HRJRG on Measurements of Gamma Rays and Charged Cosmic Rays in the Tunka-Valley in Siberia by Innovative New Technologies
This is the wiki space of the Helmholtz Russia Joint Research Group (HRJRG-303) which started in 2012 (see press release).
The HRJRG aims at high-energy gamma-ray astronomy and cosmic ray astrophysics. The projected air-shower detectors will be based on the air Cherenkov technique and the radio detection technique. Institutes Participating institutes are DESY (Zeuthen), KIT (Karlsruhe), University of Hamburg in Germany, as well as the Institute for Nuclear Resear of the Russian Academy of Sciences, the Applied Physics Institute of the Irkutsk State University, and the Lomonosov Moscow State University in Russia.
For the measurements, two extension of the Tunka experiment in Siberia are built: The air Chrerenkov measurements are performed with stations of the HiSCORE experiment, the radio measurements with an array of about 20 antennas called Tunka-Rex.
In Spring, 2014, a review of HRJRG projects, supported by Helmholtz and RFBR (Russian Foundation of Basic Reseacrh) since 2007 has been done. A comprehensive overview is given in this brochure. See page 71-73 (and back-cover) for our project HRJRG-303.
HiSCORE-EA is the first detector phase of this project. It will consist of an array of HiSCORE stations distributed over an area of up to 1 km². The components of HiSCORE-EA will be as close as possible to the final HiSCORE components. Within the HRJRG, we plan to work on proof-of-principle of the detector concept,finalization and optimization of components and array layout, and first physics studies.
Already with the engineering array, it will be possible to address several interesting physics topics.
Tunka-Rex (Tunka Radio Extension)
Tunka-Rex was started in autumn 2012 and completed in September 2013. It consist of 25 antenna stations spread over the area of the Tunka-133 experiment (about 1 km²). The aim of Tunka-Rex is to perform a cross-calibration of the radio signal emitted by cosmic ray air showers with the Cherenkov light of air showers measured with Tunka-133. This cross-calibration allows to determine the energy and mass resolution of cosmic ray radio measurements. Radio measurements can be performed under almost any weather conditions, but Cherenkov light measurements only during clear, moonless nights. Therefore, Tunka-Rex has the potential to increase the duty cycle of Tunka, in particular for cosmic rays with energies above 100 PeV.
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