Study of the beam profile and position instability of a post-accelerated pseudospark-sourced electron beam
Zhao, J. and Yin, H. and Zhang, L. and Shu, G. and He, W. and Phelps, A. D. R. and Cross, A. W. and Pang, L. and Zhang, Q. (2017) Study of the beam profile and position instability of a post-accelerated pseudospark-sourced electron beam. Physics of Plasmas, 24 (3). 033118. ISSN 1070-664X (In Press) (https://doi.org/10.1063/1.4978788)
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Abstract
A pseudospark-sourced electron beam is a promising candidate for driving a THz millimeter wave radiation source. However, the physics governing the electron beam density profile and the beam center deviation from the axis of the structure, which may be caused by the randomness in the pseudospark discharge process, remains still unclear especially for the high energy component of the pseudospark-sourced electron beam which is usually non-mono-energetic. It is essential to study the electron beam density profile and the beam center position distribution for optimizing the pseudospark discharge configuration. In this paper, images of some single-shot electron beam pulses have been captured using a 50 μm thickness stopping copper foil and a phosphor screen coated with P47 scintillator to study the electron beam density profile and the beam center position distribution of the high energy component of the electron beam. The experiments have been carried out on two pseudospark discharge configurations with two different size hollow cathode cavities. The influence of the cathode aperture of each configuration has also been studied according to the beam images. Experimental results show that the beam profile of the high energy component has a Lorentzian distribution and is much smaller than the axial aperture size with the beam centers dispersing within a certain range around the axis of the discharge structure. The pseudospark-sourced electron beam with the larger hollow cathode cavity shows smaller full width at half maximum (FWHM) radius and a more concentrated beam center distribution.
ORCID iDs
Zhao, J., Yin, H. ORCID: https://orcid.org/0000-0002-6635-9759, Zhang, L. ORCID: https://orcid.org/0000-0002-6317-0395, Shu, G., He, W. ORCID: https://orcid.org/0000-0001-7018-0527, Phelps, A. D. R. ORCID: https://orcid.org/0000-0002-1100-1012, Cross, A. W. ORCID: https://orcid.org/0000-0001-7672-1283, Pang, L. and Zhang, Q.;-
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Item type: Article ID code: 60089 Dates: DateEvent3 March 2017Published3 March 2017AcceptedNotes: The following article has been published by AIP and is available at http://aip.scitation.org/10.1063/1.4978788 Subjects: Science > Physics > Plasma physics. Ionized gases
Technology > Electrical engineering. Electronics Nuclear engineeringDepartment: Faculty of Science > Physics Depositing user: Pure Administrator Date deposited: 07 Mar 2017 11:36 Last modified: 01 Sep 2024 01:15 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/60089