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1 edition of Surface dynamics of unipolar arcing found in the catalog.

Surface dynamics of unipolar arcing

Richard Keith Downs

Surface dynamics of unipolar arcing

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  • 7 Currently reading

Published by Naval Postgraduate School, Available from the National Technical Information Service in Monterey, Calif, Springfield, Va .
Written in English


Edition Notes

ContributionsSchwirzke, Fred R.
The Physical Object
Pagination88 p.
Number of Pages88
ID Numbers
Open LibraryOL25508183M


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Surface dynamics of unipolar arcing by Richard Keith Downs Download PDF EPUB FB2

One should note that such a large scale exfoliation due to unipolar arcing may enhance the surface erosion of the tungsten armour and act as a serious impurity source for. The occurrence and damage of unipolar arcing on fuzzy tungsten Article in Journal of Nuclear Materials August with 62 Reads How we measure 'reads'.

In the case of the D-III D tokamak, the mass concentration was found to be in J. Winter / Formation of dust and its role infusion devices from metal wall elements by unipolar arcing, transported via the plasma to the limiter surface and, as their surface mobility increases when the limiter gets hot from to the thermal load of the plasma, they Cited by: 5.

Furthermore we consider the current flow to the anode, expecially for the example of the “unipolar arc”. Conditions are formulated for the existence of such an arc. Surface phenomena contributing to this mode, like for instance explosive phenomena, are discussed. The book will serve as a text book, text-related or reference book for graduate students, post graduates, and scientists in geo-astro, space, and laboratory plasma physics, electromagnetics and fluid dynamics.

In addition, it will be useful for researchers outside the plasma community who wish to obtain new physical insights, aspects, and. Power electronics switching devices currently represent the dominant technology for supplying low voltage (LV) electric motors.

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Everyone has seen a hot cathode arcing, as in a welding arc, where electrons are freed from the metal surface of the electrode by heat. The metal is heated by its own resistance to current, and begins emitting electrons above a certain temperature threshold specific to the electrode material.

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Thursday, Novem And these first two examples replicate the arcing along the surface of Searl's spinning metallic disk. (as described in Joseph Cater's book cited above) generates an electrostatic field, contrary to the dynamics of a homopolar/unipolar electromagnetic field of motion.

In other words, a. The particles are charged to the same polarity as the unipolar corona ions. Thus, the electric field gradient near the discharge electrode decreases, reducing the flow and mobil- ity of ions. Since for submicron particles, diffusion charging is the prin- cipal means of particle charging, reduction in ion mobility affects particle charging.

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A corona (Latin, 'crown') is an aura of plasma that surrounds the sun and other celestial bodies. The Sun's corona extends millions of kilometres into space and is most easily seen during a total solar eclipse, but it is also observable with a coronagraph.

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The results of experimental works on unipolar arcs, e.g. [1], suggest that there are two phases of unipolar arcing. An intense external energy flux, i.e., the laser pulse (or ELM), causes significant heating of a wide region of the surface of an isolated plate, current transfer is initiated and the potential difference between the plasma and.

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