Electron-optical system for submillimeter-wavelength Large Orbit Gyrotron

Author

Bratman, Vladimir L. ; Kalynov, Yuriy K. ; Manuilov, Vladimir N. ; Samsonov, Sergey V.

Author_Institution

Inst. of Appl. Phys., Nizhny Novgorod, Russia

fYear

2004

fDate

18-23 July 2004

Firstpage

502

Lastpage

505

Abstract

A modified thermionic gun with a high compression (up to 4,000) forms a 250 keV/4 AIIO μS rectilinear electron beam with current density of 25 kA/cm². Pumping the electron beam in a kicker followed by the increase of transverse electron velocity in a tapered magnetic field results in particle pitch-factor of 1. Use of such a helical beam in test experiments with a Large Orbit Gyrotron (LOG) has resulted in generation at the second cyclotron harmonic with the frequency of 240 GHz, output power of 45 kW and efficiency of 6 %. Generation at the third harmonic with the frequency of 375 GHz was problematic because of parasitic generation at the fundamental cyclotron resonance.

Keywords

cyclotrons; electron beams; gyrotrons; harmonic generation; magnetic fields; thermionic tubes; cyclotron resonance; electron-optical system; frequency 240 GHz; frequency 375 GHz; helical beam; magnetic field; parasitic generation; particle pitch-factor; power 45 kW; rectilinear electron beam; second cyclotron harmonic; submillimeter-wavelength large orbit gyrotron; thermionic gun; third harmonic generation; transverse electron velocity;

fLanguage

English

Publisher

ieee

Conference_Titel

High-Power Particle Beams (BEAMS 2004), 2004 International Conference on

Conference_Location

St. Petersburg

Print_ISBN

978-5-87911-088-3

Type

conf

Filename

6220591