ASCOT modelling of ripple effects on toroidal torque

Antti Salmi; T. Johnson; V. Parail; Jukka A. Heikkinen; V. Hynönen; T. P. Kiviniemi; T. Kurki-Suonio; JET-EFDA contributors

doi:10.1002/ctpp.200810013

ASCOT modelling of ripple effects on toroidal torque

Antti Salmi^*, T. Johnson, V. Parail, Jukka A. Heikkinen, V. Hynönen, T. P. Kiviniemi, T. Kurki-Suonio, JET-EFDA contributors

^*Corresponding author for this work

VTT Technical Research Centre of Finland

Research output: Contribution to journal › Article › Scientific › peer-review

17 Citations (Scopus)

Abstract

Toroidal field ripple, δ =(B_max ‐B_min)/(Bm_ax +B_min), in ITER will be relatively large, about 0.5% at the outer midplane. Due to the importance of toroidal rotation on plasma stability and confinement it is important to understand the consequences of a non-negligible ripple field on rotation. Guiding centre following Monte Carlo code ASCOT is used to evaluate the torque on plasma from co-current NBI in presence of toroidal magnetic field ripple. Simulations are made for a JET discharge from 2007 Ripple Campaign aimed to clarify the effect of ripple on fusion plasmas in preparation for ITER. ASCOT results show large reduction of torque from co-NBI and negative torque from thermal ions, which together could create a counter rotating edge plasma.

Original language	English
Pages (from-to)	77-81
Journal	Contributions to Plasma Physics
Volume	48
Issue number	1-3
DOIs	https://doi.org/10.1002/ctpp.200810013
Publication status	Published - 2008
MoE publication type	A1 Journal article-refereed

Keywords

MC
GC orbit following
ripple
torque

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10.1002/ctpp.200810013

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@article{72ebd06082674f45bfdf642cdcb84974,

title = "ASCOT modelling of ripple effects on toroidal torque",

abstract = "Toroidal field ripple, δ =(Bmax ‐Bmin)/(Bmax +Bmin), in ITER will be relatively large, about 0.5% at the outer midplane. Due to the importance of toroidal rotation on plasma stability and confinement it is important to understand the consequences of a non-negligible ripple field on rotation. Guiding centre following Monte Carlo code ASCOT is used to evaluate the torque on plasma from co-current NBI in presence of toroidal magnetic field ripple. Simulations are made for a JET discharge from 2007 Ripple Campaign aimed to clarify the effect of ripple on fusion plasmas in preparation for ITER. ASCOT results show large reduction of torque from co-NBI and negative torque from thermal ions, which together could create a counter rotating edge plasma.",

keywords = "MC, GC orbit following, ripple, torque",

author = "Antti Salmi and T. Johnson and V. Parail and Heikkinen, {Jukka A.} and V. Hyn{\"o}nen and Kiviniemi, {T. P.} and T. Kurki-Suonio and {JET-EFDA contributors}",

year = "2008",

doi = "10.1002/ctpp.200810013",

language = "English",

volume = "48",

pages = "77--81",

journal = "Contributions to Plasma Physics",

issn = "0863-1042",

publisher = "John Wiley & Sons Inc.",

number = "1-3",

}

TY - JOUR

T1 - ASCOT modelling of ripple effects on toroidal torque

AU - Salmi, Antti

AU - Johnson, T.

AU - Parail, V.

AU - Heikkinen, Jukka A.

AU - Hynönen, V.

AU - Kiviniemi, T. P.

AU - Kurki-Suonio, T.

AU - JET-EFDA contributors

PY - 2008

Y1 - 2008

N2 - Toroidal field ripple, δ =(Bmax ‐Bmin)/(Bmax +Bmin), in ITER will be relatively large, about 0.5% at the outer midplane. Due to the importance of toroidal rotation on plasma stability and confinement it is important to understand the consequences of a non-negligible ripple field on rotation. Guiding centre following Monte Carlo code ASCOT is used to evaluate the torque on plasma from co-current NBI in presence of toroidal magnetic field ripple. Simulations are made for a JET discharge from 2007 Ripple Campaign aimed to clarify the effect of ripple on fusion plasmas in preparation for ITER. ASCOT results show large reduction of torque from co-NBI and negative torque from thermal ions, which together could create a counter rotating edge plasma.

AB - Toroidal field ripple, δ =(Bmax ‐Bmin)/(Bmax +Bmin), in ITER will be relatively large, about 0.5% at the outer midplane. Due to the importance of toroidal rotation on plasma stability and confinement it is important to understand the consequences of a non-negligible ripple field on rotation. Guiding centre following Monte Carlo code ASCOT is used to evaluate the torque on plasma from co-current NBI in presence of toroidal magnetic field ripple. Simulations are made for a JET discharge from 2007 Ripple Campaign aimed to clarify the effect of ripple on fusion plasmas in preparation for ITER. ASCOT results show large reduction of torque from co-NBI and negative torque from thermal ions, which together could create a counter rotating edge plasma.

KW - MC

KW - GC orbit following

KW - ripple

KW - torque

U2 - 10.1002/ctpp.200810013

DO - 10.1002/ctpp.200810013

M3 - Article

SN - 0863-1042

VL - 48

SP - 77

EP - 81

JO - Contributions to Plasma Physics

JF - Contributions to Plasma Physics

IS - 1-3

ER -

ASCOT modelling of ripple effects on toroidal torque

Abstract

Keywords

UN SDGs

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