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The tapered hybrid undulator (THUNDER) of the visible free-electron laser oscillator experiment

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3 Author(s)
Robinson, K. ; Spectra Technology, Inc., Bellevue, WA, USA ; Quimby, David C. ; Slater, J.

A 5 m tapered hybrid undulator (THUNDER) has been designed and built as part of the Boeing Aerospace Company and Spectra Technology, Inc. visible free-electron laser (FEL) oscillator experiment. The performance goals required of an undulator for a visible oscillator with large extraction are ambitious. They require the establishment of stringent magnetic field quality tolerances which impact design and fabrication techniques. The performance goals of THUNDER are presented. The tolerances resulting from the FEL interaction are contrasted and compared to those of a synchrotron radiation source. The design, fabrication, and field measurements are discussed. The performance of THUNDER serves as a benchmark for future wiggler/undulator designs for advanced FEL's and synchrotron radiation sources.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:23 ,  Issue: 9 )