Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apre16006c&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
In plasmas that are at ignition by fusion reactions, all energy losses are compensated by the energy deposited on them by the fusion reaction products. Since the reaction rate depends strongly on both particle density and temperature, which in turn are functions of space, the plasma column is inherently a self organized system. Collective modes that macroscopically effect the plasma temperature and density profiles such as sawtooth oscillations involving magnetic reconnection are expected to play an important role in parallel to microscopic modes that control the particle and thermal energy transport as well as the rate of spontaneous plasma rotation. Simpler systems such as an axisymmetric toroidal plasma column subject to the ohmic heating due to the currents that produce the confining magnetic field and depend on the temperature distribution show that self organization processes have to be invoked in order to explain features such as profile consistency, the radial dependence of the thermal diffusivity, etc. The relevant features and limits of proposed and designed fusion burning experiments are discussed. Sponsored in part by the U.S. Department of Energy
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