New progress on DC H2+ beam generation: Tens of mA output and 70% fraction from a 2.45 GHz microwave driven ion source

doi:10.1088/1674-1056/adf1ec

Abstract Recently H$_{2}^{+}$ ion beam finds widespread use in many fields, and the demand of high-current H$_{2}^{+}$ ion sources is urgent for numerous applications. However, there are currently almost no reported ion sources capable of generating a direct-current (DC) H$_{2}^{+}$ beam with tens of mA current. In previous work at Peking University (PKU), H$_{2}^{+}$ ion beams with a current of over 40 mA have been obtained in pulse mode, and a current of 16 mA was achieved in DC mode. In this paper, we report the generation of a DC H$_{2}^{+}$ ion beam with a current of 22 mA extracted from an improved miniaturized microwave driven ion source (MMDIS). Beam analysis shows that the H$_{2}^{+}$ fraction in the extracted beam is about 70%. The emittance of the mixed hydrogen beam is about 0.12 $\pi \cdot {\rm mm}\cdot {\rm mrad}$. These results provide references for the applications of H$_{2}^{+}$ beam and the design of H$_{2}^{+}$ ion source.

Keywords: H$_{2}^{+}$ ion beam direct-current (DC) operation 2.45 GHz microwave high current

Received: 14 July 2025
Revised: 18 July 2025
Accepted manuscript online: 19 July 2025

PACS:	52.50.Dg	(Plasma sources)
	52.50.Sw	(Plasma heating by microwaves; ECR, LH, collisional heating)
	52.59.-f	(Intense particle beams and radiation sources)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11975036). We appreciate the support from the State Key Laboratory of Nuclear Physics and Technology at PKU.

Corresponding Authors: Shixiang Peng
E-mail: sxpeng@pku.edu.cn

Cite this article:

Bujian Cui(崔步坚), Shixiang Peng(彭士香), Jianbin Zhu(朱建斌), Yicheng Dong(董宜承), Zhiyu Guo(郭之虞), and Jiaer Chen(陈佳洱) New progress on DC H₂⁺ beam generation: Tens of mA output and 70% fraction from a 2.45 GHz microwave driven ion source 2025 Chin. Phys. B 34 085203

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New progress on DC H2+ beam generation: Tens of mA output and 70% fraction from a 2.45 GHz microwave driven ion source

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New progress on DC H₂⁺ beam generation: Tens of mA output and 70% fraction from a 2.45 GHz microwave driven ion source