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The effect of a metallic reflector upon cyclotron radiation

R.A. Krajcik1973年被引用 20Nuclear FusionIF 3出版社

A careful study of the effect of a metallic reflector upon cyclotron radiation emanating from a uniform plasma is made in which the angular, polarization, and frequency dependence of both the cyclotron radiation and the metallic reflector is taken into account. The properties of the metallic reflector then enter in a natural way and share equal status with the properties of the plasma. The radiation coefficient, the ratio of the cyclotron radiation absorbed by the reflector to that generated by the plasma, becomes a function of the two parameters: Te, the electron temperature, and ℓne/B(Bρ)1/2, the plasma depth to cyclotron radiation, where ℓ is the perpendicular distance across the reflector, ne is the electron density, B is the magnetic field, and ρ is the resistivity of the reflector. The radiation coefficient is determined for both slab and cylindrical geometries for the range of values 20 ≤ Te ≤ 120 (keV) and 1019 ≤ ℓne/B(Bρ)1/2 ≤ 1027(MKS). A simple analytic approximation is given for the radiation coefficient for each geometry, and the results are then applied to a low-β thermonuclear device based on the D-D reaction. For β of the order of 1 to 2%, and for devices of moderate size (ℓ of the order of a few metres), the metallic reflector is incapable of reducing the cyclotron radiation loss below that required for a self-sustained D-D reaction.

日本語訳

金属反射板が一様プラズマから発するサイクロトロン放射に及ぼす影響についての詳細な研究が行われ、その際、サイクロトロン放射と金属反射板の両方の角度依存性、偏光依存性、周波数依存性が考慮される。金属反射板の特性はその後自然な形で現れ、プラズマの特性と同等の地位を占める。放射係数、すなわち反射板によって吸収されるサイクロトロン放射とプラズマによって生成されるサイクロトロン放射の比は、2つのパラメータ、Te と ℓne/B(Bρ)1/2(サイクロトロン放射に対するプラズマの深さ)の関数となる。ここで、ℓ は反射板を横切る垂直距離、ne は電子密度、B は磁場、ρ は反射板の抵抗率である。放射係数は、スラブ形状と円筒形状の両方について、20 ≤ Te ≤ 120 (keV) および 1019 ≤ ℓne/B(Bρ)1/2 ≤ 1027 (MKS) の値の範囲で決定される。各形状について放射係数の簡単な解析的近似が与えられ、その結果は D-D 反応に基づく低β熱核融合装置に適用される。βが1〜2%の程度で、装置のサイズが中程度(ℓが数メートルの程度)の場合、金属反射板は、自己維持型 D-D 反応に必要なレベル以下にサイクロトロン放射損失を低減することはできない。

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