Stress Multipliers for the NSTX Upgrade Digital Coil Protection System
Authors: P.H. Titus, R. Woolley and R. Hatcher
Abstract:
Conceptual design of the upgrade to NSTX, explored
designs sized to accept the worst loads that power supplies could
produce. This produced excessive structures that would have
been difficult to install and were much more costly than needed
to meet the scenarios required for the upgrade mission. Instead,
the project decided to rely on a digital coil protection system
(DCPS). Initial sizing was then based on the 96 scenarios in the
project design point with some headroom to accommodate
operational flexibility and uncertainty. This has allowed coil
support concepts that minimize alterations to the existing
hardware. The digital coil protection system theory , hardware
and software are described in another paper at this conference.
The intention of this paper is to describe the generation of stress
multipliers, and algorithms that are used to characterize the
stresses at key areas in the tokamak, as a function of either loads
calculated by the influence coefficients computed in the DCPS
software, or directly from the coil currents.
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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-4675 (pdf 1.53 MB 6 pp)
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