"Beam-emission spectroscopy" diagnostics also measure edge fast-ion light

W. W. Heidbrink; G. R. McKee; D. R. Smith; A. Bortolon

doi:10.1088/0741-3335/53/8/085007

"Beam-emission spectroscopy" diagnostics also measure edge fast-ion light

W. W. Heidbrink, G. R. McKee, D. R. Smith, A. Bortolon

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

18 Scopus citations

Abstract

Beam-emission spectroscopy (BES) diagnostics normally detect fluctuations in the light emitted by an injected neutral beam. Under some circumstances, however, light from fast ions that charge exchange in the high neutral-density region at the edge of the plasma make appreciable contributions to the BES signals. This 'passive' fast-ion D_α (FIDA) light appears in BES signals from both the DIII-D tokamak and the National Spherical Torus Experiment (NSTX). One type of passive FIDA light is associated with classical orbits that traverse the edge. Another type is caused by instabilities that expel fast ions from the core; this light can complicate measurement of the instability eigenfunction.

Original language	English (US)
Article number	085007
Journal	Plasma Physics and Controlled Fusion
Volume	53
Issue number	8
DOIs	https://doi.org/10.1088/0741-3335/53/8/085007
State	Published - Aug 2011
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

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10.1088/0741-3335/53/8/085007

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title = "{"}Beam-emission spectroscopy{"} diagnostics also measure edge fast-ion light",

abstract = "Beam-emission spectroscopy (BES) diagnostics normally detect fluctuations in the light emitted by an injected neutral beam. Under some circumstances, however, light from fast ions that charge exchange in the high neutral-density region at the edge of the plasma make appreciable contributions to the BES signals. This 'passive' fast-ion Dα (FIDA) light appears in BES signals from both the DIII-D tokamak and the National Spherical Torus Experiment (NSTX). One type of passive FIDA light is associated with classical orbits that traverse the edge. Another type is caused by instabilities that expel fast ions from the core; this light can complicate measurement of the instability eigenfunction.",

author = "Heidbrink, \{W. W.\} and McKee, \{G. R.\} and Smith, \{D. R.\} and A. Bortolon",

year = "2011",

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doi = "10.1088/0741-3335/53/8/085007",

language = "English (US)",

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T1 - "Beam-emission spectroscopy" diagnostics also measure edge fast-ion light

AU - Heidbrink, W. W.

AU - McKee, G. R.

AU - Smith, D. R.

AU - Bortolon, A.

PY - 2011/8

Y1 - 2011/8

N2 - Beam-emission spectroscopy (BES) diagnostics normally detect fluctuations in the light emitted by an injected neutral beam. Under some circumstances, however, light from fast ions that charge exchange in the high neutral-density region at the edge of the plasma make appreciable contributions to the BES signals. This 'passive' fast-ion Dα (FIDA) light appears in BES signals from both the DIII-D tokamak and the National Spherical Torus Experiment (NSTX). One type of passive FIDA light is associated with classical orbits that traverse the edge. Another type is caused by instabilities that expel fast ions from the core; this light can complicate measurement of the instability eigenfunction.

AB - Beam-emission spectroscopy (BES) diagnostics normally detect fluctuations in the light emitted by an injected neutral beam. Under some circumstances, however, light from fast ions that charge exchange in the high neutral-density region at the edge of the plasma make appreciable contributions to the BES signals. This 'passive' fast-ion Dα (FIDA) light appears in BES signals from both the DIII-D tokamak and the National Spherical Torus Experiment (NSTX). One type of passive FIDA light is associated with classical orbits that traverse the edge. Another type is caused by instabilities that expel fast ions from the core; this light can complicate measurement of the instability eigenfunction.

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JF - Plasma Physics and Controlled Fusion

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ER -

"Beam-emission spectroscopy" diagnostics also measure edge fast-ion light

Abstract

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