FEASIBILITY OF A 140 GHz, 2-3 MW, CW COAXIAL GYROTRON

WITH DUAL BEAM OUT PUT

M.V. Kartikeyan^a, B. Piosczyk^b, and M.K.A. Thumm^a,c

^aDepartment of Electronics and Computer Engineering

Indian Institute of Technology, Roorkee 247 667, India

(E-mail: kartkfec@iitr.ernet.in)

^bForschungszentrum Karlsruhe

Institut für Hochleistungsimpuls- und Mikrowellentechnik

Postfach 3640, D 76021 Karlsruhe, Germany

(E-mail: bernhard.piosczyk@ihm.fzk.de)

^cUniversität Karlsruhe, Institut für Hoechstfrequenztechnik und Elektronik,

Kaiserstraße 12, 76128 Karlsruhe, Germany

(E-mail: manfred.thumm@ihm.fzk.de)

ABSTRACT

Recent experiments at FZK and IAP Nizhny Novgorod suggest that coaxial cavity gyrotrons delivering in excess of 2 MW power at frequencies ranging from 140-170 GHz operating with very high order volume modes can successfully be realized. In addition, some progress was made at FZK on the feasibility studies of super power coaxial gyrotrons giving powers in excess of 4 MW at 170 GHz with dual beam output. As its logical sequel, in this work, the feasibility of a coaxial cavity gyrotron at 140 GHz capable of giving powers around 2-3 MW, CW, operating in the ultra high asymmetric volume modes, is presented. These modes are capable of giving a perfect dual-beam output through two CVD diamond windows with a suitable pre-shaped dimpled-wall quasi-optical launcher which will eventually reduce the losses due to stray radiation inside the device.