skip to main content

DOE PAGESDOE PAGES

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

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 $Q=5$.
Authors:
ORCiD logo [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [3] ; ORCiD logo [4] ;  [4] ;  [4]
  1. Oak Ridge Associated Univ., Oak Ridge, TN (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Chinese Academy of Sciences, Hefei (People's Republic of China)
Publication Date:
Grant/Contract Number:
FC02-04ER54698
Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 11; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; steady-state; transport; ITER; DIII-D
OSTI Identifier:
1374040

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, and Qian, Jinping. Transport modeling of the DIII-D high ${{\beta}_{p}}$ scenario and extrapolations to ITER steady-state operation. United States: N. p., Web. doi:10.1088/1741-4326/aa79ca.
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. Transport modeling of the DIII-D high ${{\beta}_{p}}$ scenario and extrapolations to ITER steady-state operation. United States. doi:10.1088/1741-4326/aa79ca.
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, and Qian, Jinping. 2017. "Transport modeling of the DIII-D high ${{\beta}_{p}}$ scenario and extrapolations to ITER steady-state operation". United States. doi:10.1088/1741-4326/aa79ca. https://www.osti.gov/servlets/purl/1374040.
@article{osti_1374040,
title = {Transport modeling of the DIII-D high ${{\beta}_{p}}$ scenario and extrapolations to ITER steady-state operation},
author = {McClenaghan, Joseph and Garofalo, Andrea M. and Meneghini, Orso and Smith, Sterling P. and Leuer, James A. and Staebler, Gary M. and Lao, Lang L. and Park, Jin Myung and Ding, Siye Y. and Gong, Xianzu and Qian, Jinping},
abstractNote = {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 $Q=5$.},
doi = {10.1088/1741-4326/aa79ca},
journal = {Nuclear Fusion},
number = 11,
volume = 57,
place = {United States},
year = {2017},
month = {8}
}