Compatibility of detached divertor operation with robust edge pedestal performance

Leonard, Anthony W.; Makowski, Michael A.; McLean, A. G.; Osborne, Thomas H.; Snyder, Philip B.

doi:10.1016/j.jnucmat.2014.11.007

Compatibility of detached divertor operation with robust edge pedestal performance

Journal Article · Tue Nov 11 00:00:00 EST 2014 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2014.11.007· OSTI ID:1890823

Leonard, Anthony W. ^[1]; Makowski, Michael A. ^[2]; McLean, A. G. ^[2]; Osborne, Thomas H. ^[1]; Snyder, Philip B. ^[1]

General Atomics, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Here the compatibility of detached radiative divertor operation with a robust H-mode pedestal is examined in DIII-D. A density scan produced low temperature plasmas at the divertor target, T_e $$\leqslant$$ 2 eV, with high radiation leading to a factor of $$\geqslant$$4 drop in peak divertor heat flux. The cold radiative plasma was confined to the divertor and did not extend across the separatrix in X-point region. A robust H-mode pedestal was maintained with a small degradation in pedestal pressure at the highest densities. The response of the pedestal pressure to increasing density is reproduced by the EPED pedestal model. However, agreement of the EPED model with experiment at high density requires an assumption of reduced diamagnetic stabilization of edge Peeling–Ballooning modes.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC52-07NA27344; FC02-04ER54698

OSTI ID:: 1890823

Alternate ID(s):: OSTI ID: 22460665
OSTI ID: 1252287

Report Number(s):: LLNL-JRNL-839024; 1059269

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Vol. 463; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Compatibility of detached divertor operation with robust edge pedestal performance

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