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Title: Integrated modeling of high β N steady state scenario on DIII-D

Abstract

Theory-based integrated modeling validated against DIII-D experiments predicts that fully non-inductive DIII-D operation with β N > 4.5 is possible with certain upgrades. IPS-FASTRAN is a new iterative numerical procedure that integrates models of core transport, edge pedestal, equilibrium, stability, heating, and current drive self-consistently to find steady-state ( d/dt = 0) solutions and reproduces most features of DIII-D high β N discharges with a stationary current profile. Projecting forward to scenarios possible on DIII-D with future upgrades, the high q min > 2 scenario achieves stable operation at β N as high as 5 by using a very broad current density profile to improve the ideal-wall stabilization of low- n instabilities along with confinement enhancement from low magnetic shear. This modeling guides the necessary upgrades of the heating and current drive system to realize reactor-relevant high β N steady-state scenarios on DIII-D by simultaneous optimization of the current and pressure profiles.

Authors:
 [1];  [2];  [3];  [2]; ORCiD logo [2];  [1]; ORCiD logo [1]; ORCiD logo [1];  [4];  [2];  [1];  [2]
  1. Oak Ridge National Lab., Oak Ridge, TN (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Lawrence Livermore National Lab., Livermore, CA (United States)
  4. Seoul National Univ., Seoul (South Korea)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1420378
Alternate Identifier(s):
OSTI ID: 1416464; OSTI ID: 1502048
Report Number(s):
LLNL-JRNL-752091
Journal ID: ISSN 1070-664X; TRN: US1801486
Grant/Contract Number:  
FC02-04ER54698; AC02-05CH11231; AC05-00OR22725; FG02-95ER54309; FG02-95ER54698; AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 1; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Park, Jin Myung, Ferron, J. R., Holcomb, Christopher T., Buttery, Richard J., Solomon, Wayne M., Batchelor, D. B., Elwasif, W., Green, D. L., Kim, K., Meneghini, Orso, Murakami, M., and Snyder, Phil B. Integrated modeling of high βN steady state scenario on DIII-D. United States: N. p., 2018. Web. doi:10.1063/1.5013021.
Park, Jin Myung, Ferron, J. R., Holcomb, Christopher T., Buttery, Richard J., Solomon, Wayne M., Batchelor, D. B., Elwasif, W., Green, D. L., Kim, K., Meneghini, Orso, Murakami, M., & Snyder, Phil B. Integrated modeling of high βN steady state scenario on DIII-D. United States. doi:10.1063/1.5013021.
Park, Jin Myung, Ferron, J. R., Holcomb, Christopher T., Buttery, Richard J., Solomon, Wayne M., Batchelor, D. B., Elwasif, W., Green, D. L., Kim, K., Meneghini, Orso, Murakami, M., and Snyder, Phil B. Wed . "Integrated modeling of high βN steady state scenario on DIII-D". United States. doi:10.1063/1.5013021. https://www.osti.gov/servlets/purl/1420378.
@article{osti_1420378,
title = {Integrated modeling of high βN steady state scenario on DIII-D},
author = {Park, Jin Myung and Ferron, J. R. and Holcomb, Christopher T. and Buttery, Richard J. and Solomon, Wayne M. and Batchelor, D. B. and Elwasif, W. and Green, D. L. and Kim, K. and Meneghini, Orso and Murakami, M. and Snyder, Phil B.},
abstractNote = {Theory-based integrated modeling validated against DIII-D experiments predicts that fully non-inductive DIII-D operation with βN > 4.5 is possible with certain upgrades. IPS-FASTRAN is a new iterative numerical procedure that integrates models of core transport, edge pedestal, equilibrium, stability, heating, and current drive self-consistently to find steady-state (d/dt = 0) solutions and reproduces most features of DIII-D high βN discharges with a stationary current profile. Projecting forward to scenarios possible on DIII-D with future upgrades, the high qmin > 2 scenario achieves stable operation at βN as high as 5 by using a very broad current density profile to improve the ideal-wall stabilization of low-n instabilities along with confinement enhancement from low magnetic shear. This modeling guides the necessary upgrades of the heating and current drive system to realize reactor-relevant high βN steady-state scenarios on DIII-D by simultaneous optimization of the current and pressure profiles.},
doi = {10.1063/1.5013021},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 1,
volume = 25,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
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Cited by: 2 works
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Figures / Tables:

FIG. 1 FIG. 1: Calculated radial profiles (red) compared with experimental measurements (blue): (a) electron density, (b) electron temperature, (c) toroidal plasma rotation, (d) ion temperature, (e) surface-plasma current averaged parallel plasma current density, (g) safety factor. The shade denotes a random error bar for the time-varying experimental profile averaged over 4 < t < 5 sec during stationary highmore » $\beta$$_N$ phase. The calculated profiles are plotted at the end of the 4th (dashed) and 5th (solid) iteration of the steady-state solution procedures. The vertical line shows the location of the pedestal top.« less

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