Integrated modeling of high βn steady state scenario on DIII-D

J. M. Park; J. R. Ferron; C. T. Holcomb; R. J. Buttery; W. M. Solomon; D. B. Batchelor; W. Elwasif; D. L. Green; K. Kim; O. Meneghini; M. Murakami; P. B. Snyder

doi:10.1063/1.5013021

Integrated modeling of high β_n steady state scenario on DIII-D

J. M. Park, J. R. Ferron, C. T. Holcomb, R. J. Buttery, W. M. Solomon, D. B. Batchelor, W. Elwasif, D. L. Green, K. Kim, O. Meneghini, M. Murakami, P. B. Snyder

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32 Scopus citations

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.

Original language	English
Article number	012506
Journal	Physics of Plasmas
Volume	25
Issue number	1
DOIs	https://doi.org/10.1063/1.5013021
State	Published - Jan 1 2018

Funding

This work is based upon work supported by the U.S. DOE, Office of Science, Office of Fusion Energy Sciences, using the DIII-D National Fusion Facility, a DOE Office of Science user facility, under Award Nos. DE-AC05-00OR22725, DE-FC02-04ER54698, DE-AC52-07NA27344, DE-FG02-95ER54309, and DE-SC0012656. This research used resources of the National Energy Research Scientific Computing Center (NERSC), a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.

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title = "Integrated modeling of high βn 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 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.",

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AU - Park, J. M.

AU - Ferron, J. R.

AU - Holcomb, C. T.

AU - Buttery, R. J.

AU - Solomon, W. M.

AU - Batchelor, D. B.

AU - Elwasif, W.

AU - Green, D. L.

AU - Kim, K.

AU - Meneghini, O.

AU - Murakami, M.

AU - Snyder, P. B.

PY - 2018/1/1

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N2 - 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.

AB - 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.

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Integrated modeling of high β_n steady state scenario on DIII-D

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