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Title: Public Data Set: H-mode Plasmas at Very Low Aspect Ratio on the Pegasus Toroidal Experiment

Abstract

This data set contains openly-documented, machine readable digital research data corresponding to figures published in K.E. Thome et al., 'H-mode Plasmas at Very Low Aspect Ratio on the Pegasus Toroidal Experiment,' Nucl. Fusion 57, 022018 (2017).

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]
  1. University of Wisconsin-Madison; Oak Ridge Associated Universities
  2. University of Wisconsin-Madison
Publication Date:
Research Org.:
University of Wisconsin-Madison
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1236495
Report Number(s):
DS2016-6
DOE Contract Number:
FG02-96ER54375
Resource Type:
Data
Resource Relation:
Related Information: K.E. Thome, et al., H-mode Plasmas at Very Low Aspect Ratio on the Pegasus Toroidal Experiment, Nucl. Fusion 57, 022018 (2017). DOI: 10.1088/0029-5515/57/2/022018
Data Type:
Figures/Plots
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Thome, Kathreen E., Bongard, Michael W., Barr, Jayson L., Bodner, Grant M., Burke, Marcus G., Fonck, Raymond J., Kriete, David M., Perry, Justin M., Reusch, Joshua A., and Schlossberg, David J. Public Data Set: H-mode Plasmas at Very Low Aspect Ratio on the Pegasus Toroidal Experiment. United States: N. p., 2016. Web. doi:10.18138/1236495.
Thome, Kathreen E., Bongard, Michael W., Barr, Jayson L., Bodner, Grant M., Burke, Marcus G., Fonck, Raymond J., Kriete, David M., Perry, Justin M., Reusch, Joshua A., & Schlossberg, David J. Public Data Set: H-mode Plasmas at Very Low Aspect Ratio on the Pegasus Toroidal Experiment. United States. doi:10.18138/1236495.
Thome, Kathreen E., Bongard, Michael W., Barr, Jayson L., Bodner, Grant M., Burke, Marcus G., Fonck, Raymond J., Kriete, David M., Perry, Justin M., Reusch, Joshua A., and Schlossberg, David J. 2016. "Public Data Set: H-mode Plasmas at Very Low Aspect Ratio on the Pegasus Toroidal Experiment". United States. doi:10.18138/1236495. https://www.osti.gov/servlets/purl/1236495.
@article{osti_1236495,
title = {Public Data Set: H-mode Plasmas at Very Low Aspect Ratio on the Pegasus Toroidal Experiment},
author = {Thome, Kathreen E. and Bongard, Michael W. and Barr, Jayson L. and Bodner, Grant M. and Burke, Marcus G. and Fonck, Raymond J. and Kriete, David M. and Perry, Justin M. and Reusch, Joshua A. and Schlossberg, David J.},
abstractNote = {This data set contains openly-documented, machine readable digital research data corresponding to figures published in K.E. Thome et al., 'H-mode Plasmas at Very Low Aspect Ratio on the Pegasus Toroidal Experiment,' Nucl. Fusion 57, 022018 (2017).},
doi = {10.18138/1236495},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 9
}

Dataset:

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  • H-mode is obtained atmore » $$A\sim 1.2$$ in the Pegasus Toroidal Experiment via Ohmic heating, high-field-side fueling, and low edge recycling in both limited and diverted magnetic topologies. These H-mode plasmas show the formation of edge current and pressure pedestals and a doubling of the energy confinement time to $${{H}_{98y,2}}\sim 1$$ . The L–H power threshold $${{P}_{\text{LH}}}$$ increases with density, and there is no $${{P}_{\text{LH}}}$$ minimum observed in the attainable density space. The power threshold is equivalent in limited and diverted plasmas, consistent with the FM3 model. However, the measured $${{P}_{\text{LH}}}$$ is $$\sim 15\,\,\times $$ higher than that predicted by conventional International Tokamak Physics Activity (ITPA) scalings, and $${{P}_{\text{LH}}}/{{P}_{\text{ITPA}08}}$$ increases as $$A\to 1$$ . Small ELMs are present at low input power $${{P}_{\text{IN}}}\sim {{P}_{\text{LH}}}$$ , with toroidal mode number $$n\leqslant 4$$ . At $${{P}_{\text{IN}}}\gg {{P}_{\text{LH}}}$$ , they transition to large ELMs with intermediate 5 < n < 15. The dominant-n component of a large ELM grows exponentially, while other components evolve nonlinearly and can damp prior to the crash. Direct measurements of the current profile in the pedestal region show that both ELM types exhibit a generation of a current-hole, followed by a pedestal recovery. Large ELMs are shown to further expel a current-carrying filament. Small ELM suppression via injection of low levels of helical current into the edge plasma region is also indicated.« less
  • This data set contains openly-documented, machine readable digital research data corresponding to figures published in J.A. Reusch et al., 'Non-inductively Driven Tokamak Plasmas at Near-Unity βt in the Pegasus Toroidal Experiment,' accepted for publication in Physics of Plasmas.
  • This public data set contains openly-documented, machine readable digital research data corresponding to figures published in D.J. Schlossberg et. al., 'A Novel, Cost-Effective, Multi-Point Thomson Scattering System on the Pegasus Toroidal Experiment,' Rev. Sci. Instrum. 87, 11E403 (2016).
  • This data set contains openly-documented, machine readable digital research data corresponding to figures published in M.G. Burke et al., 'Erratum: "Multi-point, high-speed passive ion velocity distribution diagnostic on the Pegasus Toroidal Experiment" [Rev. Sci. Instrum. 83, 10D516 (2012)],' Rev. Sci. Instrum. 87, 079902 (2016).