ISSN 2224-087X (Print)
ISSN 2224-0888 (Online)

Collected scientific papers
"Electronics and information technologies"

(In 1966-2010 published under the title "Electrical engineering")

(Certificate of State Registration 17618-6468 from February 11, 2011)

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Issue 8

Issue 8, Pages: 118-126
Optimization of permanent magnet focusing system for submm clinotrons
K. Ilyenko, Yu. Novosel, T. Yatsenko
We propose to use optimized composite permanent magnet and iron insert focusing system that provides not only for a simpler assembly of the magnet pole pieces but also for insertion of more magnet material magnetized longitudinally into the preferable spatial positions. This has the potential of reducing total mass of the current in-house design (for the same given on-axis value of guide magnetic field) for modern compact submm-waveband clinotrons and other vacuum electron devices under development at the Department of Vacuum Electronics of O. Ya. Usikov IRE NAS of Ukraine by about 25 - 30 per cent while also decreasing the overall size of the magnet assembly as it allows us to put much less magnet material at larger transverse radial positions (where it is much less efficient in terms of mass-dimensional characteristics). To achieve such a goal, we use the known method of multiple decomposition of the permanent magnet system space together with our own developed methodology of geometric similarity based on the fact that magnetic field in a given point of space depends as the inverse cube of the distance to that point from the volume element with magnet material and is simultaneously proportional to the value of the volume of magnet material that creates the magnetic field. Major advantage of the proposed here design lies in the realization of the fact that iron field concentrators inserted in the both pole pieces of the focusing system, and used to avoid manufacturing complications of choosing the optimal magnetization angles for magnet material placed in different spatial positions of the system, may not occupy the total axial distance in each pole piece but can be reduced without loss of their efficiency to a portion of the axial distance whereas the rest of the axial distance could be fitted with magnet material magnetized in the optimal (longitudinal) direction. This either enhances the value of the guide magnetic field in the operational volume of the permanent magnet focusing system or can be used to remove less efficient magnet material from other parts of the permanent magnet focusing system thus reducing its overall mass and dimensions. A certain attention needs to be paid when choosing an appropriate model in optimization efforts as the iron concentrators are nonlinear elements. Optimization calculations were checked using the package CST Electromagnetic Studio.
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