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June 18-20, 2009 Detection of Askaryan radio pulses produced by cores of air showers. Suruj Seunarine, David Seckel, Pat Stengel, Amir Javaid, Shahid Hussain.

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Presentation on theme: "June 18-20, 2009 Detection of Askaryan radio pulses produced by cores of air showers. Suruj Seunarine, David Seckel, Pat Stengel, Amir Javaid, Shahid Hussain."— Presentation transcript:

1 June 18-20, 2009 Detection of Askaryan radio pulses produced by cores of air showers. Suruj Seunarine, David Seckel, Pat Stengel, Amir Javaid, Shahid Hussain D. Seckel, Univ. of Delaware

2 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Topics Concept: –A source to test radio techniques –CR composition ? (not today) Askaryan pulses & air shower dimensions Air shower properties (AIRES & CORSIKA) –Particle content –Radial and energy distributions Calculation of RF signal –Coherent addition of subshowers –Issues: near zone/far zone, ray tracing Composition studies (not today) Detection –IceCube: shallow array, AURA –ANITA (not today)

3 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Theorist’s view of the UHE neutrino sky

4 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Recall how radio works 5 m 10 cm JC, SY: “How do you know when you haven’t seen anything?”

5 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Radio Goals & Staging 100 events/yr above 10 18 eV >1000 km 3 sr Validation of design for field work Prototype projects – more than upper limits Detect Air Showers: Signal/Background/Calib

6 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Askaryan pulses from air shower core

7 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Critical dimensions

8 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) High energy ground level particles at SP CORSIKA/AIRES –Primary energy: 1,10,100,1000 PeV –Cutoff: 1,10,100,1000 GeV –Compositionp & Fe Explore –Particle content rad - meson - baryon - mu –Radial profilesE sh vs r –Shower development dN/dE, ancestry

9 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Ground level particles (above 10 GeV)  e-e-   n,p Radiation fraction increases with primary energy

10 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Radial distributions by particle ID radiating mesons baryons muons

11 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) E vs r (AIRES)

12 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) E vs r (CORSIKA) Fraction of available energy approaches 10% by 100 PeV Scaling allows use of high cutoff

13 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Synthesis of Askaryan pulses Many ground level particles –Superposition Individual RF pulses –Event: (id, t e, x e, n, E) –SubShower:(t s, x s, n, (r,l,s)) –Resolve geometry to antenna –Launch EM pulse(scaled AVZ) –Propagation effects (1/r, attenuation) –Adjust phase to common time basis Response –CoAdd spectra(t, n, pol, (complex spectrum)) –Antenna/DAQ

14 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) RF: (E p = 1 EeV, E cut = 1 TeV )

15 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) RF Cerenkov Rings

16 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) RF vs Core Size – (old)

17 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Characterization of Air Showers 40 10PeV Vertical CORSIKA showers. Hadrons cut. Looked at RF pattern on vertical string of 10 detectors every 10m starting at 200m deep, 150m from shower. A look at waveforms from single 1PeV and 10PeV events. Peaks taken from 10PeV waveforms to determine Cherenkov radiation pattern. Justification for raising the energy cuts.

18 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) 10PeV Waveforms on string

19 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Depth Profiles and Energy Cuts Waveform peaks at depth for 40 10PeV showers. Peak vmax values at different energy cuts.

20 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) RF vs core energy

21 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Parameterize Air Showers Use shower radius (R), shower length (L) and shower size (S) to fit shower radiation patterns. Peaks match up with some variation at the tails. Five event RF detection patterns (solid) with their parameterizations (dashed).

22 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Event Rate Calculation

23 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Shallow Array Concepts Drill 16 x 30m holes –1 dom per hole –4 antennas per dom 2 x 50m cables to each of four nearby strings & SJB 2 doms per cable

24 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) AURA geometry

25 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Summary Test beam for radio sure would be nice Air Shower Cores: E eff ~ 10% E p (at EeV) Synthetic RF looks usable CR Composition Measurement –Core energy anti-correlated with deep-  –p-Fe separation Three scenarios –Small subsurface array w/IceTop –AURA –ANITA

26 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) END

27 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Radial distributions by energy

28 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Sample the Cerenkov Ring

29 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Subshowers & Coherence of RF pulses

30 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Comparison of Fe/p

31 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Determining Cosmic Ray Composition AIRES showers (from S. Seunarine) E sh (r<20 cm) as proxy for radio High-lite: 10 PeV, True iron

32 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) Time Domain Waveforms

33 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) EeV/TeV again

34 Askaryan pulses from air shower cores, UMD Radio Mtg., June 18 2009 (Seckel) 1PeV Waveforms on String

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