TITLE

Increased atomic hydrogen flux from a cascaded arc plasma source by changing the nozzle geometry

AUTHOR(S)
Vankan, P.; Engeln, R.; Schram, D. C.
PUB. DATE
March 2005
SOURCE
Applied Physics Letters;3/7/2005, Vol. 86 Issue 10, p101501
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A very high flux of hydrogen atoms with energies in the eV range has been obtained by using a thermal plasma source and by optimization of the nozzle exit geometry. It proves that the flux of hydrogen atoms emerging from a cascaded arc plasma source depends strongly on the geometry of the nozzle. By decreasing the nozzle length by a factor 2, the atomic hydrogen flux is increased by a factor of 13, and a further increase of a factor of 2.5 can be obtained by increasing the nozzle diameter. The resulting atomic hydrogen flux is 1.2×1021 s-1, corresponding to a dissociation degree of over 30%. It is argued that the main loss channel for atomic hydrogen is surface recombination, and that by using nozzle geometries that reduce the surface loss, the atomic flux is increased.
ACCESSION #
16581533

 

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