By Matthew Joseph Mottram
The winner of UCL's annual HEP thesis prize, this paintings describes an research of the information from the second one flight of the Antarctica Impulsive brief Antenna (ANITA). ANITA is a balloon-borne test that searches for radio indications originating from ultra-high strength neutrinos and cosmic rays interacting with the Antarctic ice or air. the hunt for ultrahigh strength neutrinos of astrophysical beginning is among the impressive experimental demanding situations of the twenty first century. The ANITA scan was once designed to be the main delicate device to ultra-high strength neutrinos that originate from the interactions of cosmic rays with the cosmic microwave heritage. The technique and result of the neutrino and cosmic ray searches are provided within the thesis.
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Extra info for A Search for Ultra-High Energy Neutrinos and Cosmic-Rays with ANITA-2
Calibration signals were sent from the Williams Field borehole on four separate passes and from the surface antenna on three passes (one of which was immediately after launch); pulsing activities ceased on 8th January 2009. 2 Performance ANITA-2 had a successful flight when compared with ANITA-1, which suffered large amounts of dead-time due to necessary rebooting of the flight computer and high 52 4 The Antarctic Impulsive Transient Antenna Fig. 25 Photograph taken by Brian Hill shortly after arriving at the ANITA landing site buffer occupancy when close to human bases.
The signals for each channel were split and fed into four parallel LABRADOR chips, mounted on the SURF. In addition to the eight RF channels, the LABRADOR had a ninth channel for a common 125 MHz clock. The LABRADOR chips contained a two hundred and sixty element switched capacitor array (SCA) for each of the nine input channels. 6 Gsa/s until the issue of a trigger command, at which time sampling on the one set of SCAs was frozen and read out into a digitizer. 3 Radio Frequency Signal Chain 43 bits of dynamic range.
7 were measured prior to the flight of ANITA-1 in an anechoic chamber . 3 Radio Frequency Signal Chain -10 -15 -15 -20 -20 -25 -10 200 400 600 800 1000 1200 Frequency (MHz) 1400 -25 200 400 600 800 1000 1200 1400 Frequency (MHz) Fig. 10 Results of the antenna S11 testing for HPOL (left) and VPOL (right), central green is the average response, upper and lower red are the maximum and minimum response respectively analyser. 10 displays the results of these checks, with the response fairly uniform between antennas.