IceRay: an IceCube-Centered Radio GZK Array John Kelley for Bob Morse and the IceRay collaboration April 30, 2008.

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Presentation transcript:

IceRay: an IceCube-Centered Radio GZK Array John Kelley for Bob Morse and the IceRay collaboration April 30, 2008

Goals Extend IceCube into the EeV range via a radio array –50 km 2 (initial phase) to km 2 (final target) –substantial rates of GZK / year O(1º) angular resolution Subset of events which trigger both radio and optical arrays –Allows calorimetry of both shower and outgoing lepton Low cost (<$10M)

The IceRay Collaboration Hawai’i: B. Morse, P. Allison, M. DuVernois, P. Gorham, J. Learned, and G. Varner Kansas: D. Besson Wisconsin: A. Karle, F. Halzen, and H. Landsman Ohio State: J. Beatty Maryland: K. Hoffman Delaware: D. Seckel Penn State: D. Cowen and D. Williams MIT: I. Kravchenko Taiwan: P. Chen UCL: R. Nichol and A. Connolly

50 km 2 Baseline Studies (the “AMANDA” of radio) Higher density, shallow (50m) vs. sparse, deep (200m)

Frequency Range Ice is better at low frequency (< 500 MHz) Solid angle also better at low freq. SNR goes as sqrt(bandwidth) Go low freq., high bandwidth: MHz

Depth Firn shadowing: shallow rays can’t get to surface Means deeper is better for V eff  (up to ~200m) Cost is the real issue –Deep firn drill?

Simulation Results Mostly via SalSA MC; crosschecked with Bartol, RICE MC, and ARIANNA MC IceRay-36 / shallow IceRay-18 / deep

Acceptance and Event Rates Initial phase achieves 3-9 ev/year for “standard” fluxes Final phase: ~100 ev/year

“Golden” Hybrid Events Triggering both IceRay and IceCube: rates are low, but extremely valuable for calibration High-energy extension (IceCube+ above) with 1.5km ring helps a lot Sub-threshold cross- triggering can also help IceRay-36 / shallow

Proposed Schedule : IceRay-0 –surface testbed… see next talk! : Two surface substations, 50-80m with existing or slightly modified firn drill : Start installation of initial-phase array as IceCube ramps down

Extra Slides

Simulation Details –Throw events over 6 km radius disk, 300m to 2500m depth – MHz bandwidth for each antenna, low gain (dipole- like response) –12 antennas (6 H pol, 6 V pol ) per station –> 4  on 5 antennas required to trigger (to ensure near 100% reconstruction efficiency), use T sys ~ 360K (230K ice +130K receiver) –Exclude shallow zenith angles due to firn refraction shadowing

Ray Tracing 50m200m

Ray Tracing, cont. 400m1km