Development of high-power gas discharge and electronic vacuum devices for pulsed electrophysic. Current status and prospects

Bochkov, V.D.; Bochkov, D.V.; Dyagilev, V.M.; Panov, P. V.; Teryoshin, Vasiliy; Vasiliev, I. V.; Ushich, V.G.

doi:10.1063/1.4964229

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…It needs to have the characteristics of low inductance and low resistance, which are far less than that of inductive coil load. TDI-series pseudospark switches [18,[22][23][24][25][26], also known as cold cathode thyratrons, work on the left-hand branch of the Paschen curve and are used as main switch and crowbar switch, as shown in figure 6. The TDI-series pseudospark switches have a ceramic/metal shell, filled with hydrogen (deuterium) as buffer gas at working pressure of 20-60 Pa.…”

Section: Pseudospark Switchesmentioning

confidence: 99%

High-voltage and high-current crowbar system based on pseudospark switches: from system design to verification

et al. 2020

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This paper presents a high-voltage and high-current crowbar system using pseudospark switches to produce a fast front edge and prolonged pulse current with low ripple amplitude. The crowbar system mainly consists of a main switch, a crowbar switch, an energy storage capacitor, and an inductive load. The basic parameters of the pseudospark switch crowbar system: the storage capacitance is 5 µF, the typical operation voltage is 30 kV, the peak discharge current is about 46.2 kA, the rise time is 4.3 µs, and the pulse duration time is approximately 109 µs, which is nearly 25 times of the rise time. In this paper, we report the timing setting for crowbar system. Experimental results show that crowbar timing should be set slightly after first current maximum, which has a great advantage of increasing the time scale without any reduction in the loss-free peak current. In addition, the pulse current characteristics are also studied. In the research, crowbar inductance L c and crowbar resistance R c have significant effects on the ripple amplitude and load current amplitude of pulse current. The experimental results also show that the crowbar current I c can reach nearly twice of the coil load current I load with low crowbar inductance L c . The over-current capacity of the crowbar switch needs to be greater than that of the main switch. The experimental results in this paper can be used to optimize the inductive load current in high-voltage and high-current crowbar system. K: Pulsed power; Plasma generation (laser-produced, RF, x ray-produced)1Corresponding author.

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Section: Pseudospark Switchesmentioning

confidence: 99%

High-voltage and high-current crowbar system based on pseudospark switches: from system design to verification

et al. 2020

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“…High power and high repetition frequency switches of GW class kHz are also required in high energy laser weapons [1]. In daily life and industrial production, high pulse repetition frequency switches can greatly improve work efficiency in sewage treatment, food processing and other fields [2][3]. The existing pulse power technology switches include solid switches, thyratron switches, field distortion switches, pseudospark switches and so on.…”

Section: Introductionmentioning

confidence: 99%

Study on pseudospark switch with high repetition frequency with double-pulse triggering

wj,

Feng

2024

Preprint

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The pseudospark switch works in the left branch of Paschen curve with low gas pressure, which has the advantage of short electrode breakdown time (<10ns), large pulse current (>100kA), and long lifetime, etc. High pulse repetition frequency (PRF) pseudospark switch has important applications in food processing, sewage treatment, high energy laser system, sonar syste, and other fields, the pseudospark switch with a PRF of kHz-level is needed. This paper focuses on the pseudospark switch with double-pulse trigger structure, and the corresponding relationship between the two trigger voltages and current is calculated respectively, and the influence of the two pulses on the trigger process is analyzed. Then the pseudospark switch with this structure is tested with the anode voltage of 10kV for different voltage and gas pressure. The results show that the minimum trigger voltage is only 100V, and the switch can work stably with high repetition frequency.

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“…Pseudospark-based devices have remarkable features including a hold-off voltage of 10's kV, current capacity of 10's kA, trigger jitter of about 1 ns, repetition rate of several kHz, and electrode erosion rate of about 10 μg/C [6]. Thus, various applications were developed, including electron beam sources developed by scholars from the United Kingdom [7], India [8], and China [9][10][11], extreme ultraviolet light sources developed by scholars from Germany [12] and France [13], high power switches developed by scholars from Russia [14,15] and India [16][17][18], et al To further improve the performances of these devices, considerable efforts have been devoted to the explorations of mechanisms underlying pseudospark discharge. Several sub-phases of the discharge process with distinctive features were clarified, including (I) pre-breakdown phase, (II) hollow cathode discharge (HCD), (III) superdense glow discharge (SGD), and (IV) high current phase with arc cathode spots [4,5,19,20].…”

Section: Introductionmentioning

confidence: 99%

Revealing phase transitions and instabilities in pseudospark discharges

et al. 2022

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Pseudospark discharge is a low‐pressure high‐voltage pulsed discharge with hollow electrodes, and the overall discharge experiences several distinctive sub‐phases. The instability phenomena, characterised by the sudden oscillations or distortions of discharge voltage and current, restrict the applications of pseudospark discharge. This study presents an investigation into phase transitions and instabilities in pseudospark discharge by combining the evidences from multiple discharge waveforms, time‐resolved images, electron beam current profiles, 2D kinetic simulation results, and the spectral line emission of cathode material. The process of a normal pseudospark discharge is firstly discussed, and the threshold conditions of the transition from the superdense glow discharge (SGD) phase to the high current phase with arc cathode spots are addressed. According to temporal profiles and voltage‐current characteristics, two types and four occurrences of instabilities are distinguished: type I—in the pre‐breakdown phase; type II‐1—in the SGD phase; type II‐2—in the transition of cathode spots propagating from cathode hole edge to cathode plane; type II‐3—in the re‐initiation of spots near current reversal. It is found that the instability of type I is caused by the stepwise penetration of virtual anode plasma, and type II is closely related to the cyclic nature and finite lifetime of cathode spots. It is induced by the fact that the decay of cathode spots is faster than the formation under certain conditions, and the existing spots are not able to provide the current required by the external circuit. Important features and the suppression methods of the instabilities are discussed based on the proposed mechanisms.

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Development of high-power gas discharge and electronic vacuum devices for pulsed electrophysic. Current status and prospects

Cited by 10 publications

References 12 publications

High-voltage and high-current crowbar system based on pseudospark switches: from system design to verification

High-voltage and high-current crowbar system based on pseudospark switches: from system design to verification

Study on pseudospark switch with high repetition frequency with double-pulse triggering

Revealing phase transitions and instabilities in pseudospark discharges

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