Impedance control method of the cylindrical virtual cathode reflex triode based on multi-ring cathode

Mengfan Zhang; Dingguo Lai; Qifu Xu; Mengtong Qiu

Plasma Science and Technology > 2025 > Accepted Manuscript

Mengfan Zhang, Dingguo Lai, Qifu Xu, Mengtong Qiu. Impedance control method of the cylindrical virtual cathode reflex triode based on multi-ring cathode[J]. Plasma Science and Technology.

Citation:

Mengfan Zhang, Dingguo Lai, Qifu Xu, Mengtong Qiu. Impedance control method of the cylindrical virtual cathode reflex triode based on multi-ring cathode[J]. Plasma Science and Technology.

Citation:

Mengfan Zhang, Dingguo Lai, Qifu Xu, Mengtong Qiu. Impedance control method of the cylindrical virtual cathode reflex triode based on multi-ring cathode[J]. Plasma Science and Technology.

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Impedance control method of the cylindrical virtual cathode reflex triode based on multi-ring cathode

State Key Laboratory of Intense Pulsed Radiation Simulation and Effect

More Information

Received Date: October 23, 2024
Revised Date: February 26, 2025
Accepted Date: March 02, 2025
Available Online: March 03, 2025

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Abstract

Abstract

The cylindrical virtual cathode reflex triode is a new type of pulsed hard X-ray load, which has the advantages of simple structure, high radiation conversion efficiency, and simplicity in series-parallel operation. This paper presents a method to reduce the impedance of the triode using a multi-ring cathode. The average electric field on the ring-cathode emission surface is enhanced due to edge effect, and the beam intensity is greatly increased in proportion to the square of the electric field strength. Multi-ring cathode is used to enlarge the emission area. Therefore, the reflex triode can work at lower impedance and generate a stronger beam under the same anode-cathode gap. In addition, the electric field enhancement of the cathode reduces the cathode emission stabilization time and enhances the operation stability of the triode. The effects of parameters such as ring width and ring gap on the triode impedance are simulated and studied. The cathode emission stabilization time and the X-ray conversion efficiency are compared. The design basis of cathode structure parameters and the impedance control method of the cylindrical virtual cathode reflex triode are given according to the simulations.
- pulsed hard x-ray,
- reflex triode,
- high current electron beam,
- bremsstrahlung

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