ETEAPOT：全电储存环的辛轨道/自旋跟踪程序
ETEAPOT: symplectic orbit/spin tracking code for all-electric storage rings
摘要：
用于测量质子电偶极矩（EDM）的拟议方法使用存储在全电存储环“陷阱”中的强烈极化质子束。在232.792 MeV的“神奇”动能下，质子自旋被“冻结”，例如总是平行于瞬时粒子动量。本文介绍了一个加速器模拟程序ETEAPOT，一个新的组件的统一加速器库（UAL），用于长期跟踪的粒子轨道和自旋的电弯曲加速器，以模拟EDM储存环实验。虽然在性质上与磁环非常相似，但带电环中的非恒定粒子速度赋予它们显著不同的性质，特别是在弱聚焦环中。像早期的代码TEAPOT（磁环模拟），这个代码执行\emph{exact tracking in an idealized (approximate) lattice}，而不是更传统的方法，这是\emph{approximate tracking in a more nearly exact lattice.}的BMT方程描述的自旋矢量通过理想化的弯曲元素的演变也完全解决了-本文的原创。此外，理想化允许代码是完全辛的（没有人为的“辛化”）。任何残余的寄生阻尼或反阻尼都足够小，以允许长时间的可靠跟踪，例如在估计可实现的EDM精度时假设的1000秒。
英文摘要：
Proposed methods for measuring the electric dipole moment (EDM) of the proton use an intense, polarized proton beam stored in an all-electric storage ring "trap". At the "magic" kinetic energy of 232.792 MeV, proton spins are "frozen", for example always parallel to the instantaneous particle momentum. This paper describes an accelerator simulation code, ETEAPOT, a new component of the Unified Accelerator Libraries (UAL), to be used for long term tracking of particle orbits and spins in electric bend accelerators, in order to simulate EDM storage ring experiments. Though qualitatively much like magnetic rings, the non-constant particle velocity in electric rings give them significantly different properties, especially in weak focusing rings. Like the earlier code TEAPOT (for magnetic ring simulation) this code performs \emph{exact tracking in an idealized (approximate) lattice} rather than the more conventional approach, which is \emph{approximate tracking in a more nearly exact lattice.} The BMT equation describing the evolution of spin vectors through idealized bend elements is also solved exactly---original to this paper. Furthermore the idealization permits the code to be exactly symplectic (with no artificial "symplectification"). Any residual spurious damping or anti-damping is sufficiently small to permit reliable tracking for the long times, such as the 1000 seconds assumed in estimating the achievable EDM precision.
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