Apr 9, 2005 Scaling of Askaryan Pulses D. Seckel, Univ. of Delaware.

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Presentation transcript:

Apr 9, 2005 Scaling of Askaryan Pulses D. Seckel, Univ. of Delaware

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Topics RF pulses from Showers

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Radiation from single particles ZHS: 2 0.5

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Sum over particles/Integrate over shower Shower Front + Light Cone Density of Excess Projected Track Length

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Separation of Variables & Form Factor

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Phase Factors and Rescaling FF Most MC’s use this

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Normalization and Determination of f, G y, G z

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) AVZ, ZHS, (G4 later) AVZ Use a Gaussian, and give the half-width of the Cerenkov cone at 1 GHz as 3.72 ° for a 1 PeV (3.1 m) shower. Determine G z as FT of gaussian

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Scaling vs AVZ Field calculation is integral over shower profile Separation of shower profile Separation of form factors With scaled frequencies Adapted from Alvarez, Vazquez, Zas “Full sim” is approx a Blue – Gaussian for f(z), AVZ approx c for G y Red – Griessen for f(z) Separation of phase factors

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) High frequency

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Phases

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Scaling with energy and type

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Scaling with medium AVZ scaled G4

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Scaling behavior fractional excess Single particle & shower signals Includes LPM effect z y cc to observer

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Pulse shapes

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Scaling model w/Shahid’s G4 10 TeV shower

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Multiple showers

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Fluctuations

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Better shower profiles?

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Acoustic (in progress) Same as radio except –scalar vs vector –total track length –v/c is smaller –attenuation –experiment bandwidth

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Summary