Time-Domain Measurement of Broadband Coherent Cherenkov Radiation

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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 antenna (LPDA) 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 ... continued below

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10 pages

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Miocinovic, P.; U., /Hawaii; Field, R.C.; /SLAC; Gorham, P.W.; Guillian, E. et al. March 13, 2006.

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Description

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 antenna (LPDA) 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; {sigma}{sub R|E|} = 0.039 {micro}V/MHz/TeV and {sigma}{sub {phi}} = 17{sup o}. 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{sub v} {ge} 10{sup 15} eV.

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10 pages

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  • Report No.: SLAC-PUB-11749
  • Grant Number: AC02-76SF00515
  • DOI: 10.2172/877430 | External Link
  • Office of Scientific & Technical Information Report Number: 877430
  • Archival Resource Key: ark:/67531/metadc879754

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  • March 13, 2006

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 3:42 p.m.

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Miocinovic, P.; U., /Hawaii; Field, R.C.; /SLAC; Gorham, P.W.; Guillian, E. et al. Time-Domain Measurement of Broadband Coherent Cherenkov Radiation, report, March 13, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc879754/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.