Beam diagnostics at the BESSY I electron storage ring with Compton backscattered laser photons: measurement of the electron energy and related quantities
Beam diagnostics at the BESSY I electron storage ring with Compton backscattered laser photons: measurement of the electron energy and related quantities
复制标题
使用康普顿背散射激光光子对 BESSY I 电子存储环进行束流诊断：测量电子能量和相关量
DOI：
10.1016/s0168-9002(96)00899-6
复制
发表时间：
1997
影响因子：
1.4
通讯作者：
G. Ulm
中科院分区：
文献类型：
--
作者：
R. Klein;T. Mayer;P. Kuske;R. Thornagel;G. Ulm
位于柏林-威尔默斯多夫的电子储存环BESSY I被联邦物理技术局（PTB）用作真空紫外和软X射线光谱范围内的主要辐射源标准。这需要确定的存储环参数的光谱光子通量的计算与小的相对不确定性。在此框架内，一个新的设置用于测量电子能量的描述：CO2激光散射的正面碰撞的电子束中的电子存储环和背散射的光子测量与能量校准的高纯锗（HPGe）探测器。测量的康普顿谱的高能边缘的精确能量和形状然后可以用于确定电子能量以及电子束能量扩展和相关的存储环参数。此外，在BESSY I，我们有独特的可能性，测量电子能量的替代方法的共振自旋去极化。通过比较这两种方法得到的结果，在2×10−4的综合相对不确定度内，结果是一致的。目前的实验装置在储存环BESSY I和第一个实验结果的概述。
The electron storage ring BESSY I in Berlin-Wilmersdorf is used by the Physikalisch-Technische Bundesanstals (PTB) as a primary radiation source standard in the vacuum-UV and soft X-ray spectral range. This requires the determination of the storage ring parameters relevant to the calculation of the spectral photon flux with small relative uncertainties. Within this framework, a new set-up for measuring the electron energy is described: CO2-laser light is scattered in a head-on collision with the electron beam in the electron storage ring and the backscattered photons are measured with an energy-calibrated high-purity germanium (HPGe) detector. The exact energy and shape of the high energy edge of the measured Compton spectrum can then be used to determine the electron energy and also the electron beam energy spread and related storage ring parameters. Moreover, at BESSY I, we have the unique possibility of measuring the electron energy by the alternative method of resonant spin depolarization. Comparison of the results obtained by these two techniques shows agreement within the combined relative uncertainties of 2×10−4. An overview of the current experimental set-up at the storage ring BESSY I and first experimental results are given.