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Practical 2.45-GHz microwave-driven Cs-free Hˉ ion source developed at Peking University

Chinese Physics B 2018年第10期27卷 477-483页

作者： Tao Zhang Shi-Xiang Peng Wen-Bin Wu Hai-Tao Ren Jing-Feng Zhang Jia-Mei Wen Teng-Hao Ma Yao-Xiang Jiang Jiang Sun Zhi-Yu Guo Jia-Er Chen SKLNPT ＆ IHIE School of Physics Peking UniversityBeijing 100871China

A practical 2.45-GHz microwave-driven Cs-free H^- source was improved based on the experimental H^- source at Peking University（PKU）. Several structural improvements were implemented to meet the practical requirements of Xi＇an Proton application Facility（XiPaf）. Firstly, the plasma chamber size was optimized to enhance the plasma intensity and stability. Secondly, the filter magnetic field and electron deflecting magnetic field were enhanced to reduce co-extracted electrons. Thirdly, a new two-electrode extraction system with farther electrode gap and enhanced water cooling ability to diminish spark and sputter during beam extraction was applied. At last, the direct H^- current measuring method was adopted by the arrangement of a new pair of bending magnets before Faraday cup（FC） to remove residual electrons. With these improvements, electron cyclotron resonance（ECR） magnetic field optimization experiments and operation parameter variation experiments were carried out on the H^- ion source and a maximum 8.5-mA pure H^- beam was extracted at 50 kV with the time structure of 100 Hz/0.3 ms. The root-mean-square（RMS） emittance of the beam is 0.25 Π·mm·mrad. This improved H^- source and extraction system were maintenance-free for more than 200 hours in operation.

关键词： electron cyclotron resonance (ECR) ion source hydrogen plasma negative ion beam plasma application

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Segmented pulsed discharge for metastable argon lasing medium

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Chinese Optics Letters 2022年第3期20卷 66-71页

作者： Zhifan Zhang Peng Lei Duluo Zuo Xinbing Wang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 43007AChina

Direct current pulsed discharge is a promising route for producing high-density metastable particles required for optically pumped rare gas lasers(OPRGLs).Such metastable densities are easily realized in small discharge volumes at near atmospheric pressures,but problems appear when one is trying to achieve a large volume of plasma for high-power *** this work,we examined the volume scalability of high-density metastable argon atoms by segmented discharge *** discharge zones attached with peaking capacitors were connected parallelly by thin wires,through which the peaking capacitors were charged and of which the inductance functioned as ballasting impendence to prevent discharging in only one zone.A uniform and dense plasma with the peak value of the number densities of Ar(1s^(5))on the order of 10^(13)cm^(-3)was readily *** results demonstrated the feasibility of using segmented discharge for 0PRGL development.

关键词： rare gas laser pulsed discharge plasma application

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