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Title: An L-Band Superconducting Traveling Wave Accelerating Structure With Feedback

The most severe problem of the International Linear Collider is its high cost, resulting in part from the enormous length of the collider. This length is determined mainly by the achievable accelerating gradient in the RF system of the ILC. In the ILC project the required accelerating gradient is higher than 30 MeV/m. Further improvement of the coupling to the beam may be achieved by using a Traveling Wave SC structure [1]. We have demonstrated that an additional gradient increase of up to 46% may be possible if a {pi}/2 TW SC structure is employed. However, a TW SC structure requires a SC feedback waveguide to return the few GW of circulating RF power from the structure output back to the structure input. The test cavity with feedback is designed to demonstrate the possibility of achieving a significantly higher gradient than existing SC structures. The double-coupler powering excitation and tuning have been studied numerically and the corresponding model results are presented. The proposed double-coupler powering scheme significantly reduces the tuning requirements as long as any of the partial modes of given magnitude and phase are excited independently, providing a clear traveling wave regime of structure operation.
Authors:
;  [1] ; ;  [2] ;  [3]
  1. Euclid Techlabs LLC, Solon, Ohio 44139 (United States)
  2. Fermi National Accelerator Laboratory, Batavia, IL 60510 (United States)
  3. High Energy Accelerator Research Organization, KEK, Tsukuba, Ibaraki 305-0801 (Japan)
Publication Date:
OSTI Identifier:
21255262
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1086; Journal Issue: 1; Conference: 13. advanced accelerator concepts workshop, Santa Cruz, CA (United States), 27 Jul - 2 Aug 2008; Other Information: DOI: 10.1063/1.3080948; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMPLIFIERS; EXCITATION; FEEDBACK; LINEAR COLLIDERS; MEV RANGE 10-100; OPERATION; RF SYSTEMS; SUPERCONDUCTIVITY; TRAVELLING WAVES; WAVEGUIDES