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This article presents the investigation of millimetre wave extended interaction oscillation (EIO) using both pencil and sheet-shaped pseudospark (PS)-sourced electron beams. A W-band (75–110 GHz) pencil beam Extended Interaction Oscillator (EIO) was designed and constructed to operate for the first experiment with the output power of 38 W achieved from a four-gap PS discharge operating at 30.5 kV...
This article presents the investigation of a millimetre-wave extended interaction oscillation using both pencil and sheet-shaped pseudospark (PS)-sourced electron beams. Two W-band (75–110 GHz) pencil and sheet beam extended interaction oscillators (EIO) were designed and constructed respectively. The PS-sourced pencil beam EIO structure was firstly driven by a four-gap PS discharge operating at 30...
This article presents the investigation of millimeter wave extended interaction oscillation using both pencil and sheet-shaped pseudospark (PS)-sourced electron beams. A W-band (75–110 GHz) pencil beam extended interaction oscillator (EIO) was designed and constructed. In the first experiment the output power of 38 W was achieved from a four-gap PS discharge operating at 30.5 kV. PS-sourced beam generation...
High quality intense electron beams play an important role in high power millimeter-wave and terahertz radiation generation. To this end, the pseudospark-sourced electron beam has been investigated with their applications in different beam-wave interaction structures. Different structures have been designed and modelled using the particle-in-cell codes MAGIC and CST Particle Studio. The experimental...
Pseudospark (PS) electron beams of outstanding performance have been studied recently with their application to a demanding field of millimeter-wave and terahertz radiation generation. To this end, the PS discharge process itself has been studied and millimeter wave sources which utilize a PS sourced electron beam in different beam-wave interaction structures have been designed and modelled using...
The pseudospark discharge is a form of low-pressure gas discharge capable of generating extremely high currents with short rise times by means of a unique hollow cathode structure [1-6]. A high-quality electron beam is generated during the later phases of the discharge process, which possesses high current density and brightness, as well as the ability to self-focus via ion channel focusing. This...
Millimeter-wave radiation has been successfully generated by a ∼100GHz BWO driven by a high brightness electron beam derived from a 14-gap pseudospark discharge. Pseudospark electron beams have been studied recently with their application to millimeter-wave and terahertz radiation generation. A BWO utilizing the interaction between an axial electron beam and a slow-wave structure was designed and...
Cold test results of a G-band sheet beam backward wave oscillator (BWO) with a double grating waveguide, fabricated by wire cutting and a 3D printing technique, are presented in this paper. The dispersion curve and S-parameters of the BWO slow wave circuit and Bragg reflector were measured and the results compared to the numerical modelling and analytical theory.
A small-scale pseudospark discharge is being investigated as the electron beam source for a klystron operating at a frequency of 94 GHz, and single-gap discharge experiments have been carried out. The klystron has been designed using the particle-in-cell (PiC) code MAGIC-2D and simulated output to date looks promising.
A small-scale pseudospark discharge is being investigated as the electron beam source for a klystron operating at a frequency of 94 GHz and single-gap discharge experiments have been carried out. The klystron has been designed using the particle-in-cell (PiC) code MAGIC-2D and simulated output looks promising.
The Terahertz band of EM spectrum has received considerable research interests recently. A micro-klystron has the potential to meet the requirement of high power and compact terahertz source in many applications. The micro-klystron needs a very thin electron beam with sufficient current density. A pseudospark discharge cathode has the ability to provide high current density with small diameter electron...
Summary form only given. Terahertz radiation, which ranges from 0.1 THz to 10 THz, has received substantial interests in recent years. The conventional vacuum electronics technology has the potential to supply high enough powers to underpin many exciting and emerging THz applications. Klystrons have been designed to generate THz radiation. This vacuum device requires a very small sized RF circuit...
Experimental studies of the production and propagation of an electron beam from a multi-gap pseudospark discharge chamber are presented. A beam up to 680 A was measured at the anode when a three-gap pseudospark underwent a breakdown at an applied DC voltage of 23 kV. This beam can propagate further downstream as far as 20 cm in length in a gaseous environment (pressure = 60 mtorr) with no guiding...
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