3D field phase-space control in tokamak plasmas
Abstract
Here, a small relaxation of the axisymmetric magnetic field of a tokamak into a non-axisymmetric three-dimensional (3D) configuration can be effective to control magnetohydrodynamic instabilities, such as edge-localized modes. However, a major challenge to the concept of 3D tokamaks is that there are virtually unlimited possible choices for a 3D magnetic field, and most of them will only destabilize or degrade plasmas by symmetry breaking. Here, we demonstrate the phase-space visualization of the full 3D field-operating windows of a tokamak, which allows us to predict which configurations will maintain high confinement without magnetohydrodynamic instabilities in an entire region of plasmas. We test our approach at the Korean Superconducting Tokamak Advanced Research (KSTAR) facility, whose 3D coils with many degrees of freedom in the coil space make it unique for this purpose. Our experiments show that only a small subset of coil configurations can accomplish edge-localized mode suppression without terminating the discharge with core magnetohydrodynamic instabilities, as predicted by the perturbative 3D expansion of plasma equilibrium and the optimizing principle of local resonance. The prediction provided excellent guidance, implying that our method can substantially improve the efficiency and fidelity of the 3D optimization process in tokamaks.
- Authors:
-
[1];
[2];
[2];
[1]
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- National Fusion Research Institute, Daejeon (South Korea)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1485109
- Grant/Contract Number:
- AC02-09CH11466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Physics
- Additional Journal Information:
- Journal Volume: 14; Journal Issue: 12; Journal ID: ISSN 1745-2473
- Publisher:
- Nature Publishing Group (NPG)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Park, Jong -Kyu, Jeon, YoungMu, In, Yongkyoon, Ahn, Joon -Wook, Nazikian, Raffi, Park, Gunyoung, Kim, Jaehyun, Lee, HyungHo, Ko, WonHa, Kim, Hyun -Seok, Logan, Nikolas C., Wang, Zhirui, Feibush, Eliot A., Menard, Jonathan E., and Zarnstroff, Michael C. 3D field phase-space control in tokamak plasmas. United States: N. p., 2018.
Web. doi:10.1038/s41567-018-0268-8.
Park, Jong -Kyu, Jeon, YoungMu, In, Yongkyoon, Ahn, Joon -Wook, Nazikian, Raffi, Park, Gunyoung, Kim, Jaehyun, Lee, HyungHo, Ko, WonHa, Kim, Hyun -Seok, Logan, Nikolas C., Wang, Zhirui, Feibush, Eliot A., Menard, Jonathan E., & Zarnstroff, Michael C. 3D field phase-space control in tokamak plasmas. United States. https://doi.org/10.1038/s41567-018-0268-8
Park, Jong -Kyu, Jeon, YoungMu, In, Yongkyoon, Ahn, Joon -Wook, Nazikian, Raffi, Park, Gunyoung, Kim, Jaehyun, Lee, HyungHo, Ko, WonHa, Kim, Hyun -Seok, Logan, Nikolas C., Wang, Zhirui, Feibush, Eliot A., Menard, Jonathan E., and Zarnstroff, Michael C. Mon .
"3D field phase-space control in tokamak plasmas". United States. https://doi.org/10.1038/s41567-018-0268-8. https://www.osti.gov/servlets/purl/1485109.
@article{osti_1485109,
title = {3D field phase-space control in tokamak plasmas},
author = {Park, Jong -Kyu and Jeon, YoungMu and In, Yongkyoon and Ahn, Joon -Wook and Nazikian, Raffi and Park, Gunyoung and Kim, Jaehyun and Lee, HyungHo and Ko, WonHa and Kim, Hyun -Seok and Logan, Nikolas C. and Wang, Zhirui and Feibush, Eliot A. and Menard, Jonathan E. and Zarnstroff, Michael C.},
abstractNote = {Here, a small relaxation of the axisymmetric magnetic field of a tokamak into a non-axisymmetric three-dimensional (3D) configuration can be effective to control magnetohydrodynamic instabilities, such as edge-localized modes. However, a major challenge to the concept of 3D tokamaks is that there are virtually unlimited possible choices for a 3D magnetic field, and most of them will only destabilize or degrade plasmas by symmetry breaking. Here, we demonstrate the phase-space visualization of the full 3D field-operating windows of a tokamak, which allows us to predict which configurations will maintain high confinement without magnetohydrodynamic instabilities in an entire region of plasmas. We test our approach at the Korean Superconducting Tokamak Advanced Research (KSTAR) facility, whose 3D coils with many degrees of freedom in the coil space make it unique for this purpose. Our experiments show that only a small subset of coil configurations can accomplish edge-localized mode suppression without terminating the discharge with core magnetohydrodynamic instabilities, as predicted by the perturbative 3D expansion of plasma equilibrium and the optimizing principle of local resonance. The prediction provided excellent guidance, implying that our method can substantially improve the efficiency and fidelity of the 3D optimization process in tokamaks.},
doi = {10.1038/s41567-018-0268-8},
journal = {Nature Physics},
number = 12,
volume = 14,
place = {United States},
year = {Mon Sep 10 00:00:00 EDT 2018},
month = {Mon Sep 10 00:00:00 EDT 2018}
}
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