Coupled Multiphysics Analysiss of the TF Coil Structure in the NSTX Upgrade
Authors: A. Zolfaghari, T. Willard, and M. Smith
Abstract:
The National Spherical Torus Experiment (NSTX) is being
upgraded to increase plasma current to 2 MA and central
toroidal magnetic field to 1 Tesla [1]. The upgrades include a
replacement of the centerstack and addition of a second neutral
beam. The Inner legs of the TF coil which are at the core of the
new larger NSTX upgrade center stack are designed to carry
twice the current of the existing TF coils. The inner and outer
legs of the TF coil are connected through a set of flexible straps
that allow for the thermal growth of the center stack and the out
of plane twisting moments in the TF coils. Electromagnetic
interaction of the TF, OH and PF coils results in loads on the TF
coil structure. The TF flexible straps and structural components
of the machine have to withstand these loads. Coupled
electromagnetic, thermal and structural analyses were
performed. The results of these analyses, which will be presented
in detail in this paper, have led to the validation of the design of
TF flexible straps and compliance with the requirements of the
NSTX structural design criteria.
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Submitted to: 38th International Conference on Plasma Science & 24th Symposium on Fusion Engineering/ICOPS 2011 SOFE, Chicago, IL, June 26-30, 2011
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Download PPPL-4680 (pdf 2.83 MB 5 pp)
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