Radial Plasma Dynamic in Sequential Pinches
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Data
2009-11-01
Autores
Kayama, Milton Eiji [UNESP]
Clemente, Roberto Antonio
Honda, Roberto Yzumi [UNESP]
Dobrowolsky, Marcelo Schubert
Título da Revista
ISSN da Revista
Título de Volume
Editor
Institute of Electrical and Electronics Engineers (IEEE)
Resumo
Plasma dynamic and confinement characteristics were investigated with magnetic probes in a theta pinch operating with oscillatory current waveform and hydrogen gas at pressure between 45 and 150 mtorr. Current-sheath implosion was evident after the third half cycle until sixth half cycle when the external current has practically decayed. Each cycle starts with a trapped reversed magnetic field residual from the previous half cycle. Probe-signal fluctuations due to radial hydromagnetic oscillations were also observed. A modified snowplow model including an initial bias field and a flux-loss term gives a reasonable description of the experimental results for plasma radial dynamic and internal trapped field. Typical equilibrium-density profiles are of a hollow type with maximum density around one-third of the discharge-tube radius. Estimations from these profiles show small variation of temperature and density among half cycles in discharges at low pressure. At high-pressure regime, the temperature strongly drops in subsequent half cycles, while the density increases.
Descrição
Palavras-chave
Magnetic-field measurement, modeling, plasma generation, plasma pinch
Como citar
IEEE Transactions on Plasma Science. Piscataway: IEEE-Inst Electrical Electronics Engineers Inc, v. 37, n. 11, p. 2186-2190, 2009.