Radial space potential measurements in the central cell of the tandem mirror experiment with a heavy-ion-beam probe

Technical Report · Mon Apr 11 00:00:00 EST 1983

DOI:https://doi.org/10.2172/6243328· OSTI ID:6243328

Hallock, G A

Spatial and temporal profiles of the space potential in the central-cell midplane of TMX have been obtained with a heavy-ion-beam probe. The absolute accuracy of measurements is +- 25 volts (with respect to the machine vacuum walls) with a resolution of approx. 2 volts. During moderate fueling with the gas boxes (i/sub gas/ approx. = 1200 Atom-Amperes D/sub 2/), the plasma potential is parabolic to at least 25 cm radius, with phi/sub e/ approx. = phi/sub max/(1-(r/32)/sup 2/) and 300 < phi/sub max/ <450 volts. With puffer-valve fueling, the space potential is relatively flat to at least 27 cm radius, with 250 < phi/sub e/ < 350 volts.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6243328
• Report Number(s): UCID-19759; ON: DE83013284
• Resource Relation: Other Information: Portions are illegible in microfiche products. Original copy available until stock is exhausted
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PLASMA DIAGNOSTICS
HEAVY IONS
TMX DEVICES
ELECTRIC POTENTIAL
PLASMA CONFINEMENT
PROBES
SPACE CHARGE
SPATIAL DISTRIBUTION
CHARGED PARTICLES
CONFINEMENT
DISTRIBUTION
IONS
MAGNETIC MIRRORS
OPEN PLASMA DEVICES
THERMONUCLEAR DEVICES
700102* - Fusion Energy- Plasma Research- Diagnostics