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 A) and L-shell Kr spectra (6.3–7.6 A) 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.
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