Localization of MHD modes and consistency with q-profiles in JET
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- 作者：R. De Angelis ; M. Baruzzo ; P. Buratti ; B. Alper ; L. Barrera ; A. Botrugno ; M. Brix ; L. Figini ; A. Fonseca ; C. Giroud ; N. Hawkes ; D. Howell ; E. De La Luna ; F. Orsitto ; V. Pericoli ; E. Rachlew ; O. Tudisc
- 关键词：Plasma physics ; Tokamak ; q-Profile
- 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- 出版年：2010
- 出版时间：11 November 2010
- 年：2010
- 卷：623
- 期：2
- 页码：734-737
- 全文大小：793 K
文摘
The measurement of the safety factor q in tokamaks, which describes the winding of the helical magnetic field lines, is very important especially for the achievement of advanced scenarios. The motional Stark effect diagnostic can provide a direct measurement of the magnetic field orientation but the derivation of the q-profiles requires a simulation of the magnetic equilibrium taking into account inputs from several other diagnostics. This analysis can be affected by large errors. In order to validate the results, q-profiles are compared with the radii of MHD modes, which can be attributed to surfaces of known q.