Nonlinear studies of axis-encircling electron beam with off-centering and field tapering effects

IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI:10.1109/PLASMA.1989.166157

V. Ayres, J. Choe, K. Boulais, H. Uhm

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Abstract

A self-consistent nonlinear analysis of an axis-encircling electron beam in a vane circuit oscillator has been made. Optimized quantities with respect to energy, current, vane depth, and magnetic field have been determined and compared with experiment. The analysis also includes more realistic parameters, such as the off-centering effect and the tapering of the magnetic field. Three specific sources of off-centering have been identified: (1) an unbalanced magnetic field reversal, (2) a finite-span magnetic transition, and (3) a finite upstream Larmor radius. The effects of these sources of off-centering on an ideal configuration (balanced field reversal, zero-span cusp and constant up- and downstream magnetic fields) have been investigated. For the peniotron mechanism to dominate over the competing negative mass instability, a near-ideal axis-encircling electron beam is required. Tolerances for off-centering effects causing deviation from ideal have been investigated. Magnetic tapering has been investigated both as a realistic experimental parameter and for the purposes of designing an adiabatic compression, which has been shown to reduce the off-centering effect.<>

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偏心和场锥效应下绕轴电子束的非线性研究

对叶片电路振荡器中绕轴电子束进行了自洽非线性分析。确定了能量、电流、叶片深度和磁场的优化量，并与实验进行了比较。分析还包括了更现实的参数，如离心效应和磁场的逐渐变细。已经确定了三种偏离中心的具体来源:(1)不平衡的磁场反转，(2)有限跨度的磁跃迁，以及(3)有限的上游拉莫尔半径。研究了这些离心源对理想结构(平衡磁场反转、零跨度尖峰和恒定的上下磁场)的影响。为了使质子机制在负质量不稳定性的竞争中占主导地位，需要一个接近理想的绕轴电子束。对偏心效应引起的偏离理想的公差进行了研究。磁锥度作为一种现实的实验参数和设计绝热压缩的目的已经被研究过，它已经被证明可以减少离心效应。

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来源期刊

IEEE 1989 International Conference on Plasma Science

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0.10

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