Results from core-edge experiments in high Power, high performance plasmas on DIII-D
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 f...
| Main Authors: | , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2017-08-01
|
| Series: | Nuclear Materials and Energy |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179116302526 |
| _version_ | 1819206940148891648 |
|---|---|
| author | T.W. Petrie M.E. Fenstermacher C.T. Holcomb T.H. Osborne S.L. Allen J.R. Ferron H.Y. Guo C.J. Lasnier A.W. Leonard T.C. Luce M.A. Makowski A.G. McLean D.C. Pace W.M. Solomon F. Turco M.A. VanZeeland J.G. Watkins |
| author_facet | T.W. Petrie M.E. Fenstermacher C.T. Holcomb T.H. Osborne S.L. Allen J.R. Ferron H.Y. Guo C.J. Lasnier A.W. Leonard T.C. Luce M.A. Makowski A.G. McLean D.C. Pace W.M. Solomon F. Turco M.A. VanZeeland J.G. Watkins |
| author_sort | T.W. Petrie |
| collection | DOAJ |
| description | 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 |
| first_indexed | 2024-12-23T05:15:35Z |
| format | Article |
| id | doaj.art-41f3c34d12f0415fa90c73c675955ca4 |
| institution | Directory Open Access Journal |
| issn | 2352-1791 |
| language | English |
| last_indexed | 2024-12-23T05:15:35Z |
| publishDate | 2017-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Materials and Energy |
| spelling | doaj.art-41f3c34d12f0415fa90c73c675955ca42022-12-21T17:58:50ZengElsevierNuclear Materials and Energy2352-17912017-08-011211411145Results from core-edge experiments in high Power, high performance plasmas on DIII-DT.W. Petrie0M.E. Fenstermacher1C.T. Holcomb2T.H. Osborne3S.L. Allen4J.R. Ferron5H.Y. Guo6C.J. Lasnier7A.W. Leonard8T.C. Luce9M.A. Makowski10A.G. McLean11D.C. Pace12W.M. Solomon13F. Turco14M.A. VanZeeland15J.G. Watkins16General Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USA; Corresponding author.Lawrence Livermore National Laboratory, Livermore, CA, USALawrence Livermore National Laboratory, Livermore, CA, USAGeneral Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USALawrence Livermore National Laboratory, Livermore, CA, USAGeneral Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USAGeneral Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USALawrence Livermore National Laboratory, Livermore, CA, USAGeneral Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USAGeneral Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USALawrence Livermore National Laboratory, Livermore, CA, USALawrence Livermore National Laboratory, Livermore, CA, USAGeneral Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USAGeneral Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USAColumbia University, New York, NY, USAGeneral Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USASandia National Laboratories, Albuquerque, NM, USASignificant 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 depositionhttp://www.sciencedirect.com/science/article/pii/S2352179116302526 |
| spellingShingle | T.W. Petrie M.E. Fenstermacher C.T. Holcomb T.H. Osborne S.L. Allen J.R. Ferron H.Y. Guo C.J. Lasnier A.W. Leonard T.C. Luce M.A. Makowski A.G. McLean D.C. Pace W.M. Solomon F. Turco M.A. VanZeeland J.G. Watkins Results from core-edge experiments in high Power, high performance plasmas on DIII-D Nuclear Materials and Energy |
| title | Results from core-edge experiments in high Power, high performance plasmas on DIII-D |
| title_full | Results from core-edge experiments in high Power, high performance plasmas on DIII-D |
| title_fullStr | Results from core-edge experiments in high Power, high performance plasmas on DIII-D |
| title_full_unstemmed | Results from core-edge experiments in high Power, high performance plasmas on DIII-D |
| title_short | Results from core-edge experiments in high Power, high performance plasmas on DIII-D |
| title_sort | results from core edge experiments in high power high performance plasmas on diii d |
| url | http://www.sciencedirect.com/science/article/pii/S2352179116302526 |
| work_keys_str_mv | AT twpetrie resultsfromcoreedgeexperimentsinhighpowerhighperformanceplasmasondiiid AT mefenstermacher resultsfromcoreedgeexperimentsinhighpowerhighperformanceplasmasondiiid AT ctholcomb resultsfromcoreedgeexperimentsinhighpowerhighperformanceplasmasondiiid AT thosborne resultsfromcoreedgeexperimentsinhighpowerhighperformanceplasmasondiiid AT slallen resultsfromcoreedgeexperimentsinhighpowerhighperformanceplasmasondiiid AT jrferron resultsfromcoreedgeexperimentsinhighpowerhighperformanceplasmasondiiid AT hyguo resultsfromcoreedgeexperimentsinhighpowerhighperformanceplasmasondiiid AT cjlasnier resultsfromcoreedgeexperimentsinhighpowerhighperformanceplasmasondiiid AT awleonard resultsfromcoreedgeexperimentsinhighpowerhighperformanceplasmasondiiid AT tcluce resultsfromcoreedgeexperimentsinhighpowerhighperformanceplasmasondiiid AT mamakowski resultsfromcoreedgeexperimentsinhighpowerhighperformanceplasmasondiiid AT agmclean resultsfromcoreedgeexperimentsinhighpowerhighperformanceplasmasondiiid AT dcpace resultsfromcoreedgeexperimentsinhighpowerhighperformanceplasmasondiiid AT wmsolomon resultsfromcoreedgeexperimentsinhighpowerhighperformanceplasmasondiiid AT fturco resultsfromcoreedgeexperimentsinhighpowerhighperformanceplasmasondiiid AT mavanzeeland resultsfromcoreedgeexperimentsinhighpowerhighperformanceplasmasondiiid AT jgwatkins resultsfromcoreedgeexperimentsinhighpowerhighperformanceplasmasondiiid |