@article{ford_peterson_brandon_nam_walker_shannon_2019, title={Measurement of localized plasma perturbation with hairpin resonator probes}, volume={26}, ISSN={1070-664X 1089-7674}, url={http://dx.doi.org/10.1063/1.5065509}, DOI={10.1063/1.5065509}, abstractNote={In situ plasma diagnostics present the classical problem of the scientific measurement: how does one accurately measure a system without also perturbing it? The uncertainty in the degree of perturbation then reflects an inherent uncertainty in the diagnostic results. Microwave probes are no exception. This work discusses an experimental methodology for quantifying the local perturbation in hairpin resonator probe measurements. By pulsing the delivered power to a plasma, an electron density hairpin spike (HS) is readily detected at generator shutoff. The phenomenon is understood to arise from an apparent density rise as the plasma sheath collapses, thus raising the spatially averaged density measured between the hairpin tines. Other explanations for the density rise are eliminated, and the utility of the HS is presented. Under the conditions investigated, the HS provides an experimental comparison to a previous sheath correction factor developed by Sands et al.}, number={1}, journal={Physics of Plasmas}, publisher={AIP Publishing}, author={Ford, Kristopher and Peterson, David J. and Brandon, Joel and Nam, Sang Ki and Walker, Dustin and Shannon, Steven C.}, year={2019}, month={Jan}, pages={013510} }