The role of edge fueling in determining the pedestal density in high neutral opacity Alcator C-Mod experiments
SOLPS-ITER modeling of EDA H-mode experiments on Alcator C-Mod find that the electron density pedestal structure is unaffected by increased gas fueling when approaching ITER-like opaqueness conditions. SOLPS-ITER simulations show a decrease in the neutral penetration depth with increasing pedestal d...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2021-06-01
|
| Series: | Nuclear Materials and Energy |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179121000557 |
| _version_ | 1819105555417923584 |
|---|---|
| author | R. Reksoatmodjo S. Mordijck J.W. Hughes J.D. Lore X. Bonnin |
| author_facet | R. Reksoatmodjo S. Mordijck J.W. Hughes J.D. Lore X. Bonnin |
| author_sort | R. Reksoatmodjo |
| collection | DOAJ |
| description | SOLPS-ITER modeling of EDA H-mode experiments on Alcator C-Mod find that the electron density pedestal structure is unaffected by increased gas fueling when approaching ITER-like opaqueness conditions. SOLPS-ITER simulations show a decrease in the neutral penetration depth with increasing pedestal density, similar to prior experiments (Hughes et al., 2006). Neutral density and penetration depth vary poloidally, and we show that the highest neutral densities at the separatrix are found closest to the gas puff locations both on the high field side and the low field side. The decrease in the neutral penetration depth with increasing pedestal density, as well as the decrease in the neutral density at the separatrix, are not just limited to the midplane, but persist at every poloidal location. We find, however, that when gas puffs of similar magnitude as those employed in experiments are added, a much larger increase in the electron density is observed over the whole modeled plasma radius. This does suggest that changes in transport will need to be included self-consistently. |
| first_indexed | 2024-12-22T02:24:07Z |
| format | Article |
| id | doaj.art-67ab9aa32a724ff08facb24d0108c1b0 |
| institution | Directory Open Access Journal |
| issn | 2352-1791 |
| language | English |
| last_indexed | 2024-12-22T02:24:07Z |
| publishDate | 2021-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Materials and Energy |
| spelling | doaj.art-67ab9aa32a724ff08facb24d0108c1b02022-12-21T18:42:03ZengElsevierNuclear Materials and Energy2352-17912021-06-0127100971The role of edge fueling in determining the pedestal density in high neutral opacity Alcator C-Mod experimentsR. Reksoatmodjo0S. Mordijck1J.W. Hughes2J.D. Lore3X. Bonnin4College of William and Mary, 200 Stadium Dr, Williamsburg, VA 23185, USA; Corresponding author.College of William and Mary, 200 Stadium Dr, Williamsburg, VA 23185, USAMIT Plasma Science and Fusion Center, 175 Albany St, Cambridge, MA 02139, USAOak Ridge National Laboratory, 1 Bethel Valley Rd, Oak Ridge, TN 37830, USAITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St Paul-lez-Durance Cedex, FranceSOLPS-ITER modeling of EDA H-mode experiments on Alcator C-Mod find that the electron density pedestal structure is unaffected by increased gas fueling when approaching ITER-like opaqueness conditions. SOLPS-ITER simulations show a decrease in the neutral penetration depth with increasing pedestal density, similar to prior experiments (Hughes et al., 2006). Neutral density and penetration depth vary poloidally, and we show that the highest neutral densities at the separatrix are found closest to the gas puff locations both on the high field side and the low field side. The decrease in the neutral penetration depth with increasing pedestal density, as well as the decrease in the neutral density at the separatrix, are not just limited to the midplane, but persist at every poloidal location. We find, however, that when gas puffs of similar magnitude as those employed in experiments are added, a much larger increase in the electron density is observed over the whole modeled plasma radius. This does suggest that changes in transport will need to be included self-consistently.http://www.sciencedirect.com/science/article/pii/S2352179121000557 |
| spellingShingle | R. Reksoatmodjo S. Mordijck J.W. Hughes J.D. Lore X. Bonnin The role of edge fueling in determining the pedestal density in high neutral opacity Alcator C-Mod experiments Nuclear Materials and Energy |
| title | The role of edge fueling in determining the pedestal density in high neutral opacity Alcator C-Mod experiments |
| title_full | The role of edge fueling in determining the pedestal density in high neutral opacity Alcator C-Mod experiments |
| title_fullStr | The role of edge fueling in determining the pedestal density in high neutral opacity Alcator C-Mod experiments |
| title_full_unstemmed | The role of edge fueling in determining the pedestal density in high neutral opacity Alcator C-Mod experiments |
| title_short | The role of edge fueling in determining the pedestal density in high neutral opacity Alcator C-Mod experiments |
| title_sort | role of edge fueling in determining the pedestal density in high neutral opacity alcator c mod experiments |
| url | http://www.sciencedirect.com/science/article/pii/S2352179121000557 |
| work_keys_str_mv | AT rreksoatmodjo theroleofedgefuelingindeterminingthepedestaldensityinhighneutralopacityalcatorcmodexperiments AT smordijck theroleofedgefuelingindeterminingthepedestaldensityinhighneutralopacityalcatorcmodexperiments AT jwhughes theroleofedgefuelingindeterminingthepedestaldensityinhighneutralopacityalcatorcmodexperiments AT jdlore theroleofedgefuelingindeterminingthepedestaldensityinhighneutralopacityalcatorcmodexperiments AT xbonnin theroleofedgefuelingindeterminingthepedestaldensityinhighneutralopacityalcatorcmodexperiments AT rreksoatmodjo roleofedgefuelingindeterminingthepedestaldensityinhighneutralopacityalcatorcmodexperiments AT smordijck roleofedgefuelingindeterminingthepedestaldensityinhighneutralopacityalcatorcmodexperiments AT jwhughes roleofedgefuelingindeterminingthepedestaldensityinhighneutralopacityalcatorcmodexperiments AT jdlore roleofedgefuelingindeterminingthepedestaldensityinhighneutralopacityalcatorcmodexperiments AT xbonnin roleofedgefuelingindeterminingthepedestaldensityinhighneutralopacityalcatorcmodexperiments |