Tearing stable stationary ITER baseline operation in DIII-D
We present a tearing stable, stationary and reproducible operating solution for DIII-D plasmas characterized by the ITER baseline scenario normalized parameter set and shape. In these plasmas low differential rotation ( $\Delta f_{1,2}$ ) between the core and edge is identified as the single root ca...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | Nuclear Fusion |
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| Online Access: | https://doi.org/10.1088/1741-4326/ad9ec3 |
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| author | L. Bardóczi A. Dudkovskaia N.C. Logan N.J. Richner A.C. Brown J.D. Callen R.J. La Haye E.J. Strait |
| author_facet | L. Bardóczi A. Dudkovskaia N.C. Logan N.J. Richner A.C. Brown J.D. Callen R.J. La Haye E.J. Strait |
| author_sort | L. Bardóczi |
| collection | DOAJ |
| description | We present a tearing stable, stationary and reproducible operating solution for DIII-D plasmas characterized by the ITER baseline scenario normalized parameter set and shape. In these plasmas low differential rotation ( $\Delta f_{1,2}$ ) between the core and edge is identified as the single root cause of the onset of the primary limiting instability, the 2,1 Neoclassical Tearing Mode (NTM), while a group of other examined parameters have a much weaker impact on the stability. Explanation is offered by drift kinetic simulations, which show a six-fold reduction in the NTM onset threshold due to diminished stabilizing ion polarization currents when the seed island drift frequency ceases in the local plasma frame. Based on the experimental observation and the explanation provided by the theory, a new discharge program is developed to sustain $\Delta f_{1,2}$ by modifying the edge neoclassical potential through neutral gas fueling. This method enables stationary ITER baseline operation free of disruptive 2,1 tearing modes. |
| format | Article |
| id | doaj-art-cb902500c0ae40548f72883ce6e065c0 |
| institution | Kabale University |
| issn | 0029-5515 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Nuclear Fusion |
| spelling | doaj-art-cb902500c0ae40548f72883ce6e065c02025-01-27T10:46:10ZengIOP PublishingNuclear Fusion0029-55152025-01-0165202604910.1088/1741-4326/ad9ec3Tearing stable stationary ITER baseline operation in DIII-DL. Bardóczi0https://orcid.org/0000-0002-8280-2423A. Dudkovskaia1https://orcid.org/0000-0001-6890-3079N.C. Logan2https://orcid.org/0000-0002-3268-7359N.J. Richner3https://orcid.org/0000-0001-5544-3915A.C. Brown4J.D. Callen5R.J. La Haye6E.J. Strait7https://orcid.org/0000-0001-9215-3757University of California , Irvine, CA 92697, United States of America; General Atomics , PO Box 85608 San Diego, CA 92186-5608, United States of AmericaYork Plasma Institute, School of Physics, Engineering and Technology, University of York , Heslington YO10 5DD, YorkColumbia University , New York, NY 10027, United States of AmericaGeneral Atomics , PO Box 85608 San Diego, CA 92186-5608, United States of AmericaUniversity of California , Irvine, CA 92697, United States of AmericaUniversity of Wisconsin-Madison , Madison, WI 53706-1609, United States of AmericaGeneral Atomics , PO Box 85608 San Diego, CA 92186-5608, United States of AmericaGeneral Atomics , PO Box 85608 San Diego, CA 92186-5608, United States of AmericaWe present a tearing stable, stationary and reproducible operating solution for DIII-D plasmas characterized by the ITER baseline scenario normalized parameter set and shape. In these plasmas low differential rotation ( $\Delta f_{1,2}$ ) between the core and edge is identified as the single root cause of the onset of the primary limiting instability, the 2,1 Neoclassical Tearing Mode (NTM), while a group of other examined parameters have a much weaker impact on the stability. Explanation is offered by drift kinetic simulations, which show a six-fold reduction in the NTM onset threshold due to diminished stabilizing ion polarization currents when the seed island drift frequency ceases in the local plasma frame. Based on the experimental observation and the explanation provided by the theory, a new discharge program is developed to sustain $\Delta f_{1,2}$ by modifying the edge neoclassical potential through neutral gas fueling. This method enables stationary ITER baseline operation free of disruptive 2,1 tearing modes.https://doi.org/10.1088/1741-4326/ad9ec3tearingtokamakstabilitymagnetic island |
| spellingShingle | L. Bardóczi A. Dudkovskaia N.C. Logan N.J. Richner A.C. Brown J.D. Callen R.J. La Haye E.J. Strait Tearing stable stationary ITER baseline operation in DIII-D Nuclear Fusion tearing tokamak stability magnetic island |
| title | Tearing stable stationary ITER baseline operation in DIII-D |
| title_full | Tearing stable stationary ITER baseline operation in DIII-D |
| title_fullStr | Tearing stable stationary ITER baseline operation in DIII-D |
| title_full_unstemmed | Tearing stable stationary ITER baseline operation in DIII-D |
| title_short | Tearing stable stationary ITER baseline operation in DIII-D |
| title_sort | tearing stable stationary iter baseline operation in diii d |
| topic | tearing tokamak stability magnetic island |
| url | https://doi.org/10.1088/1741-4326/ad9ec3 |
| work_keys_str_mv | AT lbardoczi tearingstablestationaryiterbaselineoperationindiiid AT adudkovskaia tearingstablestationaryiterbaselineoperationindiiid AT nclogan tearingstablestationaryiterbaselineoperationindiiid AT njrichner tearingstablestationaryiterbaselineoperationindiiid AT acbrown tearingstablestationaryiterbaselineoperationindiiid AT jdcallen tearingstablestationaryiterbaselineoperationindiiid AT rjlahaye tearingstablestationaryiterbaselineoperationindiiid AT ejstrait tearingstablestationaryiterbaselineoperationindiiid |