Characterization of a high-density plasma produced by electrothermal capillary discharge

Kim, J. U.; Suk, Hyyong

doi:10.1063/1.1435807

Cited by 20 publications

(11 citation statements)

References 13 publications

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“…Six distinct atomic iron lines (Fe I: 340.4, 356.4, 403.3, 425.9, 518.8 and 539.7 nm) were used in the plasma jet to measure the electron temperature, and the Boltzmann plot method was employed assuming that the plasma is in local thermodynamic equilibrium [17]. Based on this, we calculate the electron density of the plasma jet with an iron atom (Fe I: 340.4 nm) and a univalent iron ion line (Fe II: 576.4 nm) by Saha equation.…”

Section: Resultsmentioning

confidence: 99%

Analysis on discharge process of a plasma-jet triggered gas spark switch

Tie¹,

Meng²,

Zhang³

et al. 2017

Plasma Sci. Technol.

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The plasma-jet triggered gas switch (PJTGS) could operate at a low working coefficient with a low jitter. We observed and analyzed the discharge process of the PJTGS at the lowest working coefficient of 47% with the trigger voltage of 40 kV and the pulse energy of 2 J to evaluate the effect of the plasma jet. The temporal and spatial evolution and the optical emission spectrum of the plasma jet were captured. And the spraying delay time and outlet velocity under different gas pressures were investigated. In addition, the particle in cell with Monte Carlo collision was employed to obtain the particle distribution of the plasma jet varying with time. The results show that, the plasma jet generated by spark discharge is sprayed into a spark gap within tens of nanoseconds, and its outlet velocity could reach 10 4 m s −1 . The plasma jet plays a non-penetrating inducing role in the triggered discharge process of the PJTGS. On the one hand, the plasma jet provides the initial electrons needed by the discharge; on the other hand, a large number of electrons focusing on the head of the plasma jet distort the electric field between the head of the plasma jet and the opposite electrode. Therefore, a fast discharge originated from the plasma jet is induced and quickly bridges two electrodes.

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Section: Resultsmentioning

confidence: 99%

Analysis on discharge process of a plasma-jet triggered gas spark switch

Tie¹,

Meng²,

Zhang³

et al. 2017

Plasma Sci. Technol.

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“…7 While many noncoherent sources have been designed with a half period discharge time in the range of 50-200 ns, 5,[8][9][10][11] even longer period capillary discharges are reported. 12 However less work has been presented in shorter period discharges. A common thread to applied research is obtaining options for a suitable source with line emission at 135 Å, given the pressing need for ultrafine scale lithography.…”

Section: Introductionmentioning

confidence: 98%

Fast plasma discharge capillary design as a high power throughput soft x-ray emission source

Wyndham

Favre

Valdivia

et al. 2010

Review of Scientific Instruments

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We present the experimental details and results from a low energy but high repetition rate compact plasma capillary source for extreme ultraviolet and soft x-ray research and applications. Two lengths of capillary are mounted in two versions of a closely related design. The discharge operates in 1.6 and 3.2 mm inner diameter alumina capillaries of lengths 21 and 36 mm. The use of water both as dielectric and as coolant simplifies the compact low inductance design with nanosecond discharge periods. The stored electrical energy of the discharge is approximately 0.5 J and is provided by directly charging the capacitor plates from an inexpensive insulated-gate bipolar transistor in 1 μs or less. We present characteristic argon spectra from plasma between 30 and 300 Å as well as temporally resolved x-ray energy fluence in discrete bands on axis. The spectra also allow the level of ablated wall material to be gauged and associated with useful capillary lifetime according to the chosen configuration and energy storage. The connection between the electron beams associated with the transient hollow cathode mechanism, soft x-ray output, capillary geometry, and capillary lifetime is reported. The role of these e-beams and the plasma as measured on-axis is discussed. The relation of the electron temperature and the ionization stages observed is discussed in the context of some model results of ionization in a non-Maxwellian plasma.

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“…Some fundamental researches have been done by some scholars addressing these problems. Kohel et al [1] tested some parameters of the plasma jet using a radiation spectrometer; Wilson et al [2] established a theory model for the supersonic underexpanded plasma jet; Kim [3] and Kim et al [4,5] [20,21] studied the interaction characteristics of the plasma jet with the liquid in the cylindrical chamber and the cylindrical stepped chamber, respectively. On this basis, we have designed a simulating device to study the expansion and mixing properties of plasma jet in the liquid medium in this paper.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Numerical Simulation on Propagation Properties of a Plasma Jet in a Cylindrical Liquid Chamber

Yu¹,

Zhang²,

Zhao³

et al. 2013

Journal of Applied Mechanics

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A simulator is designed to explore the interactive mechanism of a plasma jet with the liquid medium in the bulk-loaded liquid electrothermal chemical launching process. The properties of the plasma jet expanding in the liquid and the mixing characteristics of the plasma jet with liquid in the cylindrical chamber are studied using a high speed camera system. According to the experimental results, a two-dimensional axisymmetric unsteady compressible flow model has been proposed. The transient characteristics of the jet in flow fleld have been simulated. The results indicate that, during the expansion of the plasma jet in the liquid medium, there is relatively strong turbulent mixing. The inteiface between the two phases is not smooth and fluctuates with time stochastically. The higher the discharge voltage is, the stronger the Helmholtz instability effect will be. The Taylor cavity forming during the jet expansion can be divided into three regions: the main flow region, the compression region, and the backflow vortex region. In the main flow region the temperature and velocity of the plasma jet are relatively high and both decrease along the axial and radial direction. The pressure near the Taylor cavity head is high. The high pressure region grows gradually while the pressure value decreases. The calculated axial expansion displacement of the Taylor cavity coincides well with the measured one from experiment.

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Characterization of a high-density plasma produced by electrothermal capillary discharge

Cited by 20 publications

References 13 publications

Analysis on discharge process of a plasma-jet triggered gas spark switch

Analysis on discharge process of a plasma-jet triggered gas spark switch

Fast plasma discharge capillary design as a high power throughput soft x-ray emission source

Experimental Study and Numerical Simulation on Propagation Properties of a Plasma Jet in a Cylindrical Liquid Chamber

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