S. S. Ponomarenko

Waveguide output for 130 GHz CW Clinotron

The numerical simulation of waveguide output of CW Clinotron is proposed. Also the results of trajectory analysis are presented in order to compare the results in the case of optimized and non optimized geometries. To consider the power dissipation at the shielding rods the simulation results of thermal distribution along the rods are presented.

Frequency-tunable gyrotron with two mirror cavity

The simulation results of the pulsed magnetic system, electromagnetic system and electro-optical system of confocal gyrotron are presented in the paper. Besides the radio frequency energy output and dependence of its efficiency on operating frequency has been presented and discussed.

High-voltage power supply with optimal chatacteristics for sub-THz clinotrons

The results of R&D work dedicated to the development of high-voltage power supply unit that will provide high-stable operation of sub-THz CW clinotron system have been presented and discussed in this paper. High-voltage power supply provides the output voltage instability of 10-6 in order to achieve the stability of the clinotron operation frequency better than 10-5 that is required for the system application in DNP NMR spectroscopy and etc. For the system output power stabilization it is proposed to use the PID control scheme in the electron gun filament circuit. The PID control is proposed to realize in widely used codes such as NI LabVIEW and the scheme for application of such stabilization using proposed high-voltage power supply unit is discussed in the paper.

Sub-THz CW clinotrons with multi-stage gratings

The development of sub-THz CW clinotrons with improved operational parameters is discussed in this paper. The application of multistage gratings is proposed as a way of the high-frequency losses reduction at the sub-THz range and enhancement of the beam-particle interaction efficiency. Three-, four- and five- stage gratings are considered and compared to uniform one. The dispersion analysis of the proposed slow-wave structures is carried out. Numerical simulation of self modes of the cavity resonator with multistage grating was performed.