Data obtained with two detectors located at the Tunka Cosmic Ray facility are presented. The Cherenkov light array for registration of extensive air showers (EAS) Tunka-133 collected data during 5 winter seasons since 2009 to 2014. The differential energy spectrum of all particles and the dependence of the average maximum depth on the energy in the range of 6 · 10 15 −10 18  eV measured for 1540 hours of observation are presented.The preliminary all particle energy spectrum by the data of Tunka-HiSCORE prototype array, installed in 2013, is presented. Some additional experiments in the Tunka Valley are briefly described.

В Тункинской долине (республика Бурятия) создается широкоугольная черенковская установка Тунка-HiSCORE, являющаяся частью планируемой комплексной гамма-обсерватории TAIGA и предназначенная для проведения исследований в области гамма-астрономии высоких энергий (>30 ТэВ) и физики космических лучей. В статье приведены первые результаты работы прототипа установки зимой 2013–2014 гг., который состоял из 9 станций, расположенных на площади 0.1 км2. Приведено описание методов обработки, точности восстановления оси ливня, энергии и угла, а также полученный дифференциальный спектр всех частиц КЛ в интервале 2 · 1014 2 · 1016 эВ и его сравнение с имеющимися данными.

The Cherenkov light array for the registration of extensive air showers (EAS) Tunka-133 collected data during 5 winter seasons from 2009 to 2014. The differential energy spectrum of all particles and the dependence of the average maximum depth on the energy in the range of 6 ⋅ 1015–1018 eV measured for 1540 hours of observation are presented.

The Tunka-133 Cherenkov light array for the detection of extensive air showers (EAS) acquires data over the five winters from 2009 to 2014. The direction of arrival, the shower core coordinates on the plane of observation, the primary energy, and the depth of the shower maximum are reconstructed for each EAS. A differential all-particle energy spectrum is obtained in the energy range of 6 × 10 15 –3 × 10 18 eV over 1540 h, along with the energy dependence of the average depth of the shower maximum in the range of 6 × 10 16 –3 × 10 18 eV. Based on this dependence, the variation in the average composition of the primary cosmic rays is estimated as a function of energy.

Черенковская установка для регистрации широких атмосферных ливней (ШАЛ) Тунка-133 набирала данные в течение пяти зимних сезонов с 2009 по 2014 г. Для каждого ливня восстанавливаются направление прихода, координаты оси на плоскости наблюдения, первичная энергия, глубина максимума. Получены дифференциальный энергетический спектр всех частиц в диапазоне энергий 6 · 1015 3 · 1018 эВ за 1540 ч, зависимость средней глубины максимума от энергии в диапазоне 1016 1018 эВ. На основании этой зависимости оценено изменение среднего состава первичных космических лучей с энергией.

The Tunka-HISCORE wide-angle Cherenkov array, one part of the planned TAIGA integrated gamma observatory intended for investigations in the field of high-energy (>30 TeV) gamma-ray astronomy and cosmic-ray physics, is deployed in the Tunka Valley (Buryat Republic). The first results from operating a prototype array composed of nine stations spread over an area of ∼0.1 square kilometers during the winter of 2013–2014 are presented. Data processing techniques are described, along with data on the accuracy of reconstructing the position of a shower’s axis, energy, and angle of arrival. The differential spectrum of all cosmic-ray particles in a shower in the energy range of 2 × 10 14 to 2 × 10 16 eV is presented and compared to the available data.

The EAS Cherenkov light array Tunka-133, with ~3km2 geometric area, is taking data since 2009. The array permits a detailed study of cosmic ray energy spectrum and mass composition in the PeV energy range. After a short description of the methods of EAS parameter reconstruction, we present the all-particle energy spectrum and results of studying CR composition, based on 3 seasons of array operation. In the last part of the paper, we discuss possible interpretations of the obtained results.

The EAS Cherenkov array Tunka-133, with about 3km2 sensitive area, has been installed in the Tunka Valley, Siberia. The accessible energy range is 1015–1018eV. In this contribution, a description of the array and main results obtained so far are presented. A current update of the array includes the deployment of scintillation stations, radio antennas, as well as optical stations. The deployments of these optical stations are the first step towards Tunka-HiSCORE, a wide-angle, large field-of-view gamma-ray telescope.

A new EAS Cherenkov light array, Tunka-133, with similar to 1 km(2) geometrical area has been installed at the Tunka Valley (50 km from Lake Baikal) in 2009. The array permits a detailed study of cosmic ray energy spectrum and mass composition in the energy range 10(16)-10(18) eV with a uniform method. We describe the array construction, DAQ and methods of the array calibration. The method of energy reconstruction and absolute calibration of measurements are discussed. The analysis of spatial and time structure of EAS Cherenkov light allows to estimate the depth of the EAS maximum X-max.The results on the all particles energy spectrum and the mean depth of the EAS maximum X-max vs. primary energy derived from the data of two winter seasons (2009-2011) are presented. Preliminary results of joint operation of the Cherenkov array with antennas for the detection of EAS radio signals are shown. Plans for future upgrades - deployment of remote clusters, radioantennas and a scintillator detector network and a prototype of the HiSCORE gamma-telescope - are discussed. (C) 2012 Elsevier B.V. All rights reserved.

The new EAS Cherenkov array Tunka-133 with about 1 km**2 geometric acceptance area is installed in the Tunka Valley (50 km from Lake Baikal). The array willpermit a detailed study of cosmic ray energy spectrum and mass composition in the energy range of 10**15 - 10**18 eV with uniform method. The array consistsof 19 clusters, each composed of 7 optical detectors with 20 cm PMTs. Since November 2008, the first 12 clusters are in operation, commissioning of the whole array is planned for September 2009 (At the time of submission of this paperto electronic arXiv(February 2010) the completed Tunka-133 array is already taking data). We describe the array construction and DAQ, preliminary results and plans for the future development: deployment of radio-antennas and muon detectors network.