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Experimental studies on energy transport in a reversed-field theta pinch

Y. Aso, S. Himeno, K. Hirano1983年被引用 27Nuclear FusionIF 3出版社

The transport of energy and particles from a field-reversed configuration (FRC) produced by a theta pinch has been studied experimentally under the following typical plasma parameters in the quasi-static phase: Ti ∼ 300 eV, Te∼100eV, e ∼ 5 × 1015 cm−3, ⟨β⟩ ∼ 1, ⟨Zeff⟩ ∼ 3 and separatrix radius rs ∼ 1.8 cm. Energy transport through various processes has been evaluated, consistent with the observed volume-averaged quantities which are changing in time in a quasi-static manner. As a result, it has been found that the dominant energy loss mechanism is particle loss, which accounts for more than 50% of the power flow out of the FRC. The second important process is the electron thermal conduction loss, which is estimated to be roughly 30% of the total loss if impurity radiation losses other than by carbon and oxygen are not important. In contrast, the ion thermal conduction loss is observed to be so small as to be hidden by the experimental errors. Radiation loss has been estimated to play a minor role if the observed ⟨Zeff⟩ can be ascribed to contaminations of only carbon and oxygen. The inferred energy confinement time τE is 7 is μs, which compares with the observed particle confinement time τp of 17 μs. The data indicate that τp is consistent with classical diffusion theory.

日本語訳

逆転磁場配位(FRC)をシータピンチで生成した際のエネルギーおよび粒子輸送を、以下の典型的なプラズマパラメータの準定常位相において実験的に研究した:Ti ∼ 300 eV、Te ∼ 100 eV、ne ∼ 5 × 10^15 cm^-3、⟨β⟩ ∼ 1、⟨Zeff⟩ ∼ 3、セパラトリックス半径 rs ∼ 1.8 cm。種々の過程によるエネルギー輸送を評価し、時間的に準定常的に変化する体積平均量の観測結果と整合することを確認した。その結果、支配的なエネルギー損失機構は粒子損失であり、FRCから流出するパワーフローの50%以上を占めることが明らかになった。第二に重要な過程は電子熱伝導損失であり、炭素および酸素以外の不純物放射損失が重要でない場合、全損失のおよそ30%と見積もられる。一方、イオン熱伝導損失は実験誤差に埋もれるほど小さく観測された。放射損失は、観測された⟨Zeff⟩が炭素および酸素のみの混入に起因すると仮定できる場合、副次的な役割しか果たさないと見積もられた。導出されたエネルギー閉じ込め時間τEは7 μsであり、観測された粒子閉じ込め時間τpの17 μsと比較される。データは、τpが古典拡散理論と整合することを示している。

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Reversed field pinch
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