Effect of lithium PFC coatings on NSTX density control

H. W. Kugel; M. G. Bell; R. Bell; C. Bush; D. Gates; T. Gray; R. Kaita; B. Leblanc; R. Maingi; R. Majeski; D. Mansfield; D. Mueller; S. Paul; R. Raman; A. L. Roquemore; S. Sabbagh; C. H. Skinner; V. Soukhanovskii; T. Stevenson; L. Zakharov

doi:10.1016/j.jnucmat.2007.01.220

Effect of lithium PFC coatings on NSTX density control

H. W. Kugel
, M. G. Bell
, R. Bell
, C. Bush
, D. Gates
, T. Gray
, R. Kaita
, B. Leblanc
, R. Maingi
, R. Majeski
, D. Mansfield
, D. Mueller
, S. Paul
, R. Raman
, A. L. Roquemore
, S. Sabbagh
, C. H. Skinner
, V. Soukhanovskii
, T. Stevenson
, L. Zakharov

Princeton University

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

Abstract

Lithium coatings on the graphite plasma facing components (PFCs) in NSTX are being investigated as a tool for density profile control and reducing the recycling of hydrogen isotopes. Repeated lithium pellet injection into Center Stack Limited and Lower Single Null ohmic helium discharges were used to coat graphite surfaces that had been pre-conditioned with ohmic helium discharges of the same shape to reduce their contribution to hydrogen isotope recycling. The following deuterium NBI reference discharges exhibited a reduction in density by a factor of about 3 for limited and 2 for diverted plasmas, respectively, and peaked density profiles. Recently, a lithium evaporator has been used to apply thin coatings on conditioned and unconditioned PFCs. Effects on the plasma density and the impurities were obtained by pre-conditioning the PFCs with ohmic helium discharges, and performing the first deuterium NBI discharge as soon as possible after applying the lithium coating.

Original language	American English
Pages (from-to)	791-796
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	363-365
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jnucmat.2007.01.220
State	Published - Jun 15 2007

ASJC Scopus subject areas

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

Keywords

Impurity control
Lithium
Particle control
Wall conditioning
Wall pumping

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10.1016/j.jnucmat.2007.01.220

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Kugel, H. W., Bell, M. G., Bell, R., Bush, C., Gates, D., Gray, T., Kaita, R., Leblanc, B., Maingi, R., Majeski, R., Mansfield, D., Mueller, D., Paul, S., Raman, R., Roquemore, A. L., Sabbagh, S., Skinner, C. H., Soukhanovskii, V., Stevenson, T., & Zakharov, L. (2007). Effect of lithium PFC coatings on NSTX density control. Journal of Nuclear Materials, 363-365(1-3), 791-796. https://doi.org/10.1016/j.jnucmat.2007.01.220

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title = "Effect of lithium PFC coatings on NSTX density control",

abstract = "Lithium coatings on the graphite plasma facing components (PFCs) in NSTX are being investigated as a tool for density profile control and reducing the recycling of hydrogen isotopes. Repeated lithium pellet injection into Center Stack Limited and Lower Single Null ohmic helium discharges were used to coat graphite surfaces that had been pre-conditioned with ohmic helium discharges of the same shape to reduce their contribution to hydrogen isotope recycling. The following deuterium NBI reference discharges exhibited a reduction in density by a factor of about 3 for limited and 2 for diverted plasmas, respectively, and peaked density profiles. Recently, a lithium evaporator has been used to apply thin coatings on conditioned and unconditioned PFCs. Effects on the plasma density and the impurities were obtained by pre-conditioning the PFCs with ohmic helium discharges, and performing the first deuterium NBI discharge as soon as possible after applying the lithium coating.",

keywords = "Impurity control, Lithium, Particle control, Wall conditioning, Wall pumping",

author = "Kugel, \{H. W.\} and Bell, \{M. G.\} and R. Bell and C. Bush and D. Gates and T. Gray and R. Kaita and B. Leblanc and R. Maingi and R. Majeski and D. Mansfield and D. Mueller and S. Paul and R. Raman and Roquemore, \{A. L.\} and S. Sabbagh and Skinner, \{C. H.\} and V. Soukhanovskii and T. Stevenson and L. Zakharov",

year = "2007",

month = jun,

day = "15",

doi = "10.1016/j.jnucmat.2007.01.220",

language = "American English",

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Kugel, HW, Bell, MG, Bell, R, Bush, C, Gates, D, Gray, T, Kaita, R, Leblanc, B , Maingi, R , Majeski, R, Mansfield, D, Mueller, D, Paul, S, Raman, R, Roquemore, AL, Sabbagh, S, Skinner, CH, Soukhanovskii, V, Stevenson, T & Zakharov, L 2007, 'Effect of lithium PFC coatings on NSTX density control', Journal of Nuclear Materials, vol. 363-365, no. 1-3, pp. 791-796. https://doi.org/10.1016/j.jnucmat.2007.01.220

TY - JOUR

T1 - Effect of lithium PFC coatings on NSTX density control

AU - Kugel, H. W.

AU - Bell, M. G.

AU - Bell, R.

AU - Bush, C.

AU - Gates, D.

AU - Gray, T.

AU - Kaita, R.

AU - Leblanc, B.

AU - Maingi, R.

AU - Majeski, R.

AU - Mansfield, D.

AU - Mueller, D.

AU - Paul, S.

AU - Raman, R.

AU - Roquemore, A. L.

AU - Sabbagh, S.

AU - Skinner, C. H.

AU - Soukhanovskii, V.

AU - Stevenson, T.

AU - Zakharov, L.

PY - 2007/6/15

Y1 - 2007/6/15

N2 - Lithium coatings on the graphite plasma facing components (PFCs) in NSTX are being investigated as a tool for density profile control and reducing the recycling of hydrogen isotopes. Repeated lithium pellet injection into Center Stack Limited and Lower Single Null ohmic helium discharges were used to coat graphite surfaces that had been pre-conditioned with ohmic helium discharges of the same shape to reduce their contribution to hydrogen isotope recycling. The following deuterium NBI reference discharges exhibited a reduction in density by a factor of about 3 for limited and 2 for diverted plasmas, respectively, and peaked density profiles. Recently, a lithium evaporator has been used to apply thin coatings on conditioned and unconditioned PFCs. Effects on the plasma density and the impurities were obtained by pre-conditioning the PFCs with ohmic helium discharges, and performing the first deuterium NBI discharge as soon as possible after applying the lithium coating.

AB - Lithium coatings on the graphite plasma facing components (PFCs) in NSTX are being investigated as a tool for density profile control and reducing the recycling of hydrogen isotopes. Repeated lithium pellet injection into Center Stack Limited and Lower Single Null ohmic helium discharges were used to coat graphite surfaces that had been pre-conditioned with ohmic helium discharges of the same shape to reduce their contribution to hydrogen isotope recycling. The following deuterium NBI reference discharges exhibited a reduction in density by a factor of about 3 for limited and 2 for diverted plasmas, respectively, and peaked density profiles. Recently, a lithium evaporator has been used to apply thin coatings on conditioned and unconditioned PFCs. Effects on the plasma density and the impurities were obtained by pre-conditioning the PFCs with ohmic helium discharges, and performing the first deuterium NBI discharge as soon as possible after applying the lithium coating.

KW - Impurity control

KW - Lithium

KW - Particle control

KW - Wall conditioning

KW - Wall pumping

UR - https://www.scopus.com/pages/publications/34248547506

UR - https://www.scopus.com/pages/publications/34248547506#tab=citedBy

U2 - 10.1016/j.jnucmat.2007.01.220

DO - 10.1016/j.jnucmat.2007.01.220

M3 - Article

SN - 0022-3115

VL - 363-365

SP - 791

EP - 796

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1-3

ER -

Effect of lithium PFC coatings on NSTX density control

Abstract

ASJC Scopus subject areas

Keywords

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