A.A. Shvachko − Ph.D.(Eng.), Associate Professor, 

Department of Electronic Devices, Yuri Gagarin State Technical University of Saratov

E-mail. Alexandr1899@gmail.com

A.A. Zakharov – Dr.Sc.( Eng.), Professor, 

Department of Electronic Devices, Yuri Gagarin State Technical University of Saratov

E-mail: zaharov@sstu.ru 

A.A. Potapov - Postgraduate Student, 

Department of Electronic Devices, Yuri Gagarin State Technical University of Saratov

E-mail: potapov_andrey13@mail.ru

This paper deals with the problem of setting the magnetic focusing system. When the periodic magnetic focusing system of the traveling wave tube is initially the primary setting, the distribution of the longitudinal component of the magnetic field is measured first. The magnitude of the magnetic field portion of magnets exits the desired magnetic field range in excess value and less value. Adjustment of the magnetic field focusing system produce partial demagnetization or magnetization magnets required focusing system. Then followed by heat treatment at elevated temperatures of the magnets in order to stabilize and consolidate the achieved values. Sometimes after such processing, due to the physical and chemical processes in the material, the magnetic system is upset again. This fact makes it necessary to repeat setting procedure several times, and in time it often takes up to one day.The article describes an alternative method of setting the periodic magnetic focusing system based on the selection of the optimal placement of the magnets. Under this method, magnets are permuted among themselves to create the necessary magnetic field distribution on the axis. A mathematical model describing the magnetic field on the axis of the focusing system and takes into account the magnetic fields of each individual magnet. As an example, modeled tuning focusing system consisting of ten magnets. The results are shown in graph form the longitudinal component of the magnetic field on the axis, and tables, which indicate numerical values of the magnetic field of each magnet and the magnetic field on the axis at the corresponding point.

Shvachko A.A., Zakharov A.A., Potapov A.A. Configuring multi-element periodic magnet focusing system based on optimal magnet placement. Radiotekhnika. 2020. V. 84. № 8(15). P. 21−. DOI: 10.18127/j00338486-202008(15)-03.

1. Mel'nikov Ju.A. Postojannye magnity jelektrovakuumnyh SVCh-priborov. M.: Sov. Radio. 1967. 183 s. (In Russian).
2. Danovich I.A., Mitus A.F. Uskorenie processa nastrojki periodicheskih magnitnyh sistem. Jelektronnaja tehnika. Ser. 1. Jelektronika SVCh. 1979. № 4. S. 26-32 (In Russian).
3. Shvachko A.A., Zaharov A.A., Afonin I.N., Turkin Ja.V. Matematicheskaja model' nastrojki MPFS metodom perestanovki magnitov. Radiotehnika. 2016. № 10. S. 203-206 (In Russian).
4. Chang K. Optimum design of periodic magnetic structures for electron beam focusing. RCA Rev. 1955. V. 16. № 1. P. 65-81.
5. Kogen-Danilin V.V., Komarov E.V. Raschet i ispytanija sistem s postojannymi magnitami. M.: Jenergija. 1977. 247 s. (In Russian).
6. Grishin B.S. Jempiricheskaja formula dlja rascheta polja sistemy periodicheskih postojannyh magnitov. Jelektronnaja tehnika. Ser. 1. SVCh-tehnika. № 1. 1968. C. 157-160 (In Russian).
7. Danovich I.A. K raschetu magnitnyh sistem jelektronnyh priborov. Jelektronika SVCh. Ser. 1. SVCh-tehnika. № 1. 1970. C. 86-96.
8. Bittanti S., Colaneri P. Periodic systems: filtering and control. Springer Science & Business Media. 2009. 407 р. DOI: 10.1007/978-184800-911-0.
9. Zaharov A.A., Kivokurcev A.Ju., Spiridonov R.V. Sposob rascheta magnitnyh sistem s zakriticheskimi magnitami i nenasyshhennymi magnitoprovodami. Materialy Mezhdunar. nauch.-tehn. konf. «Aktual'nye problemy jelektronnogo priborostroenija». Saratov: SGTU. 2008. S. 404-409 (In Russian).
10. Carev V.A., Spiridonov R.V. Magnitnye fokusirujushhie sistemy jelektrovakuumnyh mikrovolnovyh priborov O-tipa: Ucheb. posobie dlja vuzov. Saratov: Novyj veter. 2010. 352 s. (In Russian).