A dual-route optical emission spectroscopy diagnostic with wide spectral range and high wavelength resolution on HL-2A tokamak

【摘要】 A dual-route optical emission spectroscopy（D-OES） diagnostic is newly developed to monitor the optical emission from the X-point plasma region on the HL-2 A tokamak.This diagnostic is composed of an imaging system,a beam-splitting system for dual-route measurements,fiber bundles,a spectrometer system,and a control and acquisition system.One route is used to obtain wide-spectral-range spectra,and the other route is used to acquire high-wavelengthresolution line shapes.The spectral resolution of the wide-range spectrometers is 0.8 nm with a coverage of 800 nm（@200-1000 nm）.The spectral resolution of the high-resolution spectrometer is 0.01 nm with a coverage of 6 nm（@200-660 nm）.The spatial resolution of each route of D-OES is about 4 cm with 11 channels.The temporal resolution is 16 ms at maximum in the single-channel mode.Wide-range spectra（containing Balmer series and a Fulcher band）and highly resolved Ha line shapes are obtained by D-OES in the hydrogen glow discharge in the lab.D-OES measurements are carried out in the high-density deuterium experiments of HL-2A.The electron density n_e and deuterium temperature TD in the X-point multifaceted asymmetric radiation from the edge（MARFE） region are derived simultaneously by fitting the measured Da shape.The density n_e is observed to increase from ～8.7×10¹⁸ m^-3 to～7.8 × 10¹⁹ m^-3,and the temperature T_D drops from ～14.4 eV to ～2.3 eV after the onset of MARFE in the discharge#38260.更多还原

【Abstract】 A dual-route optical emission spectroscopy（D-OES） diagnostic is newly developed to monitor the optical emission from the X-point plasma region on the HL-2 A tokamak.This diagnostic is composed of an imaging system,a beam-splitting system for dual-route measurements,fiber bundles,a spectrometer system,and a control and acquisition system.One route is used to obtain wide-spectral-range spectra,and the other route is used to acquire high-wavelengthresolution line shapes.The spectral resolution of the wide-range spectrometers is 0.8 nm with a coverage of 800 nm（@200-1000 nm）.The spectral resolution of the high-resolution spectrometer is 0.01 nm with a coverage of 6 nm（@200-660 nm）.The spatial resolution of each route of D-OES is about 4 cm with 11 channels.The temporal resolution is 16 ms at maximum in the single-channel mode.Wide-range spectra（containing Balmer series and a Fulcher band）and highly resolved Ha line shapes are obtained by D-OES in the hydrogen glow discharge in the lab.D-OES measurements are carried out in the high-density deuterium experiments of HL-2A.The electron density n_e and deuterium temperature TD in the X-point multifaceted asymmetric radiation from the edge（MARFE） region are derived simultaneously by fitting the measured Da shape.The density n_e is observed to increase from ～8.7×10¹⁸ m^-3 to～7.8 × 10¹⁹ m^-3,and the temperature T_D drops from ～14.4 eV to ～2.3 eV after the onset of MARFE in the discharge#38260.更多还原