The beam emission spectroscopy diagnostic on the DIII-D tokamak

A beam emission spectroscopy system has been installed on DIII-D to provide localized density fluctuation measurements for long-wavelength turbulent modes with k⩽3  cm −1 which are typically associated with anomalous radial transport. High signal-to-noise fluctuations measurements are accomplished t...

Full description

Saved in:
Bibliographic Details
Published in:Review of Scientific Instruments 1999-01, Vol.70 (1), p.913-916
Main Authors: McKee, G., Ashley, R., Durst, R., Fonck, R., Jakubowski, M., Tritz, K., Burrell, K., Greenfield, C., Robinson, J.
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A beam emission spectroscopy system has been installed on DIII-D to provide localized density fluctuation measurements for long-wavelength turbulent modes with k⩽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.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1149416