Space potential profiles in ELMO Bumpy Torus (EBT) experiment

Journal Article · Mon Aug 01 04:00:00 EDT 1983 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.864382· OSTI ID:5830030

Bieniosek, F M; Connor, K A

Spatially resolved measurements of the electric space potential in the ELMO Bumpy Torus (EBT) have been made by a heavy ion beam probe. The EBT-I device is characterized by positive potentials in the surface plasma the order of 100 V and by a nearly symmetric potential well in the core plasma of up to 300 V with respect to the surface potential. The EBT-S device has a similar potential structure with well depth and peak potential similar to or greater than that of EBT-I. Peak potential and well depth increase as the edge gas pressure is lowered and as the microwave power is increased. The potential structure is strongly linked to the specific heating geometry. The ambipolar electric field is large enough generally to dominate the core electron neoclassical diffusion. The potential profile is approximately parabolic in the core, which is shown to be a natural consequence of the spatially uniform plasma source function.

• Research Organization: McDonnell Douglas Astronautics Company, St. Louis, Missouri 63166
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5830030
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 26:8; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
ELECTRIC POTENTIAL
ELMO BUMPY TORUS
ELMO DEVICES
ION PROBES
MAGNETIC MIRRORS
OPEN PLASMA DEVICES
PLASMA
PLASMA DIAGNOSTICS
PROBES
THERMONUCLEAR DEVICES