Modification of sawtooth oscillations with ICRF waves in the JET tokamak

M. J. Mantsinen; B. Alper; C. Angioni; R. Buttery; S. Coda; L. G. Eriksson; J. P. Graves; T. Hellsten; D. Howell; L. C. Ingesson; T. Johnson; V. Kiptily; M. Lennholm; M. L. Mayoral; A. Mueck; F. Nabais; F. Nave; J. M. Noterdaeme; J. Ongena; O. Sauter; S. E. Sharapov; E. Westerhof

doi:10.1063/1.2800510

Modification of sawtooth oscillations with ICRF waves in the JET tokamak

M. J. Mantsinen, B. Alper, C. Angioni, R. Buttery, S. Coda, L. G. Eriksson, J. P. Graves, T. Hellsten, D. Howell, L. C. Ingesson, T. Johnson, V. Kiptily, M. Lennholm, M. L. Mayoral, A. Mueck, F. Nabais, F. Nave, J. M. Noterdaeme, J. Ongena, O. SauterS. E. Sharapov, E. Westerhof

Laboratory for Plasma Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Methods of modifying sawtooth oscillations using waves in the ion cyclotron range of frequencies (ICRF) in the JET tokamak are presented. Examples of sawtooth stabilization by ICRF-accelerated high-energy ions are shown, including experiments with ICRF-acceleration of ⁴He-beam ions to simulate the effects of fusion born alpha particles. With high power ICRF heating in low-density plasmas, fast ion stabilization of sawteeth is lost and a new type of small-period and small-amplitude sawteeth appears. ICRF-induced radial pinch with toroidally asymmetric waves is found to be useful in affecting the radial profile of the ICRF-driven fast ion populations and thereby their influence on sawteeth. Ion cyclotron current drive (ICCD) applied close to the sawtooth inversion radius is effective in modifying the sawtooth period. The latest achievements include the successful application of ICCD to shorten the fast-ion-induced long-period sawteeth and thereby avoid triggering of neoclassical tearing modes (NTMs).

Original language	English
Title of host publication	RADIO FREQUENCY POWER IN PLASMAS
Subtitle of host publication	17th Topical Conference on Radio Frequency Power in Plasmas
Pages	35-42
Number of pages	8
DOIs	https://doi.org/10.1063/1.2800510
Publication status	Published - 2007
Event	17th Topical Conference on Radio Frequency Power in Plasmas - Clearwater, FL, United States Duration: 7 May 2007 → 9 May 2007

Publication series

Name	AIP Conference Proceedings
Volume	933
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	17th Topical Conference on Radio Frequency Power in Plasmas
Country/Territory	United States
City	Clearwater, FL
Period	7/05/07 → 9/05/07

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10.1063/1.2800510

Cite this

Mantsinen, M. J., Alper, B., Angioni, C., Buttery, R., Coda, S., Eriksson, L. G., Graves, J. P., Hellsten, T., Howell, D., Ingesson, L. C., Johnson, T., Kiptily, V., Lennholm, M., Mayoral, M. L., Mueck, A., Nabais, F., Nave, F., Noterdaeme, J. M., Ongena, J., ... Westerhof, E. (2007). Modification of sawtooth oscillations with ICRF waves in the JET tokamak. In RADIO FREQUENCY POWER IN PLASMAS: 17th Topical Conference on Radio Frequency Power in Plasmas (pp. 35-42). (AIP Conference Proceedings; Vol. 933). https://doi.org/10.1063/1.2800510

@inproceedings{3ac0a440d55c489db39a113b611beb6e,

title = "Modification of sawtooth oscillations with ICRF waves in the JET tokamak",

abstract = "Methods of modifying sawtooth oscillations using waves in the ion cyclotron range of frequencies (ICRF) in the JET tokamak are presented. Examples of sawtooth stabilization by ICRF-accelerated high-energy ions are shown, including experiments with ICRF-acceleration of 4He-beam ions to simulate the effects of fusion born alpha particles. With high power ICRF heating in low-density plasmas, fast ion stabilization of sawteeth is lost and a new type of small-period and small-amplitude sawteeth appears. ICRF-induced radial pinch with toroidally asymmetric waves is found to be useful in affecting the radial profile of the ICRF-driven fast ion populations and thereby their influence on sawteeth. Ion cyclotron current drive (ICCD) applied close to the sawtooth inversion radius is effective in modifying the sawtooth period. The latest achievements include the successful application of ICCD to shorten the fast-ion-induced long-period sawteeth and thereby avoid triggering of neoclassical tearing modes (NTMs).",

author = "Mantsinen, {M. J.} and B. Alper and C. Angioni and R. Buttery and S. Coda and Eriksson, {L. G.} and Graves, {J. P.} and T. Hellsten and D. Howell and Ingesson, {L. C.} and T. Johnson and V. Kiptily and M. Lennholm and Mayoral, {M. L.} and A. Mueck and F. Nabais and F. Nave and Noterdaeme, {J. M.} and J. Ongena and O. Sauter and Sharapov, {S. E.} and E. Westerhof",

year = "2007",

doi = "10.1063/1.2800510",

language = "English",

isbn = "0735404445",

series = "AIP Conference Proceedings",

pages = "35--42",

booktitle = "RADIO FREQUENCY POWER IN PLASMAS",

note = "17th Topical Conference on Radio Frequency Power in Plasmas ; Conference date: 07-05-2007 Through 09-05-2007",

}

Mantsinen, MJ, Alper, B, Angioni, C, Buttery, R, Coda, S, Eriksson, LG, Graves, JP, Hellsten, T, Howell, D, Ingesson, LC, Johnson, T, Kiptily, V, Lennholm, M, Mayoral, ML, Mueck, A, Nabais, F, Nave, F, Noterdaeme, JM, Ongena, J, Sauter, O, Sharapov, SE & Westerhof, E 2007, Modification of sawtooth oscillations with ICRF waves in the JET tokamak. in RADIO FREQUENCY POWER IN PLASMAS: 17th Topical Conference on Radio Frequency Power in Plasmas. AIP Conference Proceedings, vol. 933, pp. 35-42, 17th Topical Conference on Radio Frequency Power in Plasmas, Clearwater, FL, United States, 7/05/07. https://doi.org/10.1063/1.2800510

Modification of sawtooth oscillations with ICRF waves in the JET tokamak. / Mantsinen, M. J.; Alper, B.; Angioni, C. et al.
RADIO FREQUENCY POWER IN PLASMAS: 17th Topical Conference on Radio Frequency Power in Plasmas. 2007. p. 35-42 (AIP Conference Proceedings; Vol. 933).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Modification of sawtooth oscillations with ICRF waves in the JET tokamak

AU - Mantsinen, M. J.

AU - Alper, B.

AU - Angioni, C.

AU - Buttery, R.

AU - Coda, S.

AU - Eriksson, L. G.

AU - Graves, J. P.

AU - Hellsten, T.

AU - Howell, D.

AU - Ingesson, L. C.

AU - Johnson, T.

AU - Kiptily, V.

AU - Lennholm, M.

AU - Mayoral, M. L.

AU - Mueck, A.

AU - Nabais, F.

AU - Nave, F.

AU - Noterdaeme, J. M.

AU - Ongena, J.

AU - Sauter, O.

AU - Sharapov, S. E.

AU - Westerhof, E.

PY - 2007

Y1 - 2007

N2 - Methods of modifying sawtooth oscillations using waves in the ion cyclotron range of frequencies (ICRF) in the JET tokamak are presented. Examples of sawtooth stabilization by ICRF-accelerated high-energy ions are shown, including experiments with ICRF-acceleration of 4He-beam ions to simulate the effects of fusion born alpha particles. With high power ICRF heating in low-density plasmas, fast ion stabilization of sawteeth is lost and a new type of small-period and small-amplitude sawteeth appears. ICRF-induced radial pinch with toroidally asymmetric waves is found to be useful in affecting the radial profile of the ICRF-driven fast ion populations and thereby their influence on sawteeth. Ion cyclotron current drive (ICCD) applied close to the sawtooth inversion radius is effective in modifying the sawtooth period. The latest achievements include the successful application of ICCD to shorten the fast-ion-induced long-period sawteeth and thereby avoid triggering of neoclassical tearing modes (NTMs).

AB - Methods of modifying sawtooth oscillations using waves in the ion cyclotron range of frequencies (ICRF) in the JET tokamak are presented. Examples of sawtooth stabilization by ICRF-accelerated high-energy ions are shown, including experiments with ICRF-acceleration of 4He-beam ions to simulate the effects of fusion born alpha particles. With high power ICRF heating in low-density plasmas, fast ion stabilization of sawteeth is lost and a new type of small-period and small-amplitude sawteeth appears. ICRF-induced radial pinch with toroidally asymmetric waves is found to be useful in affecting the radial profile of the ICRF-driven fast ion populations and thereby their influence on sawteeth. Ion cyclotron current drive (ICCD) applied close to the sawtooth inversion radius is effective in modifying the sawtooth period. The latest achievements include the successful application of ICCD to shorten the fast-ion-induced long-period sawteeth and thereby avoid triggering of neoclassical tearing modes (NTMs).

UR - http://www.scopus.com/inward/record.url?scp=36849037305&partnerID=8YFLogxK

U2 - 10.1063/1.2800510

DO - 10.1063/1.2800510

M3 - Conference contribution

AN - SCOPUS:36849037305

SN - 0735404445

SN - 9780735404441

T3 - AIP Conference Proceedings

SP - 35

EP - 42

BT - RADIO FREQUENCY POWER IN PLASMAS

T2 - 17th Topical Conference on Radio Frequency Power in Plasmas

Y2 - 7 May 2007 through 9 May 2007

ER -

Modification of sawtooth oscillations with ICRF waves in the JET tokamak

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