Speaker
Description
Blackbody In-Situ Calibration is the standard calibration method for Electron Cyclotron Emission (ECE) diagnostics, but it poses risks of performance degradation or even failure under future deuterium-tritium (DT) environments. To offer more ECE calibration methods, the Magnetic Difference Calibration Method (MDM) was developed on the HL-3 Tokamak, which reduces the risk of failure. Based on the electron temperature (T_e) provided by the METIS (Minute Embedded Tokamak Integrated Simulator) code and considering the plasma horizontal and vertical displacement control capabilities on HL-3, an optimization method for MDM was proposed. The ECE calibration results indicate a high reliability, with approximately 98% accuracy on the low-field side (LFS). Additionally, a method for analyzing MDM calibration errors was proposed. By utilizing optimized MDM data, the MDM calibration error for real plasma was demonstrated. This error consists of both MDM errors and fitting errors, with typical values below 2% and 3%, respectively, leading to a total MDM calibration error of less than 4%. Compared to the blackbody in-situ calibration, the sources of MDM calibration errors are simpler and more quantifiable.
