Multifractality in edge localzed modes in Japan Atomic Energy Research Institute Tokamak-60 Upgrade

Bak, P. E.; Asakura, Nobuyuki; Miura, Yukitoshi; Nakano, Tomohide; Yoshino, Ryuji

Physics of Plasmas, 8(4), p.1248 - 1252, 2001/04

https://doi.org/10.1063/1.1354647

The temporal losses of confinement during Edge Localised Modes in JT-60U show multifractal scaling and the spectra are generally smooth, but in some cases there are signs of discontinuous derivatives. Dynamics of the Sugama-Horton Model, interpreted as Edge Localised Modes, also display multifractal scaling. The spectra display singularities in the derivative, which can be interpreted as a phase transition. We argue that the multifractal spectra of Edge Localised Modes can be used to discriminate between different experimental discharges and validate Edge Localised Mode models.