Ionization effect on the beam plasma interaction = 전자빔과 플라즈마의 상호작용에 이온화가 미치는 영향

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The interaction between the beam and its self-produced plasma has been studied using the one dimensional particle-in-cell (PIC) code in bounded and open systems. 1KeV electron beam is injected into the neutral gas mixed with a negligible amount of plasma. Wide range of the neutral gas density is covered in this study. In the bounded system, the stagnation region forms initially near the emitter. The secondary electrons generated beyond the stagnation region are accelerated toward the right boundary (collector) and ionize the neutral gas, so that the stagnation region rapidly expands. The beam-plasma instability sets in when the stagnation point reaches the right boundary, and a cascade-like ionization (by the heated electrons) is observed thereafter. However, instabilities are not observed in the open system. Both the beam electrons and the secondary electrons are attracted to the emitter, and the stagnation region formed near the emitter does not expand. The electrostatic energy saturates in the high pressure regime, as predicted by the classical energy deposition theory. Linear dependence of the saturation level on the mean free path is observed.
Advisors
Min, Kyoung-Wookresearcher민경욱researcher
Description
한국과학기술원 : 물리학과,
Publisher
한국과학기술원
Issue Date
1992
Identifier
59979/325007 / 000901245
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 물리학과, 1992.2, [ ii, 83 p. ]

URI
http://hdl.handle.net/10203/47867
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=59979&flag=dissertation
Appears in Collection
PH-Theses_Master(석사논문)
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