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Theory of betatronic electron acceleration in an azimuthal pinch as a function of initial conditions: Comparison of experimental results

L. Dupas, J. Leroy, T. Consoli1963年被引用 5Nuclear FusionIF 3出版社

In the course of a more general study on the influence of initial plasma conditions on plasma evolution under magnetic compression it was decided to analyse the mechanism responsible for the production of gamma rays observed and measured while the compression field was being set up.In the first part we tried to measure the time of diffusion and the depth of penetration of the electric field induced by variation of the compression field. It was found that the diffusion of this azimuthal electric field in the column of plasma produced by reflex discharge is quasi-complete and instantaneous. From the very commencement of compression, therefore, there exist two crossed fields (B0 static initial and E0 azimuthal induced), and the presence of these fields is a necessary and sufficient condition for the acceleration of electrons in a transverse plane. This layer of quasi-relativistic electrons produced through improved conductivity makes it possible to trap the static magnetic field existing at the moment of their formation.In the second and principal part of this report, the equations of motion are solved, starting from the initial conditions of experimental physical reality. The theoretical energies obtained by this mechanism are in agreement with the energy of the measured gammas.Finally, the third part gives experimental results of gamma-ray and u.h.f.-radiation measurements and photographic recordings.

日本語訳

磁気圧縮下でのプラズマ進化に対する初期プラズマ条件の影響に関するより一般的な研究の過程において、圧縮磁場の立ち上げ中に観測・測定されたガンマ線の生成機構を解析することが決定された。第一部では、圧縮磁場の変化によって誘起される電場の拡散時間と浸透深さの測定を試みた。その結果、反射放電によって生成されたプラズマ柱内におけるこの方位角方向の電場の拡散は、準完全かつ瞬時的であることが判明した。したがって、圧縮開始のごく初期から、二つの交差した磁場(静的な初期磁場B₀と誘起された方位角方向の電場E₀)が存在し、これらの場の存在は、横方向平面内での電子加速の必要十分条件である。この改良された導電率によって生成された準相対論的電子の層は、その形成時点に存在していた静磁場を閉じ込めることを可能にする。第二部(主要部)では、実験的物理的現実の初期条件から出発して運動方程式を解いた。この機構によって得られた理論的エネルギー値は、測定されたガンマ線のエネルギーと一致する。最後に第三部では、ガンマ線および極超短波(UHF)放射の測定結果と写真記録の実験結果を示す。

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Electron acceleration
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