Design, measurement and correction of a pair of novel focusing undulators for the ALPHA-X project
Design, measurement and correction of a pair of novel focusing undulators for the ALPHA-X project
复制标题
为 ALPHA-X 项目设计、测量和校正一对新型聚焦波荡器
DOI：
10.1016/j.nima.2011.05.029
复制
发表时间：
2011
影响因子：
1.4
通讯作者：
J. Clarke
中科院分区：
文献类型：
--
作者：
B. Shepherd;J. Clarke
ALPHA-X是英国合作开发和建造原型激光等离子体加速器。ALPHA-X束线产生能量为0.1-1GeV的电子束团;这被注入到一对永久磁铁波荡器中以产生短脉冲辐射。本文详细介绍了波荡器的设计。波荡器需要沿其长度沿着聚焦光束。分析了几种聚焦方案。该方案使用的磁体块顶部有一个5× 1 mm的槽，以提供一个六极型磁场。波荡器在STFC的达雷斯伯里实验室制造和测试。对每一个进行了一些块交换，以减少整体场积分并优化光束传输。第一场积分减少使用这种技术小于0.1Tmm的两个波荡器。
ALPHA-X is a UK collaboration to develop and build a prototype laser-plasma accelerator. The ALPHA-X beam line generates an electron bunch with energy 0.1–1GeV; this is injected into a pair of permanent magnet undulators to generate a short pulse of radiation. The design of the undulators is detailed in this paper. The undulators have a requirement to focus the beam along their length. Several focusing schemes were analysed. The scheme used involved magnet blocks with a 5×1mm slot cut into the top to provide a sextupole-type field. The undulators were built and tested at STFC's Daresbury Laboratory. Some block swapping was carried out for each one to reduce the overall field integrals and optimise the beam transport. The first field integral was reduced using this technique to less than 0.1Tmm for both undulators.