TITLE

Helical distributed feedback free-electron laser

AUTHOR(S)
Akiba, Tatsuro; Tanaka, Katsuya; Mokuno, Masaaki; Miyamoto, Shuji; Mima, Kunioki; Nakai, Sadao; Kuruma, Shinichiro; Imasaki, Kazuo; Yamanaka, Chiyoe; Fukuda, Masahiko; Ohigashi, Nobuhisa; Tsunawaki, Yoshiaki
PUB. DATE
February 1990
SOURCE
Applied Physics Letters;2/5/1990, Vol. 56 Issue 6, p503
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Results of the implementation of a distributed feedback (DFB) reflector in a free-electron laser (FEL) are described. The reflector was positioned in the interaction region of the FEL waveguide in order to produce narrow bandwidth features in the output spectrum. Both the DFB and wiggler were of helical configuration. The energy, current, and pulse width of the electron beam were 1.5 MeV, 100 A, and 50 ns. By employing the DFB structure the intensity of the two specific frequencies may be increased by factors of 3 and 5. These frequencies are in good agreement with those predicted by theory. Temporally radiation waveforms exhibit a double peak, revealing a sensitivity of the oscillation condition to beam energy.
ACCESSION #
9833613

 

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