The relaxation of the ion distribution function was measured for a plasma (n ≃ 1012 cm−3, Ēi = 200 eV) confined in a circularized, stabilized magnetic mirror well. The results were compared with the predictions of a Fokker-Planck computer code. The evolution of an initially skewed angular distribution function appeared to be in good accord with the theoretical model. However, the final anisotropy of the plasma was greater than the calculated one.
Dans le puits magnétique très peu profond (R⊥ = 1,004 au bord du plasma) de DECA II B, le plasma est en équilibre stable vis à vis des phénomènes d'interchange. La fonction de distribution ionique qui présente un minimum pour θ = arc tgV⊥/V// = 90° au moment de la capture, relaxe en 600 µs vers une fonction ayant son maximum à θ = 90°. Les causes de cette relaxation sont discutées
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