Abstract
We investigate the generation of high repetition frequency electron beam from vacuum arc plasma source, which consists of Cu cathode and hollow anode. The frequency and pulse width of the extraction pulse power supply based on MOSFET can be adjusted continuously. A self-trigger circuit is designed to immediately reignite DC arc after its extinguishment and guarantee the discharge duration time and stability. The experimental results show that the repletion frequency and pulse width of the electron beam are controlled by the extraction pulse voltage parameters. With a certain discharge current, the beam current increases with the increasing extraction voltage and shows a saturation limit up to 1A. However, the extraction voltage with too high pulse frequency or pulse width is not conducive to the stability of the beam current.
Highlights
A wide variety of devices have been designed to produce electron beams, each suited for different purposes such as vacuum coating, welding, and high power microwave.1–3 With conventional electron sources are thermionic4–6 and field emitters,7,8 they require high vacuum conditions to minimize damage from ion bombardment and chemical erosion, and to maximize lifetime
We developed a new type of hollow anode plasma cathode with cage structure and obtained a single pulse electron beam with current of 2.3A and pulse width of 45ms by electrostatic focusing with no magnetic field guiding
The increase of the repetition frequency or pulse width will increase the total amount of the electrons extracted in unit time from the arc plasma
Summary
A wide variety of devices have been designed to produce electron beams, each suited for different purposes such as vacuum coating, welding, and high power microwave. With conventional electron sources are thermionic and field emitters, they require high vacuum conditions to minimize damage from ion bombardment and chemical erosion, and to maximize lifetime. The second design employs a hollow anode structure as a hollow cylinder, and the electron beam is extracted from the discharge plasma through the acceleration grid Both of them are capable of generating high density, high current and long length pulse electron beam. G. et al obtained a plasma column with a volume of more than 1m3 and density up to 1010∼1013cm-3 by low-pressure vacuum arc discharge based on a hollow cathode structure, in which the extracted pulsed electron beam current can be up to tens of amperes.. Based on the above research, in this study, we design an extraction power supply with DSP as the control core and MOSFET as the power components This efficient design successfully extracts a high repetition frequency electron beam of ampere magnitude with flexible repetition frequency and pulse width from small current vacuum arc plasma cathode. Combined with the discharge process and mechanism in the device, the experimental results are discussed and explained
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