Mechanisms responsible for topographical changes in PLT stainless-steel and graphite limiters

S. A. Cohen; R. Budny; G. M. McCracken; M. Ulrickson

doi:10.1088/0029-5515/21/2/011

Mechanisms responsible for topographical changes in PLT stainless-steel and graphite limiters

S. A. Cohen, R. Budny, G. M. McCracken, M. Ulrickson

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

39 Scopus citations

Abstract

PLT limiters used during Ohmic and neutral-beam heated discharges were melted and eroded. For the steel limiters, the pattern of large (20 cm²) melted areas was 0.1 — 1.0-mm ripples in a regular array. The various types of damage can be explained by the power and momentum fluxes of bulk plasma and beam ions and by disruptions. The plasma scrape-off distance inferred from the extent of the damage ranges from 5 to 30 mm and is consistent with a radially outward drift velocity of 2 X 10⁴mm s^-1. A new model of the plasma scrape-off is presented which explains pattern and extent of the damage.

Original language	English (US)
Pages (from-to)	233-249
Number of pages	17
Journal	Nuclear Fusion
Volume	21
Issue number	2
DOIs	https://doi.org/10.1088/0029-5515/21/2/011
State	Published - Feb 1981

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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abstract = "PLT limiters used during Ohmic and neutral-beam heated discharges were melted and eroded. For the steel limiters, the pattern of large (20 cm2) melted areas was 0.1 — 1.0-mm ripples in a regular array. The various types of damage can be explained by the power and momentum fluxes of bulk plasma and beam ions and by disruptions. The plasma scrape-off distance inferred from the extent of the damage ranges from 5 to 30 mm and is consistent with a radially outward drift velocity of 2 X 104mm s-1. A new model of the plasma scrape-off is presented which explains pattern and extent of the damage.",

author = "Cohen, {S. A.} and R. Budny and McCracken, {G. M.} and M. Ulrickson",

year = "1981",

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AU - Cohen, S. A.

AU - Budny, R.

AU - McCracken, G. M.

AU - Ulrickson, M.

PY - 1981/2

Y1 - 1981/2

N2 - PLT limiters used during Ohmic and neutral-beam heated discharges were melted and eroded. For the steel limiters, the pattern of large (20 cm2) melted areas was 0.1 — 1.0-mm ripples in a regular array. The various types of damage can be explained by the power and momentum fluxes of bulk plasma and beam ions and by disruptions. The plasma scrape-off distance inferred from the extent of the damage ranges from 5 to 30 mm and is consistent with a radially outward drift velocity of 2 X 104mm s-1. A new model of the plasma scrape-off is presented which explains pattern and extent of the damage.

AB - PLT limiters used during Ohmic and neutral-beam heated discharges were melted and eroded. For the steel limiters, the pattern of large (20 cm2) melted areas was 0.1 — 1.0-mm ripples in a regular array. The various types of damage can be explained by the power and momentum fluxes of bulk plasma and beam ions and by disruptions. The plasma scrape-off distance inferred from the extent of the damage ranges from 5 to 30 mm and is consistent with a radially outward drift velocity of 2 X 104mm s-1. A new model of the plasma scrape-off is presented which explains pattern and extent of the damage.

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EP - 249

JO - Nuclear Fusion

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ER -

Mechanisms responsible for topographical changes in PLT stainless-steel and graphite limiters

Abstract

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