Work

Optimization of the active MHD spectroscopy system on JET for the excitation of individual intermediate and high-n Alfvén eigenmodes

Year: 2010

Type: article

Abstract: The stability of Alfvén eigenmodes (AEs) is studied experimentally in the JET tokamak by observing the plasma response to antenna-driven frequency-sweeping perturbations at the plasma edge. During the 2008/9 experimental campaigns, the complete set of the new antennas was operated and AEs with toroidal mode numbers (n) in the intermediate-n range were excited under various plasma conditions. In this paper, we describe the results of the work achieved on the technical aspects of the diagnostic. The antenna currents have been optimized to improve the antenna–plasma coupling. The mode-tracking system has been upgraded for real-time targeting of modes with specific n. As an example of the optimized performance of the diagnostic, the paper concludes with a report on the damping rates of n = 3–5 toroidal AEs that were measured dynamically while the background plasma parameters were evolving in time.

Source: Nuclear Fusion

DOI: 10.1088/0029-5515/50/8/084019

Authors: T. Panis, D. Testa, A. Fasoli, A. Klein, H. Carfantan, P. Blanchard

Institutions: École Polytechnique Fédérale de Lausanne, Massachusetts Institute of Technology, Centre National de la Recherche Scientifique, Université de Toulouse, Culham Science Centre

Language: English

Topic: Magnetic confinement fusion research

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funders: EUROfusion, European Commission

OpenAlex ID: W2003135829

FWCI: 1.879

Cites: 24

Cited by: 27

Related to: 10