Separation of energy fractions of an electron beam by a localized nonuniformity of magnetic field in the collector region of gyrodevices

Abstract

To separate the energy fractions of an electron beam, we propose that a ferromagnetic ring coaxial to the solenoid is inserted in the collector region, which can increase the efficiency of energy recovery in the case of electron deposition onto the multistage collector.

Coaxial multistage depressed collector design for high power gyrotrons based on E×B concept

“…The first one is the symmetric concept which involves special demagnetization processes at the collector 8,19,20 , while the second one is based on the E×B drift approach 5 . This second approach has some advantages, such as a small influence of secondary electrons, insensitivities to the energy distribution, stray magnetic field and misalignments, as it is extensively discussed in Ref.…”

Gyrotron multistage depressed collector based on E × B drift concept using azimuthal electric field. I. Basic design

“…A nonadiabatic transition of the magnetic field helps to reduce the required space and can further spread the electron beam spatially. [8][9][10] Second, fusion gyrotrons have annular electron beams with small orbits. If the electric and magnetic scalar potentials are axisymmetric, the magnetic flux enclosed in the electron beam is constant (Busch theorem).…”