Transport modeling of the DIII-D high ${{\beta}_{p}}$ scenario and extrapolations to ITER steady-state operation

McClenaghan, Joseph; Garofalo, Andrea M.; Meneghini, Orso; Smith, Sterling P.; Leuer, James A.; Staebler, Gary M.; Lao, Lang L.; Park, Jin Myung; Ding, Siye Y.; Gong, Xianzu; Qian, Jinping

doi:10.1088/1741-4326/aa79ca

Transport modeling of the DIII-D high $${{\beta}_{p}}$$ scenario and extrapolations to ITER steady-state operation

Journal Article · Thu Aug 03 00:00:00 EDT 2017 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aa79ca· OSTI ID:1374040

^[1]; Garofalo, Andrea M. ^[2]; Meneghini, Orso ^[2]; Smith, Sterling P. ^[2]; Leuer, James A. ^[2]; Staebler, Gary M. ^[2]; Lao, Lang L. ^[2]; Park, Jin Myung ^[3]; ^[4]; Gong, Xianzu ^[4]; Qian, Jinping ^[4]

Oak Ridge Associated Univ., Oak Ridge, TN (United States); General Atomics
General Atomics, San Diego, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Chinese Academy of Sciences, Hefei (People's Republic of China)

In this study, transport modeling of a proposed ITER steady-state scenario based on DIII-D high poloidal-beta ($${{\beta}_{p}}$$ ) discharges finds that ITB formation can occur with either sufficient rotation or a negative central shear q-profile. The high $${{\beta}_{p}}$$ scenario is characterized by a large bootstrap current fraction (80%) which reduces the demands on the external current drive, and a large radius internal transport barrier which is associated with excellent normalized confinement. Modeling predictions of the electron transport in the high $${{\beta}_{p}}$$ scenario improve as $${{q}_{95}}$$ approaches levels similar to typical existing models of ITER steady-state and the ion transport is turbulence dominated. Typical temperature and density profiles from the non-inductive high $${{\beta}_{p}}$$ scenario on DIII-D are scaled according to 0D modeling predictions of the requirements for achieving a $Q=5$ steady-state fusion gain in ITER with 'day one' heating and current drive capabilities. Then, TGLF turbulence modeling is carried out under systematic variations of the toroidal rotation and the core q-profile. A high bootstrap fraction, high $${{\beta}_{p}}$$ scenario is found to be near an ITB formation threshold, and either strong negative central magnetic shear or rotation in a high bootstrap fraction are found to successfully provide the turbulence suppression required to achieve $Q=5$.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FC02-04ER54698

OSTI ID:: 1374040

Alternate ID(s):: OSTI ID: 22925918

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 11 Vol. 57; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Role of Microtearing Turbulence in DIII-D High Bootstrap Current Fraction Plasmas Jian, X.; Holland, C.; Candy, J. Physical Review Letters, Vol. 123, Issue 22 https://doi.org/10.1103/physrevlett.123.225002	journal	November 2019

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Transport modeling of the DIII-D high $${{\beta}_{p}}$$ scenario and extrapolations to ITER steady-state operation

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