STATUS OF THE NOVOSIBIRSK HIGH POWER TERAHERTZ FEL*

The first stage of Novosibirsk high power free electron laser (FEL) has been commissioned in 2003. It is based on the normal conducting CW energy recovery linac (ERL). Now the FEL provides electromagnetic radiation in the wavelength range 120- 230 micron. The maximum average power is 400 W. The minimum measured linewidth is 0.3%, which is close to the Fourier-transform limit. Four user stations are in operation now. Manufacturing of the second stage of the FEL based on a four-track energy recovery accelerator is in progress