Lithium sputtering from lithium-coated plasma facing components in the NSTX divertor

F. Scotti; V. A. Soukhanovskii; J. W. Ahn; R. E. Bell; S. P. Gerhardt; M. A. Jaworski; R. Kaita; H. W. Kugel; A. G. McLean; E. T. Meier; M. Podestà; A. L. Roquemore

doi:10.1016/j.jnucmat.2014.12.032

Lithium sputtering from lithium-coated plasma facing components in the NSTX divertor

F. Scotti
, V. A. Soukhanovskii
, J. W. Ahn
, R. E. Bell
, S. P. Gerhardt
, M. A. Jaworski
, R. Kaita
, H. W. Kugel
, A. G. McLean
, E. T. Meier
, M. Podestà
, A. L. Roquemore

PPPL NSTX

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

Abstract Lithium sputtering yields and gross impurity influxes from lithium-coated graphite and molybdenum plasma facing components (PFCs) have been analyzed for the first time in the National Spherical Torus Experiment (NSTX) divertor during H-mode NBI-heated discharges. Motivated by the beneficial effects of lithium conditioning on discharge performance and reproducibility, evaporative lithium coatings were the routine wall conditioning technique in NSTX. Neutral lithium sputtering yields from solid lithium coatings in NSTX were found to be consistent with values reported from test stand experiments from deuterium-saturated lithium (with sputtering yields ^YLi∼0.03-0.07). Temperature-enhanced lithium sputtering was observed on lithium-coated graphite and molybdenum as a result of PFC heating by both embedded heaters and incident plasma heat flux, leading to ^YLi∼0.1-0.2 for surface temperatures above the lithium melting point.

Original language	English (US)
Article number	48763
Pages (from-to)	1165-1168
Number of pages	4
Journal	Journal of Nuclear Materials
Volume	463
DOIs	https://doi.org/10.1016/j.jnucmat.2014.12.032
State	Published - Jul 22 2015

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
General Materials Science
Nuclear Energy and Engineering

Access to Document

10.1016/j.jnucmat.2014.12.032

Cite this

Scotti, F., Soukhanovskii, V. A., Ahn, J. W., Bell, R. E., Gerhardt, S. P., Jaworski, M. A., Kaita, R., Kugel, H. W., McLean, A. G., Meier, E. T., Podestà, M., & Roquemore, A. L. (2015). Lithium sputtering from lithium-coated plasma facing components in the NSTX divertor. Journal of Nuclear Materials, 463, 1165-1168. Article 48763. https://doi.org/10.1016/j.jnucmat.2014.12.032

@article{17c7b0289ee9442ea902cbfaddccefd9,

title = "Lithium sputtering from lithium-coated plasma facing components in the NSTX divertor",

abstract = "Abstract Lithium sputtering yields and gross impurity influxes from lithium-coated graphite and molybdenum plasma facing components (PFCs) have been analyzed for the first time in the National Spherical Torus Experiment (NSTX) divertor during H-mode NBI-heated discharges. Motivated by the beneficial effects of lithium conditioning on discharge performance and reproducibility, evaporative lithium coatings were the routine wall conditioning technique in NSTX. Neutral lithium sputtering yields from solid lithium coatings in NSTX were found to be consistent with values reported from test stand experiments from deuterium-saturated lithium (with sputtering yields YLi∼0.03-0.07). Temperature-enhanced lithium sputtering was observed on lithium-coated graphite and molybdenum as a result of PFC heating by both embedded heaters and incident plasma heat flux, leading to YLi∼0.1-0.2 for surface temperatures above the lithium melting point.",

author = "F. Scotti and Soukhanovskii, \{V. A.\} and Ahn, \{J. W.\} and Bell, \{R. E.\} and Gerhardt, \{S. P.\} and Jaworski, \{M. A.\} and R. Kaita and Kugel, \{H. W.\} and McLean, \{A. G.\} and Meier, \{E. T.\} and M. Podest{\`a} and Roquemore, \{A. L.\}",

note = "Publisher Copyright: {\textcopyright} 2014 Published by Elsevier B.V.",

year = "2015",

month = jul,

day = "22",

doi = "10.1016/j.jnucmat.2014.12.032",

language = "English (US)",

volume = "463",

pages = "1165--1168",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Lithium sputtering from lithium-coated plasma facing components in the NSTX divertor

AU - Scotti, F.

AU - Soukhanovskii, V. A.

AU - Ahn, J. W.

AU - Bell, R. E.

AU - Gerhardt, S. P.

AU - Jaworski, M. A.

AU - Kaita, R.

AU - Kugel, H. W.

AU - McLean, A. G.

AU - Meier, E. T.

AU - Podestà, M.

AU - Roquemore, A. L.

PY - 2015/7/22

Y1 - 2015/7/22

N2 - Abstract Lithium sputtering yields and gross impurity influxes from lithium-coated graphite and molybdenum plasma facing components (PFCs) have been analyzed for the first time in the National Spherical Torus Experiment (NSTX) divertor during H-mode NBI-heated discharges. Motivated by the beneficial effects of lithium conditioning on discharge performance and reproducibility, evaporative lithium coatings were the routine wall conditioning technique in NSTX. Neutral lithium sputtering yields from solid lithium coatings in NSTX were found to be consistent with values reported from test stand experiments from deuterium-saturated lithium (with sputtering yields YLi∼0.03-0.07). Temperature-enhanced lithium sputtering was observed on lithium-coated graphite and molybdenum as a result of PFC heating by both embedded heaters and incident plasma heat flux, leading to YLi∼0.1-0.2 for surface temperatures above the lithium melting point.

AB - Abstract Lithium sputtering yields and gross impurity influxes from lithium-coated graphite and molybdenum plasma facing components (PFCs) have been analyzed for the first time in the National Spherical Torus Experiment (NSTX) divertor during H-mode NBI-heated discharges. Motivated by the beneficial effects of lithium conditioning on discharge performance and reproducibility, evaporative lithium coatings were the routine wall conditioning technique in NSTX. Neutral lithium sputtering yields from solid lithium coatings in NSTX were found to be consistent with values reported from test stand experiments from deuterium-saturated lithium (with sputtering yields YLi∼0.03-0.07). Temperature-enhanced lithium sputtering was observed on lithium-coated graphite and molybdenum as a result of PFC heating by both embedded heaters and incident plasma heat flux, leading to YLi∼0.1-0.2 for surface temperatures above the lithium melting point.

UR - https://www.scopus.com/pages/publications/84937522067

UR - https://www.scopus.com/pages/publications/84937522067#tab=citedBy

U2 - 10.1016/j.jnucmat.2014.12.032

DO - 10.1016/j.jnucmat.2014.12.032

M3 - Article

AN - SCOPUS:84937522067

SN - 0022-3115

VL - 463

SP - 1165

EP - 1168

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

M1 - 48763

ER -

Lithium sputtering from lithium-coated plasma facing components in the NSTX divertor

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this