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Cosmic ray oriented performance studies for the JEM-EUSO first level trigger
Abdellaoui, G.,Abe, S.,Acheli, A.,Adams Jr., J.H.,Ahmad Jr., S.,Ahriche Jr., A.,Albert Jr., J.-N.,Allard Jr., D.,Alonso Jr., G.,Anchordoqui Jr., L.,Andreev Jr., V.,Anzalone Jr., A.,Aouimeur Jr., W.,Ar Elsevier BV * North-Holland 2017 Nuclear Instruments & Methods in Physics Research. Vol. No.
<P><B>Abstract</B></P> <P>JEM-EUSO is a space mission designed to investigate Ultra-High Energy Cosmic Rays and Neutrinos ( E > 5 ⋅ 1 <SUP> 0 19 </SUP> eV ) from the International Space Station (ISS). Looking down from above its wide angle telescope is able to observe their air showers and collect such data from a very wide area. Highly specific trigger algorithms are needed to drastically reduce the data load in the presence of both atmospheric and human activity related background light, yet retain the rare cosmic ray events recorded in the telescope. We report the performance in offline testing of the first level trigger algorithm on data from JEM-EUSO prototypes and laboratory measurements observing different light sources: data taken during a high altitude balloon flight over Canada, laser pulses observed from the ground traversing the real atmosphere, and model landscapes reproducing realistic aspect ratios and light conditions as would be seen from the ISS itself. The first level trigger logic successfully kept the trigger rate within the permissible bounds when challenged with artificially produced as well as naturally encountered night sky background fluctuations and while retaining events with general air-shower characteristics.</P>
Ahmad, D,Choi, W J,Seo, Y I,Jung, S-G,Kim, Y C,Salem-Sugui Jr, S,Park, T,Kwon, Y S IOP Publishing Ltd 2017 Superconductor science & technology Vol.30 No.10
<P>We investigate the doping dependence of flux pinning in superconducting NaFe<img ALIGN='MIDDLE' ALT='${}_{1-x}$' SRC='http://ej.iop.org/images/0953-2048/30/10/105006/sustaa7ec3ieqn3.gif'/>Co<SUB> <I>x</I> </SUB>As (<I>x</I> = 0.01, 0.03, 0.05 and 0.07) single crystals grown by the Bridgman method. The electronic specific heat displays a pronounced anomaly in a sample series at superconducting transition temperature, which hardly shows any residual part at low temperature. We found that Co doping plays an important role in signifying the secondary peak in the magnetic hysteresis of optimally doped (<I>x</I> = 0.03) and heavily doped (<I>x</I> = 0.05, 0.07) crystals. Furthermore, the dependence of the relaxation rate <I>S</I> = ∣d ln <I>M</I>/d ln <I>t</I>∣ on magnetic field and temperature exhibits a decreasing trend within a certain range corresponding to the secondary peak effect in the optimally and heavily doped samples. The magnetic relaxation rate combined with the Maley analysis of the current-dependent creep energy shows a single-vortex pinning in the lightly doped sample dominant at low applied fields, and plastic pinning at high applied fields, without showing a secondary peak. However, in the optimally and heavily doped samples, the magnetic relaxation rate and <I>U</I>(<I>J</I>) isothermal analysis show that the collective pinning that dominates below <I>H</I> <SUB>peak</SUB> crosses over to plastic pinning for fields above <I>H</I> <SUB>peak</SUB>.</P>
Performances of JEM-EUSO: angular reconstruction : The JEM-EUSO Collaboration
Adams Jr., J. H.,Ahmad, S.,Albert, J. -N.,Allard, D.,Anchordoqui, L.,Andreev, V.,Anzalone, A.,Arai, Y.,Asano, K.,Ave Pernas, M.,Baragatti, P.,Barrillon, P.,Batsch, T.,Bayer, J.,Bechini, R.,Belenguer, Springer-Verlag 2015 Experimental astronomy Vol.40 No.1