Accelerator measurements of magnetically-induced radio emission from particle cascades with applications to cosmic-ray air showers

For fifty years, cosmic-ray air showers have been detected by their radio emission. We present the first laboratory measurements that validate electrodynamics simulations used in air shower modeling. An experiment at SLAC provides a beam test of radio-frequency (RF) radiation from charged particle cascades in the presence of a magnetic field, a model system of a cosmic-ray air shower. This experiment provides a suite of controlled laboratory measurements to compare to particle-level simulations of RF emission, which are relied upon in ultra-high-energy cosmic-ray air shower detection. We compare simulations to data for intensity, linearity with magnetic field, angular distribution, polarization, and spectral content. In particular, we confirm modern predictions that the magnetically induced emission in a dielectric forms a cone that peaks at the Cherenkov angle and show that the simulations reproduce the data within systematic uncertainties.Comment: 5 pages, 7 figure

Competencies in the Wild: Testing the Theoretical Assumptions of Competencies

Competencies have been present in the field of industrial-organizational psychology for 40 years, but there is little empirical research available concerning the construct. The current study used data from a functioning organization to better understand the relationships between competencies and the relationship of competencies to job performance. The study results suggest that competency ratings are stable over time, that different competencies are used to perform different types of goals, and that competencies moderate the relationship between job performance in year one and year two. A better understanding of competencies is necessary for practitioners to use the constructs most effectively