Development of MAST-U Langmuir Probe Interpretation Through Particle-in-cell Simulation and Experiment

Jack Leland
Interpreting flush-mounted Langmuir probes at small angles of magnetic field incidence –routinely found in tokamak plasma facing components (PFCs) by design – is notoriously problematic due to the difficulty of accounting properly for sheath expansion. The Mega Amp Spherical Tokamak Upgrade (MAST-U) has 850 probes installed with a novel probe tip designed to mitigate the effects of sheath expansion. This angled-tip design has been investigated through experimental and computational means, to both verify that the...
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