Speaker
Description
The beam emission spectrometer that shares the same collection optics with the existing core charge exchange recombination spectroscopy (cCXRS) on EAST has recently been upgraded. The enhanced system allows the simultaneous measurements of red- and blue-shifted parts of the Doppler spectrum as well as the active charge exchange line (Dα n = 3-2 656.1nm) from the main ions. One curved strip on the glass made by the method of optical mask is used to attenuate the cold Dα emission line. The operating spectral bands of the system is 656.1±6nm, considering the Doppler shift induced by the maximum angle between the line of sight and neutral beam injection (NBI) as well as the maximum injection energy of 80 keV for deuterium beam. The enhanced system aims at the simultaneous measurements of the neutral beam emission from the Co-current and Counter-current NBI as well as the active charge exchange line (Dα n = 3-2 656.1nm) from the main ions. In this paper, an overview of the upgraded spectrometer will be shown and the first experimental results are presented.
