Controlling the internal transport barrier oscillations in high-performance tokamak plasmas with a dominant fraction of bootstrap current

J. Bizarro, X. Litaudon, Tuomas Tala

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)

Abstract

It is shown that relaxation oscillations associated with repetitive internal transport barrier (ITB) buildup and collapse in high-performance, overdriven tokamak plasmas, with ion-cyclotron resonance heating (ICRH), neutral-beam injection (NBI) and lower-hybrid current drive (LHCD), and with a dominant fraction of bootstrap current, can be overcome if the LHCD power is sufficiently high. This result has been obtained using a benchmarked, fully predictive transport model iterated with given ICRH profiles and self-consistently with NBI and LHCD modules, the stabilizing role of the E × B flow shear being combined with that of reversed magnetic shear in the simulation of ITB dynamics.
Original languageEnglish
Pages (from-to)L41-L45
JournalNuclear Fusion
Volume47
Issue number11
DOIs
Publication statusPublished - 2007
MoE publication typeA1 Journal article-refereed

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oscillations
beam injection
neutral beams
cyclotron resonance
heating
shear flow
ions
modules
shear
profiles
simulation

Cite this

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title = "Controlling the internal transport barrier oscillations in high-performance tokamak plasmas with a dominant fraction of bootstrap current",
abstract = "It is shown that relaxation oscillations associated with repetitive internal transport barrier (ITB) buildup and collapse in high-performance, overdriven tokamak plasmas, with ion-cyclotron resonance heating (ICRH), neutral-beam injection (NBI) and lower-hybrid current drive (LHCD), and with a dominant fraction of bootstrap current, can be overcome if the LHCD power is sufficiently high. This result has been obtained using a benchmarked, fully predictive transport model iterated with given ICRH profiles and self-consistently with NBI and LHCD modules, the stabilizing role of the E × B flow shear being combined with that of reversed magnetic shear in the simulation of ITB dynamics.",
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Controlling the internal transport barrier oscillations in high-performance tokamak plasmas with a dominant fraction of bootstrap current. / Bizarro, J.; Litaudon, X.; Tala, Tuomas.

In: Nuclear Fusion, Vol. 47, No. 11, 2007, p. L41-L45.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Controlling the internal transport barrier oscillations in high-performance tokamak plasmas with a dominant fraction of bootstrap current

AU - Bizarro, J.

AU - Litaudon, X.

AU - Tala, Tuomas

PY - 2007

Y1 - 2007

N2 - It is shown that relaxation oscillations associated with repetitive internal transport barrier (ITB) buildup and collapse in high-performance, overdriven tokamak plasmas, with ion-cyclotron resonance heating (ICRH), neutral-beam injection (NBI) and lower-hybrid current drive (LHCD), and with a dominant fraction of bootstrap current, can be overcome if the LHCD power is sufficiently high. This result has been obtained using a benchmarked, fully predictive transport model iterated with given ICRH profiles and self-consistently with NBI and LHCD modules, the stabilizing role of the E × B flow shear being combined with that of reversed magnetic shear in the simulation of ITB dynamics.

AB - It is shown that relaxation oscillations associated with repetitive internal transport barrier (ITB) buildup and collapse in high-performance, overdriven tokamak plasmas, with ion-cyclotron resonance heating (ICRH), neutral-beam injection (NBI) and lower-hybrid current drive (LHCD), and with a dominant fraction of bootstrap current, can be overcome if the LHCD power is sufficiently high. This result has been obtained using a benchmarked, fully predictive transport model iterated with given ICRH profiles and self-consistently with NBI and LHCD modules, the stabilizing role of the E × B flow shear being combined with that of reversed magnetic shear in the simulation of ITB dynamics.

U2 - 10.1088/0029-5515/47/11/L03

DO - 10.1088/0029-5515/47/11/L03

M3 - Article

VL - 47

SP - L41-L45

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

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ER -