Release Time:2019-03-13  Hits:

Indexed by: Journal Article

Date of Publication: 2018-12-01

Journal: PHYSICS OF PLASMAS

Included Journals: Scopus、SCIE

Volume: 25

Issue: 12

ISSN: 1070-664X

Key Words: Plasmas, Density fluctuation; Density gradients; Edge localized modes; Electrical potential; Fluctuation analysis; Linear simulation; Nonlinear simulations; Quasi-coherent modes, Condensed matter physics

Abstract: We have performed linear and nonlinear simulations to study the drive mechanism of the quasi-coherent modes (QCM) during the inter-edge localized mode period in HL-2A. With an unstable Resistive-Ballooning mode from linear simulations, the nonlinear simulation has successfully reproduced the QCM inside the separatrix at the outer mid-plane. The poloidal wave number and frequency from fluctuation analysis are almost the same as the experimental results. The phase shift between the electrical potential and the density fluctuation matches. Linear and nonlinear global profile scans show that the QCM is triggered by the density gradient. Based on these scans, some other experimental observations of the QCM are explained. Published by AIP Publishing.