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Your search keyword '"Tavernet, Jean-Paul"' showing total 3 results
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3 results on '"Tavernet, Jean-Paul"'

1. A NECTAr-based upgrade for the Cherenkov cameras of the H.E.S.S. 12-meter telescopes

Author

Ashton, Terry, Backes, Michael, Balzer, Arnim, Berge, David, Bolmont, Julien, Bonnefoy, Simon, Brun, Francois, Chaminade, Thomas, Delagnes, Eric, Fontaine, Gerard, Füssling, Matthias, Giavitto, Gianluca, Giebels, Berrie, Glicenstein, Jean-Francois, Gräber, Tobias, Hinton, Jim, Jahnke, Albert, Klepser, Stefan, Kossatz, Marko, Kretzschmann, Axel, Lefranc, Valentin, Leich, Holger, Lenain, Jean-Philippe, Lüdecke, Hartmut, Lypova, Iryna, Manigot, Pascal, Marandon, Vincent, Moulin, Emmanuel, Murach, Thomas, De Naurois, Mathieu, Nayman, Patrick, Ohm, Stefan, Penno, Marek, Ross, Duncan, Salek, David, Schade, Markus, Schwab, Thomas, Shiningayamwe, Kleopas, Stegmann, Christian, Steppa, Constantin, Tavernet, Jean-Paul, Thornhill, Julian, Toussnel, Francois, and Vincent, Pascal

Subjects
data acquisition, computer: communications, trigger, Cherenkov counter: atmosphere, electrical engineering, programming, HESS, electronics: readout, mechanical engineering, upgrade, photon: detector, performance, detector: design, FPGA, electronics: design
Abstract

Astroparticle physics 118, 102425 - (2020). doi:10.1016/j.astropartphys.2019.102425, The High Energy Stereoscopic System (H.E.S.S.) is one of the three arrays of imaging atmospheric Cherenkov telescopes (IACTs) currently in operation. It is composed of four 12-meter telescopes and a 28-meter one, and is sensitive to gamma rays in the energy range ~ 30 GeV – 100 TeV. The cameras of the 12-m telescopes recently underwent a substantial upgrade, with the goal of improving their performance and robustness. The upgrade involved replacing all camera components except for the photomultiplier tubes (PMTs). This meant developing new hardware for the trigger, readout, power, cooling and mechanical systems, and new software for camera control and data acquisition. Several novel technologies were employed in the cameras: the readout is built around the new NECTAr digitizer chip, developed for the next generation of IACTs; the camera electronics is fully controlled and read out via Ethernet using a combination of FPGA and embedded ARM computers; the software uses modern libraries such as Apache Thrift, ØMQ and Protocol buffers. This work describes in detail the design and the performance of the upgraded cameras., Published by Elsevier Science, Amsterdam [u.a.]

Published
2020
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2. Constraints on the IR background based on CAT spectrum of Mkn 501.

Author

Renault, Ce´cile, Guy, Julien, Aharonian, Felix A., Rivoal, Monique, and Tavernet, Jean-Paul

Subjects
COSMIC background radiation, GAMMA rays
Abstract

The TeV and X-ray data obtained by the imaging Cherenkov telescope CAT and X-ray satellite BeppoSAX during the remarkable flare of Mkn 501 in April 16, 1997 are used to constrain the flux of the Cosmic Infrared Background (CIB) using different CIB models. We show that a non-negligible absorption of γ-rays due to the CIB could take place already in the low-energy (sub-TeV) domain of the spectrum of Mkn 501. The density of the near-infrared background with typical “starlight spectrum” around 1 μm should be between 5 and 35 nW m[sup −2 ] sr[sup −1] (99% CL), with the most likely value around 20 nW m[sup −2] sr[sup −1]. We also argue that the CAT γ-ray data alone allow a rather robust upper limits on the CIB, λF[sub λ] ≤ 60 nW m[sup −2] sr[sup −1] at 1 μm, based on the belief that, within the conventional models of δ-ray production, the differential source spectrum of γ-rays hardly could be flatter than dN/dE ∝ E[sup −1]. The high flux of CIB at ≤ few μm wavelengths, λF[sub λ] ≥ 10 nW m[sup −2] sr [sup −1] implies significant distortion of the initial (source) sub-TeV spectrum of γ-rays from Mkn 501, therefore has a strong impact in derivation of the jet parameters. [ABSTRACT FROM AUTHOR]

Published
2001

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