Bright spots generated by lower hybrid waves on JET

Karin M. Rantamäki, V. Petrzilka, P. Andrew, I. Coffey, A. Ekedahl, K. Erents, V. Fuchs, M. Goniche, G. Granucci, E. Joffrin, Seppo Karttunen, P. Lomas, J. Mailloux, M. Mantsinen, M-L. Mayoral, D.C. McDonald, J.-M. Noterdaeme, V. Parail, A.A. Tuccillo, F. Zacek & 1 others JET-EFDA Contributors

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)

Abstract

Observations of bright spots on the JET divertor aprons during lower hybrid current drive experiments are described. These bright spots are important because they can potentially cause damage to large tokamaks. The bright spots arise due to the impact of a fast particle beam. This beam originates from the front of the lower hybrid launcher, where thermal particles are accelerated according to theory by interaction with the high spatial harmonics of the lower hybrid wave. The bright spots are clearly related to the lower hybrid power as they disappear when the lower hybrid power is switched off. According to the analysis versus various parameters, the brightness of the spots clearly decreases with increasing plasma–wall distance, i.e. the distance between the last closed flux surface and the poloidal limiter. This is clearly beneficial for ITER, as it is designed to operate at a large plasma–wall distance.
Original languageEnglish
Pages (from-to)1101 - 1108
Number of pages8
JournalPlasma Physics and Controlled Fusion
Volume47
Issue number7
DOIs
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

Fingerprint

Particle beams
Limiters
Luminance
Fluxes
launchers
Experiments
particle beams
brightness
damage
harmonics
causes
Hot Temperature
interactions

Keywords

  • JET
  • plasma
  • fusion energy
  • fusion reactors
  • tokamak
  • ITER
  • lower hybrid current drive
  • divertor
  • divertor tiles
  • first wall
  • plasma-wall interactions

Cite this

Rantamäki, K. M., Petrzilka, V., Andrew, P., Coffey, I., Ekedahl, A., Erents, K., ... JET-EFDA Contributors (2005). Bright spots generated by lower hybrid waves on JET. Plasma Physics and Controlled Fusion, 47(7), 1101 - 1108. https://doi.org/10.1088/0741-3335/47/7/009
Rantamäki, Karin M. ; Petrzilka, V. ; Andrew, P. ; Coffey, I. ; Ekedahl, A. ; Erents, K. ; Fuchs, V. ; Goniche, M. ; Granucci, G. ; Joffrin, E. ; Karttunen, Seppo ; Lomas, P. ; Mailloux, J. ; Mantsinen, M. ; Mayoral, M-L. ; McDonald, D.C. ; Noterdaeme, J.-M. ; Parail, V. ; Tuccillo, A.A. ; Zacek, F. ; JET-EFDA Contributors. / Bright spots generated by lower hybrid waves on JET. In: Plasma Physics and Controlled Fusion. 2005 ; Vol. 47, No. 7. pp. 1101 - 1108.
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title = "Bright spots generated by lower hybrid waves on JET",
abstract = "Observations of bright spots on the JET divertor aprons during lower hybrid current drive experiments are described. These bright spots are important because they can potentially cause damage to large tokamaks. The bright spots arise due to the impact of a fast particle beam. This beam originates from the front of the lower hybrid launcher, where thermal particles are accelerated according to theory by interaction with the high spatial harmonics of the lower hybrid wave. The bright spots are clearly related to the lower hybrid power as they disappear when the lower hybrid power is switched off. According to the analysis versus various parameters, the brightness of the spots clearly decreases with increasing plasma–wall distance, i.e. the distance between the last closed flux surface and the poloidal limiter. This is clearly beneficial for ITER, as it is designed to operate at a large plasma–wall distance.",
keywords = "JET, plasma, fusion energy, fusion reactors, tokamak, ITER, lower hybrid current drive, divertor, divertor tiles, first wall, plasma-wall interactions",
author = "Rantam{\"a}ki, {Karin M.} and V. Petrzilka and P. Andrew and I. Coffey and A. Ekedahl and K. Erents and V. Fuchs and M. Goniche and G. Granucci and E. Joffrin and Seppo Karttunen and P. Lomas and J. Mailloux and M. Mantsinen and M-L. Mayoral and D.C. McDonald and J.-M. Noterdaeme and V. Parail and A.A. Tuccillo and F. Zacek and {JET-EFDA Contributors}",
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doi = "10.1088/0741-3335/47/7/009",
language = "English",
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Rantamäki, KM, Petrzilka, V, Andrew, P, Coffey, I, Ekedahl, A, Erents, K, Fuchs, V, Goniche, M, Granucci, G, Joffrin, E, Karttunen, S, Lomas, P, Mailloux, J, Mantsinen, M, Mayoral, M-L, McDonald, DC, Noterdaeme, J-M, Parail, V, Tuccillo, AA, Zacek, F & JET-EFDA Contributors 2005, 'Bright spots generated by lower hybrid waves on JET', Plasma Physics and Controlled Fusion, vol. 47, no. 7, pp. 1101 - 1108. https://doi.org/10.1088/0741-3335/47/7/009

Bright spots generated by lower hybrid waves on JET. / Rantamäki, Karin M.; Petrzilka, V.; Andrew, P.; Coffey, I.; Ekedahl, A.; Erents, K.; Fuchs, V.; Goniche, M.; Granucci, G.; Joffrin, E.; Karttunen, Seppo; Lomas, P.; Mailloux, J.; Mantsinen, M.; Mayoral, M-L.; McDonald, D.C.; Noterdaeme, J.-M.; Parail, V.; Tuccillo, A.A.; Zacek, F.; JET-EFDA Contributors.

In: Plasma Physics and Controlled Fusion, Vol. 47, No. 7, 2005, p. 1101 - 1108.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Bright spots generated by lower hybrid waves on JET

AU - Rantamäki, Karin M.

AU - Petrzilka, V.

AU - Andrew, P.

AU - Coffey, I.

AU - Ekedahl, A.

AU - Erents, K.

AU - Fuchs, V.

AU - Goniche, M.

AU - Granucci, G.

AU - Joffrin, E.

AU - Karttunen, Seppo

AU - Lomas, P.

AU - Mailloux, J.

AU - Mantsinen, M.

AU - Mayoral, M-L.

AU - McDonald, D.C.

AU - Noterdaeme, J.-M.

AU - Parail, V.

AU - Tuccillo, A.A.

AU - Zacek, F.

AU - JET-EFDA Contributors, null

PY - 2005

Y1 - 2005

N2 - Observations of bright spots on the JET divertor aprons during lower hybrid current drive experiments are described. These bright spots are important because they can potentially cause damage to large tokamaks. The bright spots arise due to the impact of a fast particle beam. This beam originates from the front of the lower hybrid launcher, where thermal particles are accelerated according to theory by interaction with the high spatial harmonics of the lower hybrid wave. The bright spots are clearly related to the lower hybrid power as they disappear when the lower hybrid power is switched off. According to the analysis versus various parameters, the brightness of the spots clearly decreases with increasing plasma–wall distance, i.e. the distance between the last closed flux surface and the poloidal limiter. This is clearly beneficial for ITER, as it is designed to operate at a large plasma–wall distance.

AB - Observations of bright spots on the JET divertor aprons during lower hybrid current drive experiments are described. These bright spots are important because they can potentially cause damage to large tokamaks. The bright spots arise due to the impact of a fast particle beam. This beam originates from the front of the lower hybrid launcher, where thermal particles are accelerated according to theory by interaction with the high spatial harmonics of the lower hybrid wave. The bright spots are clearly related to the lower hybrid power as they disappear when the lower hybrid power is switched off. According to the analysis versus various parameters, the brightness of the spots clearly decreases with increasing plasma–wall distance, i.e. the distance between the last closed flux surface and the poloidal limiter. This is clearly beneficial for ITER, as it is designed to operate at a large plasma–wall distance.

KW - JET

KW - plasma

KW - fusion energy

KW - fusion reactors

KW - tokamak

KW - ITER

KW - lower hybrid current drive

KW - divertor

KW - divertor tiles

KW - first wall

KW - plasma-wall interactions

U2 - 10.1088/0741-3335/47/7/009

DO - 10.1088/0741-3335/47/7/009

M3 - Article

VL - 47

SP - 1101

EP - 1108

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 7

ER -

Rantamäki KM, Petrzilka V, Andrew P, Coffey I, Ekedahl A, Erents K et al. Bright spots generated by lower hybrid waves on JET. Plasma Physics and Controlled Fusion. 2005;47(7):1101 - 1108. https://doi.org/10.1088/0741-3335/47/7/009