Soft X-Ray Innovative Source Development Program

Recent models predict that individual wires in an array will form heterogeneous current channels when exploded by a current pulse. The resulting non uniform magnetic forces will cause the outer current carrying corona to implode ahead of the core, in contrast to earlier models where the uniform curr...

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Bibliographic Details
Main Authors: Yadlowsky, Edward J, Moschella, John J, Hazelton, Robert C, Settersten, Thomas B
Format: Report
Language:English
Subjects:
ABSORPTION
ALUMINUM
ARRAYS
ATOMIC PROPERTIES
CHANNELS
COATINGS
CORES
CORONAS
CURRENTS
DISTRIBUTION
DYNAMICS
EFFICIENCY
Electricity and Magnetism
ELECTRONS
ENERGY LEVELS
EXPLOSIONS
GENERATORS
HIGH RESOLUTION
HOLOGRAPHY
IMPLOSIONS
Inorganic Chemistry
K-SHELL
LASERS
MACHINES
MAGNESIUM
MAGNETIC FORCES
MASS
Nuclear Physics & Elementary Particle Physics
PE62715H
PLASMA OPENING SWITCHES
Plasma Physics and Magnetohydrodynamics
PLASMAS(PHYSICS)
POS(PLASMA OPENING SWITCHES)
PULSES
RADIATION
SOFT X RAYS
WIRE
WUDH053570
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Summary:Recent models predict that individual wires in an array will form heterogeneous current channels when exploded by a current pulse. The resulting non uniform magnetic forces will cause the outer current carrying corona to implode ahead of the core, in contrast to earlier models where the uniform current channel implodes as a unit. Laser based absorption and holographic techniques have been used to study the explosion characteristics of 33 micrometers C and 25 micrometers Al wire loads and the implosion dynamics of two wire Al loads on a 300 kA generator. X-ray techniques have been used to study the implosion and radiation characteristics of Mg coated Al wire arrays on the 4 MA Double Eagle generator. The high resolution laser diagnostics reveal a coronal plasma that implodes far in advance of the core in the two wire experiments. This preemptive implosion of the corona is exacerbated when a POS shortens the current pulse. The Mg coated Al wire load experiments indicate that only the outer 30-50% of the load mass implodes to radiate in the K-shell. The load straggling implies a softened implosion and reduced radiation efficiency. The results demonstrate the importance of the early time current distribution on the implosion and radiation characteristics of the load and underscore the need for adequate modeling to scale present results up to larger machines. Implosion, Wire array, POS, Coronal plasma, K-Shell.