Dielectronic recombination of the open 4d-shell of tungsten: W$^{37+}$ to W$^{28+}$

Preval, S. P. and Badnell, N. R. and O'Mullane, M. G. (2018) Dielectronic recombination of the open 4d-shell of tungsten: W$^{37+}$ to W$^{28+}$. Journal of Physics B: Atomic, Molecular and Optical Physics, 51 (4). 045004. ISSN 0953-4075 (https://doi.org/10.1088/1361-6455/aaa182)

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Abstract

Tungsten is an important element for magnetically confined fusion plasmas but has the potential to cool, or even quench the plasma due to it being an efficient radiator. Total and level-resolved dielectronic recombination (DR) rate coefficients, for all ionization stages, are essential to model tungsten. We describe a set calculations performed using the distorted wave code autostructure for the tungsten ions W 37+ to W 28+. We demonstrate the importance of relativistic configuration mixing in such calculations. In particular, we show that the partial DR rate coefficients calculated in level and configuration resolution can differ by as little as 5%, and up to as much as 75%. Using the new data, we calculate a revised steady-state ionization fraction for tungsten. We find that, relative to the ionization fraction calculated using the recombinat ion rate coefficients of Putterich et al (Plasma Phys. Control. Fusion, 50, 085016), the peak temperatures of W 37+ to W 28+ ionization states are shifted to lower temperatures spanning 0.9-1.6keV. This temperature range is important for understanding the performance of large tokamaks, such as ITER, because the tem peratures in the pedestal, edge, scrape-off-layer and divertor region fall in this range.

  • Item type:Article
    ID code:63440
    Dates:
    Date
    Event
    24 January 2018
    Published
    13 December 2017
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:07 Mar 2018 15:41
    Last modified:08 Apr 2024 23:52
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/63440
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