Study of RF Generation Propagation and Extraction in High Frequency High Power Gyro devices

Abstract

This thesis is presented to the studies related to RF generation, propagation and extraction in a high frequency, high power Gyrotron, particularly, 120 GHz, 1 MW Gyrotron. The research study is also extended for Ka-band Gyro-TWT. The study is mainly confined to Gyrotron and Gyro-TWT due to their indigenous requirements. newlineAt present the Gyrotron is used almost in every plasma fusion machine as a high power millimeter wave source for electron cyclotron resonance heating (ECRH). Plasma tokamak is being planned for up gradation to develop the technology to convert fusion plasma into electricity efficiently. The research in the field of microwave tubes including the Gyrotron is a strategic aspect and thus the international design and development technology is exclusive. The specific Gyrotron design tools developed by various research institutes are not available and thus for the development of Gyrotron in India, an indigenous design and development technology is certainly required and finally developed. In this process, the commercially available electromagnetic simulators are employed according to the specific problems and a new computer program is indigenously developed on the basis of available Gyrotron theory. Further, in this process various new theoretical and experimental approaches are grown to support the indigenously developed design technology. newlineThe thesis presents some issues related to interaction structure, mode converter and RF window of Gyro-devices like Gyrotron, Gyro-TWT, etc. by modeling, simulation, theory development, etc. and to contribute some knowledge in the real scenario of the design and development of Gyro-device. newlineIn the thesis, the indigenous design methodology is developed for the interaction structure, the mode converter and the RF window for 120 GHz, 1 MW Gyrotron which is an ongoing activity at CEERI under a national scheme. An attempt has also been made to study Ka-band Gyro-TWT too related to interaction structure and RF Window. The thesis work is covered in six chapters and