An electron beam formation and its structure in cyclotron wave converter
electron optics
Alexander V. Konnov
1, Gohar
Ì.
Kazaryan 2, Dimitri
À.
Mikheev 2, Vladimir L. Savvin 2,
Tatiana I. Chernobay
3
1
FSUE “R&P Corp. ”Toriy”, Moscow
2
M. V. Lomonosov Moscow state university, physics faculty, chair
of photonics and microwave physics
3 FSUE “R&P Corp. ”Istok”, Fryazino,
Moscow region
Received
May 24, 2012
Abstarct.
Ñyclotron wave converter
electron optics including electron gun with spherical impregnated cathode and
magnetic system consisting of ring permanent magnets with radial magnetization
is designed. The electron beam potential is 2000 V and cathode current is 0.14
A. 3D-simulation of the electron beam trajectories in the gun region is done.
The best confinement condition is obtained by zero cathode magnetic fields. In
this regime the beam envelope ripples are not more then 7%. Different focusing
of near axis and peripheral particles led to the beam halo formation. The halo
keeps about 10% of beam current. Ii is shown that for the correct computation
of the cathode current is necessary to take into account the cathode kern
thermal shift.
Keywords:
microwave
irradiation, cyclotron wave converter, electron gun, electron optics, electron
beam formation, beam current, electron beam transport, magnetic field, envelope
beam ripples, 3D-simulation.