Fast low-to-high confinement mode bifurcation dynamics in a tokamak edge plasma gyrokinetic simulation
Abstract
Transport barrier formation and its relation to sheared flows in fluids and plasmas are of fundamental interest in various natural and laboratory observations and of critical importance in achieving an economical energy production in a magnetic fusion device. Here we report the first observation of an edge transport barrier formation event in an electrostatic gyrokinetic simulation carried out in a realistic diverted tokamak edge geometry under strong forcing by a high rate of heat deposition. Here, the results show that turbulent Reynolds-stress-driven sheared E x B flows act in concert with neoclassical orbit loss to quench turbulent transport and form a transport barrier just inside the last closed magnetic flux surface.
- Authors:
-
[1];
[1];
[1];
[1];
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Univ. of California, San Diego, CA (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
- OSTI Identifier:
- 1357604
- Alternate Identifier(s):
- OSTI ID: 1353139
- Grant/Contract Number:
- AC02-09CH11466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 118; Journal Issue: 17; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; geodesic acoustic modes; radial electric-field; zonal flows; turbulence; transport
Citation Formats
Chang, C. S., Ku, S., Tynan, G. R., Hager, R., Churchill, R. M., Cziegler, I., Greenwald, M., Hubbard, A. E., and Hughes, J. W. Fast low-to-high confinement mode bifurcation dynamics in a tokamak edge plasma gyrokinetic simulation. United States: N. p., 2017.
Web. doi:10.1103/PhysRevLett.118.175001.
Chang, C. S., Ku, S., Tynan, G. R., Hager, R., Churchill, R. M., Cziegler, I., Greenwald, M., Hubbard, A. E., & Hughes, J. W. Fast low-to-high confinement mode bifurcation dynamics in a tokamak edge plasma gyrokinetic simulation. United States. https://doi.org/10.1103/PhysRevLett.118.175001
Chang, C. S., Ku, S., Tynan, G. R., Hager, R., Churchill, R. M., Cziegler, I., Greenwald, M., Hubbard, A. E., and Hughes, J. W. Tue .
"Fast low-to-high confinement mode bifurcation dynamics in a tokamak edge plasma gyrokinetic simulation". United States. https://doi.org/10.1103/PhysRevLett.118.175001. https://www.osti.gov/servlets/purl/1357604.
@article{osti_1357604,
title = {Fast low-to-high confinement mode bifurcation dynamics in a tokamak edge plasma gyrokinetic simulation},
author = {Chang, C. S. and Ku, S. and Tynan, G. R. and Hager, R. and Churchill, R. M. and Cziegler, I. and Greenwald, M. and Hubbard, A. E. and Hughes, J. W.},
abstractNote = {Transport barrier formation and its relation to sheared flows in fluids and plasmas are of fundamental interest in various natural and laboratory observations and of critical importance in achieving an economical energy production in a magnetic fusion device. Here we report the first observation of an edge transport barrier formation event in an electrostatic gyrokinetic simulation carried out in a realistic diverted tokamak edge geometry under strong forcing by a high rate of heat deposition. Here, the results show that turbulent Reynolds-stress-driven sheared E x B flows act in concert with neoclassical orbit loss to quench turbulent transport and form a transport barrier just inside the last closed magnetic flux surface.},
doi = {10.1103/PhysRevLett.118.175001},
journal = {Physical Review Letters},
number = 17,
volume = 118,
place = {United States},
year = {Tue Apr 25 00:00:00 EDT 2017},
month = {Tue Apr 25 00:00:00 EDT 2017}
}
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