Design of a correlation reflectometer radiometer diagnostic and measurements of the electron density-temperature cross-phase angle in the H-mode pedestal with small edge localized modes at ASDEX Upgrade.
C Yoo, G D Conway, W Burke, P A Molina Cabrera, B Vanovac, R Bielajew, D J Cruz-Zabala, A Silva, A E White
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Abstract
This work presents the hardware design and first results from a newly commissioned correlation reflectometer radiometer diagnostic that measures the cross-phase angle between electron density and temperature fluctuations in ASDEX Upgrade plasmas. This diagnostic employs cross correlations between signals measured by a tunable, continuous wave, perpendicular incidence, fluctuation reflectometer, and a 24-channel radiometer sharing the same line of sight. Novel measurements in the pedestal of a helium H-mode plasma with small edge localized modes show changes in the cross-phase angle between the electron density and temperature fluctuations from ∼90° to 120°, suggesting changes in the properties of the turbulence driving transport in the plasma edge.
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Review of Scientific Instruments, is committed to the publication of advances in scientific instruments, apparatuses, and techniques. RSI seeks to meet the needs of engineers and scientists in physics, chemistry, and the life sciences.
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