Proposal of Cryogenic Plasmas in Liquid Helium II

Minami, Kazuo; Watanabe, Shun; Wang, Qin; Tomimoto, Fumihiro; Kuwabara, Shigeyuki; Amin, Md. Ruhul; Kato, Keizo; Satow, T.

doi:10.1143/jjap.34.271

Cited by 12 publications

(5 citation statements)

References 19 publications

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“…Our study is aimed to create transient cryogenic plasma in super-fluid liquid helium (LHeII) in laboratory experiments [15]. At a temperature below 2.17 K, LHeII at 1 atm includes a super-fluid component (Bose-Einstein condensate) that has no viscosity against impurity ions, namely, negative ions (electron bubbles) and positive ions (ice-ball-like He clusters) [7], [8], [16]- [18].…”

Section: Discussion and Future Prospectmentioning

confidence: 99%

“…If this is the case, we may be able to identify collective phenomena in LHeII such as positive plasma oscillation and negative ion acoustic waves that have not been observed in previous literature. This is because the mass of negative ions is much heavier than that of positive ions [15]- [18]. Ion cooling of such cryogenic plasma will be made by the cooling of ambient LHe, which is much easier to do than direct ion cooling.…”

Section: Discussion and Future Prospectmentioning

confidence: 99%

See 1 more Smart Citation

Optical observation of localized plasma after pulsed discharges in liquid helium

Kojima

Minami

Wang³

et al. 2003

IEEE Trans. Plasma Sci.

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A transient hot localized high-density plasma in liquid helium (LHe) after a pulsed discharge with a high voltage (20 kV, 180-360 A, 0.4-7 s) between tungsten (W) needle electrodes has been studied. Spatial and temporal changes of the plasma density in helium gas surrounded by LHe are measured by observing Stark broadening of 587.6-nm HeI spectral line. The localized plasma is found to have density above 10 16 cm 3 with an elongated ellipsoid in shape along the common axis of the needle electrodes. At 0.4 s after the end of discharge, the half widths of the density distribution along and transverse to the axis are typically 0.6 and 1.4 mm, respectively. We have observed strong spectral lines of magnesium (Mg) atoms without Stark broadening, when one of the electrodes is replaced by an Mg rod. After a discharge is over, Mg atoms are confirmed to be incorporated into LHe.Index Terms-Cryogenic plasma, impurity implantation, liquid helium (LHe), pulse discharge, Stark broadening.

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Section: Discussion and Future Prospectmentioning

confidence: 99%

Section: Discussion and Future Prospectmentioning

confidence: 99%

Optical observation of localized plasma after pulsed discharges in liquid helium

Kojima

Minami

Wang³

et al. 2003

IEEE Trans. Plasma Sci.

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“…To achieve this, the formation of plasmas in ultracold conditions were carried out by several groups [10][11][12]. Here also, the main motivation was to determine the plasma properties, mainly electron temperature and electron density in strongly coupled plasmas, when the coupling was achieved by the ultralow temperature.…”

Section: Overviewmentioning

confidence: 99%

Review on plasmas in extraordinary media: plasmas in cryogenic conditions and plasmas in supercritical fluids

Stauss

Muneoka

Terashima

2018

Plasma Sources Sci. Technol.

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Plasma science and technology has enabled advances in very diverse fields: micro-and nanotechnology, chemical synthesis, materials fabrication and, more recently, biotechnology and medicine. While many of the currently employed plasma tools and technologies are very advanced, the types of plasmas used in micro-and nanofabrication pose certain limits, for example, in treating heat-sensitive materials in plasma biotechnology and plasma medicine. Moreover, many physical properties of plasmas encountered in nature, and especially outer space, i.e. very-low-temperature plasmas or plasmas that occur in high-density media, are not very well understood. The present review gives a short account of laboratory plasmas generated under 'extreme' conditions: at cryogenic temperatures and in supercritical fluids. The fundamental characteristics of these cryogenic plasmas and cryoplasmas, and plasmas in supercritical fluids, especially supercritical fluid plasmas, are presented with their main applications. The research on such exotic plasmas is expected to lead to further understanding of plasma physics and, at the same time, enable new applications in various technological fields.

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“…The main advantage of the cryo-plasma is that one can control the gas temperature continuously below the room temperature to cryogenic temperatures such as those of liquid nitrogen (77 K) and liquid helium (4.2 K). In the past, the cryogenictemperature plasma was studied to analyze the behavior of ions and electrons at liquid nitrogen and helium temperatures [7][8][9]. However, until now, there has been almost no research on the continuously gas temperature changed plasma below room temperature or on its application to various fields, such as materials processing.…”

Section: Introductionmentioning

confidence: 99%

Development of a dielectric barrier discharge (DBD) cryo-microplasma: generation and diagnostics

Ishihara

Noma

Stauss

et al. 2008

Plasma Sources Sci. Technol.

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We developed a cryo-microplasma, which can continuously control gas temperature below room temperature and below the freezing point of water. To develop the cryo-microplasma, we first developed an atmospheric-pressure low-temperature microplasma that can suppress the increase in its gas temperature. Helium gas was employed, which was generated in open air. The average estimated electron density and temperature were 10 8 -10 9 cm −3 and 4-5 eV, respectively, independent of the applied voltage. Then, helium gas, which was the working gas of the atmospheric-pressure low-temperature microplasma, was cooled by liquid nitrogen to generate an atmospheric-pressure cryo-microplasma in open air. We observed the generation of frost around the quartz tube in which the plasma was generated and an increase in atomic oxygen emission by optical emission spectroscopy. Finally, to avoid the generation of frost, a cryo-microplasma was generated in a reactor chamber separated from open air. Helium, nitrogen and oxygen were employed as working gases. Using thermocouples and by estimation from the nitrogen rotational temperature, we verified that the gas temperature of the cryo-microplasma was much lower (T g ≈ 180-300 K) than that of the conventional atmospheric-pressure low-temperature plasma (above 300 K).

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Proposal of Cryogenic Plasmas in Liquid Helium II

Cited by 12 publications

References 19 publications

Optical observation of localized plasma after pulsed discharges in liquid helium

Optical observation of localized plasma after pulsed discharges in liquid helium

Review on plasmas in extraordinary media: plasmas in cryogenic conditions and plasmas in supercritical fluids

Development of a dielectric barrier discharge (DBD) cryo-microplasma: generation and diagnostics

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