Description
We have proposed a new method to generate coherent soft X-ray free electron lasers by the reverse-taper enhanced cascade echo-enabled harmonic generation. The method is based on the typical EEHG technique and a latter harmonic undulator section to lase the harmonic of the EEHG output. By using the reverse-tapered undulator at the EEHG undulator, an optimised FEL will be generate at the second stage.
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