1. Working Group Summary: New Techniques (Really, Just Askarayan’s Techniques)
David Saltzberg (UCLA)
David Waters (UCL) [Summary by Justin Vandenbrouke (UCB)]
Panel Discussion Leader: Albrecht Karle (UW)
TeV Astrophysics Workshop, II
August 31, 2006
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2. Gurgen Askaryan (1928-1997) Yesterday’s topics Many Ideas:
Radio Detection of UHE 
Acoustic Detection of UHE 
Laser Ablation
Bubble Chamber
Yesterday’s
topics
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3. UHE Neutrinos are Here (we just have to find them)
GZK with protons:
GZK with nuclei:
~1019 eV
(NOT a typo)
neutrinos +
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4. More Particle Physics: z=1 is a VERY long baseline
One experimental parameter: (L/E)|lab-frame / ~tproper-time determines (largely) the sensitivity to m2, decays, decoherence…
available ?
Decays alter flavor ratios:
Beacom,Bell,Hooper,Pakvasa,Weiler, PRL 90, (2003)
Recent review: Pakvasa, Phys. Atom. Nucl., 67, 1154 (2004)
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5. Predgrag Miocinovic: Frequency + Phase  Reconstruct time domain pulse
Reconstructed signal is a brief, unresolved, bipolar pulse of radiation
Details of analysis in PRD 74, (2006)
Even more data from June 2006 ice run
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6. Steve Barwick: ARIANNA “span the energy gap”
ARIANNA rates
(6 month)
ESS Fe-only
~40 few
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7. Gary Varner AURA How does radio-array sensitivity compare to ARIANNA?
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8. Westerbork Experiment
4 freq. bands
4 freq. bands
Westerbork Synthesis Radio Telescope
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9. WRST Expected Sensitivity
Cosmic Rays
Neutrinos
GZK ν´s
TDs
Scholten et al. (NuMoon Collab.) 2006, Astropart. Phys., in press
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10. Fabrice Feinstein & Gary Varner Advanced Front-End Electronics Design
Specfications:
High bandwidth (>1 GHz)
Low noise (thermal)
Fast (> GSa/s)
Low Power
High dynamic range: bits
<1% cross talk
Deep digital buffers
Self-Triggering capability
But need them cheap
Fabrice will put a full comparison in the proceedings
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11. Conclusions GZK neutrinos are a beam for particle physics as
well as astronomers
In 1-5 years, we may have a handful of events, but
we need ~ for science
Next generation plans await attenuation length
measurements, emission strengths, background
surveys---many this upcoming season
Meanwhile, work on detector technology, especially front-end hardware proceeds apace.
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