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

Lin, Min; Xia, Zhilin; Zhou, Hang; Sun, Xuan

doi:10.1088/1748-0221/15/03/p03029

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…As a result, a new set-up is proposed. This set-up consist of two capacitor banks and a third switch as indicated by figure 11 and is adopted from existing schemes [20][21][22]. The first bank ignites the gas and already creates a highly ionized plasma.…”

Section: Discussionmentioning

confidence: 99%

Time-resolved measurement of the free electron and neutral gas line density in a hydrogen theta-pinch plasma target by two-color interferometry

Christ

Guzmán

Cistakov

et al. 2022

J. Phys. D: Appl. Phys.

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A hydrogen theta-pinch plasma is diagnosed by two-color interferometry to determine the line density of the free electrons and the hydrogen gas. From the ratio of these line densities, the effective ionization can be calculated. The free electron line density and the effective ionization degree are the most essential quantities for the evaluation of the plasma regarding its applicability as a target in context of plasma ion beam interaction to increase the charge state of the ion beam (plasma stripper). The two-color interferometric diagnostic shows that both line densities exhibit a periodic behavior predefined by the periodic current and at the time the free electron line density reaches a local maximum, the hydrogen line density falls to a local minimum. This occurs, because the plasma is axially ejected from the coil center by evading the radial compression force of the magnetic field, creating an ionizing wave in the residual gas. The theta-pinch was set up in two versions, with one of them using a cylindrical coil and the other using a spherical coil. For the cylindrical version, the best working point regarding the free electron line density and the effective ionization degree is (1.45±0.04)·1018 cm-2 and (0.826±0.022) at 20 Pa and 16 kV. In contrast, for the spherical version, lower values of (1.23±0.03)·1018cm-2 and (0.699±0.019) at 20 Pa and 18 kV were found. Additionally, a new set-up is proposed for optimizing the plasma target regarding the free electron line density and the effective ionization degree, as well as how to maintain them on a sufficient level for several 10 µs.

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Section: Discussionmentioning

confidence: 99%

Time-resolved measurement of the free electron and neutral gas line density in a hydrogen theta-pinch plasma target by two-color interferometry

Christ

Guzmán

Cistakov

et al. 2022

J. Phys. D: Appl. Phys.

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Discharge Formation in a Trigger Unit Based on a Breakdown Over the Dielectric Surface in a Coldcathode Thyratron

et al. 2022

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Low-pressure discharge with hollow cathode and hollow anode in a trigger unit of pseudospark switch

et al. 2021

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This paper deals with the investigations of the auxiliary glow discharge in the trigger unit of the pseudospark switch. The trigger unit communicates with the grounded electrode of the main high-voltage gap due to the aperture in the flat part of one of the trigger electrodes. Then, the so-called parasitic current closes to the main electrode via this aperture. This paper is mainly concentrated on the problem of the formation of the parasitic current for different regimes of the auxiliary discharge burning and for different designs of the trigger system. At a low current, the auxiliary discharge burns in the suppressed regime, and an increase in the current results in the stepwise transition to the ordinary glow discharge. The conditions of sustaining the auxiliary discharge influence on the value of the parasitic current. In the experiments, the cavity of the trigger electrode can play a role of the hollow cathode or the hollow anode, so that the negative glow plasma or the positive column plasma is generated in this hollow electrode. It is demonstrated that for both cases, the parasitic current is determined by the ion flow from the plasma boundary.

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

Cited by 3 publications

References 23 publications

Time-resolved measurement of the free electron and neutral gas line density in a hydrogen theta-pinch plasma target by two-color interferometry

Time-resolved measurement of the free electron and neutral gas line density in a hydrogen theta-pinch plasma target by two-color interferometry

Discharge Formation in a Trigger Unit Based on a Breakdown Over the Dielectric Surface in a Coldcathode Thyratron

Low-pressure discharge with hollow cathode and hollow anode in a trigger unit of pseudospark switch

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