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Étude et modélisation de l’interaction des particules cosmiques avec les détecteurs cryogéniques de l'astronomie submillimétrique et X

Abstract : Cosmic rays are emitted from different galactic sources and consist of protons and helium nuclei. These elements interact with matter and deposit part of their energy by nuclear interaction.The Planck/HFI instrument observed the sky from space to map the Cosmic Microwave Background. For this purpose, HFI has a focal plane cool down to 100 mK and composed of 54 bolometers. The interactions of the cosmic ray flux with the detectors' components (thermometer, grid and wafer) heat up regularly the sensor (glitches) which leads to a degradation of the scientific signal. Studying them revealed another thermal effect characterized by a thermal increase of the entire focal plane up to the microkelvin range, the High Coincidence Events (HCE).Two HCE famillies were separated: the fast ones, generated by cosmic ray showers developed in the external layers of the satellite and interacting with the entire HFI instrument and the slow ones, generated by the vaporisation of helium forming a ponctual thermal link between the focal plane and the 1.6 K stage facing it.Exposure of a TES bolometer matrix to an α particules source showed a similar response but also simultaneous glitches on several pixels. This work demonstrates that cosmic rays and particle showers on next low temperature experiments has to be studied to prevent predominating thermal effects from it. The developpement of futur space experiments will have to take these interactions into account to elimiate them from data.
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https://tel.archives-ouvertes.fr/tel-01230938
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Submitted on : Thursday, November 19, 2015 - 11:52:10 AM
Last modification on : Wednesday, September 16, 2020 - 4:45:58 PM
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Antoine Miniussi. Étude et modélisation de l’interaction des particules cosmiques avec les détecteurs cryogéniques de l'astronomie submillimétrique et X. Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]. Université Paris-Saclay, 2015. Français. ⟨NNT : 2015SACLS004⟩. ⟨tel-01230938⟩

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