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中国物理学会期刊

近玻尔速度能区高电荷态离子与激光等离子体相互作用实验研究装置

CSTR: 32037.14.aps.72.20230214

Experimental setup for interaction between highly charged ions and laser-produced plasma near Bohr velocity energy region

CSTR: 32037.14.aps.72.20230214
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  • 近玻尔速度能区高电荷态离子在稠密等离子体中的能量损失是强流重离子束驱动的高能量密度物理等前沿研究中的核心物理问题之一. 基于中国科学院近代物理研究所的320 kV实验平台, 新建立了一套近玻尔速度能区离子束与激光等离子体相互作用的实验研究装置, 用于开展高精度的离子能量损失和电荷态研究. 本文将详细介绍该装置的特点, 包括脉冲离子束(≥ 200 ns)的产生与调控、高密度(1017—1021 cm–3)激光等离子体靶的制备、等离子体参数诊断与离子的高精度测量(< 1%)等. 基于该装置已开展了百keV的质子束和4 MeV的 Xe15+离子束与激光Al等离子体靶相互作用的实验, 并取得了相应的结果. 本实验装置能够为中国在近玻尔速度能区高电荷离子与稠密激光等离子体相互作用研究提供高精度的实验数据, 以促进理论工作的发展.

     

    Ion energy loss in the interaction between highly charged ions and dense plasma near Bohr velocity energy region is one of the important physical problems in the field of high-energy density physics driven by intense heavy ion beams. Based on the 320 kV experimental platform at the Institute of Modern Physics, Chinese Academy of Sciences, a new experimental setup was built for the research of interaction between ions and laser-produced plasma near the Bohr velocity, where the ion energy loss and charge state distribution can be experimentally investigated. In this paper we introduce the new setup in detail, including the generation and controlling of pulsed ion beam ( ≥ 200 ns); the preparation of high-density laser plasma target (1017—1021 cm–3); the diagnostics of plasma and the developed high energy resolution ion measurement system (< 1%). In the experiment, the charge distribution of Xe15+ ions with 4 MeV penetrating through the laser-produced Al plasma target is measured. The charge-state analysis device observes different results without and with the plasma, in which the outgoing Xe ion charge-state changes correspondingly from the 15+ to 10+, thus the electron capture process is believed to be dominant. In addition, the proton energy loss is also measured by using the magnetic spectrometer, showing that the experimental energy loss is about 2.0 keV, 30% higher than those theoretical predictions , which can be attributed to the fact that in the near Bohr velocity energy regime, the first-order Born approximation condition is not valid, thus the Bethe model and SSM model are inapplicable to the experimental results. In future, a systematic study will be performed based on our ions-plasma ineteraction setup, and the energy loss and charge state data will be introduced.

     

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