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

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Title: Novel inferences of ionisation and recombination for particle/power balance during detached discharges using deuterium Balmer line spectroscopy.
Authors: K Verhaegh1,2,3 kevin.verhaegh@ukaea.uk, B Lipschultz1, B P Duval2, A Fil1,4, M Wensing2, C Bowman1,4, D S Gahle4,5, team, the T. C. V.6, team, the EUROfusion MST17
Source: Plasma Physics & Controlled Fusion. Dec2019, Vol. 61 Issue 12, p1-1. 1p.
Subjects: Balance of power, Neutral beams, Deuterium, Probability density function, Atomic excitation, Particles, Spectrometry
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. [ABSTRACT FROM AUTHOR]
Copyright of Plasma Physics & Controlled Fusion is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Novel inferences of ionisation and recombination for particle/power balance during detached discharges using deuterium Balmer line spectroscopy.
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  Data: <searchLink fieldCode="AR" term="%22K+Verhaegh%22">K Verhaegh</searchLink><relatesTo>1,2,3</relatesTo><i> kevin.verhaegh@ukaea.uk</i><br /><searchLink fieldCode="AR" term="%22B+Lipschultz%22">B Lipschultz</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22B+P+Duval%22">B P Duval</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22A+Fil%22">A Fil</searchLink><relatesTo>1,4</relatesTo><br /><searchLink fieldCode="AR" term="%22M+Wensing%22">M Wensing</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22C+Bowman%22">C Bowman</searchLink><relatesTo>1,4</relatesTo><br /><searchLink fieldCode="AR" term="%22D+S+Gahle%22">D S Gahle</searchLink><relatesTo>4,5</relatesTo><br /><searchLink fieldCode="AR" term="%22team%2C+the+T%2E+C%2E+V%2E%22">team, the T. C. V.</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22team%2C+the+EUROfusion+MST1%22">team, the EUROfusion MST1</searchLink><relatesTo>7</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Plasma+Physics+%26+Controlled+Fusion%22">Plasma Physics & Controlled Fusion</searchLink>. Dec2019, Vol. 61 Issue 12, p1-1. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Balance+of+power%22">Balance of power</searchLink><br /><searchLink fieldCode="DE" term="%22Neutral+beams%22">Neutral beams</searchLink><br /><searchLink fieldCode="DE" term="%22Deuterium%22">Deuterium</searchLink><br /><searchLink fieldCode="DE" term="%22Probability+density+function%22">Probability density function</searchLink><br /><searchLink fieldCode="DE" term="%22Atomic+excitation%22">Atomic excitation</searchLink><br /><searchLink fieldCode="DE" term="%22Particles%22">Particles</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrometry%22">Spectrometry</searchLink>
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  Data: 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. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Plasma Physics & Controlled Fusion is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1088/1361-6587/ab4f1e
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        Text: English
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      – SubjectFull: Balance of power
        Type: general
      – SubjectFull: Neutral beams
        Type: general
      – SubjectFull: Deuterium
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      – SubjectFull: Probability density function
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      – SubjectFull: Atomic excitation
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      – SubjectFull: Particles
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      – SubjectFull: Spectrometry
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      – TitleFull: Novel inferences of ionisation and recombination for particle/power balance during detached discharges using deuterium Balmer line spectroscopy.
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              M: 12
              Text: Dec2019
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              Y: 2019
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