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Title: Cryogenic testing of the 2.1 GHz five-cell superconducting RF cavity with a photonic band gap coupler cell

Abstract

We present results from cryogenic tests of the multi-cell superconducting radio frequency (SRF) cavity with a photonic band gap (PBG) coupler cell. Achieving high average beam currents is particularly desirable for future light sources and particle colliders based on SRF energy-recovery-linacs (ERLs). Beam current in ERLs is limited by the beam break-up instability, caused by parasitic higher order modes (HOMs) interacting with the beam in accelerating cavities. A PBG cell incorporated in an accelerating cavity can reduce the negative effect of HOMs by providing a frequency selective damping mechanism, thus allowing significantly higher beam currents. The multi-cell cavity was designed and fabricated of niobium. Two cryogenic (vertical) tests were conducted. The high unloaded Q-factor was demonstrated at a temperature of 4.2 K at accelerating gradients up to 3 MV/m. The measured value of the unloaded Q-factor was 1.55 × 10{sup 8}, in agreement with prediction.

Authors:
 [1]; ; ; ;  [2]; ; ;  [3]
  1. Massachusetts Institute of Technology, 77 Mass. Ave., Cambridge, Massachusetts 02139 (United States)
  2. Los Alamos National Laboratory, PO Box 1663, Los Alamos, New Mexico 87545 (United States)
  3. Niowave, Inc., 1012 North Walnut Street, Lansing, Michigan 48906 (United States)
Publication Date:
OSTI Identifier:
22590734
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 22; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BEAM CURRENTS; CRYOGENICS; DAMPING; GHZ RANGE; INSTABILITY; LIGHT SOURCES; LINEAR ACCELERATORS; NIOBIUM; RADIOWAVE RADIATION; SUPERCONDUCTING CAVITY RESONATORS; TESTING

Citation Formats

Arsenyev, Sergey A., E-mail: arsenyev@mit.edu, Temkin, Richard J., Haynes, W. Brian, Shchegolkov, Dmitry Yu., Simakov, Evgenya I., Tajima, Tsuyoshi, Boulware, Chase H., Grimm, Terrence L., and Rogacki, Adam R. Cryogenic testing of the 2.1 GHz five-cell superconducting RF cavity with a photonic band gap coupler cell. United States: N. p., 2016. Web. doi:10.1063/1.4953204.
Arsenyev, Sergey A., E-mail: arsenyev@mit.edu, Temkin, Richard J., Haynes, W. Brian, Shchegolkov, Dmitry Yu., Simakov, Evgenya I., Tajima, Tsuyoshi, Boulware, Chase H., Grimm, Terrence L., & Rogacki, Adam R. Cryogenic testing of the 2.1 GHz five-cell superconducting RF cavity with a photonic band gap coupler cell. United States. https://doi.org/10.1063/1.4953204
Arsenyev, Sergey A., E-mail: arsenyev@mit.edu, Temkin, Richard J., Haynes, W. Brian, Shchegolkov, Dmitry Yu., Simakov, Evgenya I., Tajima, Tsuyoshi, Boulware, Chase H., Grimm, Terrence L., and Rogacki, Adam R. 2016. "Cryogenic testing of the 2.1 GHz five-cell superconducting RF cavity with a photonic band gap coupler cell". United States. https://doi.org/10.1063/1.4953204.
@article{osti_22590734,
title = {Cryogenic testing of the 2.1 GHz five-cell superconducting RF cavity with a photonic band gap coupler cell},
author = {Arsenyev, Sergey A., E-mail: arsenyev@mit.edu and Temkin, Richard J. and Haynes, W. Brian and Shchegolkov, Dmitry Yu. and Simakov, Evgenya I. and Tajima, Tsuyoshi and Boulware, Chase H. and Grimm, Terrence L. and Rogacki, Adam R.},
abstractNote = {We present results from cryogenic tests of the multi-cell superconducting radio frequency (SRF) cavity with a photonic band gap (PBG) coupler cell. Achieving high average beam currents is particularly desirable for future light sources and particle colliders based on SRF energy-recovery-linacs (ERLs). Beam current in ERLs is limited by the beam break-up instability, caused by parasitic higher order modes (HOMs) interacting with the beam in accelerating cavities. A PBG cell incorporated in an accelerating cavity can reduce the negative effect of HOMs by providing a frequency selective damping mechanism, thus allowing significantly higher beam currents. The multi-cell cavity was designed and fabricated of niobium. Two cryogenic (vertical) tests were conducted. The high unloaded Q-factor was demonstrated at a temperature of 4.2 K at accelerating gradients up to 3 MV/m. The measured value of the unloaded Q-factor was 1.55 × 10{sup 8}, in agreement with prediction.},
doi = {10.1063/1.4953204},
url = {https://www.osti.gov/biblio/22590734}, journal = {Applied Physics Letters},
issn = {0003-6951},
number = 22,
volume = 108,
place = {United States},
year = {Mon May 30 00:00:00 EDT 2016},
month = {Mon May 30 00:00:00 EDT 2016}
}