Enhancing Electron Beam Radiative Energy Extraction Efficiency in Free-Electron Laser Oscillators Through Beam Energy Ramping

Marks, H. S. and Lurie, Yu and Dyunin, E. and Gover, A. (2017) Enhancing Electron Beam Radiative Energy Extraction Efficiency in Free-Electron Laser Oscillators Through Beam Energy Ramping. IEEE Transactions on Microwave Theory and Techniques, 65 (11). pp. 4218-4224. ISSN 0018-9480

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Abstract

Free-electron lasers are used to generate laser radiation using an accelerated electron beam. In this paper, an electrostatic accelerator was used with a thermionic cathode. Lasing pulses of the order of tens of microseconds were generated by passing the current pulses through a wiggler and resonator combination. The change in lasing power as a result of postsaturation variation of the energy of the electron beam during the lasing period is presented in this paper in the form of experimental measurements and simulations. In the experiments, the initial electron beam energy was similar to 1.4 MeV and the current was 1.13 A, whilst the lasing frequency was always close to 102 GHz. It is shown that postsaturation, positively ramping the beam energy increases the radiation extraction efficiency by around 50%. Whilst a falling beam energy results in a reduction in extraction efficiency.

Item Type:
Journal Article
Journal or Publication Title:
IEEE Transactions on Microwave Theory and Techniques
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3108
Subjects:
ID Code:
146265
Deposited By:
Deposited On:
03 Sep 2020 09:00
Refereed?:
Yes
Published?:
Published
Last Modified:
24 Nov 2020 08:48