EXPERIMENTAL STUDIES ON ENERGY TRANSPORT IN A REVERSED FIELD THETA PINCH

概要

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The transport of energy and particles from a field reversed configuration (FRC) produced by a θ-pinch has been experimentally studied under the following typical plasma parameters in the quasi-static phase; T_i ∿ 300eV, T_e ∿ 100eV, n^^^-_e ∿ 5×10^<15>cm^<-3>, <β> ∿ 1,<Z_<eff>> ∿ 3 and the separatrix radius r_s ∿ 1.8cm. Energy transport through various processes has been evaluated, as is consistent with the observed volume averaged quantities which are changing in time with a quasi-static manner. As a result it has been found that the dominant energy loss mechanism is particles loss, which accounts for more than 50% of the power flow out of the FRC. The second important process is the electron thermal conduction loss which is estimated to be roughly 30% of the total loss if impurity radiation losses other than by carbon and oxygen are not important. In contrast, the ion thermal conduction loss is observed to be so small as to be hidden by the experimental errors. Radiation loss has been estimated to play a minor role if the observed <Z_<eff>> can be ascribed to contaminations of only carbon and oxygen. The inferred energy confinement time τ_E is 7 μs, which compares with the observed particle confinement time τ_p of 17 μs. The data indicates that τ_p is consistent with classical diffusion theories.
核融合科学研究所の論文