High-precision beam alignment of electromagnet wigglers

Ilan Ben-Zvi; Xu Z. Qiu

doi:10.1117/12.164805

29 November 1993 High-precision beam alignment of electromagnet wigglers

Ilan Ben-Zvi, Xu Z. Qiu

Proceedings Volume 2013, Electron-Beam Sources of High-Brightness Radiation; (1993) https://doi.org/10.1117/12.164805
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

The performance of Free-Electron Lasers depends critically on the quality of the alignment of the electron beam to the wiggler's magnetic axis and the deviation of this axis from a straight line. The measurement of the electron beam position requires numerous beam position monitors in the wiggler, where space is at premium. The beam position measurement is used to set beam steerers for an orbit correction in the wiggler. We propose an alternative high precision alignment method in which one or two external Beam Position Monitors (BPM) are used. In this technique, the field in the elector-wiggler is modulated section by section and the beam position movement at the external BPM is detected in synchronism with the modulation. A beam offset at the modulated beam section will produce a modulation of the beam position at the detector that is a function of the beam offset and the absolute value of the modulation current. The wiggler errors produce a modulation that is a function of the modulation current. It will be shown that this method allows the detection and correction of the beam position at each section in the presence of wiggler errors with a good resolution.

Citation Download Citation

Ilan Ben-Zvi and Xu Z. Qiu "High-precision beam alignment of electromagnet wigglers", Proc. SPIE 2013, Electron-Beam Sources of High-Brightness Radiation, (29 November 1993); https://doi.org/10.1117/12.164805

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