Novel inferences of ionisation and recombination for particle/power balance during detached discharges using deuterium Balmer line spectroscopy

Verhaegh, K. and Lipschultz, B. and Duval, B. P. and Fil, A. and Wensing, M. and Bowman, C. and Gahle, D. S. (2019) Novel inferences of ionisation and recombination for particle/power balance during detached discharges using deuterium Balmer line spectroscopy. Plasma Physics and Controlled Fusion, 61 (12). 125018. ISSN 0741-3335 (https://doi.org/10.1088/1361-6587/ab4f1e)

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Abstract

The physics of divertor detachment is determined by divertor power, particle and momentum balance. This work provides a novel analysis technique of the Balmer line series to obtain a full particle/power balance measurement of the divertor. This supplies new information to understand what controls the divertor target ion flux during detachment. Atomic deuterium excitation emission is separated from recombination quantitatively using Balmer series line ratios. This enables analysing those two components individually, providing ionisation/recombination source/sinks and hydrogenic power loss measurements. Probabilistic Monte Carlo techniques were employed to obtain full error propagation - eventually resulting in probability density functions for each output variable. Both local and overall particle and power balance in the divertor are then obtained. These techniques and their assumptions have been verified by comparing the analysed synthetic diagnostic 'measurements' obtained from SOLPS simulation results for the same discharge. Power/particle balance measurements have been obtained during attached and detached conditions on the TCV tokamak.

ORCID iDs

Verhaegh, K., Lipschultz, B., Duval, B. P., Fil, A., Wensing, M., Bowman, C. and Gahle, D. S. ORCID logoORCID: https://orcid.org/0000-0002-4434-7626;
  • Item type:Article
    ID code:77786
    Dates:
    Date
    Event
    11 November 2019
    Published
    18 October 2019
    Accepted
    Notes:Publisher Copyright: © University of York.
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:16 Sep 2021 09:51
    Last modified:13 Nov 2024 23:44
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/77786
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