Study of plasma confinement in ELMO Bumpy Torus with a heavy-ion beam probe

Technical Report · Thu Jan 01 00:00:00 EST 1981

DOI:https://doi.org/10.2172/6755049· OSTI ID:6755049

Bieniosek, F. M.

Plasma confinement in ELMO Bumpy Torus (EBT) is generally strongly dependent on an ambipolar electric field. Spatially resolved measurements of the resulting electric space potential phi/sub sp/ have been made in a single plasma cross section by the heavy-ion beam probe. This diagnostic injects a 4-60-keV beam of (usually) Cs/sup +/ ions into the plasma. Measurement of the energy of Cs/sup 2 +/ secondary ions leaving the plasma gives a continuous monitor of the local space potential. In addition, the total detected Cs/sup 2 +/ ion current is proportional to the product of the local electron density and the ionization rate, which, in turn, is a function of the electron temperature. This signal, nf(T/sub e/), is sensitive to all three electron distributions found in EBT - those of the cold surface plasma, the warm core plasma, and the hot electron ring.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6755049
• Report Number(s): ORNL/TM-7487; TRN: 81-002465
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELMO BUMPY TORUS
PLASMA DIAGNOSTICS
ION BEAMS
CESIUM IONS
ELECTRIC FIELDS
PLASMA CONFINEMENT
PROBES
BEAMS
CHARGED PARTICLES
CONFINEMENT
ELMO DEVICES
IONS
MAGNETIC MIRRORS
OPEN PLASMA DEVICES
THERMONUCLEAR DEVICES
700102* - Fusion Energy- Plasma Research- Diagnostics