Physics
Scientific paper
Nov 1950
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1950natur.166..903t&link_type=abstract
Nature, Volume 166, Issue 4230, pp. 903-904 (1950).
Physics
4
Scientific paper
IT has been found that the self-magnetic field associated with the flow of current in a low-pressure discharge (mercury vapour at less than 2 × 10-3 mm. pressure) plays an important part in determining the radial density distribution at currents as low as 30 amp. The effect of this magnetic field can be treated by adding a `magnetic potential' term to the electrostatic potential Vs in the Boltzmann equation, wmacr1 being the longitudinal electron-drift velocity. The drift of electrons and ions to the tube walls is equalized at low arc currents by a radial electric field. Since the self-magnetic field tends to reduce the drift of electrons to the walls while having a negligible influence on the positive ions, increasing the arc current leads to a progressive reduction in the radial electric field.
Cowhig W. T.
Thonemann P. C.
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