Regenerative ultraviolet driven photocathode

Details Regenerative ultraviolet driven photocathode Regenerative ultraviolet driven photocathode

1989-09-28

1990-11-20

Scott, Jr., Leon

Coherent light generators

Free electron laser

372 74, 372 87, H01S 300

Patent

active

049724193

ABSTRACT:
A device to provide high current, low emittance electron beams with a long life cathode. The device consists of an undulator 7 which provides a source of ultraviolet light 15 for an ultraviolet photocathode 8. The undulator 7 needs a supply of electrons to produce the ultraviolet light which it can get by diverting a portion of a beam from a linear accelerator 3 before E.sub.3 or after E.sub.4 the electron beam traverses a free electron laser 5. The device is self-maintaining once a source of electrons is developed but needs a start-up source of electrons. The start up source can be provided by a pulsed cathode electron gun 1 which has to be on for a short period of time until the ultraviolet photocathode 8 is operated. Alternatively, the start-up source can be achieved by irradiating the UV photocathode 8 by ultraviolet light from a conventional laser 9, which can be aimed through the undulator 7 and subsequently provide a seed UV laser beam at lower power to assist regeneration of the high power UV beam in the undulator. In another embodiment UV light 15 can be sent directly from the free electron laser 5 to ultraviolet photocathode 8.

REFERENCES:
patent: 4077017 (1978-02-01), Gilson et al.
patent: 4641103 (1987-02-01), Madey et al.
Curtin et al., "First Demo of Free Electron Laser Driven by Electrons from a Laser Irradiated Photocathode", Proceed of Inter. Conf on Lasers 3/88.
First Demonstration of a Free-Electron Laser Driven by Electrons from a Laser Irradiated Photocathode-Mark Curtin, Glenn Bennett, Stephen Burke and J. J. Madey, Dec. 1, 1988, "Lasers 88", pp. 196-204.
Pulsed Photocurrents from Lanthum Hexaboride Cathodes in the ns Regime M. Boussoukaya, H. Bergert, R. Chehab and B. Leblond Nuclear Instruments and Methods in Physics Research A264 (Mar. 1988), pp. 131-134.

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