HUANG Houke; WEN Weiqiang; HUANG Zhongkui; WANG Shuxing; TANG Meitang; LI Jie; MAO Lijun; YUAN Yang; WAN Mengyu; LIU Chang; WANG Hanbing; ZHOU Xiaopeng; ZHAO Dongmei; YAN Kaiming; ZHOU Yunbin; YUAN Youjin; YANG Jiancheng; ZHANG Shaofeng; ZHU Linfan; MA Xinwen

doi:10.7498/aps.74.20241589

Abstract

Dielectronic recombination (DR) experiments of highly charged ions not only provide essential atomic benchmark data for astrophysical and fusion plasma research but also serve as a stringent test for strong-field quantum electrodynamics (QED) effects, relativistic effects, and electron correlation effects. High-intensity heavy-ion accelerator facility (HIAF), currently under construction at Huizhou, China, will have a high-precision spectrometer ring (SRing) equipped with a 450 kV electron-cooler and an 80 kV ultracold electron-target. This advanced setup facilitates precise measurements of the DR process for highly charged ions in a broad range of center-of-mass energy, from meV to tens of keV. In this work, we carry out the molecular dynamics simulation of the electron beam temperature distribution of the ultracold electron-target at the SRing. The simulation results indicate that after treatment by the designed adiabatic magnetic field and acceleration field, the transverse and longitudinal electron beam temperature generated by the thermionic electron gun can be reduced from 100 meV to below 5 meV and 0.1 meV, respectively. Furthermore, we analyze the influence of this ultracold electron beam temperature on the resonance peak and energy resolution in DR experiment. The resolution gain at the SRing electron-target is particularly pronounced at small electron-ion collision energy, which provides unique experimental conditions for the DR experiments. Taking lithium-like $ {}_{~\,54}^{129}{{\mathrm{X}}{\mathrm{e}}}^{51+} $ and $ {}_{~\,92}^{238}{{\mathrm{U}}}^{89+} $ ions for example, we simulate the DR resonance spectra at the SRing and compare them with the simulated results from the experimental cooler storage ring CSRe. The results reveal that the SRing experiments can resolve fine DR resonance structures with ultra-high energy resolution compared with those from the CSRe. This work lays a solid foundation for precise DR spectroscopy of highly charged ions at the SRing to stringent test of strong field QED effect and extraction nuclear structure information.

Keywords:

highly charged ions /
storage ring /
dielectronic recombination /
ultracold electron-target /
strong-field quantum electrodynamics effect

Authors and contacts

Corresponding author: WEN Weiqiang, wenweiqiang@impcas.ac.cn ; MA Xinwen, x.ma@impcas.ac.cn

Funds: Project supported by the National Key R&D Program of China (Grant No. 2022YFA1602500), the National Natural Science Foundation of China (Grant No. 12393824), and the Youth Innovation Promotion Association of the Chinese Academy of Science.

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Cited By

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物理量	参数
阴极半径/mm	4
电子束能量/keV	10—80
相互作用区电子束密度/(10⁶ cm^–3)	2
电子束最大流强/A	0.2
电子枪区最大磁场强度/T	1.2
相互作用段最大磁场强度/T	0.04
最大绝热参数	0.2
最大绝热展开因子	30
最大加速电场/(kV·cm^–1)	2.3

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Vol. 74, Issue 4 - 2025-02-20

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