By Matthew Joseph Mottram
The winner of UCL's annual HEP thesis prize, this paintings describes an research of the knowledge from the second one flight of the Antarctica Impulsive temporary Antenna (ANITA). ANITA is a balloon-borne test that searches for radio signs originating from ultra-high strength neutrinos and cosmic rays interacting with the Antarctic ice or air. the hunt for ultrahigh power neutrinos of astrophysical starting place is likely one of the striking experimental demanding situations of the twenty first century. The ANITA test was once designed to be the main delicate software to ultra-high power neutrinos that originate from the interactions of cosmic rays with the cosmic microwave historical past. The method and result of the neutrino and cosmic ray searches are awarded within the thesis.
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Extra resources for A Search for Ultra-High Energy Neutrinos and Cosmic-Rays with ANITA-2
2 Analogue Processing Signals received by the ANITA-2 antennas were amplified and filtered close to the antenna output. By amplifying signals close to the antenna, thermal noise contamination and transfer losses in cables are vastly reduced. Amplification, via low-noise amplifiers (LNAs) and 200–1200 MHz filtering of HPOL channels took place in Radio Frequency Conditioning Modules (RFCMS). The RFCMs contained all modules in Faraday housing to ensure no exterior interference and were situated close to the antennas, with ∼1 m of LMR-600 coaxial cable between antenna output and RFCM.
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15: • • • • Low: 200–350 MHz Mid: 350–700 MHz High: 600–1,150 MHz Full: 150–1,250 MHz The filtered sub-band channel signals were then passed through a tunnel diode, also situated in the SHORT. The tunnel diode effectively acted as a square law detector and output a unipolar pulse that tracked the power passed through the diode. The SHORT outputs were then fed into a field-programmable gate array (FPGA), mounted on the relevant SURF board for the channel in question. Within the FPGA, signals passed through a discriminator; any signal exceeding the discriminator’s threshold resulted in a positive trigger logic output which remained high for ∼10 ns.
A Search for Ultra-High Energy Neutrinos and Cosmic-Rays with ANITA-2 by Matthew Joseph Mottram