Optimization of a high efficiency FEL amplifier
E.A. Schneidmiller, M.V. Yurkov
TL;DR
This paper analyzes undulator tapering strategies to enhance the efficiency of high-power FEL amplifiers, deriving a universal law applicable across various FEL facilities and future applications.
Contribution
It introduces a universal law of undulator tapering for high-power FEL amplifiers based on similarity techniques, advancing the optimization of FEL efficiency.
Findings
Derived a universal law for undulator tapering
Enhanced understanding of tapering strategies for high-power FELs
Applicable to current and future FEL facilities
Abstract
The problem of an efficiency increase of an FEL amplifier is now of great practical importance. Technique of undulator tapering in the post-saturation regime is used at the existing x-ray FELs LCLS and SACLA, and is planned for use at the European XFEL, Swiss FEL, and PAL XFEL. There are also discussions on the future of high peak and average power FELs for scientific and industrial applications. In this paper we perform detailed analysis of the tapering strategies for high power seeded FEL amplifiers. Application of similarity techniques allows us to derive universal law of the undulator tapering.
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