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Title: Experimental studies of 7-cell dual axis asymmetric cavity for energy recovery linac

Abstract

High average current, transportable energy recovery linacs (ERLs) can be very attractive tools for a number of applications including next generation high-luminosity, compact light sources. Conventional ERLs are based on an electron beam circulating through the same set of rf cavity cells. This leads to an accumulation of high-order modes inside the cavity cells, resulting in the development of a beam breakup (BBU) instability, unless the beam current is kept below the BBU start current. This limits the maximum current which can be transported through the ERL and hence the intensity of the photon beam generated. It has recently been proposed that splitting the accelerating and decelerating stages, tuning them separately and coupling them via a resonance coupler can increase the BBU start current. The paper presents the first experimental rf studies of a dual axis 7-cell asymmetric cavity and confirms the properties predicted by the theoretical model. The field structures of the symmetric and asymmetric modes are measured and good agreement with the numerical predictions is demonstrated. The operating mode field flatness was also measured and discussed. A novel approach based on the coupled mode (Fano-like) model has been developed for the description of the cavity eigenmode spectrum andmore » good agreement between analytical theory, numerical predictions and experimental data is shown. Finally, numerical and experimental results observed are analyzed, discussed and a good agreement between theory and experiment is demonstrated.« less

Authors:
 [1];  [1];  [1];  [2];  [3];  [1]
  1. Univ. of Oxford, Oxford (United Kingdom)
  2. Lancaster Univ., Lancaster (United Kingdom)
  3. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1407121
Report Number(s):
FERMILAB-PUB-17-480-AD
Journal ID: ISSN 2469-9888; PRABCJ; 1631041; TRN: US1703270
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 20; Journal Issue: 10; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Konoplev, Ivan V., Metodiev, K., Lancaster, A. J., Burt, G., Ainsworth, R., and Seryi, A. Experimental studies of 7-cell dual axis asymmetric cavity for energy recovery linac. United States: N. p., 2017. Web. doi:10.1103/PhysRevAccelBeams.20.103501.
Konoplev, Ivan V., Metodiev, K., Lancaster, A. J., Burt, G., Ainsworth, R., & Seryi, A. Experimental studies of 7-cell dual axis asymmetric cavity for energy recovery linac. United States. doi:10.1103/PhysRevAccelBeams.20.103501.
Konoplev, Ivan V., Metodiev, K., Lancaster, A. J., Burt, G., Ainsworth, R., and Seryi, A. Tue . "Experimental studies of 7-cell dual axis asymmetric cavity for energy recovery linac". United States. doi:10.1103/PhysRevAccelBeams.20.103501. https://www.osti.gov/servlets/purl/1407121.
@article{osti_1407121,
title = {Experimental studies of 7-cell dual axis asymmetric cavity for energy recovery linac},
author = {Konoplev, Ivan V. and Metodiev, K. and Lancaster, A. J. and Burt, G. and Ainsworth, R. and Seryi, A.},
abstractNote = {High average current, transportable energy recovery linacs (ERLs) can be very attractive tools for a number of applications including next generation high-luminosity, compact light sources. Conventional ERLs are based on an electron beam circulating through the same set of rf cavity cells. This leads to an accumulation of high-order modes inside the cavity cells, resulting in the development of a beam breakup (BBU) instability, unless the beam current is kept below the BBU start current. This limits the maximum current which can be transported through the ERL and hence the intensity of the photon beam generated. It has recently been proposed that splitting the accelerating and decelerating stages, tuning them separately and coupling them via a resonance coupler can increase the BBU start current. The paper presents the first experimental rf studies of a dual axis 7-cell asymmetric cavity and confirms the properties predicted by the theoretical model. The field structures of the symmetric and asymmetric modes are measured and good agreement with the numerical predictions is demonstrated. The operating mode field flatness was also measured and discussed. A novel approach based on the coupled mode (Fano-like) model has been developed for the description of the cavity eigenmode spectrum and good agreement between analytical theory, numerical predictions and experimental data is shown. Finally, numerical and experimental results observed are analyzed, discussed and a good agreement between theory and experiment is demonstrated.},
doi = {10.1103/PhysRevAccelBeams.20.103501},
journal = {Physical Review Accelerators and Beams},
number = 10,
volume = 20,
place = {United States},
year = {2017},
month = {10}
}

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Works referenced in this record:

High-power terahertz radiation from relativistic electrons
journal, November 2002

  • Carr, G. L.; Martin, Michael C.; McKinney, Wayne R.
  • Nature, Vol. 420, Issue 6912
  • DOI: 10.1038/nature01175

Effects of Configuration Interaction on Intensities and Phase Shifts
journal, December 1961


Asymmetric dual axis energy recovery linac for ultrahigh flux sources of coherent x-ray and THz radiation: Investigations towards its ultimate performance
journal, August 2016


Beam-breakup instability theory for energy recovery linacs
journal, May 2004

  • Hoffstaetter, Georg H.; Bazarov, Ivan V.
  • Physical Review Special Topics - Accelerators and Beams, Vol. 7, Issue 5
  • DOI: 10.1103/PhysRevSTAB.7.054401

THz imaging and sensing for security applications—explosives, weapons and drugs
journal, June 2005

  • Federici, John F.; Schulkin, Brian; Huang, Feng
  • Semiconductor Science and Technology, Vol. 20, Issue 7
  • DOI: 10.1088/0268-1242/20/7/018

Multiturn circulation of an energy-recovery linac beam in a storage ring
journal, March 2008


Cutting-edge terahertz technology
journal, February 2007


Magnetic-dipolar-mode Fano resonances for microwave spectroscopy of high absorption matter
journal, February 2015


Active terahertz metamaterial devices
journal, November 2006

  • Chen, Hou-Tong; Padilla, Willie J.; Zide, Joshua M. O.
  • Nature, Vol. 444, Issue 7119, p. 597-600
  • DOI: 10.1038/nature05343

Superconducting TESLA cavities
journal, September 2000

  • Aune, B.; Bandelmann, R.; Bloess, D.
  • Physical Review Special Topics - Accelerators and Beams, Vol. 3, Issue 9
  • DOI: 10.1103/PhysRevSTAB.3.092001

Measurement of resonant frequency and quality factor of microwave resonators: Comparison of methods
journal, September 1998

  • Petersan, Paul J.; Anlage, Steven M.
  • Journal of Applied Physics, Vol. 84, Issue 6
  • DOI: 10.1063/1.368498