A CORRUGATED WAVE-GUIDE DRIVEN BY THE LINAC AS A PREBUNCHER AND SEED-POWER GENERATOR OF MM-WAVE FEL

We propose to use a corrugated waveguide, which is placed in the upstr eam of the wiggler, as a prebuncher and seed power generator of mm-wav e FEL. A compacted high-power, high-efficiency mm-wave FEL is expected by using such configuration. As the first step, the experiments of be am extraction and investigations of characteristics of the seed-power generator have been carried out with the 1 MV Lax-1 linac. The corruga ted waveguide is designed operating in frequency of 7.9 GHz driven by the Lax-1 linac. Peak output power of about 1.2 MW at 7.8 GHz is radia ted in a 50 ns pulse. (C) 1998 Elsevier Science B.V. All rights reserv ed.