核融合研究

The method of plasma confinement with travelling magnetic field was investigated both from magnetohydrodynamic and from charged particle orbit theory. The eminent advantages of applying travelling magnetic field to plasma confinement is thought to consist in its highly gradiented field-configuration to provide a completely stable magnetic bottle and in its restoring action to drive a particle back to the plasma, region. Two facts will be made clear in this paper; one is the need for superposition of two oppositely travelling fields, and the other is that the gradiented travelling field has the effects of driving the charged particles toward the direction where the field stregth decreases, and thus eliminates the particle losses from the plasma region. These facts would suggest the possible realization of.stable confinement of thermounclear plasma. The need of superposing static magnetic induction on this scheme is also discussed.

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The increment of the DC current in the “Resonance Probe” is calculated from the second oder perturbation term of the electron distribution function, when it is expanded in power of a small amplitude of the AC voltage applied to the probe. The increment δj thus calculated well explains the experimental result (K. Takayama et al; Phys. Rev. Letters 5, 1960, 238), that is, δj retains a finite value for ω_o<ω_p, shows a resonant peak at ω_o= ω_p and goes down to zero for ω_o>ω_p, where ω_o and ω_p are the applied frequency and plasma frequency respectively, The result of calculation also shows that the ratio of the peak height to the value of δj at ω_o=ω is independent of the DC probe potenntial and given by
{(ω²+ν²) / (ω_p²+ν²)} |ε (ω) /ε (ω_p) |²,
the half width being give by 2ν, where ν is the effective collision frequency of the electron with neutral molecules and ε (ω) is the complex dielectric permittivity of plasma.

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