Laser cooling of electron beam and free electron laser using las

Details Laser cooling of electron beam and free electron laser using las Laser cooling of electron beam and free electron laser using las

1985-09-16

1987-08-18

Scott, Jr., Leon

Coherent light generators

Free electron laser

372 34, 372 70, H01S 300

Patent

active

046882278

ABSTRACT:
A method of cooling an electron beam with electrons having energies in excess of 10 MeV by directing a cooling laser beam over the path of the electron beam so as to achieve Compton scattering interactions, and a device which utilizes this method with other elements to produce a free electron laser system having much greater efficiencies than a single pass free electron laser. This system combines means for producing an electron beam having a narrow energy spectrum in the range above 10 MeV, means for extracting energy from the beam in the form of electromagnetic radiation; means for accelerating the electron beam to replace the energy lost in the extraction means, an optical resonance cavity surrounding the extraction means for producing an output laser from the electromagnetic radiation; electron beam transport means for directing said electron beam in a recirculation loop through the acceleration means and the extraction means; a cooling laser means for generating a cooling laser beam with a laser radiation intensity in excess of 1 times 10.sup.7 V/cm; a laser beam transport means for directing said cooling laser in a reflection path a portion of which is substantially the same as a portion of the electron beam recirculation loop so as to achieve Compton scattering interactions between some of the cooling laser photons and some of the electron beam electrons whereby the Compton scattering interactions reduces the spreading of the energy spectrum of the electron beam caused by the action of the extraction means.

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