Measurement of core velocity fluctuations and the dynamo in a reversed-field pinch

Conference · Thu Dec 31 04:00:00 EST 1998

DOI:https://doi.org/10.1063/1.873439· OSTI ID:296833

Den Hartog, D J; Craig, D; Fiksel, G; Fontana, P W; Prager, S C; Sarff, J S ^[1]; Chapman, J T ^[2]

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1. Univ. of Wisconsin, Madison, WI (United States). Dept. of Physics
2. Siemens Medical Systems, Inc., Hoffman Estates, IL (United States). Nuclear Medicine Group

Plasma flow velocity fluctuations have been directly measured in the high temperature magnetically confined plasma in the Madison Symmetric Torus (MST) Reversed-Field Pinch (RFP). These measurements show that the flow velocity fluctuations are correlated with magnetic field fluctuations. This initial measurement is subject to limitations of spatial localization and other uncertainties, but is evidence for sustainment of the RFP magnetic field configuration by the magnetohydrodynamic (MHD) dynamo. Both the flow velocity and magnetic field fluctuations are the result of global resistive MHD modes of helicity m = 1, n = 5--10 in the core of MST. Chord-averaged flow velocity fluctuations are measured in the core of MST by recording the Doppler shift of impurity line emission with a specialized high resolution and throughput grating spectrometer. Magnetic field fluctuations are recorded with a large array of small edge pickup coils, which allows spectral decomposition into discrete modes and subsequent correlation with the velocity fluctuation data.

• Research Organization: Univ. of Wisconsin, Dept. of Physics, Madison, WI (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: FG02-96ER54345
• OSTI ID: 296833
• Report Number(s): DOE/ER/54345--311; CONF-981127--; ON: DE99001348
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
MAGNETIC FIELD CONFIGURATIONS
MAGNETOHYDRODYNAMICS
MST DEVICE
PLASMA DIAGNOSTICS
PLASMA DRIFT
PLASMA INSTABILITY
PLASMA WAVES
SAWTOOTH OSCILLATIONS