Application of anomalous diffusion in production of negative ions

Journal Article · Thu Nov 01 00:00:00 EST 1984 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.864580· OSTI ID:5991417

Jimbo, K

The production of negative hydrogen ions is investigated in the reflex-type negative ion sources. When anomalous diffusion in the positive column was found by Hoh and Lehnert (Phys. Fluids 3, 600 (1960)), it was pointed out that the large particle loss produced by anomalous diffusion is compensated for by the larger particle production inside the plasma. In the present experiments anomalous diffusion was artificially encouraged by changing the radial electric field inside the reflex discharge. Apparent encouragement of negative ion current by the increase of the density fluctuation amplitude is observed. Twice as much negative ion current was obtained with the artificial encouragement as without. On the other hand, the larger extracted negative ion current was observed with a lower electron temperature, which is calculated from the anomalous diffusion coefficient derived from a simple nonlinear theory. This result is consistent with Wadehra's calculated results (Appl. Phys. Lett. 35, 917 (1979)).

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5991417
• Journal Information: Phys. Fluids; (United States), Vol. 27:11
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
HYDROGEN IONS 1 MINUS
ION SOURCES
CATHODES
DIFFUSION
ELECTRON TEMPERATURE
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
PLASMA INSTABILITY
ANIONS
CHARGED PARTICLES
ELECTRODES
FLUID MECHANICS
HYDRODYNAMICS
HYDROGEN IONS
INSTABILITY
IONS
MECHANICS
700104* - Fusion Energy- Plasma Research- Plasma Kinetics-Experimental- (-1987)