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Another Straw-person SALSA Simulation

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

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Another Straw-person SALSA Simulation

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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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