On the stability and stationarity of the Super H-mode combined with an ion transport barrier in the core
Abstract
The Super H-mode, a regime with high pedestal pressure and stored energy, is explored on DIII-D and combined with an ion transport barrier in the plasma core to increase performance. A significant improvement of ion temperatures and confinement is facilitated by favorable conditions such as high rotational shear and high ion pedestal temperatures. As a result of a rise in density and simultaneous decrease in rotation, the ion transport barrier disappears during the discharge evolution, leading to a transition from a very high confinement state at early times, to a reduced but still high confinement phase. Additionally, in many discharges, a global MHD event consistent with the coupling of a destabilized internal mode to an edge localized mode (ELM) causes a large energy loss and leads to a reorganization of the plasma into a lower temperature, higher density state. Depending on the magnitude of the global MHD event, the plasma edge collisionality can increase significantly and shift the operational boundary from the peeling to the ballooning side, which can be understood as a drop out of the Super H-mode channel into standard H-mode. Hence, in Super H-mode discharges with ion transport barriers, both the improved pedestal height and rotational shearmore »
- Authors:
-
[1];
[2];
[2];
[3];
[5];
[2];
- Oak Ridge Associated Univ., Oak Ridge, TN (United States); General Atomics, San Diego, CA (United States)
- General Atomics, San Diego, CA (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Columbia Univ., New York, NY (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of California, San Diego, CA (United States)
- Massachusetts Inst. of Technology (MIT), Boston, MA (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
- OSTI Identifier:
- 1756059
- Alternate Identifier(s):
- OSTI ID: 1755484; OSTI ID: 1820172
- Grant/Contract Number:
- FC02-04ER54698; AC02-09CH11466; SC0018030; AC52-07NA27344; FG02-04ER54761; SC0018287
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Plasma Physics and Controlled Fusion
- Additional Journal Information:
- Journal Volume: 63; Journal Issue: 2; Journal ID: ISSN 0741-3335
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Pedestal; Super H-mode; stability; transients
Citation Formats
Knolker, M., Evans, T. E., Snyder, P. B., Grierson, B., Hanson, J., Jaervinen, A., Jian, X., McClenaghan, J., Osborne, T., Paz-Soldan, C., Solomon, W., and Wilks, T. On the stability and stationarity of the Super H-mode combined with an ion transport barrier in the core. United States: N. p., 2021.
Web. doi:10.1088/1361-6587/abce18.
Knolker, M., Evans, T. E., Snyder, P. B., Grierson, B., Hanson, J., Jaervinen, A., Jian, X., McClenaghan, J., Osborne, T., Paz-Soldan, C., Solomon, W., & Wilks, T. On the stability and stationarity of the Super H-mode combined with an ion transport barrier in the core. United States. https://doi.org/10.1088/1361-6587/abce18
Knolker, M., Evans, T. E., Snyder, P. B., Grierson, B., Hanson, J., Jaervinen, A., Jian, X., McClenaghan, J., Osborne, T., Paz-Soldan, C., Solomon, W., and Wilks, T. Mon .
"On the stability and stationarity of the Super H-mode combined with an ion transport barrier in the core". United States. https://doi.org/10.1088/1361-6587/abce18. https://www.osti.gov/servlets/purl/1756059.
@article{osti_1756059,
title = {On the stability and stationarity of the Super H-mode combined with an ion transport barrier in the core},
author = {Knolker, M. and Evans, T. E. and Snyder, P. B. and Grierson, B. and Hanson, J. and Jaervinen, A. and Jian, X. and McClenaghan, J. and Osborne, T. and Paz-Soldan, C. and Solomon, W. and Wilks, T.},
abstractNote = {The Super H-mode, a regime with high pedestal pressure and stored energy, is explored on DIII-D and combined with an ion transport barrier in the plasma core to increase performance. A significant improvement of ion temperatures and confinement is facilitated by favorable conditions such as high rotational shear and high ion pedestal temperatures. As a result of a rise in density and simultaneous decrease in rotation, the ion transport barrier disappears during the discharge evolution, leading to a transition from a very high confinement state at early times, to a reduced but still high confinement phase. Additionally, in many discharges, a global MHD event consistent with the coupling of a destabilized internal mode to an edge localized mode (ELM) causes a large energy loss and leads to a reorganization of the plasma into a lower temperature, higher density state. Depending on the magnitude of the global MHD event, the plasma edge collisionality can increase significantly and shift the operational boundary from the peeling to the ballooning side, which can be understood as a drop out of the Super H-mode channel into standard H-mode. Hence, in Super H-mode discharges with ion transport barriers, both the improved pedestal height and rotational shear contribute to the high stored energy. Here, at very low levels of rotation, the confinement factor for SH modes is still expected to exceed standard H-mode by 20-30 %. With their overall stationarity and high-performance levels, Super H-mode discharges provide an attractive regime for ITER and may enable a more compact design of future fusion power plants.},
doi = {10.1088/1361-6587/abce18},
journal = {Plasma Physics and Controlled Fusion},
number = 2,
volume = 63,
place = {United States},
year = {Mon Jan 04 00:00:00 EST 2021},
month = {Mon Jan 04 00:00:00 EST 2021}
}
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