Extinguishment of hot cathode discharges by space-charge and surface magnetic effects
文献类型：期刊论文
| 作者 | Yip, Chi-Shung1; Jin, Chenyao1,2; Zhang, Wei1 ; Xu, Guo Sheng1; Hershkowitz, Noah3; Severn, Greg4
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| 刊名 | PLASMA SOURCES SCIENCE & TECHNOLOGY
 |
| 出版日期 | 2020-11-01 |
| 卷号 | 29 |
| 关键词 | thermionic emission virtual cathode sheaths hot cathode |
| ISSN号 | 0963-0252 |
| DOI | 10.1088/1361-6595/abbdc9 |
| 通讯作者 | Zhang, Wei(zhangwei@ipp.ac.cn) |
| 英文摘要 | Emission characteristics of a directly heated, rod-shaped LaB6 hot cathode has been studied in a multi-dipole confinement device. It is found that contrary to predictions from the conventional space-charge limited emission theory, emission current is not simply limited to a maximum value but eventually extinguished by space-charge related effects. In addition, directional preference of electron emission towards the positive lead of the applied heating voltage can be visibly observed. Results suggest that thermionically emitted electrons trapped in the virtual cathode are pumped towards the high voltage lead of the applied heating, and that the magnetic effects for filament heating currents exceeding 50 A may be the underlying mechanism of extinguishment; that is, the gyromotion of surface emitted electrons for sufficiently great heating currents may prevent electrons from escaping the virtual cathode. Geometrical effects are also briefly discussed. |
| WOS关键词 | EMISSION |
| 资助项目 | CAS Key Research Program of Frontier Sciences[QYZDB-SSW-SLH001] ; National Natural Science Foundation of China[11575248] ; National Natural Science Foundation of China[11505220] ; US National Science Foundation[PHY-1804654] ; US National Science Foundation[PHY-1804240] ; Chinese Academy of Science Hundred Youth Talent Program start-up funding |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000595243400001 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | CAS Key Research Program of Frontier Sciences ; National Natural Science Foundation of China ; US National Science Foundation ; Chinese Academy of Science Hundred Youth Talent Program start-up funding |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/105487]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Zhang, Wei |
| 作者单位 | 1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 2.Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China 3.Univ Wisconsin, Dept Engn Phys, Madison, WI 53706 USA 4.Univ San Diego, Dept Phys & Biophys, San Diego, CA 92110 USA |
| 推荐引用方式 GB/T 7714 | Yip, Chi-Shung,Jin, Chenyao,Zhang, Wei,et al. Extinguishment of hot cathode discharges by space-charge and surface magnetic effects[J]. PLASMA SOURCES SCIENCE & TECHNOLOGY,2020,29. |
| APA | Yip, Chi-Shung,Jin, Chenyao,Zhang, Wei,Xu, Guo Sheng,Hershkowitz, Noah,&Severn, Greg.(2020).Extinguishment of hot cathode discharges by space-charge and surface magnetic effects.PLASMA SOURCES SCIENCE & TECHNOLOGY,29. |
| MLA | Yip, Chi-Shung,et al."Extinguishment of hot cathode discharges by space-charge and surface magnetic effects".PLASMA SOURCES SCIENCE & TECHNOLOGY 29(2020). |
入库方式： OAI收割
来源：合肥物质科学研究院
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