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

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4953204· OSTI ID:1557852
 [1];  [2];  [3];  [3];  [3];  [3];  [4];  [4];  [4]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Office of Scientific and Technical Information (OSTI)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Niowave, Inc., Lansing, MI (United States)
+ Show Author Affiliations

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 × 108, in agreement with prediction.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Grant/Contract Number:
SC0010075
OSTI ID:
1557852
Alternate ID(s):
OSTI ID: 1420586
OSTI ID: 22590734
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 22 Vol. 108; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (8)

Simulation of photonic band gaps in metal rod lattices for microwave applications journal February 2002
Raising gradient limitations in 2.1 GHz superconducting photonic band gap accelerator cavities journal June 2014
First High Power Test Results for 2.1 GHz Superconducting Photonic Band Gap Accelerator Cavities journal October 2012
Demonstration of a 17-GHz, High-Gradient Accelerator with a Photonic-Band-Gap Structure journal August 2005
Recirculating beam-breakup thresholds for polarized higher-order modes with optical coupling journal April 2007
Beam-breakup instability theory for energy recovery linacs journal May 2004
Investigations of Additional Losses in Superconducting Niobium Cavities Due to Frozen-In Flux journal January 1973
Superconducting Radio-Frequency Systems for High-β Particle Accelerators journal January 2012

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY