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Title: Optimization of pumping performance in the EAST upgraded divertor

Abstract

The pumping performance of the EAST tokamak upgraded divertor has been optimized by varying the height and width of the duct that connects the plasma and plenum volumes. The optimization is enacted using a semi-analytic model which predicts the molecular pressure in the plenum given the plasma facing component geometry and plasma parameters along the divertor, specifically electron temperature, electron density, and the ion particle flux. The model is semi-analytic as the plasma parameters can come from experimental data (or plasma transport simulations), and uses a first-flight approximation for neutral transport. This model is computationally inexpensive, allowing for several geometries and sets of plasma parameters to be rapidly evaluated. A duct geometry is discovered that performs well for different plasma equilibria and strike point positions. The semi-analytic model results are compared to two dimensional plasma and neutral transport simulations using the SOLPS-ITER code, suggesting that charge-exchange is a significant contributor to the plenum pressure at low electron temperature. An extension to the semi-analytic model improves the comparison over a broader range of temperature. The conservative prediction of the model and the broad maximum in the pressure contours imply that the inclusion of charge-exchange is not required in the optimization procedure,more » but that quantitative estimates should be provided with a high-fidelity model such as SOLPS-ITER.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2];  [2];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Chinese Academy of Sciences (CAS),Hefei (China)
  3. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1512464
Alternate Identifier(s):
OSTI ID: 1511939
Grant/Contract Number:  
AC05-00OR22725; AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 61; Journal Issue: 6; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; pumping optimization; SOLPS-ITER; neutral transport

Citation Formats

Lore, J. D., Wilcox, R. S., Canik, J. M., Wang, L., Xu, G. S., and Maingi, R. Optimization of pumping performance in the EAST upgraded divertor. United States: N. p., 2019. Web. doi:10.1088/1361-6587/ab110e.
Lore, J. D., Wilcox, R. S., Canik, J. M., Wang, L., Xu, G. S., & Maingi, R. Optimization of pumping performance in the EAST upgraded divertor. United States. doi:10.1088/1361-6587/ab110e.
Lore, J. D., Wilcox, R. S., Canik, J. M., Wang, L., Xu, G. S., and Maingi, R. Fri . "Optimization of pumping performance in the EAST upgraded divertor". United States. doi:10.1088/1361-6587/ab110e. https://www.osti.gov/servlets/purl/1512464.
@article{osti_1512464,
title = {Optimization of pumping performance in the EAST upgraded divertor},
author = {Lore, J. D. and Wilcox, R. S. and Canik, J. M. and Wang, L. and Xu, G. S. and Maingi, R.},
abstractNote = {The pumping performance of the EAST tokamak upgraded divertor has been optimized by varying the height and width of the duct that connects the plasma and plenum volumes. The optimization is enacted using a semi-analytic model which predicts the molecular pressure in the plenum given the plasma facing component geometry and plasma parameters along the divertor, specifically electron temperature, electron density, and the ion particle flux. The model is semi-analytic as the plasma parameters can come from experimental data (or plasma transport simulations), and uses a first-flight approximation for neutral transport. This model is computationally inexpensive, allowing for several geometries and sets of plasma parameters to be rapidly evaluated. A duct geometry is discovered that performs well for different plasma equilibria and strike point positions. The semi-analytic model results are compared to two dimensional plasma and neutral transport simulations using the SOLPS-ITER code, suggesting that charge-exchange is a significant contributor to the plenum pressure at low electron temperature. An extension to the semi-analytic model improves the comparison over a broader range of temperature. The conservative prediction of the model and the broad maximum in the pressure contours imply that the inclusion of charge-exchange is not required in the optimization procedure, but that quantitative estimates should be provided with a high-fidelity model such as SOLPS-ITER.},
doi = {10.1088/1361-6587/ab110e},
journal = {Plasma Physics and Controlled Fusion},
number = 6,
volume = 61,
place = {United States},
year = {2019},
month = {4}
}

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