Neural Network Based Approach to Recognition of Meteor Tracks in the Mini-EUSO Telescope Data

Mini-EUSO is a wide-angle fluorescence telescope that registers ultraviolet (UV) radiation in the nocturnal atmosphere of Earth from the International Space Station. Meteors are among multiple phenomena that manifest themselves not only in the visible range but also in the UV. We present two simple artificial neural networks that allow for recognizing meteor signals in the Mini-EUSO data with high accuracy in terms of a binary classification problem. We expect that similar architectures can be effectively used for signal recognition in other fluorescence telescopes, regardless of the nature of the signal. Due to their simplicity, the networks can be implemented in onboard electronics of future orbital or balloon experiments.Comment: 15 page

Status of the JEM EUSO telescope on International Space Station

International audienceJEM-EUSO is a large telescope looking at the earth from the ISS. It uses a huge volume of the earth's night sky atmosphere in which an extremely energetic cosmic ray particle (E>1019eV) generates a straight-line N2 fluorescence signal on the path of the cascade shower moving at the speed of light for a length of 10-100 km depending on the incident angle. The space-time resolved calorimetry of showers is achieved with a large-aperture Fresnel lens optics and a large-area focal surface of detectors. Such a system in space is capable of detecting thousands of events with energy above 1020 eV (>1000 super-LHC) in a few years of operation on orbit, allowing a particle channel of astronomy and for research of fundamental physics in the universe. Neutrino interaction cross-sections at such high energies are expected to increase in the Standard Model, and EUSO expects a reasonable chance of observing the cosmogenic neutrino events among those detectable showers, because the atmospheric target mass of the EUSO TPC exceeds 1 trillion tons. This experiment JEM-EUSO is currently considered by the Japan Aerospace Exploration Agency (JAXA) for a possible payload on the Japan Experiment Module (JEM) of the International Space Station (ISS)

Mesure précise du rendement absolu de la fluorescence de l'azote dans l'air (conséquences sur la détection des rayons cosmiques d'ultra haute énergie)

PARIS7-Bibliothèque centrale (751132105) / SudocSudocFranceF

A Cockcroft-Walton High-Voltage Power Supply for the EUSO Instruments

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HVPS system for ∗ – EUSO detectors

International audienceIn the JEM-EUSO focal instrument four multianode photomultipliers (Elementary Cell unit) are powered by one high voltage generator. The HV control system for Photo Detection Module consists of 9 high voltage generators. HV generators are Cockcroft-Walton voltage multipliers with protection system and with 3 level very fast switches for HV at cathodes. Protection systems were made to protect HVPS itself against possible excess of power consumption, but might be as well used as a protection of PMTs in case of unexpected enlighting. Externally controlled switches can reduce 100 times or 10000 times the PMT collection efficiency to enlarge the PMT dynamics up to factor 10 6 . The HV control unit provides galvanic insulation of HV system, andallows for input voltage in a range 15-35 V. Control unit provides interface for external voltage setting, control of switches, and emits information about the statuses of 9 HV generators

Using two-photon statistical contribution in the detection of telescopes EUSO

International audienceThe JEM-EUSO (Extreme Universe Space Observatory on Japanese Experiment Module) experiment is about a space telescope that will be installed on the ISS in 2020. The UHECR study aims to improve by a factor of 100 the current measures of Pierre-Auger observatory. The telescope EUSO-Balloon, which was technologically validated in 2014 was the first prototype with the whole chain of detection of telescope JEM-EUSO. SPB-EUSO and MINI-EUSO are the next projects with the same PDM that JEM-EUSO. The principle of detection is based on the capture of individual UV photons which refers to the fluorescence produced by the EAS interaction with Earth's atmosphere. The flow of this fluorescence light is so weak that requires an instrument with 100% efficiency for the detection of one photon and that is the case of EUSO telescopes. This document is a final study of the performance of the telescope EUSO-Ballon. More specifically, a method for information retrieval pixels with weak sensitivity was developed. To achieve this, we use 2-photon contribution on the pulse of an event, as the short-time detection obeys the Poisson distribution. Homogenization of the sensitivity of pixels is critical to trigger algorithms. Also the deterioration of the sensitivity of detection in each channel is inevitable. Thus, this method is useful for recalibration cases, where the sensitivity of one photon’s detection decreases dramatically. As the method uses a curve generated by changing the threshold of discrimination of the measure, it is valid for all EUSO telescopes and it will be most useful in the space, where the manipulation of the instrument is limited