The beam emission spectroscopy diagnostic on the DIII-D tokamak

G. McKee; R. Ashley; R. Durst; R. Fonck; M. Jakubowski; K. Tritz; K. Burrell; C. Greenfield; J. Robinson

doi:10.1063/1.1149416

The beam emission spectroscopy diagnostic on the DIII-D tokamak

G. McKee, R. Ashley, R. Durst, R. Fonck, M. Jakubowski, K. Tritz, K. Burrell, C. Greenfield, J. Robinson

Fusion Energy Division

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

193 Scopus citations

Abstract

A beam emission spectroscopy system has been installed on DIII-D to provide localized density fluctuation measurements for long-wavelength turbulent modes with t≤3 cm^-1 which are typically associated with anomalous radial transport. High signal-to-noise fluctuations measurements are accomplished through use of high speed electronics to maintain a frequency response of over 500 KHz and cryogenically cooled amplifiers and detectors to reduce electronic noise. The optics and neutral beam-sightline geometry have been optimized to allow for spatial resolution of Δr ≤1 cm. In addition, a half-scale two-dimensional (2D) fiber array to measure the 2D turbulent density field, necessary to measure the full S(k_r,k_θ) wavenumber spectra, has been implemented and initial results obtained.

Original language	English
Pages (from-to)	913-916
Number of pages	4
Journal	Review of Scientific Instruments
Volume	70
Issue number	1 II
DOIs	https://doi.org/10.1063/1.1149416
State	Published - Jan 1999

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abstract = "A beam emission spectroscopy system has been installed on DIII-D to provide localized density fluctuation measurements for long-wavelength turbulent modes with t≤3 cm-1 which are typically associated with anomalous radial transport. High signal-to-noise fluctuations measurements are accomplished through use of high speed electronics to maintain a frequency response of over 500 KHz and cryogenically cooled amplifiers and detectors to reduce electronic noise. The optics and neutral beam-sightline geometry have been optimized to allow for spatial resolution of Δr ≤1 cm. In addition, a half-scale two-dimensional (2D) fiber array to measure the 2D turbulent density field, necessary to measure the full S(kr,kθ) wavenumber spectra, has been implemented and initial results obtained.",

author = "G. McKee and R. Ashley and R. Durst and R. Fonck and M. Jakubowski and K. Tritz and K. Burrell and C. Greenfield and J. Robinson",

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AU - McKee, G.

AU - Ashley, R.

AU - Durst, R.

AU - Fonck, R.

AU - Jakubowski, M.

AU - Tritz, K.

AU - Burrell, K.

AU - Greenfield, C.

AU - Robinson, J.

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AB - A beam emission spectroscopy system has been installed on DIII-D to provide localized density fluctuation measurements for long-wavelength turbulent modes with t≤3 cm-1 which are typically associated with anomalous radial transport. High signal-to-noise fluctuations measurements are accomplished through use of high speed electronics to maintain a frequency response of over 500 KHz and cryogenically cooled amplifiers and detectors to reduce electronic noise. The optics and neutral beam-sightline geometry have been optimized to allow for spatial resolution of Δr ≤1 cm. In addition, a half-scale two-dimensional (2D) fiber array to measure the 2D turbulent density field, necessary to measure the full S(kr,kθ) wavenumber spectra, has been implemented and initial results obtained.

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The beam emission spectroscopy diagnostic on the DIII-D tokamak

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