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Feedback system for divertor impurity seeding based on real-time measurements of surface heat flux in the Alcator C-Mod tokamak

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Academic year: 2019

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Figure 1 Cross section of Alcator C-Mod showing the location of the surface thermocouples in the outer divertor where the plasma heat flux is typically the largest and the gas tube injecting impurities in the “gas box” behind the divertor module
Figure 2 Schematic of the discrete RC transmission line used as an analog computer for real-time calculations of surface heat flux
Figure 3 Comparison of the response of the real-time analog heat flux computer and the post-discharge digital computation during a plasma discharge where the Lower Hybrid (LH) auxiliary power was modulated
Figure 4 Demonstration of the heat flux feedback system. Red traces are from a plasma discharge with the heat flux feedback system off and blue traces are from a repeated discharge with it on

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