Dynamics of a z pinch for focusing high‐energy charged particles
Dynamics of a z pinch for focusing high‐energy charged particles
复制标题
用于聚焦高能带电粒子的 z 收缩动力学
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
K. Frank
中科院分区：
文献类型：
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作者：
F. Dothan;H. Riege;E. Boggasch;K. Frank
研究了线性 z 收缩的动力学。通过长度为 270 毫米、直径达 40 毫米的收缩等离子体柱，流过最大 400 kA 的电流；由此产生的方位磁场，在空间和时间上稳定达 0.5 μs，应用作带电粒子束的聚焦透镜。测量了放电电流和电压，以及不同半径处的磁场强度。导出了作为半径和时间的函数的电流密度，以及内爆电流层的速度和宽度。发现了在最大收缩时刻附近激发的电流环路（“电感”）；它们导致柱中的箍缩电流和磁场的有利放大。通过选择氧化铝作为壁材料并选择氢气作为填充气体，可以避免有害壁电流的形成。
The dynamics of a linear z pinch is studied. Through the pinched plasma column of length 270 mm and diameter up to 40 mm flows a current of maximum 400 kA; the resulting azimuthal magnetic field, spatially and temporally stable for up to 0.5 μs, shall be used as a focusing lens for a charged particle beam. The discharge current and voltage were measured, as well as the magnetic field strength at different radii. The current density as a function of radius and time was derived, and also the velocity and width of the imploding current layer. Current loops (‘‘inductons’’), excited near the maximum contraction moment, were found; they lead to a favorable amplification of the pinch current and of the magnetic field in the column. By choosing aluminum oxide as the wall material and hydrogen as the filling gas the formation of harmful wall currents can be avoided.