| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Surface enhancement of molecular ion H2+ yield in a 2.45-GHz electron-cyclotron resonance ion source |
| Yuan Xu(徐源)1, Shi-Xiang Peng(彭士香)1, Hai-Tao Ren(任海涛)1, Ai-Lin Zhang(张艾霖)1,2, Tao Zhang(张滔)1, Jing-Feng Zhang(张景丰)1, Jia-Mei Wen(温佳美)1, Wen-Bin Wu(武文斌)1, Zhi-Yu Guo(郭之虞)1, Jia-Er Chen(陈佳洱)1,2 |
1 State Key Laboratory of Nuclear Physics and Technology & Institute of Heavy Ion Physics, Peking University, Beijing 100871, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract High current hydrogen molecular ion beam is obtained with a specially designed stainless steel liner permanent magnet 2.45-GHz electron-cyclotron resonance (ECR) ion source (PMECR II) at Peking University (PKU). To further understand the physics of the hydrogen generation process inside a plasma chamber, theoretical and experimental investigations on the liner material of the plasma chamber in different running conditions are carried out. Several kinds of materials, stainless steel (SS), tantalum (Ta), quartz, and aluminum (Al) are selected in our study. Experimental results show that stainless steel and tantalum are much better than others in H2+ generation. During the experiment, an increasing trend in H2+ fraction is observed with stainless steel liner after O2 discharge inside the ion source. Surface analyses show that the roughness change on the surface after O2 discharge may be responsible for this phenomenon. After these studies, the pure current of H2+ ions can reach 42.3 mA with a fraction of 52.9%. More details are presented in this paper.
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Received: 28 February 2017
Revised: 02 May 2017
Accepted manuscript online:
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PACS:
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52.50.Dg
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(Plasma sources)
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52.50.Sw
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(Plasma heating by microwaves; ECR, LH, collisional heating)
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52.40.Hf
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(Plasma-material interactions; boundary layer effects)
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52.59.-f
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(Intense particle beams and radiation sources)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11175009 and 11575013). |
Corresponding Authors:
Shi-Xiang Peng
E-mail: sxpeng@pku.edu.cn
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| About author: 0.1088/1674-1056/26/8/ |
Cite this article:
Yuan Xu(徐源), Shi-Xiang Peng(彭士香), Hai-Tao Ren(任海涛), Ai-Lin Zhang(张艾霖), Tao Zhang(张滔), Jing-Feng Zhang(张景丰), Jia-Mei Wen(温佳美), Wen-Bin Wu(武文斌), Zhi-Yu Guo(郭之虞), Jia-Er Chen(陈佳洱) Surface enhancement of molecular ion H2+ yield in a 2.45-GHz electron-cyclotron resonance ion source 2017 Chin. Phys. B 26 085203
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