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Assessment of relevant pinch magnitudes of plasma focus devices based on non-uniform internal distributions of density and temperature

R Giovachini, M Barbaglia, R M Abraham-Ekeroth, A Clausse2023年Plasma Physics and Controlled FusionIF 2.2出版社

A novel model of the dense z-pinch of a plasma focus (PF) discharge is presented, assuming Gaussian radial distributions of density and temperature inside the pinch. The model is used to assess the temperature, size and lifetime of the focus conflating with available experimental data gathered from discharges in Deuterium performed in the PF PACO with three cathode configurations. The resulting estimations were mean pinch temperatures between 1 and 12 keV, and pinch durations between 10 and 120 ns, each magnitude decreasing and increasing with the filling pressure, respectively. Moreover, the relation found between the mean pinch radius and temperature, and , is consistent with an adiabatic compression given by mm keV3/4. The estimated width of the Gaussian profile is in agreement with spectroscopic images obtained in another small device.

日本語訳

プラズマフォーカス(PF)放電の高密度zピンチの新規モデルを提示する。このモデルでは、ピンチ内部の密度と温度の動径分布がガウス分布であると仮定する。このモデルを用いて、3種類の陰極構成を備えたPF PACO装置における重水素放電から得られた既存の実験データと照合し、フォーカスの温度、サイズ、および寿命を評価する。その結果、平均ピンチ温度は1〜12 keV、ピンチ持続時間は10〜120 nsと推定され、各値はそれぞれ充填圧力の増加に伴い減少、および増加した。さらに、平均ピンチ半径と温度の間に見出された関係は、断熱圧縮と整合的であり、mm keV3/4で表される。ガウス分布プロファイルの推定幅は、別の小型装置で得られた分光画像と一致する。

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