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Title: Advances in the high bootstrap fraction regime on DIII-D towards the Q = 5 mission of ITER steady state

Abstract

Recent EAST/DIII-D joint experiments on the high poloidal beta $${{\beta}_{\text{P}}}$$ regime in DIII-D have extended operation with internal transport barriers (ITBs) and excellent energy confinement (H 98y2 ~ 1.6) to higher plasma current, for lower q 95 ≤ 7.0, and more balanced neutral beam injection (NBI) (torque injection < 2 Nm), for lower plasma rotation than previous results. Transport analysis and experimental measurements at low toroidal rotation suggest that the E × B shear effect is not key to the ITB formation in these high $${{\beta}_{\text{P}}}$$ discharges. Experiments and TGLF modeling show that the Shafranov shift has a key stabilizing effect on turbulence. Extrapolation of the DIII-D results using a 0D model shows that with the improved confinement, the high bootstrap fraction regime could achieve fusion gain Q = 5 in ITER at $${{\beta}_{\text{N}}}$$ ~ 2.9 and q 95 ~ 7. With the optimization of q(0), the required improved confinement is achievable when using 1.5D TGLF-SAT1 for transport simulations. Furthermore, results reported in this paper suggest that the DIII-D high $${{\beta}_{\text{P}}}$$ scenario could be a candidate for ITER steady state operation.

Authors:
 [1];  [2];  [1];  [1];  [1];  [2];  [1];  [3];  [1];  [4];  [5];  [6];  [1];  [1];  [2];  [1]
  1. Chinese Academy of Science, Hefei (People's Republic of China)
  2. General Atomics, San Diego, CA (United States)
  3. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. Oak Ridge Associated Univ., Oak Ridge, TN (United States)
  6. Univ. of Wisconsin, Madison, WI (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1374829
Grant/Contract Number:  
FC02-04ER54698
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 5; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; high bootstrap fraction; steady state; Shafranov shift

Citation Formats

Qian, Jinping P., Garofalo, Andrea M., Gong, Xianzu Z., Ren, Qilong L., Ding, Siye Y., Solomon, Wayne M., Xu, G. S., Grierson, Brian A., Guo, Wenfeng F., Holcomb, Christopher T., McClenaghan, Joseph T., McKee, George R., Pan, Chengkang K., Huang, Juan, Staebler, Gary M., and Wan, Baonian N. Advances in the high bootstrap fraction regime on DIII-D towards the Q = 5 mission of ITER steady state. United States: N. p., 2017. Web. doi:10.1088/1741-4326/aa626a.
Qian, Jinping P., Garofalo, Andrea M., Gong, Xianzu Z., Ren, Qilong L., Ding, Siye Y., Solomon, Wayne M., Xu, G. S., Grierson, Brian A., Guo, Wenfeng F., Holcomb, Christopher T., McClenaghan, Joseph T., McKee, George R., Pan, Chengkang K., Huang, Juan, Staebler, Gary M., & Wan, Baonian N. Advances in the high bootstrap fraction regime on DIII-D towards the Q = 5 mission of ITER steady state. United States. https://doi.org/10.1088/1741-4326/aa626a
Qian, Jinping P., Garofalo, Andrea M., Gong, Xianzu Z., Ren, Qilong L., Ding, Siye Y., Solomon, Wayne M., Xu, G. S., Grierson, Brian A., Guo, Wenfeng F., Holcomb, Christopher T., McClenaghan, Joseph T., McKee, George R., Pan, Chengkang K., Huang, Juan, Staebler, Gary M., and Wan, Baonian N. Mon . "Advances in the high bootstrap fraction regime on DIII-D towards the Q = 5 mission of ITER steady state". United States. https://doi.org/10.1088/1741-4326/aa626a. https://www.osti.gov/servlets/purl/1374829.
@article{osti_1374829,
title = {Advances in the high bootstrap fraction regime on DIII-D towards the Q = 5 mission of ITER steady state},
author = {Qian, Jinping P. and Garofalo, Andrea M. and Gong, Xianzu Z. and Ren, Qilong L. and Ding, Siye Y. and Solomon, Wayne M. and Xu, G. S. and Grierson, Brian A. and Guo, Wenfeng F. and Holcomb, Christopher T. and McClenaghan, Joseph T. and McKee, George R. and Pan, Chengkang K. and Huang, Juan and Staebler, Gary M. and Wan, Baonian N.},
abstractNote = {Recent EAST/DIII-D joint experiments on the high poloidal beta ${{\beta}_{\text{P}}}$ regime in DIII-D have extended operation with internal transport barriers (ITBs) and excellent energy confinement (H 98y2 ~ 1.6) to higher plasma current, for lower q 95 ≤ 7.0, and more balanced neutral beam injection (NBI) (torque injection < 2 Nm), for lower plasma rotation than previous results. Transport analysis and experimental measurements at low toroidal rotation suggest that the E × B shear effect is not key to the ITB formation in these high ${{\beta}_{\text{P}}}$ discharges. Experiments and TGLF modeling show that the Shafranov shift has a key stabilizing effect on turbulence. Extrapolation of the DIII-D results using a 0D model shows that with the improved confinement, the high bootstrap fraction regime could achieve fusion gain Q = 5 in ITER at ${{\beta}_{\text{N}}}$ ~ 2.9 and q 95 ~ 7. With the optimization of q(0), the required improved confinement is achievable when using 1.5D TGLF-SAT1 for transport simulations. Furthermore, results reported in this paper suggest that the DIII-D high ${{\beta}_{\text{P}}}$ scenario could be a candidate for ITER steady state operation.},
doi = {10.1088/1741-4326/aa626a},
url = {https://www.osti.gov/biblio/1374829}, journal = {Nuclear Fusion},
issn = {0029-5515},
number = 5,
volume = 57,
place = {United States},
year = {2017},
month = {3}
}

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Works referenced in this record:

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    Integrated modeling of plasma ramp-up in DIII-D ITER-like and high bootstrap current scenario discharges
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    Study of Alfven eigenmodes stability in plasma with multiple NBI driven energetic particle species
    journal, June 2019