Measurement of longitudinal acceptance and emittance of the Oak Ridge Spallation Neutron Source Superconducting Linac
Measurement of longitudinal acceptance and emittance of the Oak Ridge Spallation Neutron Source Superconducting Linac
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橡树岭散裂中子源超导直线加速器纵向接受度和发射度的测量
DOI：
10.1103/physrevstab.11.104001
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发表时间：
2008
影响因子：
--
通讯作者：
A. Shishlo
中科院分区：
文献类型：
--
作者：
Yan Zhang;J. Galambos;A. Shishlo
用纵向模型计算了散裂中子源超导直线加速器的纵向接受度。采用波束电流监测仪和波束损耗监测仪进行波束接受度测量，测量结果与模型吻合较好。在模拟实验的基础上，结合超导直线加速器的接受度测量，提出了一种测量直线加速器入口处束束形状、束流能量分布和纵向发射度的新方法。实验测量结果表明，超导直线加速器的注入光束存在较大的纵向光束晕，其纵向发射度约为标称设计的两倍。该测量方法简单，适用于其它直线机。
Longitudinal acceptance of the Spallation Neutron Source superconducting linac is computed with a longitudinal model. Beam Current Monitor and Beam Loss Monitors are utilized in the beam acceptance measurements, and the measured results show close agreement with the model. Based on the simulations and on the measurements of the acceptance of the superconducting linac, we developed a novel method to measure beam bunch shape, beam energy profile and the longitudinal emittance at the entrance of the linac. The experiment measurements reveal that a large longitudinal beam halo exists in the injection beams to the superconducting linac, and the longitudinal emittance is approximately twice that of the nominal design. The simple measurement method is applicable to other linacs.