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Extreme UV spectroscopy measurements and analysis for tungsten density studies in the WEST tokamak

Abstract : The VUV emission of tungsten in WEST is measured by an absolutely calibrated grazing incidence spectrometer of the Schwob-Fraenkel type which can scan the lower half of the plasma. We have analysed the detected spectral lines in the range 120-140 Å and compared their behaviour with calculations and published information. We obtained an unambiguous identification of four intense and well resolved spectral lines emitted by W$^{42+}$-W$^{45+}$ close to the magnetic axis in the analysed experiments. The measured spectral line brightnesses are used to assess the Tungsten density in the emission region. In a case of a scanning line of sight, we investigate the possibility to calculate the Tungsten density profile from the angular brightness profiles. In a case of a fixed line of sight, we deduce from the measurements the core Tungsten density profile evolution during a radiative collapse.
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https://hal-cea.archives-ouvertes.fr/cea-03623368
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Submitted on : Tuesday, March 29, 2022 - 4:30:28 PM
Last modification on : Thursday, March 31, 2022 - 3:31:28 AM
Long-term archiving on: : Thursday, June 30, 2022 - 7:31:09 PM

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  • HAL Id : cea-03623368, version 1

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R. Guirlet, C. Desgranges, J. L. Schwob, P. Mandelbaum, M. Y. Boumendjel. Extreme UV spectroscopy measurements and analysis for tungsten density studies in the WEST tokamak. Plasma Physics and Controlled Fusion, IOP Publishing, In press. ⟨cea-03623368⟩

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