Study of secondary instability of precursor magnetic island in COMPASS density limit disruptions

• Type: Article in International Scientific Journal
• Date: 2020-02-19

Authors

Francisco Salzedas (Author) FEUP; Syed I. W. Shah (Author) Other; Josef Havlícek (Author) Other; Juliane Stöckel (Author) Other; P. Hácek (Author) Other; Jozef Varju (Collaborator) Other; Ale¨ Havránek (Author) Other; Radomír Pánek (Collaborator) Other; Carlos A. Silva (Collaborator) Other

Journal

Title: Physics of Plasmas

Vol. 27 No. 2

Pages: 022515-1-022515-6

ISSN: 1070-664X

Publisher: American Institute of Physics

Indexing

ISI Web of Science

Scopus

INSPEC

Scientific classification

CORDIS: Physical sciences > Physics

FOS: Natural sciences > Physical sciences

Other information

DOI: 10.1063/1.5123677

Abstract (EN): A systematic study of COMPASS density limit disruptions (DLDs) was carried out to analyze the relation between the precursor magnetic island and its secondary instability (SI). In all of these plasmas, the SI was always found present at the onset of energy confinement erosion. The duration of this erosion was shorter for precursor quasi-locked island than for rotating island, and the larger the island amplitude, the shorter the duration. It was also found, at the onset of the erosion of energy confinement, an inverse relation between the magnetic island amplitude and its rotation frequency, showing that erosion can start at different values of precursor island amplitude, depending on what is its rotation frequency. DLDs occur either with smaller precursor island rotating faster or larger island rotating slower (quasi-locked). © 2020 Author(s).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6