A5080545990- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Plasma Diagnostics and Applications
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Laser-Plasma Interactions and Diagnostics
- Atomic and Subatomic Physics Research
- Fusion materials and technologies
- Physics of Superconductivity and Magnetism
- Solar and Space Plasma Dynamics
Southwestern Institute of Physics
2020-2024
Abstract Electron Cyclotron Emission Imaging (ECEI) is a critical diagnostic tool for measuring two-dimensional electron temperature fluctuations. The optical system, key component of the ECEI diagnostic, determines spatial resolution, field view, and imaging performance In this study, comprehensive laboratory tests characterizations including Local Oscillator (LO) coupling optics Radio Frequency (RF) receiving optics, were conducted to ensure optimal during plasma discharge experiments....
Abstract An edge-coherent oscillation (ECO) with a bursting feature was observed in the steep-gradient pedestal region of H-mode plasmas HL-2A tokamak, where type-I edge-localized modes (ELMs) were mitigated by application n = 1 ( is toroidal mode number) resonant magnetic perturbation (RMP). Utilizing newly developed beam emission spectroscopy (BES) system, it found that ECO frequency about 2 kHz located at edge region, and excited three-wave interaction turbulence enhanced RMP field...
Remote control of the diagnostic systems is basic requirement for high performance plasma operation in a fusion device. This work presents development remote system multichannel Doppler backward scattering (DBS) reflectometers. It includes controlled quasi-optical and intermediate frequency (IF) amplifier gain system. The contains rotational polarizer, its polarization angle tunable through motor, it could combine microwave beams with wide range into one focused beam. IF utilizes digital...
A solid state terahertz interferometer has been developed on the recent commissioned HL-2M tokamak. It can work in a wide frequency region of 220–325 GHz, and wave is generated from low phase locked voltage controlled oscillator with multiplying technique. processor based field programmable gate array (FPGA) technology designed for heterodyne interferometer, it contributes to real-time display electron density. To extract information, novel numerical algorithm related fast Fourier transform...
A collective Thomson scattering (CTS) diagnostic system is being developed to measure fastion velocity distribution on HL-3 tokamak. 140 GHz gyrotron belonging electron cyclotron resonance heating (ECRH) would be used generate probe beam. The spectra among parameter ranges are calculated assess feasibility. Scattering signals will detected by a heterodyne system, which proposed optimize performance.
A new quasi-optical (QO) Electron Cyclotron Emission (ECE) transmission system has been established on the HL-3 tokamak, which includes a focusing QO mirror combination and long-distance line. This was developed to meet requirements for poloidal spatial resolution high signal-to-noise ratio needed magnetohydrodynamic (MHD) instability studies using ECE HL-3. The installed inside vacuum chamber focusing. Laboratory test results, theoretical calculations, synthetic simulation results indicate...
To measure plasma density and magnetic fluctuations on the HL-2M tokamak simultaneously, a new diagnostic system combining Doppler backscattering (DBS) cross-polarization scattering (CPS) is under development. It essential to understand propagation of injected scattered rays support electronic/quasi-optical design subsequent interpretation detected signals multi-channel DBS/CPS measurements. Thus, ray-tracing analysis with axisymmetric code BORAY has been performed estimate location...
A 105 GHz collective Thomson scattering (CTS) diagnostic has been successfully developed for fast-ion measurements on the HL-2A tokamak, and it deployed during an experimental campaign. Enhanced signals exhibiting synchronous modulation characteristics have observed across all CTS channels upon launch of a modulated probe wave. Results show that intensity signal increases with Neutral Beam Injection (NBI) power is proportional to neutron count, indicating contains contribution from fast...
Plasma Position Reflectometry (PPR) is planned to provide plasma position and shape information for operation in future fusion reactors. Its primary function calibrate the drift of magnetic signals due integral nature measurement. Here, we attempt measure using ordinary mode (O-mode) extraordinary (X-mode) reflectometry systems on two tokamaks. A new physical model based phase shift proposed deduce relative movement cut-off layer without density inversion. We demonstrate measurements by...