Study of the impact of resonant magnetic perturbation fields on gross tungsten erosion using DiMES samples in DIII-D

E. T. Hinson; O. Schmitz; H. Frerichs; T. Abrams; A. Briesemeister; D. L. Rudakov; E. A. Unterberg; W. R. Wampler; J. G. Watkins; H. Q. Wang

doi:10.1088/1402-4896/aa9002

Study of the impact of resonant magnetic perturbation fields on gross tungsten erosion using DiMES samples in DIII-D

E. T. Hinson, O. Schmitz, H. Frerichs, T. Abrams, A. Briesemeister, D. L. Rudakov, E. A. Unterberg, W. R. Wampler, J. G. Watkins, H. Q. Wang

Power Exhaust and Particle Control

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Abstract

An experiment was conducted in DIII-D to compare gross tungsten (W) erosion on samples exposed to outer strike point (OSP) sweeps in L-mode plasmas for three conditions. These included two phases of resonant magnetic perturbations (RMPs), and a set with no perturbations. Upon RMP application, lobe structures indicative of strike point splitting of the OSP were evident in divertor camera data and on Langmuir probes. Gross W erosion flux, GW, inferred spectroscopically using the S/XB method applied to the 400.9 nm W-I line, was generally in the range Γ_W/Γ_{D +,⊥} = 2 × 10^-4 referenced to incident deuterium ion flux Γ_D+,⊥, and was increased in the RMP cases by no more than 30% of the level observed in unperturbed discharges. A large reduction in gross erosion (50%) was observed in the private flux region at the W sample for one specific toroidal phase of the RMP field.

Original language	English
Article number	014048
Journal	Physica Scripta
Volume	2017
Issue number	T170
DOIs	https://doi.org/10.1088/1402-4896/aa9002
State	Published - Dec 1 2017
Event	16th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2017 - Neuss/Dusseldorf, Germany Duration: May 16 2017 → May 19 2017

Funding

This material is based upon work supported by the US Department of Energy, Office of Science, Office of Fusion Energy Sciences, using the DIII-D National Fusion Facility, a DOE Office of Science user facility, under Awards DE-FC02-04ER54698. Work also supported by US DOE DESC0013911, DE-FC02-04ER54698, DE-FG02-07ER54917, DE-AC05-00OR22725, and DE-AC04-94AL85000. DIII-D data shown in this paper can be obtained in digital format by following the links at https://fusion.gat.com/global/D3D_DMP.

Keywords

ITER
Plasma material interactions
Resonant magnetic perturbations
Tungsten erosion

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1088/1402-4896/aa9002

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title = "Study of the impact of resonant magnetic perturbation fields on gross tungsten erosion using DiMES samples in DIII-D",

abstract = "An experiment was conducted in DIII-D to compare gross tungsten (W) erosion on samples exposed to outer strike point (OSP) sweeps in L-mode plasmas for three conditions. These included two phases of resonant magnetic perturbations (RMPs), and a set with no perturbations. Upon RMP application, lobe structures indicative of strike point splitting of the OSP were evident in divertor camera data and on Langmuir probes. Gross W erosion flux, GW, inferred spectroscopically using the S/XB method applied to the 400.9 nm W-I line, was generally in the range ΓW/ΓD +,⊥ = 2 × 10-4 referenced to incident deuterium ion flux ΓD+,⊥, and was increased in the RMP cases by no more than 30% of the level observed in unperturbed discharges. A large reduction in gross erosion (50%) was observed in the private flux region at the W sample for one specific toroidal phase of the RMP field.",

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AU - Hinson, E. T.

AU - Schmitz, O.

AU - Frerichs, H.

AU - Abrams, T.

AU - Briesemeister, A.

AU - Rudakov, D. L.

AU - Unterberg, E. A.

AU - Wampler, W. R.

AU - Watkins, J. G.

AU - Wang, H. Q.

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N2 - An experiment was conducted in DIII-D to compare gross tungsten (W) erosion on samples exposed to outer strike point (OSP) sweeps in L-mode plasmas for three conditions. These included two phases of resonant magnetic perturbations (RMPs), and a set with no perturbations. Upon RMP application, lobe structures indicative of strike point splitting of the OSP were evident in divertor camera data and on Langmuir probes. Gross W erosion flux, GW, inferred spectroscopically using the S/XB method applied to the 400.9 nm W-I line, was generally in the range ΓW/ΓD +,⊥ = 2 × 10-4 referenced to incident deuterium ion flux ΓD+,⊥, and was increased in the RMP cases by no more than 30% of the level observed in unperturbed discharges. A large reduction in gross erosion (50%) was observed in the private flux region at the W sample for one specific toroidal phase of the RMP field.

AB - An experiment was conducted in DIII-D to compare gross tungsten (W) erosion on samples exposed to outer strike point (OSP) sweeps in L-mode plasmas for three conditions. These included two phases of resonant magnetic perturbations (RMPs), and a set with no perturbations. Upon RMP application, lobe structures indicative of strike point splitting of the OSP were evident in divertor camera data and on Langmuir probes. Gross W erosion flux, GW, inferred spectroscopically using the S/XB method applied to the 400.9 nm W-I line, was generally in the range ΓW/ΓD +,⊥ = 2 × 10-4 referenced to incident deuterium ion flux ΓD+,⊥, and was increased in the RMP cases by no more than 30% of the level observed in unperturbed discharges. A large reduction in gross erosion (50%) was observed in the private flux region at the W sample for one specific toroidal phase of the RMP field.

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KW - Plasma material interactions

KW - Resonant magnetic perturbations

KW - Tungsten erosion

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ER -

Study of the impact of resonant magnetic perturbation fields on gross tungsten erosion using DiMES samples in DIII-D

Abstract

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Keywords

UN SDGs

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