PROGRESS IN THE DEVELOPMENT OF THE 170 GHz COAXIAL CAVITY GYROTRON

B. Piosczyk¹, A. Arnold¹, H. Budig¹, G. Dammertz¹, O. Dumbrajs³, S. Illy¹, J. Jin¹, W. Leonhardt¹, G. Michel⁴,

T. Rzesnicki¹, M. Schmid¹, M. Thumm^1,2 and X. Yang¹

The fabrication phase of an industrial prototype of a 2 MW, CW 170 GHz coaxial cavity gyrotron started recently. To verify the design of critical components of the prototype, the previously used 165 GHz short pulse coaxial tube has been redesigned for operation at 170 GHz. The main components (cavity, launcher and mirrors) are same or very similar as designed for the prototype. The gyrotron operation which started recently was strongly hindered by excitation of parasitic low frequency (LF) oscillations mainly at 260 and 330 MHz. The LF oscillations seem to be excited inside the mirror box.