رسالة جامعية
Optimization of future projects for the measurement of Cosmic Microwave Background polarization ; Optimisation des projets futurs pour la mesure de la polarisation de fond diffuse cosmologique
| العنوان: | Optimization of future projects for the measurement of Cosmic Microwave Background polarization ; Optimisation des projets futurs pour la mesure de la polarisation de fond diffuse cosmologique |
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| المؤلفون: | Hoang, Thuong Duc |
| المساهمون: | AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Sorbonne Paris Cité, Guillaume Patanchon |
| المصدر: | https://theses.hal.science/tel-02494060Test ; Physics [physics]. Université Sorbonne Paris Cité, 2018. English. ⟨NNT : 2018USPCC235⟩. |
| بيانات النشر: | HAL CCSD |
| سنة النشر: | 2018 |
| المجموعة: | Archive de l'Observatoire de Paris (HAL) |
| مصطلحات موضوعية: | Cosmic Microwave Background polarization, CMB experiments, Data analysis, Instrumentation, Observational cosmology, Polarisation du fond diffus cosmologique, Expériences CMB, Analyse de données, Cosmologie observationnelle, [PHYS.PHYS]Physics [physics]/Physics [physics] |
| الوصف: | During my Ph.D., my research focused on the development of future projects for the measurement of Cosmic Microwave Background (CMB) polarization aimed to probe primordial B mode. Achieving this goal will not only require sufficient detector array sensitivity but also unprecedented control of all systematic errors inherent to CMB polarization measurements. One of the important effects is the bandpass mismatch error which is the effect of non-uniformity or mismatch of the bandpass filters for different detectors inducing leakage from foreground intensity to polarization after calibrating the data on CMB. I estimated the level of the leakage for a realistic configuration of the forthcoming LiteBIRD JAXA mission with simulation and found that the amplitude of leakage depends on the scanning strategy of the satellite parameterized with precession angle, spin angle, precession and rotation velocities. After the study, I proposed some nearly optimal configurations to archive the target of tensor-to-scalar ratio r. The bias from foreground leakage in the range 2≤l≤10 (reionization bump) is of the order of about 5×〖10〗^(-4) and in the range 10≤l≤200 (recombination bump) of the order of about 5×〖10〗^(-5). The second topic of my thesis was an instrumental study: the interaction of particles with a Transition Edge Sensors (TES) array using the focal plane of the ground-based QUBIC (Q U Bolometric Interferometer for Cosmology) experiment. The goal of this work was to test the behaviour of detectors to cosmic rays (such as time-constants and cross-talk). I placed an Americium 241 radioactive source in front of a 256 TESs array inside a cryostat. When particles hit one of the components of a pixel (eg: Thermometer, absorbing grid, substrate), the deposited energy induced temperature elevation among components and possibly to the neighbor pixels. This could provide an evaluation of the cross-talk between pixels. Moreover, this study allows us to understand the thermal and electronic readout system time constants of a TES. ; Au ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| اللغة: | English |
| العلاقة: | NNT: 2018USPCC235; tel-02494060; https://theses.hal.science/tel-02494060Test; https://theses.hal.science/tel-02494060v2/documentTest; https://theses.hal.science/tel-02494060v2/file/HOANG_Duc_Thuong_1_Complete_20181217.pdfTest |
| الإتاحة: | https://theses.hal.science/tel-02494060Test https://theses.hal.science/tel-02494060v2/documentTest https://theses.hal.science/tel-02494060v2/file/HOANG_Duc_Thuong_1_Complete_20181217.pdfTest |
| حقوق: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.890E7A01 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |