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

D. R. Smith | Zendy; E. Mazzucato | Zendy; W. Lee | Zendy; H. K. Park | Zendy; C. W. Domier | Zendy; N. C. Luhmann | Zendy

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

Author(s) -

D. R. Smith,

E. Mazzucato,

W. Lee,

H. K. Park,

C. W. Domier,

N. C. Luhmann

Publication year - 2008

Publication title -

review of scientific instruments

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.605

H-Index - 165

eISSN - 1089-7623

pISSN - 0034-6748

DOI - 10.1063/1.3039415

Subject(s) - plasma , electron temperature , physics , thomson scattering , scattering , toroid , spherical tokamak , electron , plasma diagnostics , curvature , turbulence , tokamak , torus , atomic physics , joint european torus , computational physics , electron scattering , optics , nuclear physics , mechanics , geometry , mathematics

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)rho(e) less, similar0.6 and k( perpendicular) less, similar20 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.

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