Gas-loaded free-electron laser experiments on the Stanford superconducting accelerator

Author

Özcan, M. ; Pantell, Richard H. ; Feinstein, Joseph ; Ho, A.H.

Author_Institution

Dept. of Electr. Eng., Stanford Univ., CA, USA

Volume

27

Issue

2

fYear

1991

fDate

2/1/1991 12:00:00 AM

Firstpage

171

Lastpage

173

Abstract

The modification of the free-electron laser (FEL) on the Stanford superconducting accelerator to operate as a gas-loaded FEL (GFEL) is described. The addition of a gas to the wiggler chamber of a FEL changes the phase velocity of the electromagnetic wave, and so provides a simple method for wavelength tuning without changing beam energy or wiggler parameters. A wavelength shift of over 950 Å has been achieved from a vacuum wavelength of 1.6 μm by using 15 torr of hydrogen gas, in agreement with the GFEL synchronism condition incorporating the index of refraction of the gas

Keywords

free electron lasers; laser tuning; particle accelerator accessories; 1.6 micron; 15 torr; GFEL synchronism condition; H₂ gas; Stanford superconducting accelerator; beam energy; electromagnetic wave; gas loaded free electron laser; index; phase velocity; refraction; vacuum wavelength; wavelength shift; wavelength tuning; wiggler chamber; wiggler parameters; Acceleration; Free electron lasers; Gas lasers; Helium; Laser beams; Laser tuning; Optical refraction; Optical scattering; Refractive index; Undulators;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/3.78217

Filename

78217