Study of the beam profile and position instability of a post-accelerated pseudospark-sourced electron beam

J. Zhao, H. Yin, L. Zhang, G. Shu, W. He, A. D. R. Phelps, A. W. Cross, L. Pang, Q. Zhang

Research output: Contribution to journalArticle

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.
LanguageEnglish
Article number033118
Number of pages5
JournalPhysics of Plasmas
Volume24
Issue number3
DOIs
Publication statusAccepted/In press - 3 Mar 2017

Fingerprint

Electron beams
electron beams
profiles
Cathodes
hollow cathodes
Phosphors
configurations
apertures
cavities
dispersing
Full width at half maximum
radiation sources
stopping
Millimeter waves
millimeter waves
Metal foil
scintillation counters
shot
phosphors
energy

Keywords

  • pseudospark-sourced electron beam
  • electron beam density
  • pseudospark discharge
  • beam profile

Cite this

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title = "Study of the beam profile and position instability of a post-accelerated pseudospark-sourced electron beam",
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.",
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author = "J. Zhao and H. Yin and L. Zhang and G. Shu and W. He and Phelps, {A. D. R.} and Cross, {A. W.} and L. Pang and Q. Zhang",
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Study of the beam profile and position instability of a post-accelerated pseudospark-sourced electron beam. / Zhao, J.; Yin, H.; Zhang, L.; Shu, G.; He, W.; Phelps, A. D. R.; Cross, A. W.; Pang, L.; Zhang, Q.

In: Physics of Plasmas, Vol. 24, No. 3, 033118, 03.03.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Study of the beam profile and position instability of a post-accelerated pseudospark-sourced electron beam

AU - Zhao, J.

AU - Yin, H.

AU - Zhang, L.

AU - Shu, G.

AU - He, W.

AU - Phelps, A. D. R.

AU - Cross, A. W.

AU - Pang, L.

AU - Zhang, Q.

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PY - 2017/3/3

Y1 - 2017/3/3

N2 - 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.

AB - 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.

KW - pseudospark-sourced electron beam

KW - electron beam density

KW - pseudospark discharge

KW - beam profile

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JO - Physics of Plasmas

T2 - Physics of Plasmas

JF - Physics of Plasmas

SN - 1070-664X

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