First lasings at visible and IR range of linac-based FELs at the FELI

Author

Tomimasu, T. ; Oshita, E. ; Okuma, S. ; Wakita, K. ; Saeki, K. ; Zako, A. ; Suzuki, T. ; Miyauchi, Y. ; Koga, A. ; Nishihara, S. ; Nagai, A. ; Tongu, E. ; Wakisaka, K. ; Kobayashi, A. ; Yasumoto, M.

Author_Institution

Free Electron. Laser Res. Inst. Inc., Osaka, Japan

Volume

1

fYear

1995

Firstpage

257

Abstract

First lasings at 5.5 μm and 1.88 μm have been achieved in October 1994 and February 1995 at the FELI using two undulators installed at 30-MeV and 80-MeV undulator beam lines of the FELI S-band linac. Lasing on the third harmonics at 0.64 μm has been also observed. A thermionic triode gun of the linac emits 500 ps pulses of 2.3 A at 23.125 MHz. These pulses are compressed with a 714-MHz prebuncher, a 2856-MHz standing wave type buncher, and 3 m long accelerating waveguides to 42 A×10 ps. The 24-μs stable RF pulses can increase a conversion efficiency from electron beam power to FEL power at short wavelength FELs. At 5.5 μm, 1.88 μm and 0.63 μm, FEL peak power are 3 MW, 2 MW and 0.3 MW, and FEL spectral widths are 0.5%, 0.3% and 0.3%, respectively

Keywords

beam handling techniques; electron accelerators; electron guns; free electron lasers; thermionic electron emission; wigglers; 0.64 mum; 1.88 mum; 2.3 A; 23.125 MHz; 2856 MHz; 30 MeV; 5.5 mum; 500 ps; 714 MHz; 80 MeV; FELI S-band linac; accelerating waveguides; linac-based FELs; prebuncher; stable RF pulses; standing wave type buncher; thermionic triode gun; third harmonics; undulator beam lines; Acceleration; Cathodes; Costs; Electron beams; Free electron lasers; Klystrons; Laser beams; Linear particle accelerator; Radio frequency; Undulators;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1995., Proceedings of the 1995

Print_ISBN

0-7803-2934-1

Type

conf

DOI

10.1109/PAC.1995.504628

Filename

504628