PERSISTENT DENSITY PERTURBATIONS AT RATIONAL IT-Q SURFACES FOLLOWING PELLET INJECTION IN THE JOINT EUROPEAN TORUS
In JET, the ablation of injected pellets produces a striking resonance effect when the pellets reach surfaces with q-values 1 and 3/2. Subsequently, structures with mode numbers m=1, n=1 and m=3, n=2 are observed with the soft X-ray cameras for more than 2 s as compact snake- like perturbations. These structures, which persist through several sawtooth collapses, give information on the radii of the q=1 and q=3over2 surfaces and the q- profile evolution. The observations can be explained by the formation of magnetic islands.
Bibliographic Reference: REPORT JET-P(87)07, 1987, AVAILABILITY: JET, ABINGDON, UK
Record Number: 1989126092900 / Last updated on: 1989-05-01
Available languages: en