| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Diagnosis of electron temperature of copper foil plasmas produced at the Shenguang-II facility |
| Chenglong Zhang(张成龙)1,2, Haochen Gu(谷昊琛)2,3, Yu Dai(戴羽)2,3, Ke Fang(方可)2, Yufeng Dong(董玉峰)2,3, Peng Zhou(周鹏)4,5, and Yingjun Li(李英骏)1,† |
1 State Key Laboratory for Tunnel Engineering, China University of Mining and Technology, Beijing 100083, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
4 Key Laboratory for Laser Plasmas (MoE) and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China;
5 Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China |
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Abstract Warm dense plasmas are crucial for high-energy-density physics and inertial confinement fusion research. Experiments involving laser-irradiated copper (Cu) foil were performed at the Shenguang-II facility. A highly oriented pyrolytic graphite crystal spectrometer measured the time-integrated spectral distribution of Cu under varying laser intensities. Using the two-dimensional radiation-hydrodynamics code FLASH and the spectral analysis code FLYCHK, we simulated the temporal evolution of plasma density and temperature distributions, as well as the emission intensities of spectral lines at different temperatures and densities. The simulation results revealed that the two-electron satellite lines ($J$) and the resonance line ($W$) emissions of Cu originate predominantly from the radiation region near the critical density surface, with a density range from approximately 0.5$ n_{\rm c}$ to 1.0$ n_{\rm c}$, and radiate primarily during the laser irradiation period. By analyzing the $J/W$ intensity ratio of the measured spectral lines, we estimated the electron temperatures near the critical-density surface under different laser intensities.
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Received: 10 February 2025
Revised: 28 March 2025
Accepted manuscript online: 08 April 2025
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PACS:
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52.57.-z
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(Laser inertial confinement)
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52.57.Kk
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(Fast ignition of compressed fusion fuels)
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| Fund: Project supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos. XDA25051000, XDA25010100, XDA25010300, XDA25030100, and XDA25030200). |
Corresponding Authors:
Yingjun Li
E-mail: lyj@aphy.iphy.ac.cn
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Cite this article:
Chenglong Zhang(张成龙), Haochen Gu(谷昊琛), Yu Dai(戴羽), Ke Fang(方可), Yufeng Dong(董玉峰), Peng Zhou(周鹏), and Yingjun Li(李英骏) Diagnosis of electron temperature of copper foil plasmas produced at the Shenguang-II facility 2025 Chin. Phys. B 34 075202
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