An orbit-averaged Darwin quasi-neutral hybrid code

An orbit-averaged Darwin quasi-neutral hybrid code
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轨道平均达尔文准中性混合码

DOI:
10.1016/0021-9991(86)90076-8
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发表时间:
1986
影响因子:
4.1
通讯作者:
B. Cohen
B. Cohen
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
A. Zachary;B. Cohen

文献摘要

被引文献

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我们开发了一个轨道平均的达尔文准中性混合程序来研究超新星残余激波对宇宙线的在位加速。轨道平均算法非常适合跟踪由快速旋转的宇宙射线的共振驱动的Alfvén波的缓慢增长。我们给出了算法的完整描述,以及稳定性和噪声分析。代码在数值上是不稳定的,但一次电子折叠可能需要多达105个时间步长!因此,它可以用来研究Γ物理和Γ数值的不稳定性,只要Γ数值τγ最终和O(1)。我们还分析了一个物理不稳定性,这为我们的算法提供了一个成功的测试。
We have developed an orbit-averaged Darwin quasi-neutral hybrid code to study thein situacceleration of cosmic ray by supernova-remnant shock waves. The orbit-averaged algorithm is well suited to following the slow growth of Alfvén waves driven by resonances with rapidly gyrating cosmic rays. We present a complete description of our algorithm, along with stability and noise analyses. The code is numerically unstable, but a single e-folding may require as many as 105time-steps! It can therefore be used to study instabilities for whichΓphysical>,Γnumrical, provided thatΓnumericalτγfinal<O(1). We also analyze a physical instability which provides a successful test of our algorithm.