Dynamics of the ionizing and magnetic fronts in the radial compression stage of a DPF current sheath

Further results regarding the sudden drop of dense plasma focus (DPF) neutron yield at low pressure are presented. Experimental measurements of temporal evolution of magnetic piston MP (interface plasma-magnetic field) and current sheath ionizing front IF (interface plasma-neutral gas) are performed...

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Bibliographic Details
Published in:IEEE transactions on plasma science 1993-08, Vol.21 (4), p.373-377
Main Authors: Milanese, M.M., Moroso, R.L., Pouzo, J.O.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700360 - Fusion Reactions- (1992-)
Acceleration
BARYONS
CHARGED-PARTICLE REACTIONS
COMPRESSION
Current measurement
DATA
DEUTERIUM
DEUTERIUM TARGET
DEUTERON REACTIONS
ELEMENTARY PARTICLES
Exact sciences and technology
EXPERIMENTAL DATA
FERMIONS
FUSION YIELD
HADRONS
HYDROGEN ISOTOPES
INFORMATION
IONIZATION
ISOTOPES
LIGHT NUCLEI
Magnetic confinement and equilibrium
Magnetic field measurement
MAGNETIC FIELDS
NEUTRONS
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUCLEOSYNTHESIS
NUMERICAL DATA
ODD-ODD NUCLEI
OPEN PLASMA DEVICES
Performance evaluation
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Pistons
Plasma density
PLASMA FOCUS DEVICES
Plasma measurements
Plasma sheaths
SHOCK WAVES
STABLE ISOTOPES
SYNTHESIS
TARGETS
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTIONS
Theta pinch
YIELDS
Z-Pinch, theta pinch, plasma focus and other pinch devices
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Summary:Further results regarding the sudden drop of dense plasma focus (DPF) neutron yield at low pressure are presented. Experimental measurements of temporal evolution of magnetic piston MP (interface plasma-magnetic field) and current sheath ionizing front IF (interface plasma-neutral gas) are performed in the radial compression stage of DPF discharges. At the optimum deuterium pressure for neutron yield (1.5 mb), MP and IF have similar r(t) functions, so that the thickness of the sheath remains practically constant ( approximately 0.2 cm) in the whole stage. At the lower pressure limit for neutron yield (1 mb) the sheath begins the radial compression stage with a smaller thickness ( approximately 0.1 cm) and in the last 35 ns the IF moves forward (relatively to the MP) with a velocity of 7.5E+7 cm/s and the thickness in the layer reaches a value of approximately 0.5 cm. This sudden acceleration of the IF is interpreted as the main cause of the lower pressure limit in the neutron yield.< >
ISSN:0093-3813
1939-9375
DOI:10.1109/27.234563