Design and construction of a ±100 kV gas switch for linear transformer drivers

Jiang, Jinbo; Liu, Jun; Liu, Minghai; He, Mengbing

doi:10.1109/tdei.2015.7076833

Cited by 8 publications

(2 citation statements)

References 12 publications

(16 reference statements)

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“…So the high voltage pulses used to trigger the switches in the LTD stage should be continuously generated with the same repetition rate. For now the main switches used in the LTD are multi-stage gas switches and three-electrode spark gap switches [3][4][5][6]. All these switches demand that the trigger source would reliably generate sequential low jitter fast rise-time high voltage pulses with repetition rate 0.1 Hz (with jitter less than 10 ns, fast rise-time less than 20 ns) [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Thus each structure capacitance formed between the electrode of switch and out shielding vessel is the same. At the same time it is convenient to employ the UV pre-ionization gap to reduce the switch delay time and jitter [6]. All the switches employed in the Marx generator are brass spark gaps with diameter 13 mm and 2.6 mm apart except the first gap.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A trigger source for linear transformer driver

Cui¹,

Li²,

Wang³

et al. 2023

J. Inst.

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A repetitive low jitter trigger source applied in triggering the multi-gap gas switch of the linear transformer driver (LTD) stage, is designed and developed in this paper.The pulse source based on fast Marx topology can repetitively output a low jitter high voltage pulse into a 50 Ω resistance load with peak value of 150 kV, rising time of 7 ns, width of 260 ns and rep-rate 0.1 Hz. Proper design of stray capacitance to peak the output pulse and employing the UV light to pre-ionize each consequent stage gap to reduce the switch delay time and jitter have been proposed. All those have been demonstrated feasible and reliable. A software program control unit has been developed for operation and control of fast Marx generator. The software gives full remote control by a computer via optical fiber communication. The experimental results show that the trigger source can continuously and reliably generate a 150 kV/260 ns pulse into a resistive load every 10 s with 1-σ jitter less than 2.7 ns. The trigger source is compact and portable and agrees well with the trigger demands of LTD for new fusion energy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A trigger source for linear transformer driver

Cui¹,

Li²,

Wang³

et al. 2023

J. Inst.

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show abstract

Experimental investigation on the effect of plasma jet in the triggered discharge process of a gas switch

Tie

Liu

et al. 2016

Physics of Plasmas

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The temporal and spatial evolution of a plasma jet generated by a spark discharge was observed. The electron temperature and density were obtained under different time and gas pressures by optical emission spectroscopy. Moreover, the discharge process of the plasma-jet triggered gas switch was recorded and analyzed at the lowest working coefficient. The results showed that the plasma jet moved forward in a bullet mode, and the advancing velocity increased with the decrease of pressure, and decreased with time growing. At initial time, the maximum velocity of a plasma jet could reach 3.68 × 106 cm/s. The electron temperature decreased from 2.0 eV to 1.3 eV, and the electron density increased from 3.1 × 1015/cm3 to 6.3 × 1015/cm3 at the initial moment as the gas pressure increases from 0.1 MPa to 0.32 MPa. For a two-gap gas switch, the discharge performances were more depended on the second discharge spark gap (gap 2). Because plasma jet promoted the discharge in Gap 2, the gas switch operating in mode II had better triggered discharge characteristics. In the discharge process, the plasma-jet triggering had the effect of non-penetrating inducing, which not only provided initial electrons for reducing statistical lag but also enhanced the local electric field. The discharge was initiated and accelerated from electron avalanche to streamer. Therefore, a fast discharge was occurred in the gas switch.

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A plasma-triggered gas switch

et al. 2018

Review of Scientific Instruments

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This paper presents a low-jitter, low-trigger-threshold, high-dielectric-constant ceramic, plasma-triggered gas switch developed for pulsed power generators. We also discuss the principles behind the switch and the experiments and numerical calculations used. The electron emission and surface flashover in the trigger structure are used to create the initial plasma for switch breakdown. The experimental results show that the switch is triggered stably with a negative pulse of −50 kV peak and has a breakdown delay time jitter of 2–3 ns. In this jitter performance, the switch has a switch coefficient below 20%, and a peak current-carrying ability of at least ±5 kA in dry air at atmospheric pressure. The switch can also be reliably triggered with a switch coefficient of 49.7% and an over-voltage ratio of only 0.16 in dry air.

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Design and construction of a ±100 kV gas switch for linear transformer drivers

Cited by 8 publications

References 12 publications

A trigger source for linear transformer driver

A trigger source for linear transformer driver

Experimental investigation on the effect of plasma jet in the triggered discharge process of a gas switch

A plasma-triggered gas switch

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