Gyrotron Research Articles

IMPLEMENTATION OF TWO METHODS FOR DESIGNING THE PROFILES OF MIRRORS IN QUASI-OPTICAL MODE CONVERTER FOR 170 GHZ TRANSVERSE OUTPUT GYROTRON

IMPLEMENTATION OF TWO METHODS FOR DESIGNING THE PROFILES OF MIRRORS IN QUASI-OPTICAL MODE CONVERTER FOR 170 GHZ TRANSVERSE OUTPUT GYROTRON

A 94 GHz continuous operation second harmonic gyroton with 1.8 T solenoid

The continuous operation of a W-band gyrotron without superconduct magnet was realized. The gyrotron operated at the second harmonic cyclotron frequency. Its operational frequency was 94.08 GHz and the operating mode was TE02. The required 1.8 T magnetic field was generated by a DC solenoid cooled by water. The power consumption of the solenoid was 28 kW and the driving current was 500 A. The inner bore diameter was 66 mm. The gyrating electron beam was generated by a triode magnetic injection gun. A high efficiency internal quasi-optical mode converter was used to separate the wave from the electron beam. In the test, 5 min stable operation was realized. The output power was 12 kW with an electron beam of 45 kV, 1.7 A. The output efficiency was 15.7%.

2018 Status on KIT Gyrotron Activities

2018 Status on KIT Gyrotron Activities

Design of high voltage power supply and control system for gyrotron test bench

Electron Cyclotron Resonance Heating (ECRH) system is one of the most important Tokamak auxiliary heating methods. However, with the development of physical experiments progress, there are growing stringent requirements for ECRH system and high-voltage power supply system, at the same time, more difficulty of the control and protection of high-voltage power supply. In this paper, according to the requirements of -60 kV/50 A PSM high-voltage power supply, a control system based on MCU and FPGA is developed, which not only satisfies all working modes of the power supply system, especially the requirements of 1 kHz modulation, but also meets the requirements of logic control and fast protection for gyrotron test bench. The experimental results show good logic structure and reliable operation of the power supply and control system and it can fit the requirements of logic control, timing and fast protection for gyrotron test bench.

Гиротроны и гиро-ЛБВ на замедленной E 0i-моде гофрированного волновода

Гиротроны и гиро-ЛБВ на замедленной E 0i-моде гофрированного волновода

Optimization of distributed-loss circuit of gyrotron traveling wave amplifier using multi-objective genetic algorithm

The resistance and thickness of distributed-loss circuit of gyrotron traveling wave amplifier are optimized by using the multi-objective genetic algorithm. Maximum gain of 15.9 dB is obtained by optimizing the thickness and resistivity of loss layer as 0.116 mm and 77 882 times the resistivity of copper, respectively. The accuracy is verified by the single-objective genetic algorithm, which makes the amplifier realize effective restraint of gyrotron backward wave oscillation and achieve the maximum gain.

Double-beam magnetron injection gun

A double-beam magnetron injection gun was used to improve the output power of gyrotrons. A double-beam magnetron injection gun can output two relativistic electron beams, which is a better way to raise the current of the magnetron injection gun without reducing the quality of electron beams. Compared with the double-anode magnetron injection gun with the same output current, the double-beam magnetron injection gun can reduce velocity spread and improve the quality of electron beams, because of its smaller influence of the space charge. Using the software MAGIC, a double-beam magnetron injection gun with a modest velocity ratio and a low velocity spread of electron beams was designed.

Comparison of numerical methods for the problem arising in the gyrotron theory

Abstract There are considered some aspects for numerical solving of problem with Robin's boundary conditions arising in the gyrotron theory. The single mode case is carefully investigated. The obtained observations make possible to offer the suitable strategy for the numerical solving of the problem for general system of nonstationary gyrotron oscillations.

120GHz High Power Gyrotron.

The design of a120GH z, 1MW gyrotron is presented along with its performance experimentally verified.The criteria of selecting the oscillation mode are described as well as the design detail of a resonant cavity and a magnetron injection gun.The gyrotron thus developed is a demountable tube which can be separated into several parts such as a magnetron injection gun, a main body, a collector and a window.All parts are connected with flanges and can be exchanged for other parts having different characteristics.The regions operating in the TE 15, 2, 1 mode and neighboring parasitic modes were determined experimentally.An output power of610kW with an efficiency of30.6%was achieved in the TE 15, 2, 1 mode at 120.3GHz.The mode purity was also measured with a k-spectrometer.

Observation of Frequency Pulling Effect in Gyrotron

Observation of Frequency Pulling Effect in Gyrotron