High power, high brightness electron beam generation in a pulse-line driven pseudospark discharge

Destler, W.W.; Segalov, Z.; Rodgers, J.; Ramaswamy, K.; Reiser, M.

doi:10.1063/1.109591

Cited by 37 publications

(10 citation statements)

References 7 publications

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“…A characteristic feature of this type of discharge is the generation of distinctive electron beams, before and at the time of voltage collapse [7][8][9][10]. These high-power high-brightness electron beams [11] were successfully tested for applications such as thin-film deposition, plasma processing, intense pulsed charged particle sources, and X-ray sources [12]. The processes leading to beam generation are not completely understood, although it is known that they are related to plasma formation in the low E/N (the reduced electric field) region inside the hollow cathode region (HCR) [13,14].…”

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confidence: 98%

Experimental Analysis of Pseudospark Sourced Electron Beam

Kumar

Pal

Verma

et al. 2011

J Infrared Milli Terahz Waves

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The pseudospark (PS) discharge has been shown to be a promising source of high brightness, high intensity electron beam pulses. The PS discharge sourced electron beam has potential applications in plasma filled microwave sources where normal material cathode cannot be used. Analysis of the electron beam profile has been done experimentally for different applied voltages. The investigation has been carried out at different axial and radial location inside the drift space in argon atmosphere. This paper represents experimentally found axial and radial variation of the beam current inside the drift tube of PS discharge based plasma cathode electron (PCE) gun. With the help of current density estimation the focusing and defocusing point of electron beam in axial direction can be analyzed.

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confidence: 98%

Experimental Analysis of Pseudospark Sourced Electron Beam

Kumar

Pal

Verma

et al. 2011

J Infrared Milli Terahz Waves

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“…A clear distinction between these kind of electron beams and classical electron sources based on thermoionic or field emission has to be made. These high-power high-brightness beams [2] were successfully tested for applications such as thin-film deposition, plasma processing, intense pulsed charged particle sources, and X-ray sources [1].…”

Section: Introductionmentioning

confidence: 99%

Comparative studies on intense electron beams generated in transient hollow-cathode discharges

Dewald

Frank

Hoffmann

et al. 2002

IEEE Trans. Plasma Sci.

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For a large range of pulsed power applications, intense pulsed electron beams with 0.1-2-mm diameter, power densities of about 10 9 W/cm 2 , peak currents in the 50 to 1000 A range, and electron energies up to several tens of kiloelectronvolts are generated in high voltage (5-30 kV) transient hollow cathode discharges (THCD). The most efficient THCD configurations for generating such electron beams are the pseudospark, the channel spark, and preionization-controlled open-ended hollow-cathode configurations, which differ from each other by the tube geometry and the typical working gas pressure (0.5-500 Pa). The beam parameters, such as current, pulse length, and electron energy are compared for all three configurations using the same diagnostics. The dependencies of these beam parameters on the discharge geometry, voltage, external capacitance, and gas pressure is discussed in these three configurations. Index Terms-Channel spark, electron beams, preionization-controlled open-ended hollow-cathode (PCOHC), pseudospark.

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“…Only the high energy component of the electron beam can interact with the electromagnetic wave to generate high frequency radiation. Destler found the diameter of the high energy 200keV part of the electron beam was in the range of 0.2 to 1.4 mm using a copper stopping foil and heat sensitive polycarbonate sheet 14 . Zhu found electron beam damage patterns on acid-sensitive discoloring film and copper foil and then observed the damage holes had diameters in the 0.3 mm to 0.5 mm range 15 …”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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This version is available at https://strathprints.strath.ac.uk/60089/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. 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 m 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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High power, high brightness electron beam generation in a pulse-line driven pseudospark discharge

Cited by 37 publications

References 7 publications

Experimental Analysis of Pseudospark Sourced Electron Beam

Experimental Analysis of Pseudospark Sourced Electron Beam

Comparative studies on intense electron beams generated in transient hollow-cathode discharges

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

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