Radial Plasma Dynamic in Sequential Pinches

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 ex...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2009-11, Vol.37 (11), p.2186-2190
Main Authors: Kayama, M.E., Clemente, R.A., Honda, R.Y., Dobrowolsky, M.S.
Format: Article
Language:English
Subjects:
Density
Electric and magnetic measurements
Electric discharges
Exact sciences and technology
Fluctuations
Gases
Hydrogen
Implosions
Low pressure
Magnetic confinement
Magnetic fields
Magnetic-field measurement
Magnetism
Magnetohydrodynamics
Mathematical models
modeling
Oscillations
Oscillators
Other gas discharges
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Plasma
Plasma confinement
Plasma diagnostic techniques and instrumentation
Plasma dynamics
plasma generation
plasma pinch
Plasma production and heating
Plasma properties
Plasma sources
Plasma temperature
Plasma waves
Probes
Waveforms
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Summary: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.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2009.2031868