Strong focusing system of FELI 6-MeV electron injector used for ultraviolet range FEL oscillation

First lasings of free electron laser (FEL) at ultraviolet range were achieved by using an electron linac with a thermionic gun. The gun is driven by a 22.3125 MHz, 0.5 ns wide, 150 V grid pulser. A short-bunching and strong-focusing system of the injector and a stable 24 μ s RF system allow lasing a...

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Published inNuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 407; no. 1; pp. 370 - 373
Main Authors Tomimasu, T, Morii, Y, Oshita, E, Okuma, S, Nishihara, S, Takii, T
Format Journal Article
LanguageEnglish
Published Elsevier B.V 21.04.1998
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Summary:First lasings of free electron laser (FEL) at ultraviolet range were achieved by using an electron linac with a thermionic gun. The gun is driven by a 22.3125 MHz, 0.5 ns wide, 150 V grid pulser. A short-bunching and strong-focusing system of the injector and a stable 24 μ s RF system allow lasing at 278 nm in spite of a small signal gain of 6%. The maximum focusing field is 0.11–0.12 T near the inlet of the buncher. The axial field distribution gives severe effect on lasing.
ISSN:0168-9002
1872-9576
DOI:10.1016/S0168-9002(98)00052-7