Speaker
Description
The Fourier-Transform Spectrometers (FTS) planned for ITER measure broadband Electron Cyclotron Emission (ECE) for plasma temperature profile estimation.
The diagnostic principle requires it to be absolutely calibrated so that the intensity of the emission is derivable from the measurement at every frequency in the specified spectral range of 70–1000 GHz.
This work finds an approximation of the sensitivity (the factor between the emission intensity and the measurement voltage) as a function of frequency for the diagnostic and front-end components as a whole—including analysis of parts in the quasioptical antenna, the transmission waveguide, and measurements of a prototype backend system.
This sensitivity is then compared with expected electrical noise levels to estimate the integration time needed for calibration to achieve the level of precision required of the diagnostic design.
The synthetic diagnostic resulting from the sensitivity estimation may also be further expanded and useful for development of data analysis and/or control systems.
