核融合研究

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A magnetohydrodynamic model for a implosion of pinch plasma, in which a external magnetic field (compression field) was taken as
B_e (t) = (dB_e/dt) _t=0t and a bias magnetic field B₁ existed in a plasma column, was studied in the previous paper. Here, (dB_e /dt) _t=0 is the rising speed of the compression field in the initial stage of the pinch. However, the external field has practically the form of
B_e (t) =B₁+ (dB_e/dt) _t=0t in many pinch experiments of the case of the existence of the bias field. In the case of such an external field, it is expected that the effects of the bias field on the implosion differ from those reported in the previous paper. In this paper, the characteristics of the implosion in that case are discussed by using the model. The result entirely different from it in the previous paper is that the values of the starting time of compression and the time of maximum compression decrease as B₁ becomes larger.

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Far-infrared laser scattering measurements on JIPP T-II are performed using 337-μm HCN laser. Density fluctuations with wave-numbers in the range of 1.5-10 cm^-1 are observed and the frequency spectra are found to be distributed in the range of frequencies of drift waves.
The product of the energy confinement time τ_E and quasi-linear diffusion coefficient D_q.1. evaluated from the measured density fluctuations is found to be independent of the electron density averaged over the plasma cross section.

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