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Results from core-edge experiments in high Power, high performance plasmas on DIII-D
- Source :
- Nuclear Materials and Energy, Vol 12, Iss , Pp 1141-1145 (2017)
- Publication Year :
- 2017
- Publisher :
- Elsevier, 2017.
-
Abstract
- Significant challenges to reducing divertor heat flux in highly powered near-double null divertor (DND) hybrid plasmas, while still maintaining both high performance metrics and low enough density for application of RF heating, are identified. For these DNDs on DIII-D, the scaling of the peak heat flux at the outer target (q⊥P) ∝ [PSOL x IP] 0.92 for PSOL= 8−19MW and IP= 1.0–1.4MA, and is consistent with standard ITPA scaling for single-null H-mode plasmas. Two divertor heat flux reduction methods were tested. First, applying the puff-and-pump radiating divertor to DIII-D plasmas may be problematical at high power and H98 (≥ 1.5) due to improvement in confinement time with deuterium gas puffing which can lead to unacceptably high core density under certain conditions. Second, q⊥P for these high performance DNDs was reduced by ≈35% when an open divertor is closed on the common flux side of the outer divertor target (“semi-slot”) but also that heating near the slot opening is a significant source for impurity contamination of the core. PSI-22 keywords: DIII-D, Divertor geometry, Gas injection and fueling, Impurity sources, Power deposition
- Subjects :
- Nuclear engineering. Atomic power
TK9001-9401
Subjects
Details
- Language :
- English
- ISSN :
- 23521791
- Volume :
- 12
- Issue :
- 1141-1145
- Database :
- Directory of Open Access Journals
- Journal :
- Nuclear Materials and Energy
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.41f3c34d12f0415fa90c73c675955ca4
- Document Type :
- article
- Full Text :
- https://doi.org/10.1016/j.nme.2016.10.029