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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)
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. https://doi.org/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. https://doi.org/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. https://doi.org/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 referencing / citing this record:

    Studies of high order modes in asymmetric dual-axis cavity
    journal, December 2018

    • Topp-Mugglestone, M.; Konoplev, I. V.; Zhang, H.
    • Applied Physics Letters, Vol. 113, Issue 24
    • DOI: 10.1063/1.5060725

    A tunable source of coherent terahertz radiation driven by the microbunched electron beam
    journal, December 2019

    • Zhang, Huibo; Konoplev, Ivan; Doucas, George
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    • DOI: 10.1088/1361-6463/ab5d69