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A collective scattering system for measuring electron gyroscale fluctuations on the National Spherical Torus Experiment

Title
A collective scattering system for measuring electron gyroscale fluctuations on the National Spherical Torus Experiment
Authors
Smith, DRMazzucato, ELee, WPark, HKDomier, CWLuhmann, NC
POSTECH Authors
Park, HK
Date Issued
Dec-2008
Publisher
AMER INST PHYSICS
Abstract
A collective scattering system has been installed on the National Spherical Torus Experiment (NSTX) to measure electron gyroscale fluctuations in NSTX plasmas. The system measures fluctuations with k(perpendicular to)rho(e)less than or similar to 0.6 and k(perpendicular to)less than or similar to 20 cm(-1). Up to five distinct wavenumbers are measured simultaneously, and the large toroidal curvature of NSTX plasmas provides enhanced spatial localization. Steerable optics can position the scattering volume throughout the plasma from the magnetic axis to the outboard edge. Initial measurements indicate rich turbulent dynamics on the electron gyroscale. The system will be a valuable tool for investigating the connection between electron temperature gradient turbulence and electron thermal transport in NSTX plasmas.
URI
http://oasis.postech.ac.kr/handle/2014.oak/29159
DOI
10.1063/1.3039415
ISSN
0034-6748
Article Type
Article
Citation
REVIEW OF SCIENTIFIC INSTRUMENTS, vol. 79, no. 12, 2008-12
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