EDM计划，使用ETEAPOT和复活的AGS电子锚环
EDM planning using ETEAPOT with a resurrected AGS Electron Analogue ring
摘要：
最近人们对直接测量质子和电子的电偶极矩（EDM）很感兴趣，这种测量需要在全电储存环中储存一束“冻结自旋”粒子的极化束。只有一个这样的相对论性电子加速器曾经被建造-“电子加速器”环在布鲁克海文国家实验室于1954年。碰巧的是，这个电子环，很久以前就被拆除了，既适合测量电子EDM，也适合作为一个廉价的原型，用于更有前途的，但要贵十倍的质子EDM测量。今天，通过计算机模拟其性能来“复活”电子增强环的成本更低。这是本文的目的之一。为了建立这些计算，需要一种“考古物理学”来重建详细的电子反晶格设计。新的UAL/ETEAPOT代码，详细介绍了在所附的文件中，已开发的建模存储环的性能，包括（确切的BMT）自旋演化，在电环。说明它的使用，比较它的预测与旧的观察，并描述有关自旋演化和代码性能的新的期望，是本文的其他目标。本文介绍了ETEAPOT程序的实际应用，并提供了一些示例结果，重点是在AGS Anchoring中模拟晶格光学，以便与历史上的机器研究进行比较，并预测它们将测量的电子自旋演化。为了展示ETEAPOT代码的性能，并确认其symplecticity，结果也给出了30万转质子自旋跟踪在一个全电晶格，这将是适合于目前的测量质子EDM。
英文摘要：
There has been much recent interest in directly measuring the electric dipole moments (EDM) of the proton and the electron. Such a measurement will require storing a polarized beam of "frozen spin" particles in an all-electric storage ring. Only one such relativistic electric accelerator has ever been built---the "Electron Analogue" ring at Brookhaven National Laboratory in 1954. By chance this electron ring, long since dismantled, would have been appropriate both for measuring the electron EDM and to serve as an inexpensive prototype for the arguably more promising, but ten times more expensive, proton EDM measurement. Today it is cheaper yet to "resurrect" the Electron Analogue ring by simulating its performance computationally. This is one purpose for the present paper. To set up these calculations has required a kind of "archeological physics" to reconstitute the detailed Electron Analogue lattice design. The new UAL/ETEAPOT code, described in detail in an accompanying paper, has been developed for modeling storage ring performance, including (exact BMT) spin evolution, in electric rings. Illustrating its use, comparing its predictions with the old observations, and describing new expectations concerning spin evolution and code performance, are other goals of the paper. This paper describes the practical application of the ETEAPOT code and provides sample results, with emphasis on emulating lattice optics in the AGS Analogue ring for comparison with the historical maching studies and to predict the electron spin evolution they would have measured. To exhibit the ETEAPOT code performance and confirm its symplecticity, results are also given for 30 million turn proton spin tracking in an all-electric lattice that would be appropriate for a present day measurement of the proton EDM.
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