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Title: Test of bootstrap current models using high- β p EAST-demonstration plasmas on DIII-D

Abstract

Magnetic measurements together with kinetic profile and motional Stark effect measurements are used in full kinetic equilibrium reconstructions to test the Sauter and NEO bootstrap current models in a DIII-D high-$${{\beta}_{\text{p}}}$$ EAST-demonstration experiment. This aims at developing on DIII-D a high bootstrap current scenario to be extended on EAST for a demonstration of true steady-state at high performance and uses EAST-similar operational conditions: plasma shape, plasma current, toroidal magnetic field, total heating power and current ramp-up rate. It is found that the large edge bootstrap current in these high-$${{\beta}_{\text{p}}}$$ plasmas allows the use of magnetic measurements to clearly distinguish the two bootstrap current models. In these high collisionality and high-$${{\beta}_{\text{p}}}$$ plasmas, the Sauter model overpredicts the peak of the edge current density by about 30%, while the first-principle kinetic NEO model is in close agreement with the edge current density of the reconstructed equilibrium. Furthermore, these results are consistent with recent work showing that the Sauter model largely overestimates the edge bootstrap current at high collisionality.

Authors:
 [1];  [2];  [2];  [3];  [4];  [2];  [2];  [2];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Chinese Academy of Sciences, Hefei (People's Republic of China)
  2. General Atomics, San Diego, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1367537
Grant/Contract Number:  
FC02-04ER54698; FG02-95ER54309; AC52-07NA27344; AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 2; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; high poloidal beta; kinetic equilibrium reconstruction; bootstrap current

Citation Formats

Ren, Qilong, Lao, Lang L., Garofalo, Andrea M., Holcomb, Christopher T., Solomon, Wayne M., Belli, Emily A., Smith, Sterling P., Meneghini, Orso, Qian, Jinping, Li, Guoaqiang, Wan, Boanian, Ding, Siye, Gong, Xianzu, and Xu, G. Test of bootstrap current models using high-βp EAST-demonstration plasmas on DIII-D. United States: N. p., 2015. Web. doi:10.1088/0741-3335/57/2/025020.
Ren, Qilong, Lao, Lang L., Garofalo, Andrea M., Holcomb, Christopher T., Solomon, Wayne M., Belli, Emily A., Smith, Sterling P., Meneghini, Orso, Qian, Jinping, Li, Guoaqiang, Wan, Boanian, Ding, Siye, Gong, Xianzu, & Xu, G. Test of bootstrap current models using high-βp EAST-demonstration plasmas on DIII-D. United States. doi:10.1088/0741-3335/57/2/025020.
Ren, Qilong, Lao, Lang L., Garofalo, Andrea M., Holcomb, Christopher T., Solomon, Wayne M., Belli, Emily A., Smith, Sterling P., Meneghini, Orso, Qian, Jinping, Li, Guoaqiang, Wan, Boanian, Ding, Siye, Gong, Xianzu, and Xu, G. Mon . "Test of bootstrap current models using high-βp EAST-demonstration plasmas on DIII-D". United States. doi:10.1088/0741-3335/57/2/025020. https://www.osti.gov/servlets/purl/1367537.
@article{osti_1367537,
title = {Test of bootstrap current models using high-βp EAST-demonstration plasmas on DIII-D},
author = {Ren, Qilong and Lao, Lang L. and Garofalo, Andrea M. and Holcomb, Christopher T. and Solomon, Wayne M. and Belli, Emily A. and Smith, Sterling P. and Meneghini, Orso and Qian, Jinping and Li, Guoaqiang and Wan, Boanian and Ding, Siye and Gong, Xianzu and Xu, G.},
abstractNote = {Magnetic measurements together with kinetic profile and motional Stark effect measurements are used in full kinetic equilibrium reconstructions to test the Sauter and NEO bootstrap current models in a DIII-D high-${{\beta}_{\text{p}}}$ EAST-demonstration experiment. This aims at developing on DIII-D a high bootstrap current scenario to be extended on EAST for a demonstration of true steady-state at high performance and uses EAST-similar operational conditions: plasma shape, plasma current, toroidal magnetic field, total heating power and current ramp-up rate. It is found that the large edge bootstrap current in these high-${{\beta}_{\text{p}}}$ plasmas allows the use of magnetic measurements to clearly distinguish the two bootstrap current models. In these high collisionality and high-${{\beta}_{\text{p}}}$ plasmas, the Sauter model overpredicts the peak of the edge current density by about 30%, while the first-principle kinetic NEO model is in close agreement with the edge current density of the reconstructed equilibrium. Furthermore, these results are consistent with recent work showing that the Sauter model largely overestimates the edge bootstrap current at high collisionality.},
doi = {10.1088/0741-3335/57/2/025020},
journal = {Plasma Physics and Controlled Fusion},
number = 2,
volume = 57,
place = {United States},
year = {2015},
month = {1}
}

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