Tunka Radio Extension: Overview and Recent Results
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1 CRI 034 Tunka Radio Extension: Overview and Recent Results Frank G. Schröder for the Tunka-Rex Collaboration Karlsruhe Institute of Technology (KIT), Institut für Kernphysik, Karlsruhe, Germany KIT The Research University in the Helmholtz Association
2 Tunka-Rex Collaboration P.A. Bezyazeekov a, N.M. Budnev a, D. Chernykh a,o. Fedorov a, O.A. Gress a, A. Haungs b, R. Hiller b,e, T. Huege b, Y. Kazarina a, M. Kleifges c, E.E. Korosteleva d, D. Kostunin b, O. Krömer c, L.A. Kuzmichev d, V. Lenok b, N. Lubsandorzhiev d, T. Marshalkina a, R.R. Mirgazov a, R. Monkhoev a, E.A. Osipova d, A. Pakhorukov a, L. Pankov a, V.V. Prosin d, F.G. Schröder b, A. Zagorodnikov a - Tunka-Rex Collaboration a Institute of Applied Physics ISU, Irkutsk, Russia b Institut für Kernphysik, Karlsruhe Institute of Technology (KIT), Germany c Institut für Prozessdatenverarbeitung und Elektronik, KIT, Germany d Skobeltsyn Institute of Nuclear Physics MSU, Moscow, Russia e now at University of Zurich, Switzerland 2 15 July 2017 Tunka-Rex: Overview and Recent Results
3 Tunka-Rex Journal papers Measurement of cosmic-ray air showers with the Tunka Radio Extension (Tunka-Rex) P.A. Bezyazeekov et al. - Tunka-Rex Collaboration, Nucl. Instr. and Meth. A 802 (2015) Reconstruction of air-shower parameters for large-scale radio detectors using the lateral distribution D. Kostunin, et. al (short authorlist), Astropart.Phys. 74 (2016) Radio measurements of the energy and depth of maximum of cosmic-ray air showers by Tunka-Rex P.A. Bezyazeekov et al. - Tunka-Rex Collaboration, JCAP 01 (2016) 052 open access A comparison of the cosmic-ray energy scales of Tunka-133 and KASCADE-Grande via their radio extensions Tunka-Rex and LOPES Tunka-Rex + LOPES Collaborations, Phys. Lett. B 763 (2016) 179 open access 3 15 July 2017 Tunka-Rex: Overview and Recent Results
4 Radio detection of air showers: Geomagnetic emission dominant over Askaryan effect Energy + X max measurements High duty cycle Prog. Part. Nucl. Phys. 93 (2017) 1 arxiv: July 2017 Tunka-Rex: Overview and Recent Results
5 Location of Tunka-Rex in Siberia PPNP 93 (2017) 1, arxiv: July 2017 Tunka-Rex: Overview and Recent Results
6 TAIGA site: Tunka-133 and Tunka-Grande Entrance to muon detector Scintillation counters Inside surface particle detector See also: CRI 216 CRI 265 Tunka-133: PMTs Scintillation counters Inside underground Muon detector Electronic box Tunka-Grande: scintillators of KASCADE-Grande 6 15 July 2017 Tunka-Rex: Overview and Recent Results
7 Layout of Tunka-Rex 1 km² / 3 km² inner / outer area 200 / 20 m spacing between / inside clusters Fully analyzed: Oct 2012 Apr 2014 Year Stations Trigger Tunka Tunka timing issue Tunka Grande Tunka Grande 7 15 July 2017 Tunka-Rex: Overview and Recent Results
8 8 15 July 2017 Tunka-Rex: Overview and Recent Results
9 Signal chain Using data acquisition of Tunka-133 / Tunka-Grande MHz 9 15 July 2017 Tunka-Rex: Overview and Recent Results
10 Reconstruction of Tunka-Rex event Signal-to-noise ratio SNR > 10 required, corresponding to 5% risk of false-positive detection in a single antenna 3 antennas + direction agreement with Tunka-133 required NIM A 802 (2015) July 2017 Tunka-Rex: Overview and Recent Results
11 Best-case example event Correct amplitudes for geomagnetic angle and asymmetry Energy and X max reconstruction tuned against CoREAS Energy: 0.4 EeV Zenith: July 2017 Tunka-Rex: Overview and Recent Results
12 Tunka-Rex vs. Tunka-133 Tunka-Rex tuned against CoREAS (QGSJET II.04) Tunka-133 features independent calibration experimental proof of X max sensitivity! energy precision: 15% X max precision: 40 g/cm² JCAP 01 (2016) July 2017 Tunka-Rex: Overview and Recent Results
13 Comparing scales via radio Tunka-Rex calibrated by same reference source as LOPES Energy scales compared via CoREAS simulations using Tunka-133 and KASCADE-Grande energies as input PLB 763 (2016) July 2017 Tunka-Rex: Overview and Recent Results
14 Result of energy scale comparison PLB 763 (2016) July 2017 Tunka-Rex: Overview and Recent Results
15 Conclusion Tunka-Rex Economic radio extension of the TAIGA cosmic-ray detectors Recently upgraded to higher density and day-time trigger Goal: mass-dependent energy spectrum at ev Achieved results Energy precision of 15 % with 20 % scale accuracy X max precision of 40 g/cm² for high-quality events Energy scales of Tunka and KASCADE-Grande compatible to 10% Poster CRI 155 Improving the Precision and Statistics for X max Poster CRI 195 Efficiency, Exposure, and Aperture of Tunka-Rex July 2017 Tunka-Rex: Overview and Recent Results
16 16 15 July 2017 Tunka-Rex: Overview and Recent Results
17 Amplitude Calibration Same reference source as for LOPES and LOFAR JINST 10 (2015) P July 2017 Tunka-Rex: Overview and Recent Results
18 Arrival direction: Tunka-Rex vs. Tunka-133 Quality cut at 5 to exclude false-positive radio events July 2017 Tunka-Rex: Overview and Recent Results
19 Emission mechanisms in air showers geomagnetic effect ~ 90% Askaryan effect ~ 10% July 2017 Tunka-Rex: Overview and Recent Results
20 Events of first season (Oct 2012 Apr 2013) +: 77 events x: 97 events in 450 hours; E > ev July 2017 Tunka-Rex: Overview and Recent Results
21 Event statistics + Energy Range JCAP 01 (2016) July 2017 Tunka-Rex: Overview and Recent Results
22 Systematic uncertainties in simulations About 10 % due to zenith angle and X max About 10 % difference between p and Fe primaries July 2017 Tunka-Rex: Overview and Recent Results
23 Comparison of energy scales Host experiments Tunka-133 and KASCADE-Grande Energy scales comparable via radio amplitude per energy Small systematic uncertainty due to different observation levels July 2017 Tunka-Rex: Overview and Recent Results
24 Comparison of energy scales Simulations with energy reconstructed by host experiments July 2017 Tunka-Rex: Overview and Recent Results
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