Analyses of Divertor Regimes in NSTX
Conference
·
OSTI ID:15014261
Identification of divertor operating regimes is of particular importance for heat and particle control optimization in high performance plasmas of a spherical torus, because of the magnetic geometry effects and compactness of the divertor region. Recent measurements of radiated power, heat and particle fluxes in lower single null and double null plasmas with 0.8 - 6 MW NBI heating suggest that the inner divertor is detached at {bar n} {sub e} {<=} 2-3x10{sub 19} m{sup -3} whereas the outer divertor is attached, operating in the high recycling regime. This resilient state exists in most L- and H-mode plasmas. The inner divertor transiently re-attaches in ELMy H-mode plasmas when heat pulses from type I or type III ELMs hit the divertor.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15014261
- Report Number(s):
- UCRL-CONF-204571
- Country of Publication:
- United States
- Language:
- English
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