研究目的
To develop a high-speed vacuum ultraviolet monochromator for the HL-2A tokamak for direct measurement of impurity density in high temperature plasmas.
研究成果
A high-speed VUV monochromator is developed by using a novel CEM detector on a modified 200 mm focal length Seya-Namioka spectroscopic system. Wavelength calibration is achieved using a hollow cathode light with helium and argon discharges. 60 kHz sample rate is achieved with a good signal to noise ratio in first measurements with the monochromator installed on the HL-2A tokamak.
研究不足
The spectral resolution of the system is not advantageous, and the temporal resolution of most EUV and VUV spectrometers is limited to several milliseconds.
1：Experimental Design and Method Selection:
A high-speed VUV monochromator is developed based on a modified Seya-Namioka spectrometer and a novel type of channel electron multiplier (CEM) employed as the photodetector.
2：Sample Selection and Data Sources:
The wavelength calibration is performed using characteristic line emissions from a hollow cathode light source with helium and argon discharges.
3：List of Experimental Equipment and Materials:
The system includes a 200 mm focal length aberration corrected Seya-Namioka monochromator (McPherson Model 234/302), a Model KBL-210EDR CEM, and a high voltage DC power supply (Stanford Research System, SRS model PS350).
4：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The monochromator is scanned to a wavelength position without line emission, and the signals obtained during the quiescent phase of typical ohmic discharges are chosen as the time series of noise.
5：Data Analysis Methods:
The variance of the sampled voltage data is selected as an estimator for the power of the white noise, and the square of the average of the sampled voltage data is chosen as an estimator for the power of the stray light component.
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