Other

University of Hawai'i

John M J Madey

Eric B Szarmes

Orion Crissafulli

The temperature rise due to the backstreaming electrons is canceled by an equal and opposite fall in temperature at the surface of the cathode due to the conduction of heat deposited at the surface immediately prior to the microwave pulse by a pulsed laser focused to uniformly illuminate the cathode surface. Variations in temperature across the surface of the cathode attributable to the non-uniform spatial distribution of the backstreaming electrons may be compensated using a second laser pulse fired during the RF pulse to maintain constant thermal power input across the surface of the cathode during the RF pulse. This second pulse can also be used to compensate for the time-dependent rate of decay of temperature due to conduction of the heat deposited by the first laser into the body of the cathode.

Temperature stabilized microwave electron gun

A method of generating energetic electromagnetic radiation comprises, during each of a plurality of separated radiation intervals, injecting laser radiation of a given wavelength into an optical cavity that is characterized by a round-trip transit time (RTTT) for radiation of that given wavelength. At least some radiation intervals are defined by one or more optical macropulses, at least one optical macropulse gives rise to an associated circulating optical micropulse that is coherently reinforced by subsequent optical micropulses in the optical macropulse and the electric field amplitude of the circulating optical micropulse at any given position in the cavity reaches a maximum value during the radiation interval.

High efficiency monochromatic X-ray source using an optical undulator

A free-electron laser (FEL), which in a preferred embodiment comprises a relativistic electron beam generator; an optical cavity capable of storing a co-propagating optical beam; an interaction region; a phase displacement device disposed in the interaction region; and an output coupler interposed in the optical cavity through which a predetermined portion of the co-propagating optical beam exits as a coherent output optical beam. In certain embodiments, an optical beam spectral filter may be interposed in the optical cavity. FEL components and methods of use are also disclosed. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope of meaning of the claims.

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Honolulu, HI, United States of America

John M J Madey