Research support for plasma diagnostics on Elmo Bumpy Torus: study of diamagnetic measurements for the electron rings and development of a ferromagnetic resonance magnetometer

Technical Report · Thu Oct 01 00:00:00 EDT 1981

DOI:https://doi.org/10.2172/5601835· OSTI ID:5601835

Carpenter, K. H.; daSilva, M. K.

The bumpy cylinder MHD equilibrium code which was compared to the concentric current sheet model for the EBT electron rings in a previous report has been subjected to additional numerical tests which confirm the validity of the previous work. Further analysis of the current sheet model as a means of calibration of the EBT diamagnetic diagnostic for perpendicular energy shows the model's simplicity is not the limiting factor in accuracy of the calibration. The fluctuations of the currents in the vacuum field coils were observed as voltage signals from the generator shunts. Significant low frequency components were observed that cannot be removed from diamagnetic signals by low pass filtering alone. A YIG magnetometer was developed and used to make test measurements of the diamagnetic field of the electron rings on EBT. The field values observed were on the order of 1 Gauss in a region where the vacuum field was about 600 Gauss. These values agree with the perpendicular energy diamagnetic flux diagnostic with reasonable assumptions for ring geometry.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Missouri Univ., Rolla (USA). Dept. of Electrical Engineering
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5601835
• Report Number(s): ORNL/Sub-7676/2; ON: DE82007245; TRN: 82-008445
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELMO BUMPY TORUS
PLASMA DIAGNOSTICS
PLASMA DIAMAGNETISM
MAGNETOMETERS
DESIGN
CALIBRATION
ELECTRON RINGS
DIAMAGNETISM
ELMO DEVICES
MAGNETIC MIRRORS
MAGNETISM
MEASURING INSTRUMENTS
OPEN PLASMA DEVICES
THERMONUCLEAR DEVICES
700102* - Fusion Energy- Plasma Research- Diagnostics