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

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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 … continued below

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84 pages

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Carpenter, K. H. & daSilva, M. K. October 1, 1981.

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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.

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84 pages

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NTIS, PC A05/MF A01.

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  • October 1, 1981

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Carpenter, K. H. & daSilva, M. K. Research support for plasma diagnostics on Elmo Bumpy Torus: study of diamagnetic measurements for the electron rings and development of a ferromagnetic resonance magnetometer, report, October 1, 1981; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1087136/: accessed December 11, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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