A density rise experiment on PLT

Strachan S. Munakata; N. Bretz; E. Mazzucato; C. W. Barnes; D. Boyd; S. A. Cohen; J. Hovey; R. Kaita; S. S. Medley; G. Schmidt; G. Tait; D. Voss

doi:10.1088/0029-5515/22/9/002

A density rise experiment on PLT

Strachan S. Munakata, N. Bretz, E. Mazzucato, C. W. Barnes, D. Boyd, S. A. Cohen, J. Hovey, R. Kaita, S. S. Medley, G. Schmidt, G. Tait, D. Voss

Princeton University

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

59 Scopus citations

Abstract

The evolution of the density profile in PLT during intense gas puffing is documented and analysed. Measurements of the spectrum of low-energy edge neutrals and of the change in central neutral density, indicate that charge-exchange processes alone cannot account for the central density rise. The transient density profile changes can be reproduced numerically by a diffusivity of of - 10⁴cm². s^-1and a spatially averaged inward flow of 10³cm.s^-1. These transport coefficients are 10-10²times larger than neoclassical. The ion energy confinement is reduced, the small-scale density fluctuations are increased, and runaway electron losses are increased during the density rise.

Original language	American English
Pages (from-to)	1145-1159
Number of pages	15
Journal	Nuclear Fusion
Volume	22
Issue number	9
DOIs	https://doi.org/10.1088/0029-5515/22/9/002
State	Published - Sep 1982

ASJC Scopus subject areas

Nuclear and High Energy Physics
Condensed Matter Physics

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title = "A density rise experiment on PLT",

abstract = "The evolution of the density profile in PLT during intense gas puffing is documented and analysed. Measurements of the spectrum of low-energy edge neutrals and of the change in central neutral density, indicate that charge-exchange processes alone cannot account for the central density rise. The transient density profile changes can be reproduced numerically by a diffusivity of of - 104cm2. s-1and a spatially averaged inward flow of 103cm.s-1. These transport coefficients are 10-102times larger than neoclassical. The ion energy confinement is reduced, the small-scale density fluctuations are increased, and runaway electron losses are increased during the density rise.",

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T1 - A density rise experiment on PLT

AU - Munakata, Strachan S.

AU - Bretz, N.

AU - Mazzucato, E.

AU - Barnes, C. W.

AU - Boyd, D.

AU - Cohen, S. A.

AU - Hovey, J.

AU - Kaita, R.

AU - Medley, S. S.

AU - Schmidt, G.

AU - Tait, G.

AU - Voss, D.

PY - 1982/9

Y1 - 1982/9

N2 - The evolution of the density profile in PLT during intense gas puffing is documented and analysed. Measurements of the spectrum of low-energy edge neutrals and of the change in central neutral density, indicate that charge-exchange processes alone cannot account for the central density rise. The transient density profile changes can be reproduced numerically by a diffusivity of of - 104cm2. s-1and a spatially averaged inward flow of 103cm.s-1. These transport coefficients are 10-102times larger than neoclassical. The ion energy confinement is reduced, the small-scale density fluctuations are increased, and runaway electron losses are increased during the density rise.

AB - The evolution of the density profile in PLT during intense gas puffing is documented and analysed. Measurements of the spectrum of low-energy edge neutrals and of the change in central neutral density, indicate that charge-exchange processes alone cannot account for the central density rise. The transient density profile changes can be reproduced numerically by a diffusivity of of - 104cm2. s-1and a spatially averaged inward flow of 103cm.s-1. These transport coefficients are 10-102times larger than neoclassical. The ion energy confinement is reduced, the small-scale density fluctuations are increased, and runaway electron losses are increased during the density rise.

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JO - Nuclear Fusion

JF - Nuclear Fusion

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A density rise experiment on PLT

Abstract

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