Measurement of iron transport in the tftr tokamak by charge exchange recombination spectroscopy

B. C. Stratton; E. J. Synakowski; P. C. Efthimion; R. J. Fonck; K. W. Hill; R. A. Hulse; D. W. Johnson; H. Park; G. Taylor; J. Timberlake

doi:10.1088/0029-5515/31/1/015

Measurement of iron transport in the tftr tokamak by charge exchange recombination spectroscopy

B. C. Stratton, E. J. Synakowski, P. C. Efthimion, R. J. Fonck, K. W. Hill, R. A. Hulse, D. W. Johnson, H. Park, G. Taylor, J. Timberlake

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Abstract

Transport of iron in TFTR discharges heated by 6.7 MW of co-injected neutral beam power has been studied by spatially resolved charge exchange recombination spectroscopy in the visible region of the spectrum. Thç time evolutions of the densities of Fe²⁴⁺ and Fe²³⁺ ions following injection of iron are modelled by the neoclassical flux plus a moderately hollow diffii- sivity, increasing linearly from 1.3 m²/s on axis to 2.4 m²/s at the plasma edge. For r/a > 0.5, the iron diffusivity is significantly smaller than the helium diffusivity measured in identical discharges, while it is larger in the region immediately surrounding the plasma axis.

Original language	English (US)
Pages (from-to)	171-175
Number of pages	5
Journal	Nuclear Fusion
Volume	31
Issue number	1
DOIs	https://doi.org/10.1088/0029-5515/31/1/015
State	Published - Jan 1991

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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title = "Measurement of iron transport in the tftr tokamak by charge exchange recombination spectroscopy",

abstract = "Transport of iron in TFTR discharges heated by 6.7 MW of co-injected neutral beam power has been studied by spatially resolved charge exchange recombination spectroscopy in the visible region of the spectrum. Th{\c c} time evolutions of the densities of Fe24+ and Fe23+ ions following injection of iron are modelled by the neoclassical flux plus a moderately hollow diffii- sivity, increasing linearly from 1.3 m2/s on axis to 2.4 m2/s at the plasma edge. For r/a > 0.5, the iron diffusivity is significantly smaller than the helium diffusivity measured in identical discharges, while it is larger in the region immediately surrounding the plasma axis.",

author = "Stratton, \{B. C.\} and Synakowski, \{E. J.\} and Efthimion, \{P. C.\} and Fonck, \{R. J.\} and Hill, \{K. W.\} and Hulse, \{R. A.\} and Johnson, \{D. W.\} and H. Park and G. Taylor and J. Timberlake",

year = "1991",

month = jan,

doi = "10.1088/0029-5515/31/1/015",

language = "English (US)",

volume = "31",

pages = "171--175",

journal = "Nuclear Fusion",

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TY - JOUR

T1 - Measurement of iron transport in the tftr tokamak by charge exchange recombination spectroscopy

AU - Stratton, B. C.

AU - Synakowski, E. J.

AU - Efthimion, P. C.

AU - Fonck, R. J.

AU - Hill, K. W.

AU - Hulse, R. A.

AU - Johnson, D. W.

AU - Park, H.

AU - Taylor, G.

AU - Timberlake, J.

PY - 1991/1

Y1 - 1991/1

N2 - Transport of iron in TFTR discharges heated by 6.7 MW of co-injected neutral beam power has been studied by spatially resolved charge exchange recombination spectroscopy in the visible region of the spectrum. Thç time evolutions of the densities of Fe24+ and Fe23+ ions following injection of iron are modelled by the neoclassical flux plus a moderately hollow diffii- sivity, increasing linearly from 1.3 m2/s on axis to 2.4 m2/s at the plasma edge. For r/a > 0.5, the iron diffusivity is significantly smaller than the helium diffusivity measured in identical discharges, while it is larger in the region immediately surrounding the plasma axis.

AB - Transport of iron in TFTR discharges heated by 6.7 MW of co-injected neutral beam power has been studied by spatially resolved charge exchange recombination spectroscopy in the visible region of the spectrum. Thç time evolutions of the densities of Fe24+ and Fe23+ ions following injection of iron are modelled by the neoclassical flux plus a moderately hollow diffii- sivity, increasing linearly from 1.3 m2/s on axis to 2.4 m2/s at the plasma edge. For r/a > 0.5, the iron diffusivity is significantly smaller than the helium diffusivity measured in identical discharges, while it is larger in the region immediately surrounding the plasma axis.

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DO - 10.1088/0029-5515/31/1/015

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VL - 31

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EP - 175

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 1

ER -

Measurement of iron transport in the tftr tokamak by charge exchange recombination spectroscopy

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