Modification of edge plasma profiles in ELM-suppressed discharges with lithium coatings in NSTX

R. Maingi; R. E. Bell; M. G. Bell; D. A. Gates; E. D. Fredrickson; S. P. Gerhardt; R. Kaita; S. M. Kaye; F. A. Kelly; H. W. Kugel; B. P. LeBlanc; D. K. Mansfield; J. E. Menard; D. Mueller; T. H. Osborne; S. F. Paul; R. Raman; S. A. Sabbagh; V. A. Soukhanovskii; T. Stevenson

Modification of edge plasma profiles in ELM-suppressed discharges with lithium coatings in NSTX

R. Maingi, R. E. Bell, M. G. Bell, D. A. Gates, E. D. Fredrickson, S. P. Gerhardt, R. Kaita, S. M. Kaye, F. A. Kelly, H. W. Kugel, B. P. LeBlanc, D. K. Mansfield, J. E. Menard, D. Mueller, T. H. Osborne, S. F. Paul, R. Raman, S. A. Sabbagh, V. A. Soukhanovskii, T. Stevenson

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Reduction or elimination of edge localized modes (ELMs) while maintaining high confinement is essential for future fusion devices, e.g. ITER which has been designed for H-mode operation. An ELM-free regime was recently obtained in the National Spherical Torus Experiment (NSTX), following the application of lithium onto the graphite plasma facing components. The edge n_e profile was observed to shift radially inward by several cm at fixed outer boundary radius. This inward shift is attributed to reduced recycling and core fueling. The edge T_e profile was unaffected in the H-mode pedestal steep gradient region; however, the region of steep T_e gradient extended radially inward by several cm following lithium coatings. Consequently, the edge P_e profile broadened substantially. The edge T_i was also increased, as was the edge toroidal rotation. These lithium-enhanced discharges exhibited an improvement in normalized energy confinement time of up to 50%, with no sign of ELMs up to the global stability limit when β_N approached ∼ 5.5.

Original language	English (US)
Title of host publication	36th EPS Conference on Plasma Physics 2009, EPS 2009 - Europhysics Conference Abstracts
Pages	833-836
Number of pages	4
State	Published - 2009
Event	36th European Physical Society Conference on Plasma Physics 2009, EPS 2009 - Sofia, Bulgaria Duration: Jun 29 2009 → Jul 3 2009

Publication series

Name	36th EPS Conference on Plasma Physics 2009, EPS 2009 - Europhysics Conference Abstracts
Volume	33 E1

Conference

Conference	36th European Physical Society Conference on Plasma Physics 2009, EPS 2009
Country/Territory	Bulgaria
City	Sofia
Period	6/29/09 → 7/3/09

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics

Cite this

Maingi, R., Bell, R. E., Bell, M. G., Gates, D. A., Fredrickson, E. D., Gerhardt, S. P., Kaita, R., Kaye, S. M., Kelly, F. A., Kugel, H. W., LeBlanc, B. P., Mansfield, D. K., Menard, J. E., Mueller, D., Osborne, T. H., Paul, S. F., Raman, R., Sabbagh, S. A., Soukhanovskii, V. A., & Stevenson, T. (2009). Modification of edge plasma profiles in ELM-suppressed discharges with lithium coatings in NSTX. In 36th EPS Conference on Plasma Physics 2009, EPS 2009 - Europhysics Conference Abstracts (pp. 833-836). (36th EPS Conference on Plasma Physics 2009, EPS 2009 - Europhysics Conference Abstracts; Vol. 33 E1).

@inproceedings{da968e559f554f5ea6dd6ca1be9285b8,

title = "Modification of edge plasma profiles in ELM-suppressed discharges with lithium coatings in NSTX",

abstract = "Reduction or elimination of edge localized modes (ELMs) while maintaining high confinement is essential for future fusion devices, e.g. ITER which has been designed for H-mode operation. An ELM-free regime was recently obtained in the National Spherical Torus Experiment (NSTX), following the application of lithium onto the graphite plasma facing components. The edge ne profile was observed to shift radially inward by several cm at fixed outer boundary radius. This inward shift is attributed to reduced recycling and core fueling. The edge Te profile was unaffected in the H-mode pedestal steep gradient region; however, the region of steep Te gradient extended radially inward by several cm following lithium coatings. Consequently, the edge Pe profile broadened substantially. The edge Ti was also increased, as was the edge toroidal rotation. These lithium-enhanced discharges exhibited an improvement in normalized energy confinement time of up to 50\%, with no sign of ELMs up to the global stability limit when βN approached ∼ 5.5.",

author = "R. Maingi and Bell, \{R. E.\} and Bell, \{M. G.\} and Gates, \{D. A.\} and Fredrickson, \{E. D.\} and Gerhardt, \{S. P.\} and R. Kaita and Kaye, \{S. M.\} and Kelly, \{F. A.\} and Kugel, \{H. W.\} and LeBlanc, \{B. P.\} and Mansfield, \{D. K.\} and Menard, \{J. E.\} and D. Mueller and Osborne, \{T. H.\} and Paul, \{S. F.\} and R. Raman and Sabbagh, \{S. A.\} and Soukhanovskii, \{V. A.\} and T. Stevenson",

year = "2009",

language = "English (US)",

isbn = "9781622763368",

series = "36th EPS Conference on Plasma Physics 2009, EPS 2009 - Europhysics Conference Abstracts",

pages = "833--836",

booktitle = "36th EPS Conference on Plasma Physics 2009, EPS 2009 - Europhysics Conference Abstracts",

note = "36th European Physical Society Conference on Plasma Physics 2009, EPS 2009 ; Conference date: 29-06-2009 Through 03-07-2009",

}

Maingi, R, Bell, RE, Bell, MG, Gates, DA, Fredrickson, ED, Gerhardt, SP, Kaita, R, Kaye, SM, Kelly, FA, Kugel, HW, LeBlanc, BP, Mansfield, DK, Menard, JE, Mueller, D, Osborne, TH, Paul, SF, Raman, R, Sabbagh, SA, Soukhanovskii, VA & Stevenson, T 2009, Modification of edge plasma profiles in ELM-suppressed discharges with lithium coatings in NSTX. in 36th EPS Conference on Plasma Physics 2009, EPS 2009 - Europhysics Conference Abstracts. 36th EPS Conference on Plasma Physics 2009, EPS 2009 - Europhysics Conference Abstracts, vol. 33 E1, pp. 833-836, 36th European Physical Society Conference on Plasma Physics 2009, EPS 2009, Sofia, Bulgaria, 6/29/09.

Modification of edge plasma profiles in ELM-suppressed discharges with lithium coatings in NSTX. / Maingi, R.; Bell, R. E.; Bell, M. G. et al.
36th EPS Conference on Plasma Physics 2009, EPS 2009 - Europhysics Conference Abstracts. 2009. p. 833-836 (36th EPS Conference on Plasma Physics 2009, EPS 2009 - Europhysics Conference Abstracts; Vol. 33 E1).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Modification of edge plasma profiles in ELM-suppressed discharges with lithium coatings in NSTX

AU - Maingi, R.

AU - Bell, R. E.

AU - Bell, M. G.

AU - Gates, D. A.

AU - Fredrickson, E. D.

AU - Gerhardt, S. P.

AU - Kaita, R.

AU - Kaye, S. M.

AU - Kelly, F. A.

AU - Kugel, H. W.

AU - LeBlanc, B. P.

AU - Mansfield, D. K.

AU - Menard, J. E.

AU - Mueller, D.

AU - Osborne, T. H.

AU - Paul, S. F.

AU - Raman, R.

AU - Sabbagh, S. A.

AU - Soukhanovskii, V. A.

AU - Stevenson, T.

PY - 2009

Y1 - 2009

N2 - Reduction or elimination of edge localized modes (ELMs) while maintaining high confinement is essential for future fusion devices, e.g. ITER which has been designed for H-mode operation. An ELM-free regime was recently obtained in the National Spherical Torus Experiment (NSTX), following the application of lithium onto the graphite plasma facing components. The edge ne profile was observed to shift radially inward by several cm at fixed outer boundary radius. This inward shift is attributed to reduced recycling and core fueling. The edge Te profile was unaffected in the H-mode pedestal steep gradient region; however, the region of steep Te gradient extended radially inward by several cm following lithium coatings. Consequently, the edge Pe profile broadened substantially. The edge Ti was also increased, as was the edge toroidal rotation. These lithium-enhanced discharges exhibited an improvement in normalized energy confinement time of up to 50%, with no sign of ELMs up to the global stability limit when βN approached ∼ 5.5.

AB - Reduction or elimination of edge localized modes (ELMs) while maintaining high confinement is essential for future fusion devices, e.g. ITER which has been designed for H-mode operation. An ELM-free regime was recently obtained in the National Spherical Torus Experiment (NSTX), following the application of lithium onto the graphite plasma facing components. The edge ne profile was observed to shift radially inward by several cm at fixed outer boundary radius. This inward shift is attributed to reduced recycling and core fueling. The edge Te profile was unaffected in the H-mode pedestal steep gradient region; however, the region of steep Te gradient extended radially inward by several cm following lithium coatings. Consequently, the edge Pe profile broadened substantially. The edge Ti was also increased, as was the edge toroidal rotation. These lithium-enhanced discharges exhibited an improvement in normalized energy confinement time of up to 50%, with no sign of ELMs up to the global stability limit when βN approached ∼ 5.5.

UR - https://www.scopus.com/pages/publications/84872691175

UR - https://www.scopus.com/inward/citedby.url?scp=84872691175&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84872691175

SN - 9781622763368

T3 - 36th EPS Conference on Plasma Physics 2009, EPS 2009 - Europhysics Conference Abstracts

SP - 833

EP - 836

BT - 36th EPS Conference on Plasma Physics 2009, EPS 2009 - Europhysics Conference Abstracts

T2 - 36th European Physical Society Conference on Plasma Physics 2009, EPS 2009

Y2 - 29 June 2009 through 3 July 2009

ER -

Maingi R, Bell RE, Bell MG, Gates DA, Fredrickson ED, Gerhardt SP et al. Modification of edge plasma profiles in ELM-suppressed discharges with lithium coatings in NSTX. In 36th EPS Conference on Plasma Physics 2009, EPS 2009 - Europhysics Conference Abstracts. 2009. p. 833-836. (36th EPS Conference on Plasma Physics 2009, EPS 2009 - Europhysics Conference Abstracts).

Modification of edge plasma profiles in ELM-suppressed discharges with lithium coatings in NSTX

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All Science Journal Classification (ASJC) codes

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