Heavy impurity transport in tokamaks subject to plasma rotation, NTV and the influence of saturated ideal MHD perturbations

JET contributors; E. Lascas Neto; J. P. Graves; M. Raghunathan; C. Sommariva; D. Pfefferlé

doi:10.1088/1361-6587/ac3964

Heavy impurity transport in tokamaks subject to plasma rotation, NTV and the influence of saturated ideal MHD perturbations

JET contributors, E. Lascas Neto, J. P. Graves, M. Raghunathan, C. Sommariva, D. Pfefferlé

Mathematics and Statistics

Research output: Contribution to journal › Conference article › peer-review

2 Citations (Scopus)

Abstract

Strongly peaked tungsten accumulation is a common feature of high performance plasma scenarios in JET with the ITER-like wall, particularly during MHD activity induced by continuous modes. This study investigates the effect of long living internal kink modes on heavy impurity transport in the presence of strong flows and NTV ambipolar electric field. A novel formulation which includes these effects is presented and applied in the VENUS-LEVIS code in order to follow tungsten ions in a saturated JET-like internal kinked toroidally rotating plasma configuration. The synergy between 3D magnetic fields, strong flows and NTV is seen to cause tungsten accumulation in contrast to what is observed in similar axisymmetric configurations. Rapid inward transport of impurities in JET plasmas following the triggering of continuous modes is explained by the work presented here, and we use the same theory to postulate why outward transport can occur in kinked ASDEX-U plasmas.

Original language	English
Article number	014002
Journal	Plasma Physics and Controlled Fusion
Volume	64
Issue number	1
DOIs	https://doi.org/10.1088/1361-6587/ac3964
Publication status	Published - Jan 2022
Event	2020 Joint Varenna-Lausanne International Workshop on the Theory of Fusion Plasmas - SPC-EPFL, Lausanne, Switzerland Duration: 12 Oct 2020 → 16 Oct 2020

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title = "Heavy impurity transport in tokamaks subject to plasma rotation, NTV and the influence of saturated ideal MHD perturbations",

abstract = "Strongly peaked tungsten accumulation is a common feature of high performance plasma scenarios in JET with the ITER-like wall, particularly during MHD activity induced by continuous modes. This study investigates the effect of long living internal kink modes on heavy impurity transport in the presence of strong flows and NTV ambipolar electric field. A novel formulation which includes these effects is presented and applied in the VENUS-LEVIS code in order to follow tungsten ions in a saturated JET-like internal kinked toroidally rotating plasma configuration. The synergy between 3D magnetic fields, strong flows and NTV is seen to cause tungsten accumulation in contrast to what is observed in similar axisymmetric configurations. Rapid inward transport of impurities in JET plasmas following the triggering of continuous modes is explained by the work presented here, and we use the same theory to postulate why outward transport can occur in kinked ASDEX-U plasmas.",

keywords = "3D flows, heavy impurities, internal kink, MHD",

author = "{JET contributors} and {Lascas Neto}, E. and Graves, {J. P.} and M. Raghunathan and C. Sommariva and D. Pfefferl{\'e}",

note = "Publisher Copyright: {\textcopyright} 2021 IOP Publishing Ltd.; 2020 Joint Varenna-Lausanne International Workshop on the Theory of Fusion Plasmas ; Conference date: 12-10-2020 Through 16-10-2020",

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doi = "10.1088/1361-6587/ac3964",

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T1 - Heavy impurity transport in tokamaks subject to plasma rotation, NTV and the influence of saturated ideal MHD perturbations

AU - JET contributors

AU - Lascas Neto, E.

AU - Graves, J. P.

AU - Raghunathan, M.

AU - Sommariva, C.

AU - Pfefferlé, D.

PY - 2022/1

Y1 - 2022/1

N2 - Strongly peaked tungsten accumulation is a common feature of high performance plasma scenarios in JET with the ITER-like wall, particularly during MHD activity induced by continuous modes. This study investigates the effect of long living internal kink modes on heavy impurity transport in the presence of strong flows and NTV ambipolar electric field. A novel formulation which includes these effects is presented and applied in the VENUS-LEVIS code in order to follow tungsten ions in a saturated JET-like internal kinked toroidally rotating plasma configuration. The synergy between 3D magnetic fields, strong flows and NTV is seen to cause tungsten accumulation in contrast to what is observed in similar axisymmetric configurations. Rapid inward transport of impurities in JET plasmas following the triggering of continuous modes is explained by the work presented here, and we use the same theory to postulate why outward transport can occur in kinked ASDEX-U plasmas.

AB - Strongly peaked tungsten accumulation is a common feature of high performance plasma scenarios in JET with the ITER-like wall, particularly during MHD activity induced by continuous modes. This study investigates the effect of long living internal kink modes on heavy impurity transport in the presence of strong flows and NTV ambipolar electric field. A novel formulation which includes these effects is presented and applied in the VENUS-LEVIS code in order to follow tungsten ions in a saturated JET-like internal kinked toroidally rotating plasma configuration. The synergy between 3D magnetic fields, strong flows and NTV is seen to cause tungsten accumulation in contrast to what is observed in similar axisymmetric configurations. Rapid inward transport of impurities in JET plasmas following the triggering of continuous modes is explained by the work presented here, and we use the same theory to postulate why outward transport can occur in kinked ASDEX-U plasmas.

KW - 3D flows

KW - heavy impurities

KW - internal kink

KW - MHD

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U2 - 10.1088/1361-6587/ac3964

DO - 10.1088/1361-6587/ac3964

M3 - Conference article

AN - SCOPUS:85122464608

SN - 0741-3335

VL - 64

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 1

M1 - 014002

T2 - 2020 Joint Varenna-Lausanne International Workshop on the Theory of Fusion Plasmas

Y2 - 12 October 2020 through 16 October 2020

ER -

Heavy impurity transport in tokamaks subject to plasma rotation, NTV and the influence of saturated ideal MHD perturbations

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