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TJ-II:Instabilities: Difference between revisions
→MHD and Alfvén modes
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The appearance of low-frequency Magneto-HydroDynamic (MHD) modes (some tens of kilohertz) in electron cyclotron heated plasmas depends on the rotational transform profile and the plasma density. In neutral beam injection plasmas, high-frequency modes (150- to 300-kHz) have been found in plasmas with line densities in the range 0.6 × 10<sup>19</sup> m<sup>-3</sup> to 3 × 10<sup>19</sup> m<sup>-3</sup> and heated with on/off-axis electron cyclotron heating. They are good candidates for global [[Alfvén eigenmodes]] related to the low-order resonance n/m = 3/2. | The appearance of low-frequency Magneto-HydroDynamic (MHD) modes (some tens of kilohertz) in electron cyclotron heated plasmas depends on the rotational transform profile and the plasma density. In neutral beam injection plasmas, high-frequency modes (150- to 300-kHz) have been found in plasmas with line densities in the range 0.6 × 10<sup>19</sup> m<sup>-3</sup> to 3 × 10<sup>19</sup> m<sup>-3</sup> and heated with on/off-axis electron cyclotron heating. They are good candidates for global [[Alfvén eigenmodes]] related to the low-order resonance n/m = 3/2. | ||
<ref>[http://www.new.ans.org/pubs/journals/fst/a_1283 R. Jiménez-Gómez et al., ''Analysis of Magnetohydrodynamic Instabilities in TJ-II Plasmas'', Fusion Science and Technology '''51''', 20 (2007)]</ref> | <ref>[http://www.new.ans.org/pubs/journals/fst/a_1283 R. Jiménez-Gómez et al., ''Analysis of Magnetohydrodynamic Instabilities in TJ-II Plasmas'', Fusion Science and Technology '''51''', 20 (2007)]</ref> | ||
<ref>[http://dx.doi.org/10.1088/0029-5515/51/3/032001 R. Jiménez-Gómez, A. Könies, E. Ascasíbar, et al, ''Alfvén eigenmodes measured in the TJ-II stellarator'', Nucl. Fusion '''51''' (2011) 033001 ]</ref> | |||
== ELM-like modes == | == ELM-like modes == | ||