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Side-effects of the space charge field introduced by a hollow electron beam in the electron cooler of CSRm

Chinese Physics C 2015年第12期39卷 72-77页

作者：汤梅堂杨晓东冒立军李杰马晓明晏太来郑文亨赵贺吴波王耿阮爽沙小平 Institute of Modern Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

An electron cooler is used to improve the quMity of the ion beam in a synchrotron; however it also introduces a nonlinear electromagnetic field to the accelerator, which causes tune shift, tune spread and may drive resonances leading to ion beam loss. In this paper the tune shift and the tune spread caused by the nonlinear electromagnetic field of a hollow electron beam is investigated, and the resonance driving terms of the nonlinear electromagnetic field are analysed. The differences are presented compared with a solid electron beam. Calculations are performed for 23SU32＋ ions of energy 1.272 MeV stored in the main cooler Storage Ring （CSRm） at the Institute of Modern Physics, Lanzhou. It is found that in this situation the nonlinear field caused by the hollow electron beam does not lead to serious resonances.

关键词： electron cooler tune shift tune spread resonance

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Design of an efficient collector for the HIAF electron cooling system

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Nuclear Science and Techniques 2021年第10期32卷 39-49页

作者： Mei-Tang Tang Li-Jun Mao Hai-Jiao Lu Li-Xia Zhao Jie Li Xiao-Ping Sha Fu Ma Yun-Bin Zhou Kai-Min Yan Xiao-Ming Ma Xiao-Dong Yang Jian-Cheng Yang Institute of Modern Physics Chinese Academy of ScienceLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

A collector with high perveance,efficient recu-peration,and low secondary emissions is required for the 450-keV electron cooler in the HIAF accelerator *** optimize the collection efficiency of the collector,a simulation program,based on the Monte Carlo simulations,was developed in the world’s first attempt to calculate the electron collection *** this program,the backscattering electrons and secondary electrons generated on the collector surface are calculated using a Monte Carlo approach,and all electron trajectories in the collector region are tracked by the Runge–Kutta *** this paper,the features and structure of our program are *** backscattering electron yields,with various collector surface materials,are calculated using our ***,the collector efficiencies for various col-lector structures and electromagnetic fields are simulated and *** measurement results of the collection efficiency of the HIAF collector prototype and the CSRm synchrotron are also *** experimental results were in good agreement with the simulation results of our program.

关键词： electron cooler Secondary electron Backscattering electron Monte Carlo method Dielectric function

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Low energy range dielectronic recombination of Fluorine-like Fe^17+at the CSRm

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Chinese Physics C 2018年第6期42卷 53-58页

作者： Nadir Khan 黄忠魁汶伟强 Sultan Mahmood 豆丽君汪书兴许鑫汪寒冰陈重阳啜晓亚朱小龙赵冬梅冒立军李杰殷达钰杨建成原有进朱林繁马新文 Institute of Modern Physics Chinese Academy of SciencesLanznou 730000China University of Chinese Academy of Sciences Beijing 100049China Hefei National Laboratory for Physical Sciences at Micro Scale Department of Modern PhysicsUniversity of Science and Technology of ChinaHefei 230026China Shanghai EBIT Laboratory Key Laboratory of Nuclear Physics and Ion-beam ApplicationInstitute of Modern Physics Department of Nuclear Science and TechnologyFudan UniversityShanghai 200433China

The accuracy of dielectronic recombination （DR） data for astrophysics related ions plays a key role in astrophysical plasma modeling. The absolute DR rate coefficient of Fe^17＋ ions was measured at the main cooler storage ring at the Institute of Modern Physics, Lanzhou, China. The experimental electron-ion collision energy range covers the first Rydberg series up to n = 24 for the DR resonances associated with the 2p1/2 →^2 p3/2△n= 0 core excitations. A theoretical calculation was performed by using FAC code and compared with the measured DR rate coefficient. Overall reasonable agreement was found between the experimental results and calculations. Moreover, the plasma rate coefficient was deduced from the experimental DR rate coefficient and compared with the available results from the literature. At the low energy range, significant discrepancies were found, and the measured resonances challenge state-of-the-art theory at low collision energies.

关键词： storage ring electron cooler electron-ion recombination plasma rate coefficient

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