Chaotic Orbit of Low Energy Charged Particles in a Compact Dipole Magnetic Field Configuration
Chaotic Orbit of Low Energy Charged Particles in a Compact Dipole Magnetic Field Configuration
复制标题
DOI：
10.1585/pfr.17.2401026
复制
发表时间：
2022-04
影响因子：
0.8
通讯作者：
H. Saitoh;Itsuki Tanioka
中科院分区：
文献类型：
--
作者：
H. Saitoh;Itsuki Tanioka
本文数值计算了用于正电子和电子-正电子等离子体实验的紧凑偶极阱中低能正电子混沌轨道出现的条件。由于其相对较弱的场强和在确认区域附近存在的磁性零线，即使对于这种捕获几何结构中的低能粒子，陀螺运动和反弹运动之间的耦合也很明显。第一和第二绝热不变量的击穿和由此产生的不可积混沌运动的动能低于10 eV的数量级的正电子实现。该动能值比环阱-1（RT-1）实验中混沌轨道的阈值小两个数量级。随机长轨道可用于紧凑型悬浮偶极实验中正电子的有效注入和压缩方案。
Conditions for the emergence of chaotic orbit of low energy positrons are numerically calculated in a compact dipole trap for use in positron and electron-positron plasma experiments. Due to its relatively weak field strength and existence of magnetic null line near the confinement region, coupling between gyro and bounce motions is pronounced even for low energy particles in this trapping geometry. Breakdown of first and second adiabatic invariants and the resultant non-integrable chaotic motion are realized for positrons with kinetic energy below the order of 10 eV. This kinetic energy value is two orders of magnitude smaller than the threshold value for a chaotic orbit in the Ring Trap-1 (RT-1) experiment. The stochastic long orbit is potentially applicable for e ffi cient injection and compression schemes of positrons in a compact levitated dipole experiment.