Solder Development and Fabrication Techniques for Coolant Tube Bonding In Toroidal Field Conductors for the National Spherical Torus Experiment
Authors: Stephan Z. Jurczynski, et. al.
Abstract:
The National Spherical Torus Experiment (NSTX)
is being enhanced to significantly expand the operational space
for plasma conditions that are essential for next step Spherical
Torus (ST) engineering and scientific development.
Improvements to this leading, high performance ST include
doubling the magnetic toroidal field (TF) and plasma current
with a tenfold increase to the plasma discharge flat top duration.
This requires a Center Stack Upgrade (CSU) with almost double
the current capability of the TF inner conductors. Bonding water
cooling tubes in these new TF Conductors required developing
nonionic solder flux and a controlled, repeatable heating
technique.
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Submitted to: IEEE Journal aTransactions on Plasma Science, (April 20113) Presented at 25th Symposium on Fusion Engineering/California June 10-14 2013.
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Download PPPL-4888 (pdf 238 MB 6 pp)
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