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Fluctuation Measurements With two Separated Probe Arrays on the Same Flux Tube
Author(s) -
Bengtson Roger D.,
Winslow D. L.,
Ross D. W.
Publication year - 1998
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.19980380121
Subject(s) - turbulence , physics , tokamak , langmuir probe , wave turbulence , flux (metallurgy) , coherence (philosophical gambling strategy) , computational physics , tube (container) , flux tube , wavenumber , optics , plasma diagnostics , mechanics , magnetic flux , plasma , magnetic field , materials science , nuclear physics , quantum mechanics , metallurgy , composite material
We conducted a set of experiments on the TEXT‐U tokamak using two Langmuir probe arrays separated by 12 m located on or near the same magnetic flux tube. The magnetic flux tube location is determined by driving one set of probes with a single frequency wave and measuring the waves at the downstream location. The driven wave propagates as a shear‐Alfvén wave. From the combination of the driven waves and the location of peak correlation of background turbulence we are able to estimate an average k ‖ for the background turbulence. The high coherence (>0.6) of the background turbulence signals from probes separated by 12 m suggests that most of the power in edge turbulence is contained in long structures (>18 m) in the parallel direction.