A5103192935- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Particle accelerators and beam dynamics
- Plasma Diagnostics and Applications
- Gyrotron and Vacuum Electronics Research
- Astronomical Observations and Instrumentation
- GNSS positioning and interference
- Atomic and Subatomic Physics Research
- Advanced Frequency and Time Standards
- Laser-Plasma Interactions and Diagnostics
- Fusion materials and technologies
Czech Academy of Sciences, Institute of Plasma Physics
2013-2024
Czech Technical University in Prague
2019-2022
The article deals with an improvement of the accuracy phase measurements commonly used in microwave diagnostics plasma density. main attention is devoted to development and calibration new detectors (PD) for interferometer operating on tokamak COMPASS IPP Prague. A special paid error measurement. Emphasis put a proper measurement methodology errors correction.
The scale model measurements of the field distribution at various distances from aperture antennas based on oversized quasioptical waveguides are presented. goal is to study their characteristics for introducing radiation into plasma chamber thermonuclear fusion reactors. It was found that such provide necessary parameters microwave beam (diameter and divergence) without use focusing mirrors.
The fast microwave reflectometer system on the COMPASS tokamak consists of an O-mode polarized K-band (18 GHz–26 GHz), Ka-band (26 GHz–40 and a part U-band (40 GHz–54 GHz). plasma density profile from edge area is measured using sweeping rate up to 6 µs probing wave. processing reflected signal realized by heterodyne detection configuration based I/Q modulator. Two different methods dynamic calibration required linear sweep frequency, together with static frequency dispersion calibration,...
Due to an increased interest in runaway electron (RE) phenomena tokamak research, the need for diagnostics of population plasma has emerged. A novel diagnostic nonthermal cyclotron emission from electrons can be utilized this purpose. It was designed and installed at COMPASS based on available heterodyne radiometer. The vertical ECE (V-ECE) system uses a 16-channel radiometer with vertically placed E2-band horn antenna 76.5–90 GHz frequency range front-end. Simulations ray-tracing SPECE code...
This article presents "Compass" TOKAMAK microwave diagnostics calibration and results accuracy enhancing experiment methodology. Main subject is diagnostic system phase measurements description. Additional interest mistakes, attendant to measurement. Emphasis put on detectors mistakes correction methodology; two different meter configurations are described. Phase detectors, based AD8302 CPLD, processing methodology presented.
Runaway electrons, accelerated in a tokamak discharge to high energies (tens of MeV), can cause serious damage plasma facing components. Therefore, it is important develop effective mitigation strategies reduce the risk damage. To study effects various strategies, dedicated diagnostic, calorimetry probe, was developed at COMPASS tokamak. This probe successfully measured heat loads caused by runaway electrons directly, using set temperature sensors embedded graphite body. Deposited energy...
An electron cyclotron emission (ECE) diagnostic of suprathermal electrons was utilised for runaway (RE) experiments purposes in the COMPASS tokamak. Our vertical ECE (V-ECE) system consists a 16-channel heterodyne radiometer and an E-band horn antenna with 76.5-88 GHz frequency range front-end. Simulations used design showed possibility detecting low-energy (50-140 keV) electrons. We realized measurements both extraordinary (X-) ordinary (O-) mode linear polarizations. The amplitudes X-mode...
the concept of unique sub-mm interferometer for tokamak COMPASS-U is developed in Institute Plasma Physics Czech Academy Sciences. The results numerical simulations beam propagation through plasma are presented. Due to that proposed approved as a more suitable solution.