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Title: Full-torus impurity transport simulation for optimizing plasma discharge operation using a multi-species impurity powder dropper in the large helical device

Abstract

The transport of impurities supplied by a multi-species impurity powder dropper (IPD) in the large helical device (LHD) is investigated using a three-dimensional peripheral plasma fluid code (EMC3-EIRENE) coupled with a dust transport simulation code (DUSTT). The trajectories of impurity powder particles (Boron, Carbon, Iron, and Tungsten) dropped from the IPD and the impurity transport in the peripheral plasma are studied in a full-torus geometry. The simulation reveals an appropriate size of the impurity powder particles and an optimum operational range of the dust drop rates for investigating the impurity transport without inducing radiation collapse. The simulation also predicts a favourable plasma discharge condition for wall conditioning (boronization) using the IPD in order to deposit boron to high plasma flux and neutral particle density areas in the divertor region in the inboard side of the torus.

Authors:
 [1];  [1];  [2];  [3];  [1];  [3];  [1];  [4];  [4]
  1. National Inst. for Fusion Science, Gifu (Japan)
  2. Univ. of California, San Diego, CA (United States)
  3. Kanazawa Univ. (Japan)
  4. 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
Contributing Org.:
This work is performed under the auspices of the NIFS Collaboration Research program (NIFS12KNXN236). This work is also supported by JSPS KAKENHI Grant Numbers 16H04619, 16K18340
OSTI Identifier:
1644264
Alternate Identifier(s):
OSTI ID: 1643718
Grant/Contract Number:  
FG02-06ER54852
Resource Type:
Accepted Manuscript
Journal Name:
Contributions to Plasma Physics
Additional Journal Information:
Journal Volume: 60; Journal Issue: 5-6; Journal ID: ISSN 0863-1042
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DUSTT; EMC3‐EIRENE; ergodic layer; impurity powder dropper; LHD

Citation Formats

Shoji, M., Kawamura, G., Smirnov, R., Tanaka, Y., Masuzaki, S., Uesugi, Y., Ashikawa, N., Gilson, E., and Lunsford, R.. Full-torus impurity transport simulation for optimizing plasma discharge operation using a multi-species impurity powder dropper in the large helical device. United States: N. p., 2019. Web. https://doi.org/10.1002/ctpp.201900101.
Shoji, M., Kawamura, G., Smirnov, R., Tanaka, Y., Masuzaki, S., Uesugi, Y., Ashikawa, N., Gilson, E., & Lunsford, R.. Full-torus impurity transport simulation for optimizing plasma discharge operation using a multi-species impurity powder dropper in the large helical device. United States. https://doi.org/10.1002/ctpp.201900101
Shoji, M., Kawamura, G., Smirnov, R., Tanaka, Y., Masuzaki, S., Uesugi, Y., Ashikawa, N., Gilson, E., and Lunsford, R.. Thu . "Full-torus impurity transport simulation for optimizing plasma discharge operation using a multi-species impurity powder dropper in the large helical device". United States. https://doi.org/10.1002/ctpp.201900101. https://www.osti.gov/servlets/purl/1644264.
@article{osti_1644264,
title = {Full-torus impurity transport simulation for optimizing plasma discharge operation using a multi-species impurity powder dropper in the large helical device},
author = {Shoji, M. and Kawamura, G. and Smirnov, R. and Tanaka, Y. and Masuzaki, S. and Uesugi, Y. and Ashikawa, N. and Gilson, E. and Lunsford, R.},
abstractNote = {The transport of impurities supplied by a multi-species impurity powder dropper (IPD) in the large helical device (LHD) is investigated using a three-dimensional peripheral plasma fluid code (EMC3-EIRENE) coupled with a dust transport simulation code (DUSTT). The trajectories of impurity powder particles (Boron, Carbon, Iron, and Tungsten) dropped from the IPD and the impurity transport in the peripheral plasma are studied in a full-torus geometry. The simulation reveals an appropriate size of the impurity powder particles and an optimum operational range of the dust drop rates for investigating the impurity transport without inducing radiation collapse. The simulation also predicts a favourable plasma discharge condition for wall conditioning (boronization) using the IPD in order to deposit boron to high plasma flux and neutral particle density areas in the divertor region in the inboard side of the torus.},
doi = {10.1002/ctpp.201900101},
journal = {Contributions to Plasma Physics},
number = 5-6,
volume = 60,
place = {United States},
year = {2019},
month = {12}
}

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