ASCOT modelling of ripple effects on toroidal torque

A. 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

A. Salmi (Corresponding Author), T. Johnson, V. Parail, Jukka A. Heikkinen, V. Hynönen, T. P. Kiviniemi, T. Kurki-Suonio, JET-EFDA contributors

VTT Technical Research Centre of Finland

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

15 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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@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 = "A. 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 = "Wiley-VCH Verlag",

number = "1-3",

}

TY - JOUR

T1 - ASCOT modelling of ripple effects on toroidal torque

AU - Salmi, A.

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

VL - 48

SP - 77

EP - 81

JO - Contributions to Plasma Physics

JF - Contributions to Plasma Physics

SN - 0863-1042

IS - 1-3

ER -