arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1202.2409physics.acc-ph
收藏

考虑短程效应的一维相干同步辐射模型

A Model for One-Dimensional Coherent Synchrotron Radiation including Short-Range Effects

Robert D. Ryne, Bruce Carlsten, Ji Qiang, Nikolai Yampolsky

摘要:

提出了一种新的一维相干同步辐射(CSR)模拟模型。该方法是基于卷积的积分格林函数(IGF)的纵向电荷密度。由于它是基于IGF,这种方法的准确性是由如何解决电荷密度,而不是解决单粒子尾流函数。由于短程尾流场效应包括分析,该方法可以比普通(非IGF)的方法在尾流函数和电荷密度具有不同的空间尺度的情况下更有效。两种情况下:一个来自包括短程效应的全尾流,一个来自渐近尾流。在后一种情况下,该算法包含与基于渐近近似的其他算法相同的物理,但只需要线电荷密度而不是其导数。例子说明的渐近唤醒近似的局限性,并说明如何微聚束可以增加CSR字段的数量级取决于微聚束波长。

英文摘要:

A new model is presented for simulating coherent synchrotron radiation (CSR) in one dimension. The method is based on convolving an integrated Green function (IGF) with the longitudinal charge density. Since it is based on an IGF, the accuracy of this approach is determined by how well one resolves the charge density and not by resolving the single particle wake function. Since short-range wakefield effects are included analytically, the approach can be much more efficient than ordinary (non-IGF) approaches in situations where the wake function and charge density have disparate spatial scales. Two cases are presented: one derived from the full wake including short-range effects, and one derived from the asymptotic wake. In the latter case the algorithm contains the same physics as others based on the asymptotic approximation, but requires only the line charge density and not its derivative. Examples are presented that illustrate the limitations of the asymptotic-wake approximation, and that illustrate how microbunching can increase the CSR fields by orders of magnitude depending on the microbunching wavelength.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑