ELM-related fluctuations in PBX-M H-modes
S M Kaye; J L Dunlap; T S Hahm; S Sesnic; W Tang; J H Harris; P Roney; W Davis; S M Kaye; Plasma Phys. Lab., Princeton Univ., NJ, USA; J L Dunlap; Plasma Phys. Lab., Princeton Univ., NJ, USA; T S Hahm; Plasma Phys. Lab., Princeton Univ., NJ, USA; S Sesnic; Plasma Phys. Lab., Princeton Univ., NJ, USA; W Tang; Plasma Phys. Lab., Princeton Univ., NJ, USA; J H Harris; Plasma Phys. Lab., Princeton Univ., NJ, USA; P Roney; Plasma Phys. Lab., Princeton Univ., NJ, USA; W Davis; Plasma Phys. Lab., Princeton Univ., NJ, USA
Журнал:
Plasma Physics and Controlled Fusion
Дата:
1994-07-01
Аннотация:
Edge Localized Modes have been studied in PBX-M discharges with high data sampling rate magnetic diagnostics with good spatial coverage. High frequency (>or=250 kHz) activity appears prior to the increase in the D<sub>alpha </sub> emission. While this high frequency activity is global, with high coherence for all coils both on the inside and outside midplane, there is no identifiable mode structure. A very intense outward ballooning feature appears simultaneously with the increase in the D<sub>alpha </sub> emission, and lasts for about 5 msec. The toroidal mode structure of this feature is clearly identifiable, consisting of a series of toroidal harmonics from n=3 to 8, at frequencies given by f<sub>n</sub>=f<sub>0</sub>+n Delta f, where Delta f=20-30 kHz and f<sub>0</sub>=30-50 kHz. This feature may be caused by the kinetic ballooning mode.
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