Workshop Opening & Motivation Highlights

• Arman Tursunov & Piotr Homola

Room: Room 425 (4th floor) Workshop Opening & Motivation Highlights

Michal Niedzwiecki / Machine Learning methods for classification cosmic-ray events State of art, our plans and conception of usage the machine learning and reinforcement learning for classification of cosmic-ray events from CREDO database.

Alexander Ayriyan / Heterogeneous computing platform HybriLIT Heterogeneous computing platform HybriLIT is a part of the Multifunctional information and computing complex (MICC) of the Laboratory of Information Technologies of JINR. The platform consists of “Govorun” supercomputer and HybriLIT cluster as an education, scientific and testing polygon. It is based on heterogeneous structure of computation nodes and allows developing parallel applications for carrying out data analysis and computation using various computing architectures such as multicore CPUs, Intel Xeon Phi co-processors, and NVIDIA (Tesla K40, K80, V100) GPUs. Therefore, the platform provides the unified software and information environment and ecosystems for parallel computations and for ML/DL. It also provides a possibility to hold tutorials in parallel programming technologies that help students and scientists to learn new computing architectures.

CREDO Collaboration highlights & discussion starter: Piotr Homola Collaboration Meeting: only for CREDO contributors.

Visegrad project implementation highlights & discussion starter: Arman Tursunov Visegrad Project Meeting: for V4 project members and CREDO contributors.

Robert Kamiński / CREDO project (online talk) The Cosmic-Ray Extremely Distributed Observatory (CREDO) is a project created a few years ago in the Institute of Nuclear Physics PAS in Krakow and dedicated is to global studies of extremely extended cosmic-ray phenomena. The main reason for creating such a project was that the cosmic-ray ensembles are beyond the capabilities of existing detectors and observatories. Until now, cosmic ray studies, even in major observatories, have been limited to the recording and analysis of individual air showers therefore ensembles of cosmic-rays, which may spread over a significant fraction of the Earth were neither recorded nor analyzed.

David Alvarez Castillo / Ultra High Energy Cosmic Rays produced by compact star mergers and pulsars In this talk I shall review a few mechanisms of ultra high energy cosmic rays produced by the merger of compact objects, supernovae infall into magnetars, formation of hybrid compact stars and emissions from pulsars. Moreover, I will discuss the physical implications of these processes within the framework of CREDO detections.

Arman Tursunov / Acceleration of ultra-high-energy cosmic rays by supermassive black holes Production and acceleration mechanisms of ultra-high-energy cosmic rays (UHECRs) with energy exceeding EeV remain unclear. Energy range of UHECRs beyond the GZK-cutoff limit points to exotic nature of the phenomena. I will show that extraction of rotational energy of a black hole by the novel, ultra-efficient regime of the magnetic Penrose process could indeed foot the bill. Ionization of particles, such as beta-decay of neutron, skirting close to the black hole horizon energizes protons to over 10^20 eV. It is remarkable that the process requires neither extended acceleration zone, nor fine-tuning of accreting matter parameters. Further, this leads to a certain verifiable constraints on the black hole mass and magnetic field strength as UHECRs sources. Applied to the Galactic center supermassive black hole we have proton energy of orders coinciding with the knee of the cosmic ray spectra. I will also discuss the results of numerical studies related to the acceleration of primary cosmic rays and energy losses along the propagation distance.

Oleksandr Sushchov / Simulation of formation and propagation of cosmic-ray ensembles : status and perspectives

Kevin Almeida Cheminant / Search for ultra-high energy photons through the preshower effect with CTA telescopes As ultra-high energy photons (EeV and beyond) propagate from their sources of production to Earth, radiation-matter interactions can occur, leading to an effective screening of the incident flux. In the ultra-high energy domain, photons can undergo e+ /e− pair production when interacting with surrounding geomagnetic field, which in turn can produce cascade of electromagnetic particles called preshower. Such cascade can initiate air showers in the Earth’s atmosphere that gamma-ray telescopes, such as the next-generation gamma-ray observatory Cherenkov Telescope Array, can detect through Cherenkov emission. We study the feasibility of detecting such phenomena using Monte-Carlo simulations of nearly horizontal air showers for the example of the La Palma site of the Cherenkov Telescope Array. We investigate the efficiency of multivariate analysis in correctly identifying preshower events and cosmic ray dominated background. The effective area for such kind of events are also investigated and event rate predictions related to different ultra-high energy photons production models are presented.

Anna Kowalewska / Short description of simultaneous detection of two ∼TeV photons - new channel for DM search (online talk) online talk

Tadeusz Wibig / The First CREDO Registration of Extensive Air Shower We have described the CREDO-Maze mini array with four CosmicWatch detectors. We show that this simple and affordable apparatus is able to register the Extensive Air Showers and it can be used to study cosmic rays much more effectively that the simple two-detector CosmicWatch muon telescope station. The further development direction is indicated.

Paweł Jagoda / Numerical simulations of Extensive Photon Cascades and study of their signatures in the Cosmic-Ray The cosmic ray research has been so far focused on investigating single air showers. In contrast, the CREDO project is dedicated to studying extremely distributed cosmic ray phenomena, so-called Super-PreShowers. If photons constitute a fraction of ultra-high energy primary particles, on their way through space they may initiate cascades comprising thousands of secondary elements. The simulation package developed attempts to model possible signatures of those events which we expect to observe in the extremely distributed observatory. The model of cascade development employed is governed by a simple probabilistic scenario, which gives similar results in terms of the number of particles and spatial dispersion as anticipated in real experiment. The presented visualisation tool provides signature maps of events that occur in remote locations. The signature maps are designed to be comprehensible to citizen scientists. The resulting map images are made available through the Dark Universe Welcome project. Undoubtedly, both detection as well as non-detection of such an event will extend our knowledge of Universe.

Szabolcs Jakab / LOBA / CREDO expertise intro: science communication (online talk) Online talk

Silvia Lorenzo Perez / CREDO expertise intro: ethics (online talk) Online talk

Probablility of detecting cosmic-ray cascades by simple CREDO detectors - How to work effciently with students? (online talk)

• Krzysztof Wozniak (Institute of Nuclear Physics PAS, Krakow, Poland)

Room: Seminar Room, 4th floor

Jacek Gębala & Kacper Lawera / Astronomy Club Almukantarat

Discussion: CREDO & H2020 SwafS applications Chair: Piotr Homola

Discussion: Visegrad implementation plan Chair: Arman Tursunov

Krystian Batyjewski / Playing with the Universe Audiovisual, interactive art performance powered by CREDO - one of the main drivers for the CREDO mission.

Krystian Batyjewski & Piotr Homola / CREDO citizens discussion highlight: a global performance

Sławomir Stuglik / "Particle Hunters" competition and status of work on the user interface of the CREDO project I would like to present information about the "particle hunters" competition in Poland, and show the status of work on the user interface being developed by me.

Szymon Ryszkowski / CREDO citizens & gamification: board games

Discussion: CREDO Collaboration - vision, strategy & next steps Chair: Piotr Homola

Discussion: Visegrad implementation - practical conclusions / to do list Chair: Arman Tursunov