QUASI-STATIC COMPRESSIONAL HEATING OF A TOKAMAK

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概要

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• The theory of adiabatic compressional heating of a tokamak is extended to include every important phenomenon such as transports of heat and particles, and heat input into the plasma. It is demonstrated that nonadiabatic compressional heating process can be described by a physical picture which assumes that the process is composed of a long chain of an infinitesimally small unit event made up by successive adiabatic compression and diffusive expansion of a plasma. Based on the above picture fundamental compressional heating equation applicable to both B_t-and R-compression is obtained. As a result the additional heating effect observed in Tuman is found to be predicted. The equation becomes a linear differential equation of the first order if high power neutral beam heating and the energy confinement time τ_E of Alcator scaling type are assumed. The analytic solution reveals that there exists a optimum compression time τ_C as a function of the heating power Q_A and the field compression ratio K. This is understood by a simple physical consideration that if τ_C is small additional heatings become ineffective while if τ_C is large compressional heating does not operate effectively. The solutions also indicate that when Q_A, K and τ_C are properly selected even slow compression with τ_C of the order of (1-3)τ_E is effective to save Q_A by more than factor two for attaining the same temperature with the one achieved in an usual heating without compression.

• 核融合科学研究所の論文

著者

• Hirano Keiichi

  Research Information Center Institute Of Plasma Physics Nagoya University

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• QUASI-STATIC COMPRESSIONAL HEATING OF A TOKAMAK

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