Design of the Second-Generation ARIANNA Ultra-High-Energy Neutrino Detector Systems

• Main Author: Kleinfelder, Stuart A.
• Format: Report
• Language: unknown
• Published: arXiv 2015
• Subjects: Instrumentation and Detectors physics.ins-det; Instrumentation and Methods for Astrophysics astro-ph.IM; FOS Physical sciences; Ross Ice Shelf; Antarc*; Antarctica; Ice Shelf
• Online Access: https://dx.doi.org/10.48550/arxiv.1511.07525; https://arxiv.org/abs/1511.07525

We report on the development of the seven station ARIANNA Hexagonal Radio Array neutrino detector systems in Antarctica. The primary goal of the ARIANNA project is to observe ultra-high energy (>100 PeV) cosmogenic neutrino signatures using a large array of autonomous stations each dispersed 1 km apart on the surface of the Ross Ice Shelf. Sensing radio emissions of 100 MHz to 1 GHz, each station in the array contains RF antennas, amplifiers, a 2 G-sample/s signal acquisition and trigger circuit I.C. (the "SST"), an embedded CPU, 32 GB of solid-state data storage, a 20 Ah LiFePO4 battery with associated battery management unit, Iridium short-burst messaging satellite and long-distance WiFi communications. The new SST chip is completely synchronous, contains 4 channels of 256 samples per channel, obtains 6 orders of magnitude sample rate range up to 2 GHz acquisition speeds. It achieves 1.5 GHz bandwidth, 12 bits RMS of dynamic range, ~1 mV RMS trigger sensitivity at >600 MHz trigger bandwidth and ps-level timing accuracy. Power is provided by the sun and LiFePO4 storage batteries, and the second-generation stations consume an average of 4W of power. The station's trigger capabilities reduce the trigger rates to a few milli-Hertz with 4-sigma thresholds while retaining high efficiency for neutrino signals. : 4 pages, 9 figures, presented at the 2015 IEEE Nuclear Science Symposium