The design of a 100-GHz CARM oscillator experiment

Author

McCowan, Robert B. ; Fliflet, Arne W. ; Gold, Steven H. ; Black, Murray W. ; Kinkead, A.K. ; Granatstein, Victor L. ; Sucy, Mark S.

Author_Institution

Naval Res. Lab., Washington, DC, USA

Volume

36

Issue

9

fYear

1989

fDate

9/1/1989 12:00:00 AM

Firstpage

1968

Lastpage

1975

Abstract

The design of a 10-20-MW 40-ns cyclotron autoresonance maser (CARM) is presented. The basic components of a CARM are a pulseline accelerator, magnetic-field coils, a novel 600-kV 200-A field-emission electron gun designed for p_⊥/p_z=0.6 and Δp_z/p_z<3% and a whispering-gallery mode rippled-wall cavity, designed for a high Q for the desired CARM mode and low Q for competing gyrotron modes. The Naval Research Laboratory CARM operates with a wave group velocity that is less than optimum for autoresonance, but where the cyclotron maser instability is strong. By keeping the interaction region short (less than ten cyclotron orbits), the effect of velocity spread is reduced, and the efficiency can be quite high; computer simulations indicate that the device can operate at efficiencies greater than 20%

Keywords

gyrotrons; masers; microwave oscillators; 10 to 20 MW; 100 GHz; 40 ns; CARM oscillator; Naval Research Laboratory; computer simulations; cyclotron autoresonance maser; efficiency; field-emission electron gun; gyrotron modes; magnetic-field coils; pulseline accelerator; velocity spread; wave group velocity; whispering-gallery mode rippled-wall cavity; Accelerator magnets; Coils; Cyclotrons; Electron accelerators; Gyrotrons; Laboratories; Masers; Orbits; Oscillators; Whispering gallery modes;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/16.34279

Filename

34279