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高电荷态重离子的双电子复合精密谱实验不仅能够为天体物理、聚变等离子体物理等研究提供诊断和建模的关键原子物理数据, 还可以用于检验强电磁场条件下的量子电动力学(QED)效应、相对论效应以及电子关联效应等基本物理模型. 我国正在建设的“十二五”大科学装置强流重离子加速器(HIAF), 其中高精度环形谱仪(SRing)装备有450 kV电子冷却器和80 kV超冷电子靶装置, 能够在宽质心能量范围(从meV到几十keV)内对高电荷重离子开展双电子复合谱精密测量. 本文首先采用分子动力学方法模拟了SRing上超冷电子靶的电子束温度分布, 结果表明, 热阴极产生的电子束经过磁场的绝热膨胀和电场加速后, 电子束的横向温度从100 meV降至5 meV以下, 而纵向温度则能从100 meV降至0.1 meV以下, 这为开展高分辨和高精度的双电子复合实验提供了独一无二的实验条件. 接着分析了SRing上超冷电子靶的电子束温度对双电子复合实验中共振峰能量分辨的影响, 以类锂$ {}_{54}^{129}{{\mathrm{X}}{\mathrm{e}}}^{51+} $和$ {}_{92}^{238}{{\mathrm{U}}}^{89+} $重离子为例, 模拟了SRing上的双电子复合共振谱, 并与兰州重离子储存环CSRe上的模拟结果进行了比较. 结果表明, 基于SRing超冷电子靶的双电子复合精密谱学实验在质心系能量较低的时候具有极高的能量分辨, 能够测量更为精细的双电子复合共振结构. 本研究为SRing上开展高电荷态重离子双电子复合谱精密测量检验强场QED效应和提取原子核结构信息等前沿实验奠定了坚实的基础.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 conducting cutting-edge experiments such as precise measurement and verification of strong field QED effect and extraction of atomic nucleus structure information using highly charged state heavy ion double electron composite spectra on SRing .
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Keywords:
- highly charged ions /
- storage ring /
- dielectronic recombination /
- ultracold electron-target /
- strong-field quantum electrodynamics effect
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图 1 类锂离子的双电子复合过程示意图 (a)→(b)电子共振俘获过程; (b)→(c)辐射稳定过程; (d)双电子复合共振谱示意图
Fig. 1. DR process for Li-like ions: (a)→(b) the resonant electron capture process; (b)→(c) the radiative stabilization process; (d) schematic diagram of measurement for DR spectrum.
图 4 (a)超冷电子靶装置设计的绝热磁场 $ {B}_{z} $和绝热参数$ \xi $的分布图; (b)超冷电子靶的电子束从热阴极发射后, 通过绝热磁场膨胀的示意图. 在引导磁场的作用下, 电子进行拉莫尔进动并经历绝热膨胀. 绿色箭头表示电子的运动轨迹
Fig. 4. (a) Designed adiabatic magnetic field $ {B}_{z} $ and adiabatic parameter $ \xi $ of ultracold electron-target as a function of position in the electron-target; (b) schematic illustration of an electron beam emitted from a thermionic cathode within an ultracold electron-target as it traverses the magnetic field. Under the influence of the guiding magnetic field, the electrons undergo Larmor precession and adiabatic expansion. The green arrows indicate the direction of electron motion.
图 5 (a) 单个电子横向动能、电子束横向温度随着电子束能量的变换关系. 黑色点线表示单个电子的横向动能, 红色曲线代表电子束的横向温度. 当电子束的能量低于80 keV时, 电子束在磁场中保持绝热运动状态. (b) 电子束纵向温度随着电子束能量的变换关系
Fig. 5. (a) Transverse kinetic energy of the individual electron and transverse temperature of the electron beam as a function of electron beam energy. The black dashed line indicates the transverse kinetic energy of individual electrons, while the red curve represents the transverse temperature of the electron beam. The electron beam maintains adiabatic motion within the magnetic field when the energy of the electron beam is below 80 keV. (b) The longitudinal temperature of the electron beam as a function of electron beam energy.
图 6 SRing(红色的实线)和CSRe(蓝色的实线)上双电子复合实验的能量分辨率与电子-离子碰撞能量之间的关系. 图中分别标出了横向温度(kT⊥)、纵向温度(kT//)对实验分辨的贡献. SRing在低能电子离子碰撞区域(meV级)展现出极高的能量分辨
Fig. 6. Energy resolution of DR experiments as a function of electron-ion collision energy at the storage SRing (red solid line) and CSRe (blue solid line). The figure also shows the contributions of transverse temperature (kT⊥) and longitudinal temperature (kT//) to the experimental resolution. The DR experiment demonstrates ultra-high energy resolution in the low-energy electron-ion collision region (meV-level).
图 7 (a)电子束纵向温度$ {{k}_{{\mathrm{B}}}T}_{// }=0.1\;{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}} $不变, 不同的电子束横向温度$ {k}_{{\mathrm{B}}}{T}_{\perp }=5, {\mathrm{ }}10, {\mathrm{ }}20\;{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}} $对双电子复合峰型和速率系数的影响, 其中共振峰的能量$ {E}_{{\mathrm{d}}}=20\;{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}} $. (b)电子束横向温度$ {k}_{{\mathrm{B}}}{T}_{\perp }=5\;{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}} $不变, 不同的电子束纵向温度$ {{k}_{{\mathrm{B}}}T}_{// }=0.1, $$ {\mathrm{ }}{\mathrm{ }}{\mathrm{ }}{\mathrm{ }}0.5, {\mathrm{ }}1{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}} $对双电子复合峰型和速率系数的影响, 其中共振能量$ {E}_{{\mathrm{r}}{\mathrm{e}}{\mathrm{s}}}=20\;{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}} $. (c) SRing和CSR在同样的共振位置上的共振峰, 其中SRing上的电子束温度为$ {k}_{{\mathrm{B}}}{T}_{\perp }=5\;{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}}, {{k}_{{\mathrm{B}}}T}_{// }=0.1\;{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}} $, 而CSRe上的电子束温度为$ {k}_{{\mathrm{B}}}{T}_{\perp }=80\;{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}}, {{k}_{{\mathrm{B}}}T}_{// }=1{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}} $
Fig. 7. (a) Effect of different transverse temperatures of the electron beam, $ {k}_{{\mathrm{B}}}{T}_{\perp }=5, {\mathrm{ }}10, {\mathrm{ }}20\;{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}} $, on the DR peak shape and rate coefficient when the longitudinal temperature $ {{k}_{{\mathrm{B}}}T}_{// }=0.1\;{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}} $ is constant, with the resonance energy $ {E}_{{\mathrm{d}}}=20\;{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}} $. (b) Effect of different longitudinal temperatures of the electron beam, $ {{k}_{{\mathrm{B}}}T}_{// }=0.1, {\mathrm{ }}{\mathrm{ }}{\mathrm{ }}{\mathrm{ }}0.5, {\mathrm{ }}1{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}} $, on the DR peak shape and rate coefficient when the transverse temperature $ {k}_{{\mathrm{B}}}{T}_{\perp }=5\;{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}} $ is constant, with the resonance energy $ {E}_{{\mathrm{d}}}=20\;{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}} $. (c) Simulation peaks of SRing and CSRe at the same resonance energy, the temperatures used for SRing and CSRe are $ {k}_{{\mathrm{B}}}{T}_{\perp }=5\;{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}}, {{k}_{{\mathrm{B}}}T}_{// }=0.1\;{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}} $ and $ {k}_{{\mathrm{B}}}{T}_{\perp }=80\;{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}}, {{k}_{{\mathrm{B}}}T}_{// }=1{\mathrm{ }}{\mathrm{m}}{\mathrm{e}}{\mathrm{V}} $, respectively.
图 8 双电子复合实验模拟谱 (a)类锂$ {}_{54}^{129}{{\mathrm{X}}{\mathrm{e}}}^{51+} $离子; (b) 类锂$ {}_{92}^{238}{{\mathrm{U}}}^{89+} $离子. 图中红色实线代表SRing的模拟结果, 蓝色实线代表CSRe的模拟结果, 而黑色竖线表示由FAC程序计算得出的双电子复合共振位置和强度
Fig. 8. DR experimental simulation spectra: (a) Li-like $ {}_{54}^{129}{{\mathrm{X}}{\mathrm{e}}}^{51+} $ ions; (b) Li-like $ {}_{92}^{238}{{\mathrm{U}}}^{89+} $ ions. The red solid line represents the simulation results at SRing, the black solid line represents the simulation results at CSRe, and the black vertical lines represent the positions and strengths of DR resonances calculated by the FAC code.
图 9 (a) 类锂离子$ {2{\mathrm{s}}}_{1/2}-{2{\mathrm{p}}}_{1/2} $能级跃迁中的各种效应贡献及相关实验测量结果. 使用SRing电子靶可以在高精度下测量类锂238U89+离子的$ {2{\mathrm{s}}}_{1/2}-{2{\mathrm{p}}}_{1/2} $跃迁能, 从而为严格检验强场下的高阶QED效应提供可能. (b) 类锂 238, 234U89+同位素离子对应的双电子复合谱
Fig. 9. (a) Contributions of various effects to the transition energy of $ {2{\mathrm{s}}}_{1/2}-{2{\mathrm{p}}}_{1/2} $ and the results of current experimental measurements. By utilizing the electron-target of SRing, we can measure the $ {2{\mathrm{s}}}_{1/2}-{2{\mathrm{p}}}_{1/2} $ transition energy in 238U89+ ions with high-precision, which provides an opportunity for a stringent test of higher-order QED effects in strong-field. (b) DR spectrum for lithium-like 238, 234U89+ isotopes.
表 1 超冷电子靶的主要物理设计参数
Table 1. Main physical design parameters of the ultracold electron-target.
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) 1.8 
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