Scaling of Askaryan Pulses Apr 9 2005 D

Scaling of Askaryan Pulses Apr 9, 2005 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, Gy, Gz

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) AVZ, ZHS, (G 4 later) AVZ Use a Gaussian, and give the half-width of the Cerenkov cone at 1 GHz as 3. 72 ° for a 1 Pe. V (3. 1 m) shower. Determine Gz as FT of gaussian

Scaling vs AVZ Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Field calculation is integral over shower profile Separation of phase factors 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 Gy Red – Griessen for f(z)

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 G 4

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

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

Askaryan pulses, UCI, Apr 9, 2005 (Seckel) Scaling model w/Shahid’s G 4 10 Te. V 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?

Acoustic (in progress) Askaryan pulses, UCI, Apr 9, 2005 (Seckel) • 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