Observation of magnetohydrodynamic instability and direct measurement of local perturbed magnetic field using motional Stark effect diagnostic

Autor:	Am Garofalo, H. Reimerdes, R. J. Jayakumar, M. A. Makowski, Max E Austin, S.L. Allen, R. J. LaHaye, T. L. Rhodes
Rok vydání:	2004
Předmět:	Physics Field (physics) Plasma oscillation Magnetic field symbols.namesake Amplitude Stark effect Physics::Plasma Physics symbols Plasma diagnostics Magnetohydrodynamic drive Atomic physics Magnetohydrodynamics Instrumentation
Zdroj:	Review of Scientific Instruments. 75:2995-3001
ISSN:	1089-7623 0034-6748
Popis:	The local oscillating component of the poloidal magnetic field in plasma associated with magnetohydrodynamic (MHD) instabilities has been measured using the motional Stark effects (MSE) diagnostic on the DIII–D tokamark. The magnetic field perturbations associated with a resistive wall mode rotated by internal coils at 20 Hz was measured using the conventional MSE operation mode. These first observations of perturbations due to a MHD mode were obtained on multiple MSE channels covering a significant portion of the plasma and the radial profile of the amplitude of the perturbed field oscillations was obtained. The measured profile is similar to the profile of the amplitude of the electron temperature oscillation measured by electron cyclotron emission (ECE) measurements. In a new mode of measurement, the amplitude of a tearing mode rotating at a high frequency (∼7 kHz) was observed using the spectral analysis of high frequency MSE data on one channel. The spectrum consists of the harmonics of the light mod...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c23afa5d114f2865c59c89e5279b35dc https://doi.org/10.1063/1.1785847 Zobrazit plný text záznamu