ANtarctic Impulsive Transient Antenna NASA funding started 2003 for first launch in 2006 Phase A approval for SMEX ToO mission 600 km radius, 1.1 million.

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Presentation transcript:

ANtarctic Impulsive Transient Antenna NASA funding started 2003 for first launch in 2006 Phase A approval for SMEX ToO mission 600 km radius, 1.1 million km 2

ANITA concept

ANITA-lite Electronics 2 Receiver Horns Piggyback on TIGER Launch Dec ‘03 RF Survey of Antarctica

ANITA-lite prior to WF 2 Receiver Horns Boss Truck

ANITA-lite flight path 03/04 18 days at float altitude 1.25 revolutions, landing near Mawson Station Data recovered in Feb 04

ANITA-lite timing resolution  t =0.12 ns per Antenna Azimuth Angle Expected Angular Resolution for ANITA  ~ 0.5 deg  ~ 2 deg Ground antenna transmits calib. pulse to  t= t ANT1 -t ANT2

ANITA-lite BG event Initial scan of data reveals no obvious signal Ant 1 - Horizontal Ant 1 -Vertical Ant 2 - Horizontal Ant 2 - Vertical Duration is too large for - associated with local TRX ~Signal 512ns

Ice Attenuation at South Pole - from 200MHz to 700MHz Steve Barwick -Jan Exponential Tapered Pyramidal Horn Horns provided by D. Besson D. Besson, S. Churchwell, J.Nam, P. Gorham

Ice Attenuation at South Pole - from 200MHz to 700MHz A clean reflection from the bottom implies that the attenuation lengths are very long! Typically 40k triggers Stable T0 400ns wide Lecroy WavePro Gsa/s 50 us window

Ice Attenuation at South Pole - from 200MHz to 700MHz Most of Antarctic ice is -50C! Excellent transparency, compare to ~100 meter for light, it is 10x larger

Schedule for ANITA 03/04 Fly ANITA-lite, measure attenuation length in ice 04Recover ANITA-lite, analyze data, begin construction 05Jan :Begin assembly and integration June: test partial instrument in New Mexico, mechanical Aug: Begin final integration and testing 06June: NSBF integration in Palestine, TX Sept: Ship to Antarctica Dec : Launch ANITA payload from McMurdo, Antarctica 07Jan : Recover payload, ship back to ConUS

Summary ANITA-lite successfully demonstrated the performance of many ANITA subsystems - e.g., timing resolution 0.12ns per antenna Initial inspection of ANITA-lite data reveals: - No unexpected sources of narrowband RF background events - No obvious neutrino signals, but still early Attenuation length ~1.5 km at -50C, more than 10x optical Anticipated launch of ANITA: Dec 06

Ice transparency - ideal Loss tangent a strong function of temperature For cold ice, UHF (0.1- 1GHz) best Antarctic data approaches pure ice values L  =  [  n (  ’’ /  ’ )] –1 ~ 6 km at 300 MHz & -60C (pure ice) Matsuoka et al Polar Ice near surface=-50C 1/f  ’’] -1 ~[1/f] -1 ~f L  ~ constant for f < 500 MHz Arrows: f for RF attenuation studies

Ice Attenuation at South Pole - from 200MHz to 700MHz Steve Barwick -Jan. 2004

Shower profile observed by radio (~2GHz) Measured pulse field strengths follow shower profile very closely Charge excess also closely correlated to shower profile (EGS simulation) Polarization completely consistent with Cherenkov Sub-ns pulse, Ep-p~ 200 V/m! simulated shower curve 2GHz data Reflection from side wall 100% polarized In proper plane

Steve Barwick -Jan KU Dipole UH Slotted Weatherport New Station v4.0

New results—SLAC T460 June 2002 Follow up experiment to SLAC T444, with rock-salt target Much wider energy range covered: –<1PeV up to 10 EeV Radio Cherenkov observed over 8 orders of magnitude in radio pulse power