自洽定态分布球状束团中晕的形成
Halo Formation in Spheroidal Bunches with Self-Consistent Stationary Distributions
摘要：
本文构造了一类新的自洽6-D相空间平稳分布。然后，光束纵向和/或横向不匹配，我们探讨了光束的稳定性和晕形成的情况下，3-D轴对称束团使用粒子在细胞模拟。我们专注于束团的长宽比从1到5，这涵盖了APT直线加速器参数的典型范围内的光束。我们发现，纵向晕的形式第一可比的纵向和横向失配。一个有趣的耦合现象-纵向或横向晕观察，即使对于非常小的失配，如果在其他平面的失配是大的-被发现。
英文摘要：
A new class of self-consistent 6-D phase space stationary distributions is constructed both analytically and numerically. The beam is then mismatched longitudinally and/or transversely, and we explore the beam stability and halo formation for the case of 3-D axisymmetric beam bunches using particle-in-cell simulations. We concentrate on beams with bunch length-to-width ratios varying from 1 to 5, which covers the typical range of the APT linac parameters. We find that the longitudinal halo forms first for comparable longitudinal and transverse mismatches. An interesting coupling phenomenon - a longitudinal or transverse halo is observed even for very small mismatches if the mismatch in the other plane is large - is discovered.
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