|akh_icc2006reduced-1.pdf||2006-03-06 08:03:54||Alexande Hansen|
Varying Electron Cyclotron Resonance Heating to Modify Confinement on the Levitated Dipole Experiment.
Author: Alexande K Hansen
Submitted: 2005-12-21 10:41:35
Co-authors: D.T. Garnier, J. Kesner, M.E. Mauel, A.C. Boxer, J.L. Ellsworth, I. Karim, E.E. Ortiz
Columbia University, visiting MIT PSFC
175 Albany Street, NW17-219
Cambridge, MA 02139
Plasmas in the Levitated Dipole Experiment are formed and sustained
currently via two electron cyclotron resonance heating (ECRH)
sources: 2.5 kW at 2.45 GHz and 2.5 kW at 6 GHz. An important
topic being investigated is how varying the ECRH affects the
confinement and stability of the plasma. We report the results of
using different operational combinations of our RF sources, such as
varying the power levels, sequencing of the onset time, and
altering the active duration. We also report results from
experiments in which the plasma shape was altered via external
coils, which serves to enhance the effects of changes in the RF
power on confinement. Although in the levitated mode of operation
the ability to alter the dipole coil current, this can be done when
the coil supported, and these experiments have been performed.
Results from these studies will be presented and discussed, as well
as the status of the next step in our ECRH program: more power at
an additional frequency.
Please place with other LDX posters as second poster in grouping.