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

Journal Article · · Physical Review Accelerators and Beams
 [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)
+ Show Author Affiliations
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.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1407121
Report Number(s):
FERMILAB-PUB--17-480-AD; 1631041
Journal Information:
Physical Review Accelerators and Beams, Journal Name: Physical Review Accelerators and Beams Journal Issue: 10 Vol. 20; ISSN 2469-9888; ISSN PRABCJ
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Studies of high order modes in asymmetric dual-axis cavity journal December 2018
A tunable source of coherent terahertz radiation driven by the microbunched electron beam journal December 2019

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