Development and performance test of a high resolution extreme ultraviolet spectroscopy system

Chen Yong; Yang Lei; Lu Feng; Wang Shaoyi; Yang Zuhua; Fan Quanping; Wei Lai

doi:10.11884/HPLPB202638.250393

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Chen Yong, Yang Lei, Lu Feng, et al. Development and performance test of a high resolution extreme ultraviolet spectroscopy system[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250393

Citation:

Chen Yong, Yang Lei, Lu Feng, et al. Development and performance test of a high resolution extreme ultraviolet spectroscopy system[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250393

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Development and performance test of a high resolution extreme ultraviolet spectroscopy system

doi: 10.11884/HPLPB202638.250393

National Key Laboratory of Plasma Physics, Laser Fusion Research Center, CAEP, Mianyang 621900, China

Received Date: 2025-11-03
Accepted Date: 2025-12-08
Rev Recd Date: 2025-12-24

Available Online: 2026-01-07

Abstract

Abstract

Background
The retention and diffusion of helium on the surface of the first wall is one of the key problems in the study of magnetic confinement fusion. And laser-induced breakdown spectroscopy is the most promising technique for in-situ diagnosis of the first wall. Compared with the optical spectral range, laser-induced extreme ultraviolet spectra has more advantages in sensitivity, noise suppression and accuracy.
Purpose
In order to meet the requirement of high precision on-site measurement of helium impurity lines in magnetic confinement fusion, a ultra-high resolution EUV spectroscopy system was developed.
Methods
The grazing incidence Czerny-Turner structure is used in the spectrometer, and the luminous flux and spectral resolution are adjusted through an adjustable incidence slit. The ray tracing simulation is carried out with a self-developed optical design software. And the wavelength calibration and performance testing are carried out by microwave plasma light source.
Results
The simulation results show that the spectral resolution is better than 20 000, and the experimental results indicate that the spectrometer achieves a spectral resolution of 0.001 4 nm at He II (30.3786 nm).
Conclusions
The spectrometer can meet the requirement of high-precision measurement of helium extreme ultraviolet spectral lines, and it is expected to provide an important theoretical support for the research on the helium retention and diffusion in the first wall.
- extreme ultraviolet,
- spectrometer,
- grating,
- spectral resolution,
- laser-induced breakdown spectroscopy

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References(21)

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