The effect of beta-induced Alfvén eigenmode on L-I-H transitions in the HL-2A tokamak

HL-2A team

Research output: Contribution to journalArticle

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Abstract

The characteristics of beta-induced Alfvén eigenmode (BAE) at L-I-H transitions have been investigated in the HL-2A experiments for the first time. It is found that a BAE of fBAE ∼ 13.6 kHz coexists with the limit cycle oscillations of fLCO ∼ 2.6 kHz and both disappear after the I-H transition in the discharges with L-I-H transitions. It is also found that the ambient turbulence is modulated by the radial electric field at the BAE frequency and that the level of density fluctuation gradually drops in L-I-H transitions, but it remains invariant in L-I-L ones. These results suggest a possible correlation between the BAE and the L-I-H transitions. The sudden disappearance of the BAE in L-I and I-H transitions has the similar effect of sawtooth crashes on triggering L-I-H transitions in the HL-2 A tokamak.

Original languageEnglish
Article number073026
JournalNuclear Fusion
Volume55
Issue number7
DOIs
Publication statusPublished - Jul 1 2015

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crashes
turbulence
oscillations
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electric fields

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

The effect of beta-induced Alfvén eigenmode on L-I-H transitions in the HL-2A tokamak. / HL-2A team.

In: Nuclear Fusion, Vol. 55, No. 7, 073026, 01.07.2015.

Research output: Contribution to journalArticle

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abstract = "The characteristics of beta-induced Alfv{\'e}n eigenmode (BAE) at L-I-H transitions have been investigated in the HL-2A experiments for the first time. It is found that a BAE of fBAE ∼ 13.6 kHz coexists with the limit cycle oscillations of fLCO ∼ 2.6 kHz and both disappear after the I-H transition in the discharges with L-I-H transitions. It is also found that the ambient turbulence is modulated by the radial electric field at the BAE frequency and that the level of density fluctuation gradually drops in L-I-H transitions, but it remains invariant in L-I-L ones. These results suggest a possible correlation between the BAE and the L-I-H transitions. The sudden disappearance of the BAE in L-I and I-H transitions has the similar effect of sawtooth crashes on triggering L-I-H transitions in the HL-2 A tokamak.",
author = "{HL-2A team} and Yan, {L. W.} and J. Cheng and Dong, {J. Q.} and K. Itoh and Zhao, {K. J.} and Huang, {Z. H.} and Ji, {X. Q.} and Yu, {D. L.} and L. Nie and M. Jiang and Liu, {C. H.} and Song, {X. M.} and Yuan, {B. S.} and Yi Liu and Yang, {Q. W.} and Ding, {X. T.} and Itoh, {S. I.} and Duan, {X. R.} and Y. Liu",
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AU - Itoh, K.

AU - Zhao, K. J.

AU - Huang, Z. H.

AU - Ji, X. Q.

AU - Yu, D. L.

AU - Nie, L.

AU - Jiang, M.

AU - Liu, C. H.

AU - Song, X. M.

AU - Yuan, B. S.

AU - Liu, Yi

AU - Yang, Q. W.

AU - Ding, X. T.

AU - Itoh, S. I.

AU - Duan, X. R.

AU - Liu, Y.

PY - 2015/7/1

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N2 - The characteristics of beta-induced Alfvén eigenmode (BAE) at L-I-H transitions have been investigated in the HL-2A experiments for the first time. It is found that a BAE of fBAE ∼ 13.6 kHz coexists with the limit cycle oscillations of fLCO ∼ 2.6 kHz and both disappear after the I-H transition in the discharges with L-I-H transitions. It is also found that the ambient turbulence is modulated by the radial electric field at the BAE frequency and that the level of density fluctuation gradually drops in L-I-H transitions, but it remains invariant in L-I-L ones. These results suggest a possible correlation between the BAE and the L-I-H transitions. The sudden disappearance of the BAE in L-I and I-H transitions has the similar effect of sawtooth crashes on triggering L-I-H transitions in the HL-2 A tokamak.

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