Tokamak Plasmas with Density up to 10 Times the Greenwald Limit

Hurst, N. C.; Chapman, B. E.; Sarff, J. S.; Almagri, A. F.; McCollam, K. J.; Den Hartog, D. J.; Flahavan, J. B.; Forest, C. B.

doi:10.1103/PhysRevLett.133.055101

Tokamak Plasmas with Density up to 10 Times the Greenwald Limit

Journal Article · Mon Jul 29 00:00:00 EDT 2024 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.133.055101· OSTI ID:2370426

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Univ. of Wisconsin, Madison, WI (United States)

Current-carrying, toroidal laboratory plasmas typically cannot be sustained with an electron density above the empirical Greenwald limit. Presented here are tokamak experiments in the Madison Symmetric Torus with a density up to an unprecedented level about ten times this limit. This is thought to be made possible in part by a thick, stabilizing, conductive wall, and a high-voltage, feedback-controlled power supply driving the plasma current. The radial profile of the toroidal current flattens around twice the limit, without the edge collapse routinely observed in other experiments.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: National Science Foundation; USDOE; USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: SC0018266; SC0020245

OSTI ID:: 2370426

Alternate ID(s):: OSTI ID: 2474315

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 133; ISSN 1079-7114; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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