Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena ARENA 2008 A radio air shower detector to extend IceCube ● Three component air shower detector ● Radio air shower detector as a veto for EHE ● South Pole radio background measurements ● Background measurements with RICE DAQ

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena IceCube/IceTop

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena Primary goal: A three component air shower detector Air shower IceTop IceCube IceCube: Muon detection IceTop: Energy reconstruction Radio: Longitudinal development And there are other applications…

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena EHE analysis: Simulation of light deposit in IceCube (NPE) Overlap region of IceTop “what we have” Cut value for EHE analysis depending on the amount of light in the detector given by the number of photo electrons (NPE) Background by air showers GZK neutrinos How to get a detector for horizontal showers to be sensitive to more GZK ’s? lost flux still strong background signal

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena A large area radio air shower detector Is the detector working as a background veto for EHE analysis? What is the energy threshold to detect air showers with radio? Antenna rings around IceTop with increasing radius up to e.g. 3km

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena First radio background studies at South Pole 06/07 AMP Cable Antenna scope J. Auffenberg et al. ICRC 2007

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena Air shower in 125m distance with 45° inclination angle simulated with REAS2 What is the light deposit in IceCube of a 10 PeV air shower? J. Auffenberg et al. ICRC 2007 (More about Tim Huege’s REAS: Sim. and Theory of Radio Emission in Air)

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena GZK analysis Energy threshold of a possible radio air shower detector! NPE cut of EHE analysis Aya Ishihara MC data Remaining background Detection Region Antenna rings around IceTop with increasing radius up to e.g. 3km

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena Background measurements with RICE DAQ 2 Antennas are deployed on roof of the MAPO building Sampling rate: 1GHz Test measurement Frequency in MHz ADC counts (See also: Status of the Radio Ice Cherenkov Exp. by Daniel Hogan)

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena dB amplification (MITEQ AU-1464) SPASE AMANDA 2 Cables (SPASE) AMANDA DAQ Building (MAPO) Antenna Positions 125m The next steps Transient noise and background measurements on different time scales (second, hour, day)

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena Air shower detection with radio at the South Pole Detector efficiency depends on many parameters: ● Height ● Magnetic field ● Radio backgroundcoming soon ● Antenna configuration coming ● Antenna field configurationcoming next Promising tool to improve EHE analysis of IceCube.

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena Thanks for listening!

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena Medial amplification of the antenna Field strength distribution at 20MHz from Simulation In the simulation (EZNEC) implemented antenna Field strength distribution at 60MHz Medial antenna amplification in dB 3m monopol Snow Frequency in [MHz] Medial amplification properties of the antenna

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena Air showers NPE Primary Energy in log(GeV) log(NPE) # events NPE about 10 3 for a 5 PeV air shower is a promesing Veto property! Veto for Air showers with energies > 5PeV NPE cut level would be decresed by more than one order of magnitude! Increases the detection probability of GZK neutrinos with lower NPE Will be studied in more detail

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena System check with RICE Readout methods: Surface antennas (amplitude trigger) MinBias Trigger every 8min RF Signal at 453 MHz Similar to Monopole measurements! Frequency in MHz

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena Background measurements with RICE DAQ Amanda2 Surface antennas No IceTop GPS! Amplitude trigger Together with In-Ice Antennas

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena Outlook ● Separations analysis of air shower- und high energy Neutrino induced Myons in IceCube ● Evaluation of the optimal detector configuration ● Four Antenna test array with IceTop time stamp ● Detection limit of some PeV is possible

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena Nachweis LOPES/LOFAR Karlsruhe Germany (Nature, 435:313–316, May 2005)

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena Air showers as EHE  background overlap region with IceTop

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena Synchrtron effect in earths magnetic field B-Field ● Geo-synchrotron effect: electro magnetic charged particles in earths magnetic field ● Short radio pulses in time (length: few 10ns) ● Broat in frequency (1-150 MHz)

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena Air showers  bundle properties Initial air shower spectrum: (1,5 Mio events) Standard IceCube Composition for Corsica in Ice, MC simulation # events Energy log(eV) After SMT8

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena Untergrundmessungen mit RICE Neue Antennen Nahe MAPO

Bergische Universität Wuppertal Jan Auffenberg et al. Rome, Arena LPDA vs. Monopol