Edge turbulence velocity changes with lithium coating on NSTX

B. Cao; S. J. Zweben; D. P. Stotler; M. Bell; A. Diallo; S. M. Kaye; B. Leblanc

doi:10.1088/0741-3335/54/11/112001

Edge turbulence velocity changes with lithium coating on NSTX

B. Cao, S. J. Zweben, D. P. Stotler, M. Bell, A. Diallo, S. M. Kaye, B. Leblanc

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

9 Scopus citations

Abstract

Lithium coating improves energy confinement and eliminates edge-localized modes in the National Spherical Torus Experiment (NSTX), but the mechanism of this improvement is not yet well understood. We used the gas-puff-imaging diagnostic on NSTX to measure the changes in edge turbulence which occurred during a scan with variable lithium wall coating, in order to help understand the reason for the confinement improvement with lithium. There was a small increase in the edge turbulence poloidal velocity and a decrease in the poloidal velocity fluctuation level with increased lithium. The possible effect of varying edge neutral density on turbulence damping was evaluated for these cases in NSTX.

Original language	English (US)
Article number	112001
Journal	Plasma Physics and Controlled Fusion
Volume	54
Issue number	11
DOIs	https://doi.org/10.1088/0741-3335/54/11/112001
State	Published - Nov 2012

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

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10.1088/0741-3335/54/11/112001

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title = "Edge turbulence velocity changes with lithium coating on NSTX",

abstract = "Lithium coating improves energy confinement and eliminates edge-localized modes in the National Spherical Torus Experiment (NSTX), but the mechanism of this improvement is not yet well understood. We used the gas-puff-imaging diagnostic on NSTX to measure the changes in edge turbulence which occurred during a scan with variable lithium wall coating, in order to help understand the reason for the confinement improvement with lithium. There was a small increase in the edge turbulence poloidal velocity and a decrease in the poloidal velocity fluctuation level with increased lithium. The possible effect of varying edge neutral density on turbulence damping was evaluated for these cases in NSTX.",

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T1 - Edge turbulence velocity changes with lithium coating on NSTX

AU - Cao, B.

AU - Zweben, S. J.

AU - Stotler, D. P.

AU - Bell, M.

AU - Diallo, A.

AU - Kaye, S. M.

AU - Leblanc, B.

PY - 2012/11

Y1 - 2012/11

N2 - Lithium coating improves energy confinement and eliminates edge-localized modes in the National Spherical Torus Experiment (NSTX), but the mechanism of this improvement is not yet well understood. We used the gas-puff-imaging diagnostic on NSTX to measure the changes in edge turbulence which occurred during a scan with variable lithium wall coating, in order to help understand the reason for the confinement improvement with lithium. There was a small increase in the edge turbulence poloidal velocity and a decrease in the poloidal velocity fluctuation level with increased lithium. The possible effect of varying edge neutral density on turbulence damping was evaluated for these cases in NSTX.

AB - Lithium coating improves energy confinement and eliminates edge-localized modes in the National Spherical Torus Experiment (NSTX), but the mechanism of this improvement is not yet well understood. We used the gas-puff-imaging diagnostic on NSTX to measure the changes in edge turbulence which occurred during a scan with variable lithium wall coating, in order to help understand the reason for the confinement improvement with lithium. There was a small increase in the edge turbulence poloidal velocity and a decrease in the poloidal velocity fluctuation level with increased lithium. The possible effect of varying edge neutral density on turbulence damping was evaluated for these cases in NSTX.

UR - https://www.scopus.com/pages/publications/84868021870

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DO - 10.1088/0741-3335/54/11/112001

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SN - 0741-3335

VL - 54

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 11

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ER -

Edge turbulence velocity changes with lithium coating on NSTX

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