FREE-ELECTRON LASER OPERATION IN THE WHISTLER-MODE

The introduction of a strongly magnetized plasma in the inner region o f a Free Electron Laser opens up the possibility of generating coheren t radiation in the slow whistler mode using mildly relativistic electr on beams. The frequency of emission, however, is limited to below the electron cyclotron frequency. The efficiency of the device can be enha nced by tapering the guide magnetic field.