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• W4210584280 abstract "Abstract The eigenfunction of an instability contains information about energy flow in the wave. In this study, the amplitude and phase of electron cyclotron emission radiometer data from hundreds of DIII-D reversed shear Alfvén eigenmodes (RSAE) and toroidicity-induced Alfvén eigenmodes (TAE) are analyzed along the outboard horizontal midplane. The radial phase profile can be flat, linearly rising or falling, convex or concave; in other words, a wide variety of shapes is observed. For a particular mode, often the radial phase profile remains approximately constant as the mode evolves in time but sometimes it changes rapidly. Many TAEs and some RSAEs have phase profiles that are rather flat where the mode amplitude is largest but rise steadily by <?CDATA $sim 2pi $?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll> <mml:mo>∼</mml:mo> <mml:mn>2</mml:mn> <mml:mi>π</mml:mi> </mml:math> at large major radius. Rapid phase changes are observed when the frequencies of an RSAE and TAE overlap and the modes couple. The phase profile depends weakly on the fast-ion gradient that would appear in the absence of wave-induced transport. Linear and quadratic fits to the phase profiles, together with many plasma parameters, are assembled into RSAE and TAE databases. In both cases, large variability is observed. For RSAEs, the strongest phase dependencies are on electron temperature T e , RSAE mode frequency, and the density of carbon impurities. For TAEs, the strongest dependencies are on beam power and major radius of the mode. In general, the average RSAE radial phase profile is essentially flat but the TAE profile has non-zero slope and curvature." @default.
• W4210584280 created "2022-02-08" @default.
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• W4210584280 date "2022-04-05" @default.
• W4210584280 modified "2023-10-17" @default.
• W4210584280 title "The radial phase variation of reversed-shear and toroidicity-induced Alfvén eigenmodes in DIII-D" @default.
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• W4210584280 doi "https://doi.org/10.1088/1741-4326/ac5109" @default.
• W4210584280 hasPublicationYear "2022" @default.
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