paper Title Page
WEOCAV04 Optimization of a Traveling Wave SRF Cavity for Upgrading the International Linear Collider 694
  • V.D. Shemelin
    Valery D Shemelin, Freeville, USA
  • H. Padamsee
    Cornell University, Ithaca, New York, USA
  • H. Padamsee, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  The Standing Wave TESLA Niobium-based structure is limited to a gradient of about 50 MV/m by the critical RF magnetic field. To break through this barrier, we explore the option of Niobium-based traveling wave (TW) structures. Optimization of TW structures was done taking into account experimentally known limiting electric and magnetic fields. It is shown that a TW structure can have an accelerating gradient above 70 MeV/m that is about 1.5 times higher than contemporary standing wave structures with the same critical magnetic field. The other benefit of TW structures shown is R/Q about 2 times higher than TESLA structure that reduces 2 times the dynamic heat load. A method is proposed how to make TW structures multipactor-free. Some design proposals can be realized to facilitate fabrication. Further increase of the real-estate gradient (equivalent to 80 MV/m active gradient) is also possible by increasing the length of the accelerating structure because of higher group velocity and cell-to-cell coupling. Realization of this work opens paths to ILC energy upgrades beyond 1 TeV to 3 TeV in competition with CLIC. The paper will discuss corresponding opportunities and challenges.  
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DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2021-WEOCAV04  
About • Received ※ 15 June 2021 — Accepted ※ 24 October 2021 — Issue date ※ 16 May 2022  
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