Fast response in the ripple trapped ion distribution to abrupt changes in a radial electric field in Tokamaks

Jukka A. Heikkinen, W. Herrmann, Taina Kurki-Suonio

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

In the absence of a radial electric field Er, there is a large deficit in the number of energetic deeply ripple blocked ions near the outer edge of a tokamak. It is shown numerically that the deficit is rapidly filled (in <100 μs) by the onset of an inward Er and that the filling results from modifications in the ion drift orbits, connecting the inner undepleted regions to the nearly empty ripple loss region. The increase in the neutral particle flux from the ripple blocked ions, observed at an L-H transition, is reproduced using two independent numerical methods by turning on a large Er.
Original languageEnglish
Pages (from-to)419-424
JournalNuclear Fusion
Volume38
Issue number3
DOIs
Publication statusPublished - 1998
MoE publication typeA1 Journal article-refereed

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ion distribution
ripples
electric fields
ions
neutral particles
flux (rate)
orbits

Cite this

Heikkinen, Jukka A. ; Herrmann, W. ; Kurki-Suonio, Taina. / Fast response in the ripple trapped ion distribution to abrupt changes in a radial electric field in Tokamaks. In: Nuclear Fusion. 1998 ; Vol. 38, No. 3. pp. 419-424.
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Fast response in the ripple trapped ion distribution to abrupt changes in a radial electric field in Tokamaks. / Heikkinen, Jukka A.; Herrmann, W.; Kurki-Suonio, Taina.

In: Nuclear Fusion, Vol. 38, No. 3, 1998, p. 419-424.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Fast response in the ripple trapped ion distribution to abrupt changes in a radial electric field in Tokamaks

AU - Heikkinen, Jukka A.

AU - Herrmann, W.

AU - Kurki-Suonio, Taina

PY - 1998

Y1 - 1998

N2 - In the absence of a radial electric field Er, there is a large deficit in the number of energetic deeply ripple blocked ions near the outer edge of a tokamak. It is shown numerically that the deficit is rapidly filled (in <100 μs) by the onset of an inward Er and that the filling results from modifications in the ion drift orbits, connecting the inner undepleted regions to the nearly empty ripple loss region. The increase in the neutral particle flux from the ripple blocked ions, observed at an L-H transition, is reproduced using two independent numerical methods by turning on a large Er.

AB - In the absence of a radial electric field Er, there is a large deficit in the number of energetic deeply ripple blocked ions near the outer edge of a tokamak. It is shown numerically that the deficit is rapidly filled (in <100 μs) by the onset of an inward Er and that the filling results from modifications in the ion drift orbits, connecting the inner undepleted regions to the nearly empty ripple loss region. The increase in the neutral particle flux from the ripple blocked ions, observed at an L-H transition, is reproduced using two independent numerical methods by turning on a large Er.

U2 - 10.1088/0029-5515/38/3/308

DO - 10.1088/0029-5515/38/3/308

M3 - Article

VL - 38

SP - 419

EP - 424

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

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ER -