Compatibility of detached divertor operation with robust edge pedestal performance
- 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, Te $$\leqslant$$ 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.
- 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: 1252287
- Report Number(s):
- LLNL-JRNL-839024; 1059269; TRN: US2310089
- Journal Information:
- Journal of Nuclear Materials, Vol. 463; ISSN 0022-3115
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Effects of divertor geometry on H-mode pedestal structure in attached and detached plasmas in the DIII-D tokamak
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journal | July 2018 |
Developing physics basis for the snowflake divertor in the DIII-D tokamak
|
journal | February 2018 |
A review of direct experimental measurements of detachment
|
journal | February 2018 |
Plasma detachment in divertor tokamaks
|
journal | February 2018 |
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