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Observations of the Onset of the Energy Quench in ASDEX Upgrade Density Limit D...
Francisco José Batista Salzedas; G. Pautasso; I. Nunes; W. Suttrop; M. Maraschek; M. E. Manso; ASDEX teamTokamak major density limit disruptions are usually preceded by a m/n=2/1 tearing mode, that may or may not lock to the vessel wall. The complete destruction of energy confinement in these major disruptions is known to have a characteristic m/n=1/1 form. Initially only a small degradation of the confinement occurs, as is observed by the slow increase of the electron temperature at the plasma edge. But at some ...
Sawtooth, Neo-Classical Tearing Mode and Error Field Studies in JET
T. C. Hender; O. Sauter; B. Alper; C. Angioni; M. Baar; M. Benedetti; P. Belo; M. Bigi; D. N. Borba; T. Bolzonella; R. Budny; R. J. ButteryA range of ITER relevant plasma stability issues have been studied in the JET tokamak; these include the effects of fast particles on sawteeth, control of NTMs via sawteeth seeds, scaling of (2,1) NTM thresholds and the effect of error fields on plasma rotation and vice-versa. The sawtooth studies have examined both the effects of ICRF and NBI fast particles, and models used for ITER predictions have been valid...
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