• Open Access

Optimization of a traveling wave superconducting rf cavity for upgrading the International Linear Collider

V. Shemelin, H. Padamsee, and V. Yakovlev
Phys. Rev. Accel. Beams 25, 021001 – Published 7 February 2022

Abstract

The standing wave TESLA niobium-based superconducting radio frequency structure is limited to an accelerating gradient of about 50MV/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 considering experimentally known limiting electric and magnetic fields. It is shown that a TW structure can have an accelerating gradient above 70MeV/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 the TESLA structure that reduces the dynamic heat load by a factor of 2. A method is proposed how to make TW structures multipactor-free. Some design proposals are offered to facilitate fabrication. Further increase of the real-estate gradient (equivalent to 80MV/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 International Linear Collider energy upgrades beyond 1 to 3 TeV in competition with CLIC. The paper will discuss corresponding opportunities and challenges.

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  • Received 10 October 2021
  • Accepted 24 January 2022

DOI:https://doi.org/10.1103/PhysRevAccelBeams.25.021001

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Accelerators & Beams

Authors & Affiliations

V. Shemelin, H. Padamsee, and V. Yakovlev

  • FNAL, Batavia, Illinois 60510, USA

Article Text

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Issue

Vol. 25, Iss. 2 — February 2022

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