Abstract
Edge plasma fluctuations are studied with inserted triple Langmuir probes and magnetic coils in the TPE-1RM20 reversed-field pinch. Two-point measurements show that density and potential fluctuations have relatively low mode numbers (m < 3, n < 40). High coherence (γ = 0.5) with magnetic field fluctuations and similar mode spectra suggest that density and potential fluctuations are mainly caused by electromagnetic turbulence. Broadband magnetic fluctuations are dominated by m = 0, low-n modes and internally resonant m = 1 and m = 2 modes. A coherent (f = 20-30 kHz) m = 0, low-n mode is also observed. Particle flux driven by electrostatic electric field fluctuations is 50-100% of total flux obtained from Dα line intensity measurement. Low-frequency fluctuations (f < 100 kHz) give the main contribution to the total flux. Electrostatic fluctuation driven electron energy flux is only of the order of 10% of total non-radiative power loss.
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