A low-energy compact Shanghai-Wuhan electron beam ion trap for extraction of highly charged ions

Shiyong Liang; Qifeng Lu; Xincheng Wang; Yang Yang; Ke Yao; Yang Shen; Baoren Wei; Jun Xiao; Shaolong Chen; Pengpeng Zhou; Wei Sun; Yonghui Zhang; Yao Huang; Hua Guan; Xin Tong; Chengbin Li; Yaming Zou; Tingyun Shi; Kelin Gao

doi:10.1063/1.5112154

A low-energy compact Shanghai-Wuhan electron beam ion trap for extraction of highly charged ions

Rev Sci Instrum. 2019 Sep;90(9):093301. doi: 10.1063/1.5112154.

Authors

Shiyong Liang¹, Qifeng Lu², Xincheng Wang³, Yang Yang², Ke Yao², Yang Shen², Baoren Wei², Jun Xiao², Shaolong Chen¹, Pengpeng Zhou¹, Wei Sun¹, Yonghui Zhang¹, Yao Huang¹, Hua Guan¹, Xin Tong¹, Chengbin Li¹, Yaming Zou², Tingyun Shi¹, Kelin Gao¹

Affiliations

¹ State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China.
² Institute of Modern Physics, Department of Nuclear Science and Technology, Fudan University, Shanghai 200433, China.
³ School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.

PMID: 31575235
DOI: 10.1063/1.5112154

Abstract

A low-energy, compact, and superconducting electron beam ion trap (the Shanghai-Wuhan EBIT or SW-EBIT) for extraction of highly charged ions is presented. The magnetic field in the central drift tube of the SW-EBIT is approximately 0.21 T produced by a pair of high-temperature superconducting coils. The electron-beam energy of the SW-EBIT is in the range of 30-4000 eV, and the maximum electron-beam current is up to 9 mA. Acting as a source of highly charged ions, the ion-beam optics for extraction is integrated, including an ion extractor and an einzel lens. A Wien filter is then used to measure the charge-state distribution of the extracted ions. In this work, the tungsten ions below the charge state of 15 have been produced, extracted, and analyzed. The charge-state distributions and spectra in the range of 530-580 nm of tungsten ions have been measured simultaneously with the electron-beam energy of 279 eV and 300 eV, which preliminarily indicates that the 549.9 nm line comes from W¹⁴⁺.