Recent advances in high-power ignitron development

Loree, D.L.; Giesselmann, M.; Kristiansen, M.; Shulski, A.P.; Kihara, R.

doi:10.1109/16.75196

Cited by 7 publications

(2 citation statements)

References 9 publications

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“…Based on the capability of the existing pulse switches with high current load and fast current climb rate, we set f CT as 50 Hz preliminarily [18]. Therefore, according to the abovementioned formula, the mass of a single CT plasma should reach 220 μg.…”

Section: The Required Ct Plasma Parameters Were Initially Evaluatedmentioning

confidence: 99%

Design and platform testing of the compact torus central fueling device for the EAST tokamak

Kong

Zhuang

Lan

et al. 2023

Plasma Sci. Technol.

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Compact Tours (CT) injection is a highly promising technique for the central fueling of future reactor-grade fusion devices since it features extremely high injection velocity and relatively high plasma mass. Recently, a CT injector for the EAST tokamak, EAST-CTI, was developed and platform-tested. In the first round of experiments conducted with low parameter settings, the maximum velocity and mass of the CT plasma were 150 km·s−1 and 90 µg, respectively. However, the parameters obtained by the EAST-CTI were still very low and were far from the requirements of a device such as the EAST that has a strong magnetic field. In the future, we plan to solve the spark problem that the EAST-CTI currently encounters (that mainly hinders the further development of experiments) through engineering methods and use greater power to obtain a more stable and suitable CT plasma for EAST.

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Section: The Required Ct Plasma Parameters Were Initially Evaluatedmentioning

confidence: 99%

Design and platform testing of the compact torus central fueling device for the EAST tokamak

Kong

Zhuang

Lan

et al. 2023

Plasma Sci. Technol.

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“…Ignitrons were employed as switching elements on first large banks ͑Shiva and Nova͒, but they have main drawback in high prefire rate ͑for example, ϳ10% for NL 9000 and ϳ5% for NL8900, Richardson Electronics, at maximum operational parameters 11,12 ͒, taking into account that lifetime expectancy does not exceed 1000 shots. Ignitron specifications always point out that maximum specified ratings on peak voltage, peak current and Coulombs per pulse cannot be obtained simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Three-electrode gas switches with electrodynamical acceleration of a discharge channel

Kovalchuk

Kim

Kharlov

et al. 2008

Review of Scientific Instruments

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High voltage, high current, and high Coulomb transfer closing switches are required for many high power pulsed systems. There are a few alternatives for closing switches, for example, ignitrons, vacuum switches, solid-state switches, high pressure gas switches (spark gaps), and some others. The most popular closing switches up to date are spark gaps due to relatively simple design, robustness, easily field maintenance, and repair. Main drawback of spark gaps is limited lifetime, which is related directly or indirectly to erosion of the electrodes. Multichannel switches and switches with moving arc have been proposed to prevent the electrodes erosion. This study investigates switches, where a spark channel is initiated in a three-electrode layout and then the spark accelerates due to electrodynamic force and moves along the extended electrodes. At a given current amplitude, the diameter of the extended electrodes allows to control the spark velocity and hence, the erosion of the electrodes providing the required lifetime. The first switch is designed for 24 kV charging voltage and approximately 4 C total charge transfer. This spark gap was tested at 25 kA peak current in 40 000 shots in a single polarity discharge and in 20 000 shots in bipolar discharge. Second spark gap is designed for 24 kV charging voltage and approximately 70 C total charge transfer. It was tested in 22 000 shots, at a current of 250 kA with a pulse length of 360 mus. In this paper, we present design of these spark gaps and trigger generator, describe the test bed, and present the results of the tests.

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Plasma Switches

Hegeler¹

2007

Wiley Encyclopedia of Electrical and Electronics Engineering

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The sections in this article are General Switch Parameters Gas Spark Gaps Surface Discharge Swtches Diffuse Discharge Opening Switch Plasma Opening Switches Plasma Flow Switches Thyratrons Tacitrons Crossatrons Pseudospark Switches Ignitrons

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Recent advances in high-power ignitron development

Cited by 7 publications

References 9 publications

Design and platform testing of the compact torus central fueling device for the EAST tokamak

Design and platform testing of the compact torus central fueling device for the EAST tokamak

Three-electrode gas switches with electrodynamical acceleration of a discharge channel

Plasma Switches

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