A 100 MW ELECTRON SOURCE WITH EXTREMELY HIGH BEAM AREA COMPRESSION

The development at INP electron optical system for a 7 GHz magnicon in corporating the high voltage diode gun based on a 120 mm oxide cathode with microperveance of 0.83 and high electrostatic compression of a b eam as well as the guiding magnetic system are described here. The mai n problems and the concepts used for the formation of the super dense relativistic beam in the diode gun and its matching with magnetic syst em are described in detail. The geometry of the whole electron optical system is given and the results of numerical calculations for the bea m dynamics are described. The experimental results of the formation of electron beam and its transportation through the guiding magnetic sys tem are described. As a result of these experiments a beam of 100 MW ( U= 436 kV, I = 236 A) in a pulse of 2 mu s is obtained. The measured d iameter of a beam in magnetic system is about 2.5 mm and it is close t o that of the Brillouin's. Thus, the total measured compression of a b eam over area exceeds 2000, power density in a beam achieves 2000 MW/c m(2) and an energy density in a beam exceeds 4 kJ/cm(2)