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

Shoji, M.; Kawamura, G.; Smirnov, R.; Tanaka, Y.; Masuzaki, S.; Uesugi, Y.; Ashikawa, N.; Gilson, E.; Lunsford, R.

doi:10.1002/ctpp.201900101

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

Journal Article · Wed Dec 11 23:00:00 EST 2019 · Contributions to Plasma Physics

DOI:https://doi.org/10.1002/ctpp.201900101· OSTI ID:1644264

Shoji, M. ^[1]; Kawamura, G. ^[1]; Smirnov, R. ^[2]; Tanaka, Y. ^[3]; Masuzaki, S. ^[1]; Uesugi, Y. ^[3]; Ashikawa, N. ^[1]; Gilson, E. ^[4]; Lunsford, R. ^[4]

National Inst. for Fusion Science, Gifu (Japan)
Univ. of California, San Diego, CA (United States)
Kanazawa Univ. (Japan)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: 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

Grant/Contract Number:: FG02-06ER54852

OSTI ID:: 1644264

Alternate ID(s):: OSTI ID: 1643718
OSTI ID: 22972015

Journal Information:: Contributions to Plasma Physics, Journal Name: Contributions to Plasma Physics Journal Issue: 5-6 Vol. 60; ISSN 0863-1042

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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