| Paper |
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Page |
| MOPPH023 |
Enhancing FEL Power with Phase Shifters
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69 |
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- A. Chao, Z. Huang
SLAC, Menlo Park, California
- D. F. Ratner
Stanford University, Stanford, Califormia
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Undulator taper is a well-known technique to increase the FEL efficiency past saturation by maintaining the resonant condition. In this paper, we demonstrate that shifting the electron bunch phase relative to the radiation is equivalent to tapering the undulator parameter. Using discrete phase changes derived from optimized undulator tapers for the LCLS x-ray FEL, we show that placing appropriate phase shifters between undulator sections can reproduce the power enhancement of these undulator tapers. The phase shifters are relatively easy to implement and operate, and hence can be used to aid or replace the undulator taper for optimizing the FEL performance.
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