The Askaryan Radio Array (ARA)
The Askaryan Radio Array has developed the hardware and analysis techniques required to realize an observatory scale array for the detection of ultra high energy neutrinos in the radio frequency detection channel, while also delivering world competitive limits on the high energy neutrino flux. The first ARA instrumentation was installed in the Antarctic ice cap near the geographic South Pole over a decade ago. The addition of each new cluster of antennas in the ice brought improvement and innovation. The final installation in the austral summer of 2017-2018 included a "phased array" trigger which demonstrated the ability to increase the trigger efficiency using interferometric information in real time. ARA's detailed in situ measurements of the propagation of radio frequency signals in the ice have established the polar ice cap as an ideal host for such an array, while informing the reconstruction and simulation of in ice events. With five deep radio antenna clusters are currently operating at the South Pole, current ARA results boast world competitive sensitivity to ultra high energy neutrinos, while the data currently on disk holds the promise of extending these results to lower fluxes in the near future. Following on the success of ARA, two new embedded in ice arrays have been planned, RNO-G and IceCube Gen2.
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