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Title: Observation and modeling of inner divertor re-attachment in discharges with lithium coatings in NSTX

Abstract

In the National Spherical Torus Experiment (NSTX), modifications to the inner divertor plasma regimes are observed in high triangularity, H-mode, NBI heated discharges due to lithium coatings evaporated on the plasma facing components. In particular, the drop in the recombination rate, the reduced neutral pressure and the reduced electron density (inferred from Stark broadening measurements of high-n deuterium Balmer lines) suggested that the inner divertor, which is usually detached in discharges without lithium, re-attached. In conclusion, experimental results are compared to simulations obtained with a 1D partially ionized plasma transport model integrated in the non-local thermodynamic equilibrium radiation transport code CRETIN to understand how the reduced recycling affects the divertor parameters in NSTX discharges with lithium coatings.

Authors:
 [1];  [2];  [2];  [2];  [1];  [1];  [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1529185
Report Number(s):
LLNL-JRNL-434143
Journal ID: ISSN 0022-3115; 402083
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 415; Journal Issue: 1; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Scotti, Filippo, Soukhanovskii, V. A., Adams, M. L., Scott, H. A., Kugel, H. W., Kaita, R., and Roquemore, A. L. Observation and modeling of inner divertor re-attachment in discharges with lithium coatings in NSTX. United States: N. p., 2010. Web. doi:10.1016/j.jnucmat.2010.12.041.
Scotti, Filippo, Soukhanovskii, V. A., Adams, M. L., Scott, H. A., Kugel, H. W., Kaita, R., & Roquemore, A. L. Observation and modeling of inner divertor re-attachment in discharges with lithium coatings in NSTX. United States. doi:10.1016/j.jnucmat.2010.12.041.
Scotti, Filippo, Soukhanovskii, V. A., Adams, M. L., Scott, H. A., Kugel, H. W., Kaita, R., and Roquemore, A. L. Sun . "Observation and modeling of inner divertor re-attachment in discharges with lithium coatings in NSTX". United States. doi:10.1016/j.jnucmat.2010.12.041. https://www.osti.gov/servlets/purl/1529185.
@article{osti_1529185,
title = {Observation and modeling of inner divertor re-attachment in discharges with lithium coatings in NSTX},
author = {Scotti, Filippo and Soukhanovskii, V. A. and Adams, M. L. and Scott, H. A. and Kugel, H. W. and Kaita, R. and Roquemore, A. L.},
abstractNote = {In the National Spherical Torus Experiment (NSTX), modifications to the inner divertor plasma regimes are observed in high triangularity, H-mode, NBI heated discharges due to lithium coatings evaporated on the plasma facing components. In particular, the drop in the recombination rate, the reduced neutral pressure and the reduced electron density (inferred from Stark broadening measurements of high-n deuterium Balmer lines) suggested that the inner divertor, which is usually detached in discharges without lithium, re-attached. In conclusion, experimental results are compared to simulations obtained with a 1D partially ionized plasma transport model integrated in the non-local thermodynamic equilibrium radiation transport code CRETIN to understand how the reduced recycling affects the divertor parameters in NSTX discharges with lithium coatings.},
doi = {10.1016/j.jnucmat.2010.12.041},
journal = {Journal of Nuclear Materials},
number = 1,
volume = 415,
place = {United States},
year = {2010},
month = {12}
}

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