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Return To: Session CDP - Plasma Heating and Current Drive
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R. Kaita , R. Majeski , J. Menard , T. Munsat ,
H. Kugel , P. Efthimion , M. Ono , D. Jens ,
B. Jones
Plasma Physics Laboratory and Department of Physics, Princeton
University, Princeton, New Jersey, USA
D. Stutman , M. Finkenthal
Johns Hopkins University, Baltimore, Maryland, USA
T. Intrator , R. Fonck
University of Wisconsin, Madison, Wisconsin, USA
W.-H. Choe , Y.-S. Hwang
Korea Advanced Institute of Science and Technology, Taejon, Korea
V. K. Gusev , Y. Petrov
Ioffe Institute, St. Petersburg, Russia
T. Seki
National Institute for Fusion Science, Nagoya, Japan
Y. Takase
Tokyo University, Tokyo, Japan
Abstract
The Current Drive Experiment-Upgrade (CDX-U ) is the first spherical
torus (ST) to investigate radio frequency (RF) heating and current drive. To
address the concern that large magnetic field line pitch at the outboard
midplane of ST's could inhibit successful coupling to the high harmonic fast
wave (HHFW), a rotatable, two strap antenna was installed on CDX-U. Parasitic
loading and impurity generation were discovered to be weak and nearly
independent of antenna phasing and angle over a wide range, and fast wave
electron heating has been observed. Plasma densities up to about
were obtained with noninductive startup solely with HHFW. New ST
diagnostics under development on CDX-U include a multilayer mirror (MLM)
detector to measure ultrasoft X-rays, a twelve spatial point Thomson
scattering (TS) system, and an Electron Bernstein Wave (EBW) system for both
electron heating and electron temperature measurements. Preliminary
experiments with a boron low velocity edge micropellet injector have also been
performed, and further studies of its effectiveness for impurity control will
be conducted with a variety of spectroscopic and imaging diagnostics on
CDX-U.
IAEA 1999