Secondary instability as cause of minor disruptions in density limit tokamak plasmas

• Author(s): F. Salzedas
• Date: 2011
• Persistent ID: https://hdl.handle.net/10216/79064
• Origin: Repositório Aberto da Universidade do Porto
• Subject(s): Física experimental, Física; Experimental physics, Physical sciences
• Document Type: Journal article
• Language: English

Description

Experimental evidence was found in JET plasmas of a new instability at the onset of minor disruptions. This instability is observed during the growth of the well known m/n=2/1 magnetic island and is localized close to it, behaving as a secondary instability to the island. The large heat fluxes towards the plasma edge, characteristic of minor disruptions, occur during the low rotation phase of the magnetic island at a time the amplitude of the secondary instability suffers a large increase. No poloidal or toroidal mode numbers could be assigned to the secondary instability.