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Fusion Science and Technology
More from UWC 2020: Round 2
This year’s Utility Working Conference had a dynamic opening plenary and a packed roster of informative sessions. Following are recaps of some of the 2:00 p.m. (EDT) sessions that took place.
Don't miss Newswire's coverage of the opening plenary and the sessions at 12:00 pm.
Y. Yasaka, A. Maruyama, N. Takano
Fusion Science and Technology | Volume 43 | Number 1 | January 2003 | Pages 44-50
Overview | dx.doi.org/10.13182/FST03-A11963561
Articles are hosted by Taylor and Francis Online.
MHD stability and ion cyclotron heating are investigated in the axisymmetric tandem mirror HIEI, which is a three-cell device with a typical magnetic field strength of 0.05-0.3-0.1-0.3 T, from central cell midplane to outer throat of plug cells. A magnetic divertor configuration introduced in the central cell provides magnetic nulls and stabilizes MHD activities by shorting-out the charge separation in the azimuthal direction. The density fluctuation of m = 1 flute mode is observed to decrease significantly by using the divertor. The stabilization effect of the divertor is stronger as the nulls are located at inner radius. It is observed from the cross correlation measurement that the electrons exhibit E × B motion in unstable plasmas, while they tend to follow the Boltzmann relation in the divertor-stabilized plasmas. The second harmonic ion cyclotron heating is also investigated. In the divertor configuration where the magnetic field strength varies significantly in radial direction, the ICRF waves have a large transverse gradient in amplitudes to enhance the finite Larmor radius effect. The wave propagation and damping are investigated theoretically and experimentally.