Propagation of individual plasma spots on cathode surface by high-current discharge process
In this Letter, plasma distribution on a carbon-fiber–aluminum (CFA) cathode powered by a ∼450 kV, ∼350 ns, ∼ 50 Ω HV pulse generator is investigated by time-and-space-resolved electrical and optical diagnostics. A quasi stationary behavior of cathode plasma expansion into the vacuum gap was observe...
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Published in | Physics letters. A Vol. 373; no. 12; pp. 1165 - 1169 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
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Elsevier B.V
16.03.2009
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Abstract | In this Letter, plasma distribution on a carbon-fiber–aluminum (CFA) cathode powered by a ∼450 kV, ∼350 ns,
∼
50
Ω
HV
pulse generator is investigated by time-and-space-resolved electrical and optical diagnostics. A quasi stationary behavior of cathode plasma expansion into the vacuum gap was observed during the main pulse. The cathode plasma distribution is characterized by individual plasma spots. It was shown by optical and X-ray measurements that the uniformity of the extracted electron beam is satisfactory in spite of the individual plasma spots. A mechanism for this phenomenon is suggested. Relativistic electron beams, with the current densities up to 340 A/cm
2, were obtained. This class of CFA cathode may offer the promising prospect of high-current electron beam sources. |
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AbstractList | In this Letter, plasma distribution on a carbon-fiber–aluminum (CFA) cathode powered by a ∼450 kV, ∼350 ns,
∼
50
Ω
HV
pulse generator is investigated by time-and-space-resolved electrical and optical diagnostics. A quasi stationary behavior of cathode plasma expansion into the vacuum gap was observed during the main pulse. The cathode plasma distribution is characterized by individual plasma spots. It was shown by optical and X-ray measurements that the uniformity of the extracted electron beam is satisfactory in spite of the individual plasma spots. A mechanism for this phenomenon is suggested. Relativistic electron beams, with the current densities up to 340 A/cm
2, were obtained. This class of CFA cathode may offer the promising prospect of high-current electron beam sources. |
Author | Wen, Jianchun Chang, Lei Wan, Hong Li, Limin Liu, Lie Xu, Qifu |
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Cites_doi | 10.1109/TPS.2005.844593 10.1063/1.1137097 10.1063/1.1345503 10.1209/0295-5075/82/55001 10.1088/0022-3727/41/12/125201 10.1109/TPS.2006.883374 10.1063/1.1415408 10.1063/1.2976753 10.1063/1.2794762 10.1063/1.2722227 10.1109/TPS.2008.926227 10.1109/TPS.2004.827608 10.1063/1.1516853 10.1063/1.2838240 |
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Snippet | In this Letter, plasma distribution on a carbon-fiber–aluminum (CFA) cathode powered by a ∼450 kV, ∼350 ns,
∼
50
Ω
HV
pulse generator is investigated by... |
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Title | Propagation of individual plasma spots on cathode surface by high-current discharge process |
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