High heat flux Langmuir probe array for the DIII-D divertor plates.

The Review of scientific instruments (2008-12-03)
J G Watkins, D Taussig, R L Boivin, M A Mahdavi, R E Nygren
摘要

Two modular arrays of Langmuir probes designed to handle a heat flux of up to 25 MW/m(2) for 10 s exposures have been installed in the lower divertor target plates of the DIII-D tokamak. The 20 pyrolytic graphite probe tips have more than three times higher thermal conductivity and 16 times larger mass than the original DIII-D isotropic graphite probes. The probe tips have a fixed 12.5 degree surface angle to distribute the heat flux more uniformly than the previous 6 mm diameter domed collectors and a symmetric "rooftop" design to allow operation with reversed toroidal magnetic field. A large spring-loaded contact area improves heat conduction from each probe tip through a ceramic insulator into a cooled graphite divertor floor tile. The probe tips, brazed to molybdenum foil to ensure good electrical contact, are mounted in a ceramic tray for electrical isolation and reliable cable connections. The new probes are located 1.5 cm radially apart in a staggered arrangement near the entrance to the lower divertor pumping baffle and are linearly spaced 3 cm apart on the shelf above the in-vessel cryopump. Typical target plate profiles of J(sat), T(e), and V(f) with 4 mm spatial resolution are shown.

材料
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钼, foil, 6mm disks, thickness 0.5mm, annealed, 99.9%
钼, foil, 6mm disks, thickness 0.75mm, annealed, 99.9%
钼, foil, 8mm disks, thickness 0.005mm, 99.9%
钼, foil, 8mm disks, thickness 0.006mm, 99.9%
钼, foil, 8mm disks, thickness 0.007mm, 99.9%
钼, foil, 8mm disks, thickness 0.008mm, 99.9%
钼, foil, 8mm disks, thickness 0.009mm, 99.9%
钼, foil, 8mm disks, thickness 0.0125mm, 99.9%
钼, foil, 8mm disks, thickness 0.015mm, annealed, 99.9%
钼, foil, 8mm disks, thickness 0.015mm, as rolled, 99.9%
钼, foil, 8mm disks, thickness 0.01mm, 99.9%
钼, foil, 8mm disks, thickness 0.01mm, annealed, 99.9%
钼, foil, 8mm disks, thickness 0.020mm, annealed, 99.9%
钼, foil, 8mm disks, thickness 0.025mm, annealed, 99.9%
钼, foil, 8mm disks, thickness 0.03mm, annealed, 99.9%
钼, foil, 8mm disks, thickness 0.05mm, annealed, 99.9%
钼, foil, 8mm disks, thickness 0.075mm, annealed, 99.9%
钼, foil, 8mm disks, thickness 0.125mm, annealed, 99.9%
钼, foil, 8mm disks, thickness 0.15mm, annealed, 99.9%
钼, foil, 8mm disks, thickness 0.1mm, annealed, 99.9%
钼, foil, 8mm disks, thickness 0.20mm, annealed, 99.9%
钼, foil, 8mm disks, thickness 0.25mm, annealed, 99.9%
钼, foil, 8mm disks, thickness 0.30mm, annealed, 99.9%
钼, foil, 8mm disks, thickness 0.5mm, annealed, 99.9%
钼, foil, 8mm disks, thickness 0.75mm, annealed, 99.9%
钼, foil, light tested, 100x100mm, thickness 0.008mm, 99.9%
钼, foil, light tested, 100x100mm, thickness 0.0125mm, 99.9%
钼, foil, light tested, 100x100mm, thickness 0.01mm, 99.9%
钼, foil, light tested, 100x100mm, thickness 0.01mm, annealed, 99.9%
钼, foil, light tested, 100x100mm, thickness 0.05mm, annealed, 99.9%

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