Beam-Based Alignment of the NLC Main Linac, Part Two: Dispersion-Free Steering and Dispersion Bumps.

Tenenebaum, P.

Technical Information Center Oak Ridge Tennessee

关键词: Linear accelerators;    Alignment;    Beam steering;    Magnets;    Dispersion;   

RP-ID  :  DE2004826568

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The standard prescription for NLC main linac steering assumes that the RMS offset between a quad's magnetic center and the corresponding BPM's electrical center can be determined at the level of a micron. This is a fearsome requirement, and will be particularly difficult to achieve if hybrid iron/permanent magnet quads are used in the main linac. As an alternative, the Dispersion Free Steering (DFS) algorithm is adapted to the NLC main linac environment; the DFS algorithm does not require knowledge of the quad-BPM offsets. The results of simulation studies of this adaptation are presented. In addition, the use of closed orbit bumps to globally correct dispersive emittance growth is considered.