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Search Results: 1 - 10 of 12284 matches for " JEM-EUSO Collaboration "
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The JEM-EUSO Mission: Contributions to the ICRC 2013
The JEM-EUSO Collaboration
Physics , 2013,
Abstract: Contributions of the JEM-EUSO Collaboration to the 33rd International Cosmic Ray Conference (The Astroparticle Physics Conference) Rio de Janeiro, July, 2013.
The Jem-Euso Mission
Yoshiyuki Takahashi,the JEM-EUSO Collaboration
Physics , 2009, DOI: 10.1088/1367-2630/11/6/065009
Abstract: JEM-EUSO is a space science mission to explore extreme energies and physics of the Universe. Its instrument will watch the dark-side of the earth and will detect UV photons emitted from the extensive air shower caused by an Ultra-High Energy Cosmic Rays (UHECRs above 10^18 eV), or Extremely High Energy Cosmic Ray (EHECR) particle (e.g., above about 10^20 eV). Such a high-rigidity particles as the latter arrives almost in a straight-line from its origin through the magnetic fields of our Milky Way Galaxy and is expected to allow us to trace the source location by its arrival direction. This nature can open the door to the new astronomy with charged particles. In its five years operation including the tilted mode, JEM-EUSO will detect at least 1,000 events with E>7x10^19 eV with the GZK cutoff spectrum. It can determine the energy spectrum and source locations of GZK to super-GZK regions with a statistical accuracy of several percent. JEM-EUSO is planned to be deployed by H2 Transfer Vehicle (HTV) and will be attached to the Japanese Experiment Module/ Exposure Facility (JEM/EF) of International Space Station. JAXA has selected JEM-EUSO as one of the mission candidates of the second phase utilization of JEM/EF for the launch in early-to-mid 2010s.
Physics Goals and Status of JEM-EUSO and its Test Experiments
Andreas Haungs,JEM-EUSO Collaboration
Physics , 2015, DOI: 10.1088/1742-6596/632/1/012092
Abstract: The JEM-EUSO mission aims to explore the origin of the extreme energy cosmic rays (EECRs) through the observation of air-shower fluorescence light from space. The superwide-field telescope looks down from the International Space Station onto the night sky to detect UV photons (fluorescence and Cherenkov photons) emitted from air showers. Such a space detector offers the remarkable opportunity to observe a huge volume of atmosphere at once and will achieve an unprecedented statistics within a few years of operation. Several test experiments are currently in operation: e.g., one to observe the fluorescence background from the edge of the Atmosphere (EUSO-Balloon), or another to demonstrate on ground the capability of detecting air showers with a EUSO-type telescope (EUSO-TA). In this contribution a short review on the scientific objectives of the mission and an update of the instrument definition, performances and status, as well as status of the test experiments will be given.
The JEM-EUSO Mission
Toshikazu Ebisuzaki,for the JEM-EUSO Collaboration
Physics , 2011, DOI: 10.7529/ICRC2011/V03/0120
Abstract: The JEM-EUSO mission explores the origin of the extreme energy cosmic rays (EECRs) above 100 EeV and explores the limits of the fundamental physics through the observations of their arrival directions and energies. It is designed to achieve an exposure larger than 1 million km^2 sr year to open a new particle astronomy channel. This super-wide-field (60 degrees) telescope with a diameter of about 2.5 m looks down from space onto the night sky to detect near UV photons (330-400nm, both fluorescent and Cherenkov photons) emitted from the giant air showers produced by EECRs. The arrival direction map with more than five hundred events will tell us the origin of the EECRs and allow us to identify the nearest EECR sources with known astronomical objects. It will allow them to be examined in other astronomical channels. This is likely to lead to an understanding of the acceleration mechanisms, perhaps producing discoveries in astrophysics and/or fundamental physics. The comparison of the energy spectra among the spatially resolved individual sources will help to clarify the acceleration/emission mechanism, and also finally confirm the Greisen-Zatsepin-Kuz'min process for the validation of Lorentz invariance up to {\gamma}~10^{11}. Neutral components (neutrinos and gamma rays) can also be detected as well, if their fluxes are high enough. The JEM-EUSO mission is planned to be launched by a H2B rocket about JFY 2015-2016 and transferred to ISS by H2 Transfer Vehicle (HTV). It will be attached to the Exposed Facility external experiment platform of "KIBO".
Studying individual UHECR sources with high statistics
Gustavo Medina-Tanco,for the JEM-EUSO Collaboration
Physics , 2009,
Abstract: One of the main impacts of the JEM-EUSO mission will come from its unprecedented exposure. This feature creates, for the first time in the field, the possibility of studying individual UHECR sources. However, the intrinsic characteristics of the sources and the injection mechanism, as well as the presence of intervening magnetic fields, present challenges to the identification of isolated sources and to the extraction of their relevant spectral information from the data. We discuss here these aspects in a quantitative way and give an overview of what can be achieved in this regard under different astrophysical scenarios.
The Atmospheric Monitoring system of the JEM-EUSO telescope
S. Toscano,A. Neronov,M. D. Rodríguez Frías,S. Wada for the JEM-EUSO Collaboration
Physics , 2014, DOI: 10.1007/s10686-014-9378-1
Abstract: The JEM-EUSO observatory on board of the International Space Station (ISS) is a proposed pioneering space mission devoted to the investigation of Ultra High Energy Cosmic Rays (UHECRs). Looking downward at the earth's atmosphere with a 60$^\circ$ Field of View (FoV), the JEM-EUSO telescope will detect the fluorescence and Cherenkov UV emission from UHECR induced Extensive Air Showers (EAS) penetrating in the atmosphere. The capability of reconstructing the properties of the primary cosmic ray depends on the accurate measurement of the atmospheric conditions in the region of EAS development. The Atmospheric Monitoring system of JEM-EUSO will continuously monitor the atmosphere at the location of the EAS candidates and between the EAS and the JEM-EUSO telescope. With an UV LIDAR and an Infrared (IR) Camera the system will monitor the cloud cover and retrieve the cloud top altitude with an accuracy of $\sim$ 500 m and the optical depth profile of the atmosphere with an accuracy of $\Delta\tau \leq$ 0.15 and a resolution of 500 m. In this contribution the Atmospheric Monitoring system of JEM-EUSO will be presented. After a brief description of the system, the capability to recover the cloud top height and optical depth and to reconstruct the shower profile will be shown based on satellites data and simulation studies.
JEM-EUSO experiment for extreme energy cosmic ray observation
Blahoslav Pastir?ák,Pavol Bobík,Karel Kudela for the JEM-EUSO collaboration
Physics , 2012,
Abstract: The planned JEM-EUSO (Extreme Universe Space Observatory onboard the ISS Japanese Experimental Module) will measure the energy spectra of cosmic rays up to the range of 1000 EeV and will search for direction to their sources. It will observe the extensive air showers generated in the atmosphere by high energy cosmic ray primary particle from the space. The instantaneous aperture of the telescope will exceed by one order the aperture of the largest ground based detectors. JEM-EUSO apparatus is a large telescope with a diameter of 2.5 m with fast UV camera. Slovakia is responsible for the determination of the UV background, which influences the operational efficiency of the experiment and for the analysis of fake trigger events.
The focal surface of the JEM-EUSO instrument
Y. Kawasaki, M. Casolino, P. Gorodetzky, A. Santangelo, M. Ricci, F. Kajino, T. Ebisuzaki,the JEM-EUSO collaboration
Astrophysics and Space Sciences Transactions (ASTRA) , 2011, DOI: 10.5194/astra-7-167-2011
Abstract: The Extreme Universe Space Observatory on JEM/EF (JEM-EUSO) is a space mission to study extremely high-energy cosmic rays. The JEM-EUSO instrument is a wide-angle refractive telescope in the near-ultraviolet wavelength region which will be mounted to the International Space Station. Its goal is to measure time-resolved fluorescence images of extensive air showers in the atmosphere. In this paper we describe in detail the main features and technological aspects of the focal surface of the instrument. The JEM-EUSO focal surface is a spherically curved surface, with an area of about 4.5 m2. The focal surface detector is made of more than 5000 multi-anode photomultipliers (MAPMTs). Current baseline is Hamamatsu R11265-03-M64. The approach to the focal surface detector is highly modular. Photo-Detector-Modules (PDM) are the basic units that drive the mechanical structure and data acquisition. Each PDM consists of 9 Elementary Cells (ECs). The EC, which is the basic unit of the MAPMT support structure and of the front-end electronics, contains 4 units of MAPMTs. In total, about 1 200 ECs or about 150 PDMs are arranged on the whole of the focal surface of JEM-EUSO.
Sensitivity of orbiting JEM-EUSO to large-scale cosmic-ray anisotropies
Peter B. Denton,Luis A. Anchordoqui,Andreas A. Berlind,Matthew Richardson,Thomas J. Weiler,for the JEM-EUSO Collaboration
Physics , 2014, DOI: 10.1088/1742-6596/531/1/012004
Abstract: The two main advantages of space-based observation of extreme-energy ($\gtrsim 10^{19}$~eV) cosmic-rays (EECRs) over ground-based observatories are the increased field of view, and the all-sky coverage with nearly uniform systematics of an orbiting observatory. The former guarantees increased statistics, whereas the latter enables a partitioning of the sky into spherical harmonics. We have begun an investigation, using the spherical harmonic technique, of the reach of \J\ into potential anisotropies in the extreme-energy cosmic-ray sky-map. The technique is explained here, and simulations are presented. The discovery of anisotropies would help to identify the long-sought origin of EECRs.
Multi Anode Photomultiplier Tube Reliability Assessment for the JEM-EUSO Space Mission
H. Prieto-Alfonso,L. del Peral,M. Casolino,K. Tsuno,T. Ebisuzaki,M. D. Rodríguez Frías,JEM-EUSO Collaboration
Physics , 2015, DOI: 10.1016/j.ress.2014.08.014
Abstract: Reliability assessment in concerned with the analysis of devices and systems whose individual components are prone to fail. This reliability analysis documents the process and results of reliability determination of the JEM-EUSO photomultiplier tube component using the methods 217 Plus. Quantum efficiency degradation and radiation hardness assurance. In conclussion, the levels of damage suffered by the PMTs which comprise the focal surface of JEM-EUSO Space Telescope, are acceptable. The results show as well the greatest contribution to the failure is due to radiation SET. The guaranteed performance of this equipment is a 99.45 per cent, an accepted value of reliability thus fulfilling the objectives and technological challenges of JEM-EUSO.
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