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Title: A predictive model for the tokamak density limit

Abstract

We reproduce the Greenwald density limit, in all tokamak experiments by using a phenomenologically correct model with parameters in the range of experiments. A simple model of equilibrium evolution and local power balance inside the island has been implemented to calculate the radiation-driven thermo-resistive tearing mode growth and explain the density limit. Strong destabilization of the tearing mode due to an imbalance of local Ohmic heating and radiative cooling in the island predicts the density limit within a few percent. Furthermore, we found the density limit and it is a local edge limit and weakly dependent on impurity densities. Our results are robust to a substantial variation in model parameters within the range of experiments.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1335462
Alternate Identifier(s):
OSTI ID: 1275971
Grant/Contract Number:
AC02-09CH11466; SC0004125
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 56; Journal Issue: 10; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; density limit; tearing mode; impurity radiation

Citation Formats

Teng, Q., Brennan, D. P., Delgado-Aparicio, L., Gates, D. A., Swerdlow, J., and White, R. B.. A predictive model for the tokamak density limit. United States: N. p., 2016. Web. doi:10.1088/0029-5515/56/10/106001.
Teng, Q., Brennan, D. P., Delgado-Aparicio, L., Gates, D. A., Swerdlow, J., & White, R. B.. A predictive model for the tokamak density limit. United States. doi:10.1088/0029-5515/56/10/106001.
Teng, Q., Brennan, D. P., Delgado-Aparicio, L., Gates, D. A., Swerdlow, J., and White, R. B.. Thu . "A predictive model for the tokamak density limit". United States. doi:10.1088/0029-5515/56/10/106001. https://www.osti.gov/servlets/purl/1335462.
@article{osti_1335462,
title = {A predictive model for the tokamak density limit},
author = {Teng, Q. and Brennan, D. P. and Delgado-Aparicio, L. and Gates, D. A. and Swerdlow, J. and White, R. B.},
abstractNote = {We reproduce the Greenwald density limit, in all tokamak experiments by using a phenomenologically correct model with parameters in the range of experiments. A simple model of equilibrium evolution and local power balance inside the island has been implemented to calculate the radiation-driven thermo-resistive tearing mode growth and explain the density limit. Strong destabilization of the tearing mode due to an imbalance of local Ohmic heating and radiative cooling in the island predicts the density limit within a few percent. Furthermore, we found the density limit and it is a local edge limit and weakly dependent on impurity densities. Our results are robust to a substantial variation in model parameters within the range of experiments.},
doi = {10.1088/0029-5515/56/10/106001},
journal = {Nuclear Fusion},
number = 10,
volume = 56,
place = {United States},
year = {Thu Jul 28 00:00:00 EDT 2016},
month = {Thu Jul 28 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
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