Astroparticle Physics

Journal: Astroparticle Physics

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Elsevier

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Publications 1 - 10 of 15

Measurement of the attenuation length of argon scintillation light in the ArDM LAr TPC
Calvo, Javier; Cantini, Cosimo; Crivelli, Paolo; et al. (2018)
Astroparticle Physics
Performance of the MAGIC telescopes under moonlight
MAGIC Collaboration; Ahnen, Max L.; Biland, Adrian; et al. (2017)
Astroparticle Physics
MAGIC, a system of two imaging atmospheric Cherenkov telescopes, achieves its best performance under dark conditions, i.e. in absence of moonlight or twilight. Since operating the telescopes only during dark time would severely limit the duty cycle, observations are also performed when the Moon is present in the sky. Here we develop a dedicated Moon-adapted analysis to characterize the performance of MAGIC under moonlight. We evaluate energy threshold, angular resolution and sensitivity of MAGIC under different background light levels, based on Crab Nebula observations and tuned Monte Carlo simulations. This study includes observations taken under non-standard hardware configurations, such as reducing the camera photomultiplier tubes gain by a factor  ∼ 1.7 (reduced HV settings) with respect to standard settings (nominal HV) or using UV-pass filters to strongly reduce the amount of moonlight reaching the cameras of the telescopes. The Crab Nebula spectrum is correctly reconstructed in all the studied illumination levels, that reach up to 30 times brighter than under dark conditions. The main effect of moonlight is an increase in the analysis energy threshold and in the systematic uncertainties on the flux normalization. The sensitivity degradation is constrained to be below 10%, within 15–30% and between 60 and 80% for nominal HV, reduced HV and UV-pass filter observations, respectively. No worsening of the angular resolution was found. Thanks to observations during moonlight, the maximal duty cycle of MAGIC can be increased from  ∼ 18%, under dark nights only, to up to  ∼ 40% in total with only moderate performance degradation.
Bokeh mirror alignment for Cherenkov telescopes
Ahnen, Max L.; Baack, Dominik; Balbo, Matteo; et al. (2016)
Astroparticle Physics
Improving the performance of the single-dish Cherenkov telescope MAGIC through the use of signal timing
MAGIC Collaboration; Aliu, E.; Anderhub, Hans-Bruno; et al. (2009)
Astroparticle Physics
Observation of a VHE cosmic-ray flare-signal with the L3+C muon spectrometer
L3+C Collaboration; Adriani, O.; Betev, Botio; et al. (2010)
Astroparticle Physics
High-energy e − / e + spectrometer via coherent interaction in a bent crystal
Bagli, Enrico; Guidi, Vincenzo; Howard, Alexander (2018)
Astroparticle Physics
Ultra-violet imaging of the night-time earth by EUSO-Balloon towards space-based ultra-high energy cosmic ray observations
Abdellaoui, Ghouti; Peter, Thomas; et al. (2019)
Astroparticle Physics
Performance of the MAGIC stereo system obtained with Crab Nebula data
Aleksić, J.; Biland, Adrian; Boller, A.; et al. (2012)
Astroparticle Physics
Measurement of the shadowing of high-energy cosmic rays by the Moon: A search for TeV-energy antiprotons
L3 Collaboration; Achard, Pablo; Anderhub, Hans-Bruno; et al. (2005)
Astroparticle Physics
Space-quality data from balloon-borne telescopes
Rhodes, Jason; Dobke, Benjamin; Booth, Jeffrey; et al. (2012)
Astroparticle Physics

Publications 1 - 10 of 15

Journal: Astroparticle Physics

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