Abstract
Hi-Cal (High-Altitude Calibration) is a balloon-borne experiment that will be launched in December, 2016 in Antarctica following ANITA-IV (Antarctic Impulsive Transient Antenna) and will generate a broad-band pulse over the frequency range expected from radiation induced by a cosmic ray shower. Here, we describe a device based on an array of silicon photomultipliers (SiPMs) for determination of the azimuthal position of Hi-Cal. The angular resolution of the device is about 3 degrees. Since at the float altitude of ∼38 km the pressure will be ∼0.5 mbar and temperature ∼ − 20 °C, the equipment has been tested in a chamber over a range of corresponding pressures (0.5 ÷ 1000) mbar and temperatures (−40 ÷ +50) °C.
Highlights
The ANITA (Antarctic Impulsive Transient Antenna) project is a scientific balloon experiment dedicated to the measurement of ultra-high energy neutrinos and cosmic rays by detection of radiofrequency signals resulting from interactions with molecules in the Earth’s atmosphere and surface ice [1, 2].Since the radio-frequency signals can be detected both directly and as ice reflections, these measurements provide information about the roughness and reflectivity of the Antarctic surface
The ANITA-II [2] and ANITA-III experiments have determined the surface reflectivity at elevation angles of 12-30 degrees by using the Sun as the radiation source, while lower incidence angles have been studied with the external radiation source Hi-Cal-1 (High-Altitude Calibration)
The received ANITA-III signal depends on the relative orientation of the HiCal dipole transmitter relative to the ANITA gondola
Summary
- Novel scintillators and silicon photomultipliers for nuclear physics and applications David Jenkins. - An innovative SiPM-based camera for gamma-ray astronomy with the small size telescopes of the Cherenkov Telescope Array E.J. Schioppa, M. Troyano Pujadas et al. Troyano Pujadas et al This content was downloaded from IP address 129.237.45.171 on 26/10/2018 at 17:04
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