The effective ion charge, Zeff, is a key parameter in magnetic confinement fusion plasma, quantifying the average ionization state of impurities and is critical for assessing plasma impurity level and radial impurity distribution. In ITER tokamak, the expected Zeff is around 1.8, with permissible variations limited to ±0.2. The visible bremsstrahlung measurement is a useful tool for measuring...
Helimak is a plasma experimental device with a helical magnetic field and a toroidal vacuum vessel. The structure of Helimak is similar to that of a tokamak, which make it possible to simulate a tokamak-like in-vessel environment. Low operating costs make it a validation platform for wall conditioning technology of fusion devices.
Microwave reflectometry is a widely used plasma density...
Abstract—A vertical single channel 0.65THz solid-source interferometer (SSI) has been established on Experimental Advanced Superconducting Tokamak (EAST) for real-time electron density measurement and feedback. A novel terahertz line array detection scheme is proposed to improve the spatial resolution of the SSI. By employing high-power solid-state diode sources and an AlGaN/GaN line array...
High spatial resolution edge Thomson scattering diagnostic is important for fusion research. The electron temperature and density profiles of plasma are basic parameters in the study of Tokamak plasma physics, so the development of high spatiotemporal resolution edge Thomson scattering diagnostic has been carried out in many major tokamak devices, such as DIII-D[1], JT-60U[2], JET[3], EAST[4],...
High-Z materials are used as plasma facing components due to excellent material properties in fusion devices. However, impurities are inevitably induced in plasma discharge by plasma-wall interactions. The presence of these impurities can lead to increased energy loss and degradation of plasma confinement. Therefore, the study of impurity behavior based on impurity spectral diagnosis is of...
This paper presents a reconfigurable architecture designed for real-time data processing in tokamak diagnostics. Through the deployment and application on various laser-aided electron density diagnostics, including the HCN interferometer, POINT, solid-state source interferometer, and carbon dioxide dispersion interferometer, the architecture has been validated to meet the real-time data...
