Observation of emission process in hydrogen-like nitrogen Z-pinch discharge with time integrated soft X-ray spectrum pinhole image

The emission spectra of hydrogen-like nitrogen Balmer at the wavelength of 13.4 nm in capillary Z-pinch discharge plasma are experimentally examined. Ionization to fully strip nitrogen at the pinch maximum, and subsequent rapid expansion cooling are required to establish the population inversion bet...

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Published inPhysics of plasmas Vol. 20; no. 2
Main Authors Sakai, Y., Rosenzweig, J., Kumai, H., Nakanishi, Y., Ishizuka, Y., Takahashi, S., Komatsu, T., Xiao, Y., Bin, H., Quishi, Z., Hayashi, Y., Song, I., Kawamura, T., Watanabe, M., Hotta, E.
Format Journal Article
LanguageEnglish
Published United States 01.02.2013
Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AMPLITUDES
BEAM-PLASMA SYSTEMS
CAPILLARIES
Capillarity
Discharge
Emission
EMISSION SPECTRA
EXPANSION
IONIZATION
LONGITUDINAL PINCH
LUMINESCENCE
NITROGEN
Pinholes
PLASMA
Plasmas
POPULATION INVERSION
PULSES
RECOMBINATION
SOFT X RADIATION
WAVELENGTHS
X-RAY SPECTRA
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ISSN1070-664X
1089-7674
DOI10.1063/1.4789617

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Summary:The emission spectra of hydrogen-like nitrogen Balmer at the wavelength of 13.4 nm in capillary Z-pinch discharge plasma are experimentally examined. Ionization to fully strip nitrogen at the pinch maximum, and subsequent rapid expansion cooling are required to establish the population inversion between the principal quantum number of n = 2 and n = 3. The ionization and recombination processes with estimated plasma parameters are evaluated by utilizing a time integrated spectrum pinhole image containing radial spatial information. A cylindrical capillary plasma is pinched by a triangular pulsed current with peak amplitude of 50 kA and pulse width of 50 ns.
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ISSN:1070-664X
1089-7674
DOI:10.1063/1.4789617