Analysis of NSTX Upgrade OH Magnet and Center Stack

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The new ohmic heating (OH) coil and center stack for the National Spherical Torus Experiment (NSTX) upgrade are required to meet cooling and structural requirements for operation at the enhanced 1 Tesla toroidal field and 2 MA plasma current. The OH coil is designed to be cooled in the time between discharges by water flowing in the center of the coil conductor. We performed resistive heating and thermal hydraulic analyses to optimize coolant channel size to keep the coil temperature below 100 C and meet the required 20 minute cooling time. Coupled electromagnetic, thermal and structural FEA analyses were performed ... continued below

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A. Zolfaghari, P. Titus, J. Chrzanowski, A. Salehzadeh, F. Dahlgren November 30, 2010.

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The new ohmic heating (OH) coil and center stack for the National Spherical Torus Experiment (NSTX) upgrade are required to meet cooling and structural requirements for operation at the enhanced 1 Tesla toroidal field and 2 MA plasma current. The OH coil is designed to be cooled in the time between discharges by water flowing in the center of the coil conductor. We performed resistive heating and thermal hydraulic analyses to optimize coolant channel size to keep the coil temperature below 100 C and meet the required 20 minute cooling time. Coupled electromagnetic, thermal and structural FEA analyses were performed to determine if the OH coil meets the requirements of the structural design criteria. Structural response of the OH coil to its self-field and the field from other coils was analyzed. A model was developed to analyze the thermal and electromagnetic interaction of centerstack components such as the OH coil, TF inner legs and the Bellville washer preload mechanism. Torsional loads from the TF interaction with the OH and poloidal fields are transferred through the TF flag extensions via a torque transfer coupling to the rest of the tokamak structure. A 3D FEA analysis was performed to qualify this design. The results of these analyses, which will be presented in this paper, have led to the design of OH coil and centerstack components that meet the requirements of the NSTX-upgrade structural design criteria.

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  • Topical Meeting on the Technology of Fusion - ANS (Nov. 7-11, 2010, Las Vegas, Nevada

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  • Report No.: PPPL-4578
  • Grant Number: DE-ACO2-09CH11466
  • Office of Scientific & Technical Information Report Number: 1001669
  • Archival Resource Key: ark:/67531/metadc837659

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  • November 30, 2010

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 2:26 p.m.

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A. Zolfaghari, P. Titus, J. Chrzanowski, A. Salehzadeh, F. Dahlgren. Analysis of NSTX Upgrade OH Magnet and Center Stack, article, November 30, 2010; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc837659/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.