DESIGN STUDIES OF A 250 GHz, 50-100 W, CW

SECOND HAMONIC GYROTRON

M.V. Kartikeyan^a, E. Borie^b, M. Thumm^b,c

^aDepartment of Electronics and Computer Engineering

Indian Institute of Technology, Roorkee 247 667, India

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

^bForschungszentrum Karlsruhe

Institut fuer Hochleistungsimpuls- und Mikrowellentechnik

Postfach 3640, D 76021 Karlsruhe, Germany

(E-mail: borie@ihm.fzk.de)

^cUniversitaet Karlsruhe, Institut fuer Hoechstfrequenztechnik und Elektronik,

Kaiserstraße 12, 76131 Karlsruhe, Germany

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

ABSTRACT

The design concept of a 250 GHz, 50-100 W, CW, second harmonic gyrotron for spectroscopy will be presented in this paper. Mode competition and mode selection procedures are carefully investigated by considering various candidate modes. The TE_6,2 / TE_6,3 modes are chosen as probable operating modes. Cold cavity design and self-consistent calculations are carried out and power and efficiency are computed for a typical set of beam parameters for these two modes. The results show that an output power of well over 50-100 W, CW can be achieved.