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Askaryan Signal Simulation in SALSA: Insights into Neutrino Detection Mechanisms

Explore the Askaryan signal simulation in the SALSA project, focusing on neutrino detection with dipole antennas. Learn about signal calculations, attenuation effects in Earth and salt, cone width variations, and zenith angle sensitivity. Discover the unique features of the SALSA simulation code and its implications for high-energy neutrino research.

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Askaryan Signal Simulation in SALSA: Insights into Neutrino Detection Mechanisms

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  1. Another Straw-person SALSA Simulation Amy Connolly UCLA February 4th, 2005 Work by A. Connolly, D. Saltzerg and D. Williams

  2. Outline of the Code • Instrumented region is (2 km)3 cube • Pick interaction position from (8 km)3 cube beginning 500 m below the Earth’s surface • 1000 dipole-like dual-polarization antennas (10 along each edge) 100-200 MHz • Calculate signal detected at each antenna • Require 4 hits, each 6 above RMS noise • Each event is weighted for prob. of atten. along ’s path length in Earth, salt • Simple earth model (core, mantle, crust) • Assume salt atten. length (»1/n) =600 m at 150MHz

  3. The Askaryan Signal: Electric Field • Electric field emitted at interaction: • For salt (from personal communication w/ J. Alvarez Muniz in Fall 2003) • C=1.10£10-7 , 0=1300 MHz, » 1.5 • Compare to ice (J. Alvarez Muniz, astro-ph/0003315) • C=2.53£10-7, 0=1150 MHz, =1.44

  4. The Askaryan Signal: Cone Width • Width of Cerenkov cone (astro-ph/9706064, astro-ph/0003315, Phys.Lett.B434,396 (1998)): • Material dependence • Index of refraction • Shower length

  5. The Signal: Cone Width (cont) • Phys.Lett.B434, 396(1998): • Beyond parameterization (>7), scaling by 7.5% per decade. • n-dependence? • Need theorists to come up with concise instructions for simulating the Askaryan signal, complete for all relevant media

  6. Zenith Angle • SALSA only sensitive to down-going ’s • distribution independent of energy • Cross-section measurement seems difficult

  7. Interaction Position • For E=1019 eV, where events occur that are triggered: Vertical Plane Horizontal Plane

  8. Sensitivity

  9. Conclusions • Simple simulation program written with results similar to Peter’s • How high a frequency do we need to go to • Need unified message from theorists on simulation of signal

  10. Backup Slides

  11. Trigger Rates E=1018 eV Local coincidence: 20 ns Global coincidence: 10 s • 4-fold, 6! coincidence rate essentially zero. • 4-fold, 4! <~ 1/year

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