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Experimental data on electromagnetic fluctuations in DIII-D, made availableby the Faraday-effect Radial Interferometer-Polarimeter (RIP) diagnostic, isexamined in comparison with detailed gyrokinetic simulations using GyrokineticElectromagnetic Numerical Experiment (GENE). The diagnostic has the uniquecapability of making internal measurements of fluctuating magnetic fields$\frac{\int n_e \delta B_r dR}{\int n_e dR}$. Local linear simulations identifymicrotearing modes (MTMs) over a substantial range of toroidal mode numbers(peaking at $n=15$) with frequencies in good agreement with the experimentaldata. Local nonlinear simulations reinforce this result by producing a magneticfrequency spectrum in good agreement with that diagnosed by RIP. Simulated heatfluxes are in the range of experimental expectations. However, magneticfluctuation amplitudes are substantially lower than the experimentalexpectations. Possible sources of this discrepancy are discussed, notably thefact that the diagnostics are localized at the mid-plane -- the poloidallocation where the simulations predict the fluctuation amplitudes to besmallest. Despite some discrepancies, several connections between simulationsand experiments, combined with general criteria discriminating betweenpotential pedestal instabilities, strongly point to MTMs as the source of theobserved magnetic fluctuations.

Gyrokinetic Simulations Compared with Magnetic Fluctuations Diagnosed with a Faraday-Effect Radial Interferometer-Polarimeter in the DIII-D pedestal