Calculation of Eddy Currents In the CTH Vacuum Vessel and Coil Frame

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Knowledge of eddy currents in the vacuum vessel walls and nearby conducting support structures can significantly contribute to the accuracy of Magnetohydrodynamics (MHD) equilibrium reconstruction in toroidal plasmas. Moreover, the magnetic fields produced by the eddy currents could generate error fields that may give rise to islands at rational surfaces or cause field lines to become chaotic. In the Compact Toroidal Hybrid (CTH) device (R0 = 0.75 m, a = 0.29 m, B ≤ 0.7 T), the primary driver of the eddy currents during the plasma discharge is the changing flux of the ohmic heating transformer. Electromagnetic simulations are used ... continued below

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Zolfaghari, A.; Brooks, A; Michaels, A.; Hanson, J. & Hartwell, G. September 25, 2012.

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Knowledge of eddy currents in the vacuum vessel walls and nearby conducting support structures can significantly contribute to the accuracy of Magnetohydrodynamics (MHD) equilibrium reconstruction in toroidal plasmas. Moreover, the magnetic fields produced by the eddy currents could generate error fields that may give rise to islands at rational surfaces or cause field lines to become chaotic. In the Compact Toroidal Hybrid (CTH) device (R0 = 0.75 m, a = 0.29 m, B ≤ 0.7 T), the primary driver of the eddy currents during the plasma discharge is the changing flux of the ohmic heating transformer. Electromagnetic simulations are used to calculate eddy current paths and profile in the vacuum vessel and in the coil frame pieces with known time dependent currents in the ohmic heating coils. MAXWELL and SPARK codes were used for the Electromagnetic modeling and simulation. MAXWELL code was used for detailed 3D finite-element analysis of the eddy currents in the structures. SPARK code was used to calculate the eddy currents in the structures as modeled with shell/surface elements, with each element representing a current loop. In both cases current filaments representing the eddy currents were prepared for input into VMEC code for MHD equilibrium reconstruction of the plasma discharge. __________________________________________________

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  • Topical Meeting on the Technology of Fusion Energy (August 27-31, 2012)
  • Fusion Science and Technology

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  • Report No.: PPPL-4814
  • Grant Number: DE-ACO2-09CH11466
  • Office of Scientific & Technical Information Report Number: 1057033
  • Archival Resource Key: ark:/67531/metadc845123

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  • September 25, 2012

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  • May 19, 2016, 9:45 a.m.

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  • June 16, 2017, 10:16 a.m.

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Zolfaghari, A.; Brooks, A; Michaels, A.; Hanson, J. & Hartwell, G. Calculation of Eddy Currents In the CTH Vacuum Vessel and Coil Frame, article, September 25, 2012; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc845123/: accessed November 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.