Estimation of plasma parameters of X-pinch with time-resolved x-ray spectroscopy

Ham Seunggi; Ryu Jonghyeon; Lee Hakmin; Park Sungbin; Ghim Y.-C.; Hwang Y. S.; Chung Kyoung-Jae

doi:10.1063/5.0131369

Volume 8 Issue 3

May 2023

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Ham Seunggi, Ryu Jonghyeon, Lee Hakmin, Park Sungbin, Ghim Y.-C., Hwang Y. S., Chung Kyoung-Jae. Estimation of plasma parameters of X-pinch with time-resolved x-ray spectroscopy[J]. Matter and Radiation at Extremes, 2023, 8(3): 036901. doi: 10.1063/5.0131369

Citation:

Ham Seunggi, Ryu Jonghyeon, Lee Hakmin, Park Sungbin, Ghim Y.-C., Hwang Y. S., Chung Kyoung-Jae. Estimation of plasma parameters of X-pinch with time-resolved x-ray spectroscopy[J]. Matter and Radiation at Extremes, 2023, 8(3): 036901. doi: 10.1063/5.0131369

Citation:

Ham Seunggi, Ryu Jonghyeon, Lee Hakmin, Park Sungbin, Ghim Y.-C., Hwang Y. S., Chung Kyoung-Jae. Estimation of plasma parameters of X-pinch with time-resolved x-ray spectroscopy[J]. Matter and Radiation at Extremes, 2023, 8(3): 036901. doi: 10.1063/5.0131369

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Estimation of plasma parameters of X-pinch with time-resolved x-ray spectroscopy

doi: 10.1063/5.0131369

1.
Department of Energy Systems Engineering, Seoul National University, Seoul 08826, South Korea
2.
Department of Nuclear and Quantum Engineering, KAIST, Daejeon 34141, South Korea

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Corresponding author: a)Author to whom correspondence should be addressed: jkjlsh1@snu.ac.kr
Received Date: 2022-10-20
Accepted Date: 2023-02-20

Available Online: 2023-05-01

Publish Date: 2023-05-01

Abstract

Abstract

We estimate the parameters of a Cu plasma generated by an X-pinch by comparing experimentally measured x-rays with synthetic data. A filtered absolute extreme ultraviolet diode array is used to measure time-resolved x-ray spectra with a spectral resolution of ∼1 keV in the energy range of 1–10 keV. The synthetic spectra of Cu plasmas with different electron temperatures, electron densities, and fast electron fractions are calculated using the FLYCHK code. For quantitative comparison with the measured spectrum, two x-ray power ratios with three different spectral ranges are calculated. We observe three x-ray bursts in X-pinch experiments with two Cu wires conducted on the SNU X-pinch at a current rise rate of ∼0.2 kA/ns. Analysis of the spectra reveals that the first burst comprises x-rays emitted by hot spots and electron beams, with characteristics similar to those observed in other X-pinches. The second and third bursts are both generated by long-lived electron beams formed after the neck structure has been completely depleted. In the second burst, the formation of the electron beam is accompanied by an increase in the electron density of the background plasma. Therefore, the long-lived electron beams generate the additional strong x-ray bursts while maintaining a plasma channel in the central region of the X-pinch. Moreover, they emit many hard x-rays (HXRs), enabling the SNU X-pinch to be used as an HXR source. This study confirms that the generation of long-lived electron beams is crucial to the dynamics of X-pinches and the generation of strong HXRs.

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References(37)

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