Title :
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
fDate :
2/1/1991 12:00:00 AM
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;
Journal_Title :
Quantum Electronics, IEEE Journal of
