Steady state scenario development with elevated minimum safety factor on DIII-D
Abstract
On DIII-D [J.L. Luxon, 2005 Fusion Sci. Tech. 48 828], a high β scenario with minimum safety factor ( qmin ) near 1.4 has been optimized with new tools and shown to be a favorable candidate for long pulse or steady state operation in future devices. The new capability to redirect up to 5 MW of neutral beam injection (NBI) from on- to off-axis improves the ability to sustain elevated qmin with a less peaked pressure profile. These changes increase the ideal MHD n =1 mode βN limit thus providing a path forward for increasing the noninductive current drive fraction by operating at high βN. Quasi-stationary discharges free of tearing modes have been sustained at βN = 3.5 and βT = 3.6% for two current profile diffusion timescales (about 3 seconds) limited by neutral beam duration. The discharge performance has normalized fusion performance expected to give fusion gain Q ≈ 5 in a device the size of ITER. Analysis of the poloidal flux evolution and current drive balance show that the loop voltage profile is almost relaxed even with 25% of the current driven inductively, and qmin remains elevated near 1.4. These observations increase confidence that the current profile willmore »
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- General Atomics, San Diego, CA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Columbia Univ., New York, NY (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- FAR-TECH Inc., San Diego, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1343029
- Alternate Identifier(s):
- OSTI ID: 1352312
- Report Number(s):
- LLNL-JRNL-647501
Journal ID: ISSN 0029-5515
- Grant/Contract Number:
- AC52-07NA27344; FC02-04ER54698; AC05-00OR22725; FG02-04ER54761; AC02-09CH11466; FG02-08ER85195
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 54; Journal Issue: 9; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION; steady state scenarios; high beta; non-inductive current drive; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Holcomb, Christopher T., Ferron, John R., Luce, Timothy C., Petrie, Thomas W., Park, J. M., Turco, Francesco, Van Zeeland, Michael A., Okabayashi, Michio, Lasnier, Charles T., Hanson, Jeremy M., Politzter, P. A., In, Y., Hyatt, A. W., La Haye, R. J., and Lanctot, M. J. Steady state scenario development with elevated minimum safety factor on DIII-D. United States: N. p., 2014.
Web. doi:10.1088/0029-5515/54/9/093009.
Holcomb, Christopher T., Ferron, John R., Luce, Timothy C., Petrie, Thomas W., Park, J. M., Turco, Francesco, Van Zeeland, Michael A., Okabayashi, Michio, Lasnier, Charles T., Hanson, Jeremy M., Politzter, P. A., In, Y., Hyatt, A. W., La Haye, R. J., & Lanctot, M. J. Steady state scenario development with elevated minimum safety factor on DIII-D. United States. https://doi.org/10.1088/0029-5515/54/9/093009
Holcomb, Christopher T., Ferron, John R., Luce, Timothy C., Petrie, Thomas W., Park, J. M., Turco, Francesco, Van Zeeland, Michael A., Okabayashi, Michio, Lasnier, Charles T., Hanson, Jeremy M., Politzter, P. A., In, Y., Hyatt, A. W., La Haye, R. J., and Lanctot, M. J. Fri .
"Steady state scenario development with elevated minimum safety factor on DIII-D". United States. https://doi.org/10.1088/0029-5515/54/9/093009. https://www.osti.gov/servlets/purl/1343029.
@article{osti_1343029,
title = {Steady state scenario development with elevated minimum safety factor on DIII-D},
author = {Holcomb, Christopher T. and Ferron, John R. and Luce, Timothy C. and Petrie, Thomas W. and Park, J. M. and Turco, Francesco and Van Zeeland, Michael A. and Okabayashi, Michio and Lasnier, Charles T. and Hanson, Jeremy M. and Politzter, P. A. and In, Y. and Hyatt, A. W. and La Haye, R. J. and Lanctot, M. J.},
abstractNote = {On DIII-D [J.L. Luxon, 2005 Fusion Sci. Tech. 48 828], a high β scenario with minimum safety factor ( qmin ) near 1.4 has been optimized with new tools and shown to be a favorable candidate for long pulse or steady state operation in future devices. The new capability to redirect up to 5 MW of neutral beam injection (NBI) from on- to off-axis improves the ability to sustain elevated qmin with a less peaked pressure profile. These changes increase the ideal MHD n =1 mode βN limit thus providing a path forward for increasing the noninductive current drive fraction by operating at high βN. Quasi-stationary discharges free of tearing modes have been sustained at βN = 3.5 and βT = 3.6% for two current profile diffusion timescales (about 3 seconds) limited by neutral beam duration. The discharge performance has normalized fusion performance expected to give fusion gain Q ≈ 5 in a device the size of ITER. Analysis of the poloidal flux evolution and current drive balance show that the loop voltage profile is almost relaxed even with 25% of the current driven inductively, and qmin remains elevated near 1.4. These observations increase confidence that the current profile will not evolve to one unstable to a tearing mode. In preliminary tests a divertor heat flux reduction technique based on producing a radiating mantle with neon injection appears compatible with this operating scenario. 0-D model extrapolations suggest it may be possible to push this scenario up to 100% noninductive current drive by raising βN . Similar discharges with qmin =1.5- 2 were susceptible to tearing modes and off-axis fishbones, and with qmin > 2 lower normalized global energy confinement time is observed.},
doi = {10.1088/0029-5515/54/9/093009},
journal = {Nuclear Fusion},
number = 9,
volume = 54,
place = {United States},
year = {Fri Aug 15 00:00:00 EDT 2014},
month = {Fri Aug 15 00:00:00 EDT 2014}
}
Web of Science
Works referenced in this record:
Fusion Nuclear Science Facility-AT: A Material and Component Testing Device
journal, August 2012
- Wong, C. P. C.; Chan, V. S.; Garofalo, A. M.
- Fusion Science and Technology, Vol. 62, Issue 1
Limitations of power conversion systems under transient loads and impact on the pulsed tokamak power reactor
conference, January 1994
- Sager, G. T.; Wong, C. P. C.; Kapich, D. D.
- 15th IEEE/NPSS Symposium. Fusion Engineering
Optimized tokamak power exhaust with double radiative feedback in ASDEX Upgrade
journal, November 2012
- Kallenbach, A.; Bernert, M.; Eich, T.
- Nuclear Fusion, Vol. 52, Issue 12
Measurements and modeling of Alfvén eigenmode induced fast ion transport and loss in DIII-D and ASDEX Upgrade
journal, May 2011
- Van Zeeland, M. A.; Heidbrink, W. W.; Fisher, R. K.
- Physics of Plasmas, Vol. 18, Issue 5
Fast-ion transport induced by Alfvén eigenmodes in the ASDEX Upgrade tokamak
journal, August 2011
- Garcia-Munoz, M.; Classen, I. G. J.; Geiger, B.
- Nuclear Fusion, Vol. 51, Issue 10
Comparison of radiating divertor behaviour in single-null and double-null plasmas in DIII-D
journal, March 2008
- Petrie, T. W.; Brooks, N. H.; Fenstermacher, M. E.
- Nuclear Fusion, Vol. 48, Issue 4
Initial measurements of the DIII-D off-axis neutral beams
journal, September 2012
- Heidbrink, W. W.; Zeeland, M. A. Van; Grierson, B. A.
- Nuclear Fusion, Vol. 52, Issue 9
Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime
journal, July 1999
- Sauter, O.; Angioni, C.; Lin-Liu, Y. R.
- Physics of Plasmas, Vol. 6, Issue 7
Progress toward fully noninductive discharge operation in DIII-D using off-axis neutral beam injection
journal, September 2013
- Ferron, J. R.; Holcomb, C. T.; Luce, T. C.
- Physics of Plasmas, Vol. 20, Issue 9
Power plant conceptual studies in Europe
journal, October 2007
- Maisonnier, D.; Campbell, D.; Cook, I.
- Nuclear Fusion, Vol. 47, Issue 11
Sensitivity of transport and stability to the current profile in steady-state scenario plasmas in DIII-D
journal, December 2012
- Turco, F.; Holcomb, C. T.; Ferron, J. R.
- Physics of Plasmas, Vol. 19, Issue 12
Measurements, modelling and electron cyclotron heating modification of Alfvén eigenmode activity in DIII-D
journal, April 2009
- Van Zeeland, M. A.; Heidbrink, W. W.; Nazikian, R.
- Nuclear Fusion, Vol. 49, Issue 6
Commercial tokamak reactor potential with advanced tokamak operation
journal, May 1995
- Galambos, J. D.; Perkins, L. J.; Haney, S. W.
- Nuclear Fusion, Vol. 35, Issue 5
Optimization of DIII-D advanced tokamak discharges with respect to the β limit
journal, May 2005
- Ferron, J. R.; Casper, T. A.; Doyle, E. J.
- Physics of Plasmas, Vol. 12, Issue 5
Control of the resistive wall mode with internal coils in the DIII–D tokamak
journal, November 2005
- Okabayashi, M.; Bialek, J.; Bondeson, A.
- Nuclear Fusion, Vol. 45, Issue 12
Erratum: “Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime” [Phys. Plasmas 6 , 2834 (1999)]
journal, December 2002
- Sauter, O.; Angioni, C.; Lin-Liu, Y. R.
- Physics of Plasmas, Vol. 9, Issue 12
Electron cyclotron current drive efficiency in general tokamak geometry
journal, October 2003
- Lin-Liu, Y. R.; Chan, V. S.; Prater, R.
- Physics of Plasmas, Vol. 10, Issue 10
Particle distribution modification by low amplitude modes
journal, March 2010
- White, R. B.; Gorelenkov, N.; Heidbrink, W. W.
- Plasma Physics and Controlled Fusion, Vol. 52, Issue 4
Non-inductive current drive and transport in high β N plasmas in JET
journal, April 2009
- Voitsekhovitch, I.; Alper, B.; Brix, M.
- Nuclear Fusion, Vol. 49, Issue 5
Integrated modelling of steady-state scenarios and heating and current drive mixes for ITER
journal, August 2011
- Murakami, M.; Park, J. M.; Giruzzi, G.
- Nuclear Fusion, Vol. 51, Issue 10
Access to sustained high-beta with internal transport barrier and negative central magnetic shear in DIII-D
journal, May 2006
- Garofalo, A. M.; Doyle, E. J.; Ferron, J. R.
- Physics of Plasmas, Vol. 13, Issue 5
Progress toward fully noninductive, high beta conditions in DIII-D
journal, May 2006
- Murakami, M.; Wade, M. R.; Greenfield, C. M.
- Physics of Plasmas, Vol. 13, Issue 5
Excitation of Alfvén eigenmodes by low energy beam ions in the DIII-D and JET tokamaks
journal, May 2008
- Nazikian, R.; Gorelenkov, N. N.; Alper, B.
- Physics of Plasmas, Vol. 15, Issue 5
Chapter 2: Plasma confinement and transport
journal, December 1999
- Transport, ITER Physics Expert Group on Confin; Database, ITER Physics Expert Group on Confin; Editors, ITER Physics Basis
- Nuclear Fusion, Vol. 39, Issue 12
High Beta and Enhanced Confinement in a Second Stable Core VH-Mode Advanced Tokamak
journal, January 1995
- Turnbull, A. D.; Taylor, T. S.; Lin-Liu, Y. R.
- Physical Review Letters, Vol. 74, Issue 5
Development of Steady-State Advanced Tokamak Research in the DIII-D Tokamak
journal, October 2005
- Luce, T. C.
- Fusion Science and Technology, Vol. 48, Issue 2
Kink instabilities in high-beta JET advanced scenarios
journal, January 2012
- Buratti, P.; Baruzzo, M.; Buttery, R. J.
- Nuclear Fusion, Vol. 52, Issue 2
Steady state advanced scenarios at ASDEX Upgrade
journal, November 2002
- Sips, A. C. C.; Arslanbekov, R.; Atanasiu, C.
- Plasma Physics and Controlled Fusion, Vol. 44, Issue 12B
Current relaxation time scales in toroidal plasmas
journal, February 1989
- Mikkelsen, D. R.
- Physics of Fluids B: Plasma Physics, Vol. 1, Issue 2
Off-axis neutral beam current drive for advanced scenario development in DIII-D
journal, May 2009
- Murakami, M.; Park, J. M.; Petty, C. C.
- Nuclear Fusion, Vol. 49, Issue 6
Measurement of the Resistive-Wall-Mode Stability in a Rotating Plasma Using Active MHD Spectroscopy
journal, September 2004
- Reimerdes, H.; Chu, M. S.; Garofalo, A. M.
- Physical Review Letters, Vol. 93, Issue 13
Anomalous Flattening of the Fast-Ion Profile during Alfvén-Eigenmode Activity
journal, December 2007
- Heidbrink, W. W.; Gorelenkov, N. N.; Luo, Y.
- Physical Review Letters, Vol. 99, Issue 24
Basic physics of Alfvén instabilities driven by energetic particles in toroidally confined plasmas
journal, May 2008
- Heidbrink, W. W.
- Physics of Plasmas, Vol. 15, Issue 5
Scalings for tokamak energy confinement
journal, October 1990
- Yushmanov, P. N.; Takizuka, T.; Riedel, K. S.
- Nuclear Fusion, Vol. 30, Issue 10
Development of advanced operation scenarios in weak magnetic-shear regime on JT-60U
journal, July 2009
- Suzuki, T.; Oyama, N.; Isayama, A.
- Nuclear Fusion, Vol. 49, Issue 8
ITER: opportunity of burning plasma studies
journal, November 2001
- Shimomura, Y.; Murakami, Y.; Polevoi, A. R.
- Plasma Physics and Controlled Fusion, Vol. 43, Issue 12A
The tokamak Monte Carlo fast ion module NUBEAM in the National Transport Code Collaboration library
journal, June 2004
- Pankin, Alexei; McCune, Douglas; Andre, Robert
- Computer Physics Communications, Vol. 159, Issue 3
Improved plasma performance in tokamaks with negative magnetic shear
journal, February 1994
- Kessel, C.; Manickam, J.; Rewoldt, G.
- Physical Review Letters, Vol. 72, Issue 8
The ARIES-AT advanced tokamak, Advanced technology fusion power plant
journal, January 2006
- Najmabadi, Farrokh; Abdou, A.; Bromberg, L.
- Fusion Engineering and Design, Vol. 80, Issue 1-4
Optimizing stability, transport, and divertor operation through plasma shaping for steady-state scenario development in DIII-D
journal, May 2009
- Holcomb, C. T.; Ferron, J. R.; Luce, T. C.
- Physics of Plasmas, Vol. 16, Issue 5
Works referencing / citing this record:
Integrated modeling of high β N steady state scenario on DIII-D
journal, January 2018
- Park, J. M.; Ferron, J. R.; Holcomb, C. T.
- Physics of Plasmas, Vol. 25, Issue 1
Feedback control of stored energy and rotation with variable beam energy and perveance on DIII-D
journal, May 2019
- Boyer, M. D.; Erickson, K. G.; Grierson, B. A.
- Nuclear Fusion, Vol. 59, Issue 7