Beam-based alignment for the LCLS FEL undulator

被引：34

作者：

Emma, P ^{[1
]}

Carr, R ^{[1
]}

Huhn, HD ^{[1
]}

机构：

[1] Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 1999年 / 429卷 / 1-3期

关键词：

D O I：

10.1016/S0168-9002(99)00117-5

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The linac coherent light source (LCLS) (LCLS Design Study Report, SLAC-R-521, 1998) is an X-ray FEL based on a long, permanent magnet undulator comprised of multiple segments which provide space for electron beam position monitors (BPMs) and quadrupole focusing magnets. The 15 GeV electron trajectory within the undulator must be straight to similar to 5 mu m over a gain length of 11 m so that the photon beam overlaps efficiently with the electron beam. This alignment precision is not achievable with available mechanical survey methods. For this reason, an empirical beam-based alignment technique is developed that uses BPM readings in conjunction with large, deliberate variations in the electron energy. We describe here a detailed alignment simulation including BPM and magnet-mover calibration errors, quadrupole gradient errors, and dipole field errors which demonstrate that the alignment can be achieved with high confidence. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：407 / 413

页数：7