Optical design of the Lyman alpha based beam emission spectroscopy (LAB) diagnostic on the HL-2A
tokamak
【Abstract】
In this article, we present the optical design of a novel diagnostic on the HL-2A tokamak, i.e. the
20-channel edge Lyman-alpha beam emission spectroscopy, which is a promising solution for edge
density turbulence research on tokamaks, as it offers the possibility of density fluctuation
measurement with a 3.3 mm spatial resolution while maintains a high temporal resolution of 1 μ s.
The optical path, including the reflective collection optics, the high-dispersion spectrometer, and
the linear detector array, is carefully optimized to obtain a good image quality and a high
throughput. The maximum root mean square radius of the collection optics is 64 μ m. The detected
photon flux is estimated to be about 10 11 photons/s/channel.
【Author】
Yixuan ZHOU, Huajie WANG, Yi YU, Yihang CHEN, Rui KE, Min XU, Chijie XIAO, Zhanhui WANG, Jiquan LI, Xuru DUAN and Minyou YE
【Journal】
Plasma Science and Technology(IF：1) Time：2021-06-19
