Modeling a divertor with mid-leg pumping for high-power H-mode scenarios in DIII-D considering E × B drift flows
Edge-plasma simulations of a baffled, long-legged divertor in DIII-D, performed using the multi-fluid code UEDGE, indicate that the position of the detachment front is constrained to the location of the pump duct along the low-field side (LFS) baffle. Simulations including magnetic and E×B drifts we...
Saved in:
| Main Authors: | , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-12-01
|
| Series: | Nuclear Materials and Energy |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179124002059 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850053415119355904 |
|---|---|
| author | Andreas Holm Robert S. Wilcox Jonathan H. Yu Thomas D. Rognlien Marvin E. Rensink Filippo Scotti Roberto Maurizio Steve L. Allen Wilkie Choi Anothony W. Leonard Morgan W. Shafer Mathias Groth Adam McLean |
| author_facet | Andreas Holm Robert S. Wilcox Jonathan H. Yu Thomas D. Rognlien Marvin E. Rensink Filippo Scotti Roberto Maurizio Steve L. Allen Wilkie Choi Anothony W. Leonard Morgan W. Shafer Mathias Groth Adam McLean |
| author_sort | Andreas Holm |
| collection | DOAJ |
| description | Edge-plasma simulations of a baffled, long-legged divertor in DIII-D, performed using the multi-fluid code UEDGE, indicate that the position of the detachment front is constrained to the location of the pump duct along the low-field side (LFS) baffle. Simulations including magnetic and E×B drifts were performed for 12.5 MW deuterium plasmas including intrinsic carbon and seeded neon to assess the optimal location of the LFS divertor pump to create a stable detachment front between the target and the X-point. The radiation front position in the simulations, taken to be indicative of the detachment front, can be controlled between the pump and X-point in the favorable magnetic field direction for H-mode access by moving the pump duct location upstream of the target along the LFS baffle. In the unfavorable magnetic field direction, the radial Eθ×B drift flows are directed towards the pumping surface, efficiently removing the injected deuterium gas and limiting the sensitivity of the radiation front location to the gas injection rate. The role of pumping rate and drift direction on the pumping efficiency are also found to affect the divertor plasma conditions and detachment front location in UEDGE simulations. |
| format | Article |
| id | doaj-art-9e8b020cd5d64ef69e23e65b81cd9c66 |
| institution | DOAJ |
| issn | 2352-1791 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Materials and Energy |
| spelling | doaj-art-9e8b020cd5d64ef69e23e65b81cd9c662025-08-20T02:52:31ZengElsevierNuclear Materials and Energy2352-17912024-12-014110178210.1016/j.nme.2024.101782Modeling a divertor with mid-leg pumping for high-power H-mode scenarios in DIII-D considering E × B drift flowsAndreas Holm0Robert S. Wilcox1Jonathan H. Yu2Thomas D. Rognlien3Marvin E. Rensink4Filippo Scotti5Roberto Maurizio6Steve L. Allen7Wilkie Choi8Anothony W. Leonard9Morgan W. Shafer10Mathias Groth11Adam McLean12Lawrence Livermore National Laboratory, Livermore, CA, USA; Corresponding author.Oak Ridge National Laboratory, Oak Ridge, TN, USAGeneral Atomics, San Diego, CA, USALawrence Livermore National Laboratory, Livermore, CA, USALawrence Livermore National Laboratory, Livermore, CA, USALawrence Livermore National Laboratory, Livermore, CA, USAGeneral Atomics, San Diego, CA, USALawrence Livermore National Laboratory, Livermore, CA, USAGeneral Atomics, San Diego, CA, USAGeneral Atomics, San Diego, CA, USAOak Ridge National Laboratory, Oak Ridge, TN, USAAalto University, Espoo, FinlandLawrence Livermore National Laboratory, Livermore, CA, USAEdge-plasma simulations of a baffled, long-legged divertor in DIII-D, performed using the multi-fluid code UEDGE, indicate that the position of the detachment front is constrained to the location of the pump duct along the low-field side (LFS) baffle. Simulations including magnetic and E×B drifts were performed for 12.5 MW deuterium plasmas including intrinsic carbon and seeded neon to assess the optimal location of the LFS divertor pump to create a stable detachment front between the target and the X-point. The radiation front position in the simulations, taken to be indicative of the detachment front, can be controlled between the pump and X-point in the favorable magnetic field direction for H-mode access by moving the pump duct location upstream of the target along the LFS baffle. In the unfavorable magnetic field direction, the radial Eθ×B drift flows are directed towards the pumping surface, efficiently removing the injected deuterium gas and limiting the sensitivity of the radiation front location to the gas injection rate. The role of pumping rate and drift direction on the pumping efficiency are also found to affect the divertor plasma conditions and detachment front location in UEDGE simulations.http://www.sciencedirect.com/science/article/pii/S2352179124002059DIII-DUEDGEMid-leg pumpingPlasma drifts |
| spellingShingle | Andreas Holm Robert S. Wilcox Jonathan H. Yu Thomas D. Rognlien Marvin E. Rensink Filippo Scotti Roberto Maurizio Steve L. Allen Wilkie Choi Anothony W. Leonard Morgan W. Shafer Mathias Groth Adam McLean Modeling a divertor with mid-leg pumping for high-power H-mode scenarios in DIII-D considering E × B drift flows Nuclear Materials and Energy DIII-D UEDGE Mid-leg pumping Plasma drifts |
| title | Modeling a divertor with mid-leg pumping for high-power H-mode scenarios in DIII-D considering E × B drift flows |
| title_full | Modeling a divertor with mid-leg pumping for high-power H-mode scenarios in DIII-D considering E × B drift flows |
| title_fullStr | Modeling a divertor with mid-leg pumping for high-power H-mode scenarios in DIII-D considering E × B drift flows |
| title_full_unstemmed | Modeling a divertor with mid-leg pumping for high-power H-mode scenarios in DIII-D considering E × B drift flows |
| title_short | Modeling a divertor with mid-leg pumping for high-power H-mode scenarios in DIII-D considering E × B drift flows |
| title_sort | modeling a divertor with mid leg pumping for high power h mode scenarios in diii d considering e b drift flows |
| topic | DIII-D UEDGE Mid-leg pumping Plasma drifts |
| url | http://www.sciencedirect.com/science/article/pii/S2352179124002059 |
| work_keys_str_mv | AT andreasholm modelingadivertorwithmidlegpumpingforhighpowerhmodescenariosindiiidconsideringebdriftflows AT robertswilcox modelingadivertorwithmidlegpumpingforhighpowerhmodescenariosindiiidconsideringebdriftflows AT jonathanhyu modelingadivertorwithmidlegpumpingforhighpowerhmodescenariosindiiidconsideringebdriftflows AT thomasdrognlien modelingadivertorwithmidlegpumpingforhighpowerhmodescenariosindiiidconsideringebdriftflows AT marvinerensink modelingadivertorwithmidlegpumpingforhighpowerhmodescenariosindiiidconsideringebdriftflows AT filipposcotti modelingadivertorwithmidlegpumpingforhighpowerhmodescenariosindiiidconsideringebdriftflows AT robertomaurizio modelingadivertorwithmidlegpumpingforhighpowerhmodescenariosindiiidconsideringebdriftflows AT stevelallen modelingadivertorwithmidlegpumpingforhighpowerhmodescenariosindiiidconsideringebdriftflows AT wilkiechoi modelingadivertorwithmidlegpumpingforhighpowerhmodescenariosindiiidconsideringebdriftflows AT anothonywleonard modelingadivertorwithmidlegpumpingforhighpowerhmodescenariosindiiidconsideringebdriftflows AT morganwshafer modelingadivertorwithmidlegpumpingforhighpowerhmodescenariosindiiidconsideringebdriftflows AT mathiasgroth modelingadivertorwithmidlegpumpingforhighpowerhmodescenariosindiiidconsideringebdriftflows AT adammclean modelingadivertorwithmidlegpumpingforhighpowerhmodescenariosindiiidconsideringebdriftflows |