12-20 July 2017
BEXCO
Asia/Seoul timezone
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Contribution

BEXCO - Room A(101/102)

[CRD081] The TUS space experiment: calibration in flight

Speakers

  • Alexandr VOLVACH

Primary authors

Description

The TUS space experiment is aimed to study the energy spectrum and arrival direction of Ultra High Energy Cosmic Rays (UHECR) at E ~ 10^20 eV by measuring the fluorescence yield of EAS in the atmosphere. The "Lomonosov" satellite, with TUS, was launched at the April 16, 2016. Satellite now is in orbit and fully operational. The TUS collaboration plans to design and produce a ground-based system of light sources for the in-flight calibration of the TUS detector. Two types of the possible UV light sources are presently under consideration for this purpose: LEDs and laser stations. The design and fabrication of the TUS ground-based calibration light source prototypes based on LedEngin-LZ4-00U600 LEDs and on the use of the "Simeiz-1873" laser stations are presented. At the first stage of the transmitter transformation, it is necessary to make changes to the optical scheme of the laser emitter: 1). To provide the necessary UV-range, it is required to introduce a third-harmonic generator (THG) into the radiator circuit, it can be obtained by combining two SHG crystals (355 nm). 2). The optics of the range finder telescope should be adapted to the UV range. For the compression of the pulse, the SBS is included in the circuit; it is a compressor, MF, and two amplification cascades on YAG Nd + 3, and SHG provides radiation at a wavelength of 532 nm. Other calibration options are being studied: the use of signals from cosmic-ray interactions in the UV filter ahead of the photomultiplier, as well as other terrestrial sources of a different nature.