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

Vankan, P.; Engeln, R.; Schram, D. C.
March 2005
Applied Physics Letters;3/7/2005, Vol. 86 Issue 10, p101501
Academic Journal
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.


Related Articles

  • Pattern formation in nonextensive thermodynamics: Selection criterion based on the Renyi entropy production. Cybulski, Olgierd; Matysiak, Daniel; Babin, Volodymyr; Holyst, Robert // Journal of Chemical Physics;5/1/2005, Vol. 122 Issue 17, p174105 

    We analyze a system of two different types of Brownian particles confined in a cubic box with periodic boundary conditions. Particles of different types annihilate when they come into close contact. The annihilation rate is matched by the birth rate, thus the total number of each kind of...

  • Ab initio DFT calculations of the configurational and conformational preferences of 2-phenylsulfinylcyclohexanones — Evidence for "exo-anomeric" interactions. Trapp, Melissa L.; Wojcik, John F.; Zajac Jr., Walter W.; Pinto, B. Mario // Canadian Journal of Chemistry;Apr2006, Vol. 84 Issue 4, p685 

    The conformational analysis of 2-phenylsulfinylcyclohexanone by ab initio density functional calculations is described. Six conformations corresponding to axial/equatorial isomers and rotation about the exocyclic C2—S bond in each of the RR or RS diastereomers were calculated and the results...

  • Euclid's Fifth Postulate. Ravindran, Renuka // Resonance: Journal of Science Education;Apr2007, Vol. 12 Issue 4, p26 

    In this article, we review the fifth postulate of Euclid and trace its long and glorious history. That after two thousand years, it led to so much discussion and new ideas speaks for itself.

  • DIFERENCIA ENTRE SEMEJANZA Y PROPORCIONALIDAD GEOMÉTRICA DESDE UNA PERSPECTIVA HISTÓRICA. Lucía Quintero, Aura; Judith Molavoque, Mana; Alberto Guacaneme, Edgar // Revista de Ciencias;dic2012, Vol. 16, p75 

    Analyze the theory contained in the Books V and VI of Euclid's Elements to reveal that while in these are expressing definitions and propositions on the similarity, geometric proportionality is not limited to it. In this theoretical context, the similarity is a relation between rectilinear...

  • Local Cosmic string in Lyra geometry. Rahaman, F.; Mal, S. // Astrophysics & Space Science;Feb2006, Vol. 302 Issue 1-4, p3 

    A local cosmic string has been studied in the context of Lyra geometry. Following Vilenkin's prescription for the energy momentum tensor, it is shown that only exterior solution of the local string is consistent in Lyra geometry.

  • Theoretical study on the excited states of HCN. Nayak, Malaya K.; Chaudhuri, Rajat K.; Krishnamachari, S. N. L. G. // Journal of Chemical Physics;5/8/2005, Vol. 122 Issue 18, p184323 

    In the flash-photolysis of oxazole, iso-oxazole, and thiozole a transient band system was observed in the region 2500–3050 Å. This band system was attributed to a meta-stable form of HCN, i.e., either HNC or triplet HCN. Theoretical investigations have been carried out on the ground...

  • separation theorem of Mazur (20th century) Mathematics.  // Dictionary of Theories;2002, p482 

    Definition of the term separation theorem of Mazur is presented. It states that in n-dimensional Euclidean geometry, two sets of points which have the property that any line joining two points in the set lies entirely in the set are separated by a hyperplane, the n-dimensional analogue of a...

  • Limits of downstream hydraulic geometry. Wohl, Ellen // Geology;Oct2004, Vol. 32 Issue 10, p897 

    Adjustments to flow width, depth, and velocity in response to changes in discharge are commonly characterized by using down- stream hydraulic geometry relationships. The spatial limits of these relationships within a drainage basin have not been systematically quantified. Where the erosional...

  • Remarks, du côté de chez Tarski, on symmetric ternary relations. Pambuccian, Victor // Journal of Geometry;2006, Vol. 84 Issue 1/2, p94 

    We point out that the results in [12] are the model-theoretic counterpart of results established syntactically in [3] and [10], and that Martin’s theorem for the Euclidean 3- or higher-dimensional case, established in [5], does not depend on the Beckman-Quarles theorem, and can be...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics