Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-02-23
Phys.Rev. D74 (2006) 043002
Physics
High Energy Physics
High Energy Physics - Experiment
10 pages, 9 figures, accepted by Phys. Rev. D
Scientific paper
10.1103/PhysRevD.74.043002
We report on further analysis of coherent microwave Cherenkov impulses emitted via the Askaryan mechanism from high-energy electromagnetic showers produced at the Stanford Linear Accelerator Center (SLAC). In this report, the time-domain based analysis of the measurements made with a broadband (nominally 1-18 GHz) log periodic dipole array antenna is described. The theory of a transmit-receive antenna system based on time-dependent effective height operator is summarized and applied to fully characterize the measurement antenna system and to reconstruct the electric field induced via the Askaryan process. The observed radiation intensity and phase as functions of frequency were found to agree with expectations from 0.75-11.5 GHz within experimental errors on the normalized electric field magnitude and the relative phase; 0.039 microV/MHz/TeV and 17 deg, respectively. This is the first time this agreement has been observed over such a broad bandwidth, and the first measurement of the relative phase variation of an Askaryan pulse. The importance of validation of the Askaryan mechanism is significant since it is viewed as the most promising way to detect cosmogenic neutrino fluxes at E > 10^15 eV.
Field R. C.
Gorham Peter. W.
Guillian Eugene
Milincic Radovan
Miocinovic Predrag
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