Disentanglement of density and rotation dependences of the field penetration threshold on the J-TEXT tokamak

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Indexed by:Journal paper

First Author:Zhuo Huang

Correspondence Author:Yunfeng Liang,Nengchao Wang

Co-author:Qiming Hu,Da Li

Journal:Nuclear Fusion

Included Journals:SCI

Volume:60

Issue:6

Page Number:064003

Key Words:magnetohydrodynamics, magnetic reconnection, tearing instability, tokamaks

DOI number:10.1088/1741-4326/ab8859

Date of Publication:2020-05-19

Impact Factor:3.706

Abstract:The field penetration threshold of magnetic perturbations has been observed to vary non-monotonically with an increase of density in ohmic plasmas on the J-TEXT tokamak. This observation appears contradicting the previous empirical density scaling law. Disentanglement of plasma density and rotation dependences of the field penetration threshold has been carried out. It shows that the field penetration threshold depends only weakly on the density but linearly on the plasma rotation. This result is not only important for the prediction of error field tolerance in fusion devices, but also opens a question on the role of density in the forced magnetic reconnection process in magnetized plasmas.