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Broadband time-resolved elliptical crystal spectrometer for X-ray spectroscopic measurements in laser-produced plasmas |
Wang Rui-Rong (王瑞荣), Jia Guo (贾果), Fang Zhi-Heng (方智恒), Wang Wei (王伟), Meng Xiang-Fu (孟祥富), Xie Zhi-Yong (谢志勇), Zhang Fan (张帆) |
Shanghai Institute of Laser Plasma, Shanghai 201800, China |
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Abstract The X-ray spectrometer used in high-energy-density plasma experiments generally requires both broad X-ray energy coverage and high temporal, spatial, and spectral resolutions for overcoming the difficulties imposed by the X-ray background, debris, and mechanical shocks. By using an elliptical crystal together with a streak camera, we resolve this issue at the SG-II laser facility. The carefully designed elliptical crystal has a broad spectral coverage with high resolution, strong rejection of the diffuse and/or fluorescent background radiation, and negligible source broadening for extended sources. The spectra that are Bragg reflected (23°<θ<38°) from the crystal are focused onto a streak camera slit 18 mm long and about 80 μm wide, to obtain a time-resolved spectrum. With experimental measurements, we demonstrate that the quartz(1011) elliptical analyzer at the SG-II laser facility has a single-shot spectral range of (4.64-6.45) keV, a typical spectral resolution of E/ΔE=560, and an enhanced focusing power in the spectral dimension. For titanium (Ti) data, the lines of interest show a distribution as a function of time and the temporal variations of the He-α and Li-like Ti satellite lines and their spatial profiles show intensity peak red shifts. The spectrometer sensitivity is illustrated with a temporal resolution of better than 25 ps, which satisfies the near-term requirements of high-energy-density physics experiments.
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Received: 15 January 2014
Revised: 16 April 2014
Accepted manuscript online:
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PACS:
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32.30.Rj
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(X-ray spectra)
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32.70.Jz
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(Line shapes, widths, and shifts)
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31.70.Hq
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(Time-dependent phenomena: excitation and relaxation processes, and reaction rates)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11175167). |
Corresponding Authors:
Wang Rui-Rong
E-mail: wangrr59@sina.com
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Cite this article:
Wang Rui-Rong (王瑞荣), Jia Guo (贾果), Fang Zhi-Heng (方智恒), Wang Wei (王伟), Meng Xiang-Fu (孟祥富), Xie Zhi-Yong (谢志勇), Zhang Fan (张帆) Broadband time-resolved elliptical crystal spectrometer for X-ray spectroscopic measurements in laser-produced plasmas 2014 Chin. Phys. B 23 113201
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