Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for subject:(fluorescence telescope). Showing records 1 – 3 of 3 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


University of Utah

1. Shah, Priti Dhanesh. Monocular measurement of the ultra-high energy cosmic ray spectrum.

Degree: PhD, Physics, 2012, University of Utah

The Telescope Array Project was designed to observe cosmic rays with energies greaterthan 1018 eV. Its goals are to study the physics of cosmic rays by measuring their anisotropy,composition, and energy spectrum. This work makes a monocular measurement of the ultrahigh energy cosmic ray spectrum and analyzes the physics produced from that spectrum.The flux of cosmic rays observed on Earth follows a power law over 12 decades inenergy and 32 decades in flux. At the highest energies, the spectrum has detailed structure.Studying these features can tell us about the astrophysics of the production and propagationof cosmic rays. First, it can tell us about the sources of cosmic rays such as they capableof producing a power law spectrum and the maximum energy of cosmic rays that they canproduce. Second, the acceleration mechanisms that can boost cosmic rays to ultra highenergies can be studied. Third, the spectral features themselves can tell us about theirpossible cause for formation. For example, the ankle feature in the ultra high energy regimecan tell us if it is the galactic-extragalactic transition or if it is due to e+e− pair production.Fourth, the energy losses that cosmic rays incur can tell us about their physical interactionsduring propagation. Studying the physics of the cosmic ray spectrum in the ultra highenergy regime with data from the Telescope Array Project is the goal of this analysis.The Telescope Array Project consists of three fluorescence detectors overlooking an arrayof 507 scintillation surface detectors. Due to their extremely low flux at these energies,cosmic rays can only be observed indirectly via an extensive air shower produced when theycollide with the nucleus of an atom in the Earth’s atmosphere. These charged secondaryparticles produce fluorescence light. The array of surface detectors observes the lateralfootprint of the extensive air shower when it reaches the ground. The fluorescence detectorsobserve the longitudinal profile of this fluorescence light. This thesis analyzes the data fromone of the fluorescence detectors, Middle Drum, using a different geometry reconstructiontechnique, the Time versus Angle geometry.The results of this analysis show an ultra high energy cosmic ray spectrum that isconsistent with the results previously published by the High Resolution Fly’s Eye (HiRes)experiment, the Telescope Array surface detectors, and other experiments in this energyregion. Due to insufficient statistics at this date, the GZK cutoff cannot be confirmed inthis analysis, but a fit shows the cutoff to be at log10 E (E/eV) = 19.56 ± 0.36, with aspectral index after the cutoff of -3.86 ± 2.0. This is within the range determined previouslyby other measurements. This analysis shows that the feature known as the ankle occurs atlog10 E (E/eV) = 18.63 ± 0.09, with a spectral index of -3.27 ± 0.07 before the ankle and aspectral index of -2.81 ± 0.10 after the ankle. The normalized log likelihood per degree offreedom is 0.90. The ankle is observed at the 4−5! confidence level. The fit to the ankle…

Subjects/Keywords: ankle; Cosmic Rays; Energy Spectrum; fluorescence detector; GZK cutoff; Telescope Array

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Shah, P. D. (2012). Monocular measurement of the ultra-high energy cosmic ray spectrum. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1928/rec/1637

Chicago Manual of Style (16th Edition):

Shah, Priti Dhanesh. “Monocular measurement of the ultra-high energy cosmic ray spectrum.” 2012. Doctoral Dissertation, University of Utah. Accessed May 21, 2019. http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1928/rec/1637.

MLA Handbook (7th Edition):

Shah, Priti Dhanesh. “Monocular measurement of the ultra-high energy cosmic ray spectrum.” 2012. Web. 21 May 2019.

Vancouver:

Shah PD. Monocular measurement of the ultra-high energy cosmic ray spectrum. [Internet] [Doctoral dissertation]. University of Utah; 2012. [cited 2019 May 21]. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1928/rec/1637.

Council of Science Editors:

Shah PD. Monocular measurement of the ultra-high energy cosmic ray spectrum. [Doctoral Dissertation]. University of Utah; 2012. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1928/rec/1637


University of Adelaide

2. Nguyen, Phong Huy. Energy systematics and long term performance of the Pierre Auger Observatory’s fluorescence telescopes.

Degree: 2018, University of Adelaide

Since the discovery of cosmic rays in the early 20th century, physicists have strived to gain a deeper understanding of the properties behind the universe’s most energetic particles. Aiding in this effort has been the development and operation of very large cosmic ray detectors, which have successfully contributed to numerous advancements in the field of cosmic ray astrophysics. The most notable of such detectors is the Pierre Auger Observatory, situated in the Mendoza province of western Argentina, and is the result of an international effort to study cosmic rays of the highest of energies. The Pierre Auger Observatory utilises two well established methods to study enormous particle showers initiated by the interaction of incoming cosmic rays at the top of the Earth’s atmosphere. One such method is the detection of faint fluorescence light emitted during the longitudinal evolution of a cosmic ray initiated particle shower, achieved through the specially designed fluorescence detector. This thesis will investigate the long term performance and stability of the Pierre Auger Observatory’s energy scale, with a particular focus on the Observatory’s fluorescence detector. A brief history of the discovery of cosmic rays is presented in Chapter 1, followed by a discussion of the current knowledge of the properties of the cosmic ray flux and possible production mechanisms. Chapter 2 begins with a review of the physics of extensive air showers and shower detection methods, as well as a discussion of several notable cosmic ray experiments, both past and present. This is followed by an extensive discussion of the Pierre Auger Observatory in Chapter 3. Recent notable results and discoveries are highlighted in Chapter 4. Chapter 5 begins with a discussion of the calibration methods used to monitor the performance of the Observatory’s fluorescence detector. This will be followed by an extensive analysis of the long term stability of the Observatory’s energy scale. This includes a discussion of notable analyses improvements developed in recent years, and the effect of these improvements on the Observatory’s energy scale. Chapter 6 begins with a discussion of how the night sky background signal is monitored by the Observatory’s fluorescence detector. A cross check method is developed to use the night sky background observed between neighbouring fluorescence telescopes to monitor the stability of their inter-calibration. In Chapter 7 a cross check method is developed to monitor the long term stability of the fluorescence detector’s absolute calibration using stellar photometry. The results are compared with the long term stability of the Observatory’s energy scale from Chapter 5. The results from these studies are summarised in Chapter 8. Advisors/Committee Members: Dawson, Bruce Robert (advisor), Bellido Caceres, Jose Alfredo (advisor), School of Physical Sciences (school).

Subjects/Keywords: Cosmic rays; fluorescence telescope; Pierre Auger Observatory; long term performance

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Nguyen, P. H. (2018). Energy systematics and long term performance of the Pierre Auger Observatory’s fluorescence telescopes. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/113385

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Nguyen, Phong Huy. “Energy systematics and long term performance of the Pierre Auger Observatory’s fluorescence telescopes.” 2018. Thesis, University of Adelaide. Accessed May 21, 2019. http://hdl.handle.net/2440/113385.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Nguyen, Phong Huy. “Energy systematics and long term performance of the Pierre Auger Observatory’s fluorescence telescopes.” 2018. Web. 21 May 2019.

Vancouver:

Nguyen PH. Energy systematics and long term performance of the Pierre Auger Observatory’s fluorescence telescopes. [Internet] [Thesis]. University of Adelaide; 2018. [cited 2019 May 21]. Available from: http://hdl.handle.net/2440/113385.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nguyen PH. Energy systematics and long term performance of the Pierre Auger Observatory’s fluorescence telescopes. [Thesis]. University of Adelaide; 2018. Available from: http://hdl.handle.net/2440/113385

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

3. Catalano, Camille. Premières lumières du télescope EUSO-Ballon : First light of the EUSO-Balloon telescope : toward the detection of ultra-high energy cosmic rays from space.

Degree: Docteur es, Astrophysique, 2015, Université Toulouse III – Paul Sabatier

Les rayons cosmiques ont été découverts il y a un siècle par Victor Hess à bord d'un vol scientifique en ballon. La physique des rayons cosmiques et les ballons stratosphériques ont partagé depuis lors une histoire commune, que ce soit pour d'authentiques découvertes ou en utilisant les ballons comme plateformes de test technologique pour de nouvelles missions satellites. Cette thèse, développée au sein de la collaboration JEM-EUSO, traite d'un démonstrateur en ballon stratosphérique. Notre but scientifique final est l'étude des Rayons Cosmiques de Ultra-Haute Energie (RCUHE), les particules les plus énergétiques connues dans l'Univers. Les RCUHES ont des énergies macroscopiques de plus de 1020eV mais étant extrêmement rares, leurs origines sont encore inconnues. Ces derniers pénètrent notre atmosphère à une fréquence de un par km2 par siècle, produisant une gerbe atmosphérique géante, détectable notamment par la lumière de fluorescence ultraviolette qu'elle émet. Le principe de détection proposé par notre collaboration consiste dans l'utilisation d'un observatoire spatial, JEM-EUSO. Son objectif est d'observer un très grand volume d'atmosphère afin d'enregistrer un nombre significatif des événements ultra-violet de fluorescence initiés par les RCUHEs. Le démonstrateur EUSO-Ballon a été développé par la collaboration JEM-EUSO dans le but de démontrer les technologies et méthodes utilisées par le futur instrument spatial. Le 25 août 2014, EUSO-Ballon a été lâché depuis la base de ballons stratosphériques de Timmins (Ontario, Canada) par la division ballon du CNES. L'instrument a fonctionné pendant toute une nuit astronomique, observant depuis 38km d'altitude la lumière UV provenant de divers types de sols et de centaines de gerbes atmosphériques simulées. Ces dernières ont été produites par des flashers et un laser embarqués dans un hélicoptère volant sous EUSO-Ballon pendant deux heures. Ces résultats ont été rendus possibles par la restitution de l'attitude de l'instrument effectuée à l'IRAP, c'est-à-dire une analyse exhaustive des données du vol des différents appareils de mesure d'attitude de la nacelle du ballon. Une caractérisation précise de chaque sous-système était aussi indispensable à l'exploitation des données du vol. Le système optique innovant, composé de deux grandes lentilles de Fresnel, a été intégré et entièrement testé à l'IRAP. Face au large système réfractif de l'instrument, une nouvelle méthodologie de test a été développée. Les performances de l'optique, efficacité et spot focal, ont ainsi été mesurées et se sont révélées étonnamment différentes des prédictions des modèles numériques. Ces mesures sont utilisées pour l'analyse des données du premier vol et pour mieux comprendre le comportement de ces toutes nouvelles optiques, éléments clés dans la conception de l'instrument JEM-EUSO.

A century ago Cosmic Rays were discovered by Victor Hess during one of the very first scientific balloon flights. Ever since, Cosmic Ray physics and stratospheric balloons have shared a common history - either…

Advisors/Committee Members: Ballmoos, Peter von (thesis director).

Subjects/Keywords: Rayons cosmiques; Lentille de Fresnel; Rayons cosmiques de ultra-haute énergie; Optique; Ballon stratosphérique; Télescope de fluorescence; Cosmic rays; Ultra-high energy cosmic rays; Stratospheric ballon; Fluorescence telescope; Optics; Fresnel

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Catalano, C. (2015). Premières lumières du télescope EUSO-Ballon : First light of the EUSO-Balloon telescope : toward the detection of ultra-high energy cosmic rays from space. (Doctoral Dissertation). Université Toulouse III – Paul Sabatier. Retrieved from http://www.theses.fr/2015TOU30329

Chicago Manual of Style (16th Edition):

Catalano, Camille. “Premières lumières du télescope EUSO-Ballon : First light of the EUSO-Balloon telescope : toward the detection of ultra-high energy cosmic rays from space.” 2015. Doctoral Dissertation, Université Toulouse III – Paul Sabatier. Accessed May 21, 2019. http://www.theses.fr/2015TOU30329.

MLA Handbook (7th Edition):

Catalano, Camille. “Premières lumières du télescope EUSO-Ballon : First light of the EUSO-Balloon telescope : toward the detection of ultra-high energy cosmic rays from space.” 2015. Web. 21 May 2019.

Vancouver:

Catalano C. Premières lumières du télescope EUSO-Ballon : First light of the EUSO-Balloon telescope : toward the detection of ultra-high energy cosmic rays from space. [Internet] [Doctoral dissertation]. Université Toulouse III – Paul Sabatier; 2015. [cited 2019 May 21]. Available from: http://www.theses.fr/2015TOU30329.

Council of Science Editors:

Catalano C. Premières lumières du télescope EUSO-Ballon : First light of the EUSO-Balloon telescope : toward the detection of ultra-high energy cosmic rays from space. [Doctoral Dissertation]. Université Toulouse III – Paul Sabatier; 2015. Available from: http://www.theses.fr/2015TOU30329

.