Abstract
The complex EAS installation of the Tien Shan mountain cosmic ray station which is situated at a height of 3340 m above sea level includes the scintillation and Cherenkov detectors of charged shower particles, an ionization calorimeter and a set of neutron detectors for registering the hadronic component of the shower, and a number of underground detectors of the penetrative EAS component. Now it is intended to expand this installation with a promising method for detecting the radio-emission generated by the particles of the developing shower. The facility for radio-emission detection consists of a three crossed dipole antennae, one being set vertically, and another two – mutually perpendicularly in a horizontal plane, all of them being connected to a three-channel radio-frequency amplifier of German production. By the passage of an extensive air shower, which is defined by a scintillation shower detector system, the output signal of antenna amplifier is digitized by a fast multichannel DT5720 ADC of Italian production, and kept within computer memory. The further analysis of the detected signal anticipates its operation according to a special algorithm and a search for the pulse of radio-emission from the shower. A functional test of the radio-installation is made with artificial signals which imitate those of the shower, and with the use of a N1996A type wave analyzer of Agilent Technologies production. We present preliminary results on the registration of extensive air shower emission at the Tien Shan installation which were collected during test measurements held in Summer 2016.
Highlights
extensive air showers (EAS) signals were found in the frequency range of 30–100 MHz, but the researchers met a number of difficulties in the interpretation of the registered signals which were connected with both insufficient qualities of those days’ electronics and a bad reproducibility of the results because of electromagnetic interferences and weather conditions
The interest in the radio-method of EAS investigation reappeared in the early 2000 s when the experiments CODALEMA (France) [4] and LOPES (Germany) [5] started their work. The availability of this method was proved by the simplicity and low cost of radio devices built using modern electronic modules and perspective application of contemporary information technologies for analyzing the registered data, as well as its effectiveness for the study of EAS events caused by ultra-high energy cosmic ray particles (1019–1020 eV) whose statistics remains rather scarce up to the present time
Every one of the shown distributions is registered with a 4 ns temporal resolution and consists of 10000 sequential measurements of signal intensity which correspond to the full duration of the measured time series of 40 μs
Summary
EAS signals were found in the frequency range of 30–100 MHz, but the researchers met a number of difficulties in the interpretation of the registered signals which were connected with both insufficient qualities of those days’ electronics and a bad reproducibility of the results because of electromagnetic interferences and weather conditions. A convenient place for the development of the radiomethod of EAS particle registration is the Tien Shan mountain cosmic ray station (43◦15 N, 76◦57 E, 3340 m above sea level) whose installations for the complex EAS investigation in the range of primary energies of 1014–1018 eV permit both a direct detection of the charged shower particles [6] at the station’s level, c The Authors, published by EDP Sciences. The description of the experimental installation and preliminary results of the test measurements are the subject of this paper
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