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This dissertation focuses on the study of novel highgain freeelectron laser (FEL) operation schemes with external seed lasers. The technique of manipulating the phase space of the electron beam, which is widely used in novel seeded FEL schemes, is systematically studied. Several novel FEL schemes are proposed for the generation of intense coherent FEL pulses with short wavelength, subfemtosecond pulse length or multiple carrier frequency properties, which meet the needs of FEL users. Results of experiments are described for the recently proposed FEL schemes such as echoenabled harmonic generation and cascaded highgain harmonic generation. New photon/electron beam diagnostic methods are also developed for these experiments and future highgain FEL facilities.
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