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Radiative Characteristics of Reversed Polarity Gas-Puff Ar and Kr Plasmas.

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Title: Radiative Characteristics of Reversed Polarity Gas-Puff Ar and Kr Plasmas.
Authors: Shlyaptseva, Veronica, Takasugi, Keiichi, Shikone, Takashi, Hakamatsuka, Shun, Kantsyrev, Victor L., Safronova, Alla S., Petkov, Emil E., Gill, Amandeep K.
Source: IEEE Transactions on Plasma Science. Nov2018, Vol. 46 Issue 11, Part 1, p3842-3848. 7p.
Subjects: Electrodes, Plasma gases, Scanning electron microscopy, Electromagnetic waves, Nanoparticles, Electrons
Abstract: Experiments with regular and reversed polarities were carried out on the SHOTGUN-III Z-pinch device at Nihon University, Japan. SHOTGUN’s storage section consists of the 12- $\mu \text{F}$ fast capacitor bank, which was charged to 25 kV for these experiments and provided current up to 200 kA. The Ar and Kr gases were puffed between the electrodes through a hollow nozzle using a fast gas valve. Time-resolved X-ray detectors, time-integrated X-ray pinhole camera and two spectrometers, and an optical framing camera were applied for the study of radiative properties of Ar and Kr gas puffs. K-shell Ar spectra (3.9–4.2 Å) and L-shell Kr spectra (6.3–7.6 Å) show much intense He- and Li-like Ar and Ne- and Na-like Kr spectral features, respectively, and the evidence of the electron beams in reversed polarity experiments. The influence of reversed polarity on gas-puff plasma radiative characteristics and X-ray spectroscopic measurements is discussed. The advantages of using K-shell Ar and L-shell Kr for hot electron beam diagnostics are highlighted. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Experiments with regular and reversed polarities were carried out on the SHOTGUN-III Z-pinch device at Nihon University, Japan. SHOTGUN’s storage section consists of the 12- $\mu \text{F}$ fast capacitor bank, which was charged to 25 kV for these experiments and provided current up to 200 kA. The Ar and Kr gases were puffed between the electrodes through a hollow nozzle using a fast gas valve. Time-resolved X-ray detectors, time-integrated X-ray pinhole camera and two spectrometers, and an optical framing camera were applied for the study of radiative properties of Ar and Kr gas puffs. K-shell Ar spectra (3.9–4.2 Å) and L-shell Kr spectra (6.3–7.6 Å) show much intense He- and Li-like Ar and Ne- and Na-like Kr spectral features, respectively, and the evidence of the electron beams in reversed polarity experiments. The influence of reversed polarity on gas-puff plasma radiative characteristics and X-ray spectroscopic measurements is discussed. The advantages of using K-shell Ar and L-shell Kr for hot electron beam diagnostics are highlighted. [ABSTRACT FROM AUTHOR]
ISSN:00933813
DOI:10.1109/TPS.2018.2862391