Tesis sobre el tema "Very high energy electrons"
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Ronga, Maria Grazia. "Study and modelling of very high energy electrons (VHEE) radiation therapy". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPAST036.
Texto completoThe development of innovative methods capable of reducing the sensitivity of healthy tissue to radiation, while maintaining the effectiveness of the treatment on the tumour, is a central aspect of improving the effectiveness of radiotherapy in the treatment of cancer. Among possible developments and methodological innovations, the combination of ultra-high dose rate irradiation (FLASH) and very high energy electrons (VHEE) could make it possible to exploit the radiobiological advantages of the FLASH effect for the treatment of deep tumours. In particular, VHEEs in the 100 to 250 MeV energy range would be particularly interesting from a ballistic and biological point of view for the application of FLASH irradiation in radiotherapy. This thesis therefore studies the possible use of VHEEs in radiotherapy, and in particular their use at ultra-high dose rates, thus assessing the feasibility of FLASH-VHEE radiotherapy. Although promising, several aspects of this technique need to be studied before it can be used in a clinical context. The first part of this work studies the machine parameters required to meet the constraints of FLASH irradiation. To this end, an analytical model for calculating the dose based on Fermi-Eyges multiple scattering theory was developed and tested. This analytical model has also been used to design and optimise a double-scattering system for VHEE therapy, in order to obtain field sizes greater than 15x15 cm², and to assess the possible adaptation of conventional particle beam conformation methods for FLASH-VHEE therapy. The second part of this work focuses on VHEE treatment planning and the evaluation of clinical plans. Four representative clinical cases were studied, for which pencil-beam scanning (PBS) and double scattering (DS) treatment plans were calculated. The influence of beam energy on plan quality was studied and the PBS and DS techniques were compared. A temporal description of the irradiation was also carried out, as well as the incorporation of a FLASH modification factor when evaluating the plan and its effect on healthy tissue in FLASH mode. Finally, the estimation of doses from secondary particles and radiation protection issues were addressed. A calculation of the secondary dose due to Bremsstrahlung photons and neutrons from the two dose delivery systems was developed in water. The secondary particle dose received by various organs was also assessed in the context of intracranial treatments and in order to demonstrate the advantage of VHEE beams over proton beams in terms of out-of-field neutron dose. In summary, the fast analytical models parameterised in this study allow the dose distribution produced by a VHEE system to be estimated with good accuracy, providing important information for the potential design of a VHEE system. The results of this work could support the development of FLASH-VHEE radiotherapy
Mallot, Ann Kathrin. "The energy spectrum of cosmic electrons measured with the MAGIC telescopes". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2017. http://dx.doi.org/10.18452/17698.
Texto completoThe measurement presented in this thesis seeks to provide an increased overlap of the Fermi-LAT and AMS-02 measurement, as well as the very-high-energy H.E.S.S. and VERITAS measurement. The MAGIC telescopes, a stereoscopic system of imaging air-shower Cherenkov telescopes, are a good candidate for such a measurement. They overlap largely with the Fermi-LAT energy range, down to 130 GeV, and extend into the energy range of the H.E.S.S. system, extending the measurement up to 4 TeV. The measurement performed in this thesis uses a non-standard method developed especially for this analysis. It is based on a machine-learning-algorithm which differentiates between hadronic and electro-magnetic air showers. The background needs to be simulated from Monte Carlo protons, which were produced in large quantities for this thesis. As this is an indirect detection method, the systematic uncertainties are much larger than those of the satellite missions. A detailed study of the systematic uncertainties was performed in the scope of this thesis, which prove to be much larger than the statistical uncertainties. The measured spectrum presented here extends from 135 GeV up to 4 TeV. It shows no clear break in the spectrum and is in line with an extension of the single power-law observed by Fermi-LAT and AMS-02. A broken power-law interpretation was disfavored when compared to the single power-law. The final spectrum has a powerlaw index of -3.14+-0.05(stat)+-0.5(syst). Due to the large uncertainties no definitive conclusion can be given at this point. Also, the cutoff seen by H.E.S.S. can not be ruled out. The result presented in this thesis is compatible with the Fermi-LAT and AMS-02 results, however there is minor tension with the H.E.S.S. and VERITAS results around 4 TeV. The limiting factor of the method is the large systematic uncertainty, making it impossible to distinguish between different electron sources for the results presented in this thesis.
Kashiyama, Kazumi. "Origins of High Energy Cosmic-Ray Electrons and Positrons". 京都大学 (Kyoto University), 2012. http://hdl.handle.net/2433/157757.
Texto completoCarlton, Ashley Kelly. "Characterizing high-energy electrons in space using science imagers". Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120413.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 129-140).
Harsh radiation in the form of ionized, highly energetic particles is part of the space environment and can affect the operation, performance, and lifetime of spacecraft and their instruments. Jupiter has the largest and strongest magnetosphere of all of the planets in the solar system and it is dominated by high-energy electrons. Measuring and characterizing megaelectron volt (MeV) particles is fundamental for understanding the energetic processes powering the magnetosphere, interactions of the particles with surfaces of the Jovian satellites, and the effects of these particles on spacecraft near or in Jovian orbit. Electrons in Jupiter's magnetosphere can interact with spacecraft and lead to component failures, degradation of sensors and solar panels, and physical damage to materials. Dedicated instruments to monitor the radiation environment are not always included on spacecraft due to resource constraints. Measurements of the high-energy (>1 MeV) electron environment at Jupiter are currently spatially and temporally limited, predominantly coming from the Energetic Particle Detector (EPD) on the Galileo spacecraft. In this thesis, we develop ways to use existing hardware on spacecraft to measure the energetic particle environment. Solid-state detectors are commonly used as scientific imagers on spacecraft. In addition to being sensitive to incoming photons, semiconductor devices also are affected by incoming charged particles collected during integration and detector readout. These radiation hits from the space environment are typically considered "noise" at the detector. We develop a technique to extract quantitative high-energy electron environment information (energy and flux) from science imager radiation "noise". We use data from the Galileo spacecraft Solid-State Imaging (SSI) instrument, which is a silicon charge-coupled device (CCD). We post-process raw SSI images to obtain frames with only the radiation contribution. The camera settings are used to compute the energy deposited in each pixel, which corresponds to the intensity of the observed radiation hits. The energy deposited in the SSI pixels by incident particles from processed SSI images are compared with the results from 3D Monte Carlo transport simulations of the SSI using Geant4. Simulating the response of the SSI instrument to mono-energetic electron environments, we find that the SSI is capable of detecting >10 MeV electrons (>90% of <10 MeV particles are stopped with 95% confidence). Using geometric scaling factors computed for the SSI, we calculate the environment particle flux given a number of pixels with radiation hits. We compare the SSI results to measurements from the Galileo EPD, examining the electron fluxes from the >11 MeV integral flux channel. We find agreement with the EPD data within 3-sigma of the EPD data for 43 out of 43 (100%) of the SSI images evaluated. 62% of fluxes are also within 1-sigma of the EPD data. To demonstrate that the general technique is applicable to other imagers, we also analyze the Galileo Near-Infrared Mapping Spectrometer (NIMS). We find that NIMS is sensitive to >5 MeV electrons and the calculated fluxes are consistent with the EPD. This approach can be applied to other sets of imaging data (star trackers, etc.) in energetic electron environments, such as those found in geostationary Earth orbit. This thesis also includes a summary of required and recommended information (tests, models, etc.) for the use of science imagers as high-energy electron sensors.
by Ashley Kelly Carlton.
Ph. D.
Aizatsky, N. I., N. P. Dikiy, A. N. Dovbnya, I. D. Fedorets, V. A. Kushnir, Yu V. Lyashko, D. V. Medvedev et al. "Properties of Zirconia Nanoceramics under High-Energy Electrons Irradiation". Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35622.
Texto completoDickinson, Hugh John. "Very high energy gamma-rays from binary systems". Thesis, Durham University, 2010. http://etheses.dur.ac.uk/290/.
Texto completoGuillaud, Mathilde. "Neutrino oscillations at very high energy/matter density". Thesis, KTH, Fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-292510.
Texto completoNeutrinooscillationer i materia kan studeras i olika regimer beroende på inkommande neutrinernas energi och densiteten hos det bakomliggande mediet. I detta examensarbete undersöker vi neutrinooscillationer i gränsen av tät materia och mycket hög energi (TeV-PeV-intervall), och tar hänsyn till den absorption av neutriner som då kan inträffa i sådant materia. Detta absorptionsfenomen är relevant för neutrino-teleskopmätningar av astrofysiska neutriner. Vi börjar med att kort påminna oss om neutrinooscillationer i vakuum och konstruktionen av PMNS-matrisen. Vi försätter sedan med beräkningar av neutrinooscillationer i tät materia. Vi undersöker noggrannheten i resulterande effektiva 2-neutrino-blandningsformlerna. De uppvisar en god noggrannhet i jordlika materieprofiler i vårt intervall av energier. Vi utvecklar beräkningarna av oscillationssannolikheterna i tät materia inklusive absorption genom laddad ström oelastisk spridning i båda två- och tresmaksfallen. Vi finner att astrofysiska neutriner i tät materia absorberas, vilket minskar betydligt flödena för varje smak, med en resonansabsorption av elektron-antineutrino omkring E_res\simeq 6.3PeV. Vi diskuterar sedan effekterna av neutrinoabsorption på jorden för neutrino-teleskopmätningar. Vi finner att sol- och månskuggning är inte problematisk för nuvarande teleskop och kunde vara en bra vinkelupplösningsindikator för kommande teeskop.
Sritragool, Kunlapaporn. "Modification of Rubber Particle filled Thermoplastic with High Energy Electrons". Doctoral thesis, Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000954.
Texto completoWilliams, Andrew James. "A water calorimeter for high energy x-rays and electrons". Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394541.
Texto completoLemieux, François 1979. "Are inflationary predictions sensitive to very high energy physics?" Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80316.
Texto completoSchroedter, Martin. "The very high energy gamma-ray spectra of AGN". Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/290128.
Texto completoDickinson, Mark R. "Very high energy gamma ray observations of southern hemisphere blazars". Thesis, Durham University, 1997. http://etheses.dur.ac.uk/4705/.
Texto completoMak, Wai-ying y 麥偉瑩. "Very high energy gamma-ray emission from active galactic nuclei". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31221464.
Texto completoMak, Wai-ying. "Very high energy gamma-ray emission from active galactic nuclei /". Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20567492.
Texto completoXiao, Dan. "Development and Investigation of High-Performance Fire Retardant Polypropylene Nanocomposites via High Energy Electrons". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-229650.
Texto completoRobinson, D. "A study of high transverse momentum electrons produced in high energy proton-antiproton collisions". Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47230.
Texto completoElgammal, Sherif. "Detection of high energy electrons in the CMS detector at the LHC". Doctoral thesis, Universite Libre de Bruxelles, 2009. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210208.
Texto completoDoctorat en Sciences
info:eu-repo/semantics/nonPublished
Wolfe, Gregory John. "Effects of Large Doses of High Energy Electrons on a YBa2Cu3O6 + delta High Temperature Superconductors". Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/25879.
Texto completoPallassini, Renato. "A study of very high energy γ-ray emission from blazars". Thesis, University of Leeds, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441185.
Texto completoCheesebrough, Alistair. "The search for very high energy γ-rays from misaligned AGN". Thesis, Durham University, 2013. http://etheses.dur.ac.uk/7717/.
Texto completoKwok, Ping Wai. "Very high-energy gamma rays from the Crab nebula and pulsar". Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184863.
Texto completoFegan, Stephen. "A very high energy gamma-ray survey of unidentified EGRET sources". Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/280605.
Texto completoHu, Hsiu-Lien. "Quantum transport of energetic electrons in ballistic nanostructures". Virtual Press, 2000. http://liblink.bsu.edu/uhtbin/catkey/1178341.
Texto completoDepartment of Physics and Astronomy
Schlenker, Stefan. "Very high energy gamma rays from the binary pulsar PSR B1259-63". Doctoral thesis, [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=976502267.
Texto completoRayner, Stephen Mark. "Very high energy gamma rays from isolated pulsars and non-pulsating objects". Thesis, Durham University, 1989. http://etheses.dur.ac.uk/6458/.
Texto completoChadwick, Mary Paula. "Very high energy cosmic gamma rays from radio and X-ray pulsars". Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6720/.
Texto completoVasileiou, Vlasios. "A search for bursts of very high energy gamma rays with milagro". College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8570.
Texto completoThesis research directed by: Dept. of Physics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Gajdus, Michael. "The Vela pulsar in very high energy gamma-rays with H.E.S.S. II". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17610.
Texto completoThe analysis of the first pulsar to be detected with the H.E.S.S. array is presented. The high significance detection at the 11.4 s level down to a hitherto unachievable 15 GeV energy threshold is a result of 24 h of observations of the Vela pulsar with the new CT5 telescope introduced into the array in 2012. This is only the second pulsar to be detected in the very high energy (VHE) ?-ray regime. Of particular interest are the VHE spectra of pulsars as this is an almost completely unexplored energy domain. This does however entail smaller signals as the rate of ?-rays generally drops according to a power law function. New weighted statistical tests are introduced to improve the sensitivity to weak pulsations for use with future observations of pulsars. These tests are modifications of currently used tests and are applicable to any discrete data in which a single or many pulses are expected; they are powerful when the phase profile is unknown and with a basic weighting provide up to a 10 % boost in detection significance. An optimised analysis chain contributed to the detection of the Vela pulsar with phase averaged energy flux in the energy range (15,125) GeV of 4.29_(-1.02)^(+1.14)_stat _(-3.31)^(+5.50)_sys × 10^(-11) erg cm^(-2) s^(-1). The single pulse is characterised with an asymmetric Lorentzian function with a narrower trailing edge. The photon flux falls as a power law with index -5.39 which is moderately consistent with an Angular Gap emission model but represents a steeper drop in emission than that measured with the Fermi-LAT. The emission efficiency of the Vela pulsar in the VHE band is evaluated as 0.0025 %, which is comparable to that of the Crab pulsar in the same energy regime measured with the MAGIC telescope array. Comparisons to other candidate VHE pulsars are also drawn. A weak constraint is placed on the energy at which Lorentz invariance violation occurs in terms of the Planck energy as E_LIV>10^(-4) E_P.
Wagner, Robert M. "Very High Blazar Astrophysics : Measurement of Very High Energy Gamma-Ray Emission from Four Blazars Using the MAGIC Telescope and a Comparative Blazar Study /". Fischbachtal, Odenw : HARLAND media, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=3001678&prov=M&dok_var=1&dok_ext=htm.
Texto completoHoffmann, Agnes Irene Dorothee. "Analysis of hard X-ray emission from selected very high energy g-ray". Reutlingen, Bruno-Matzke-Str.15 A. Hoffmann, 2009. http://d-nb.info/999640429/34.
Texto completoNoyes, David Carl. "A search for short duration very high energy emission from gamma-ray bursts". College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2910.
Texto completoThesis research directed by: Physics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Hayashida, Masaaki. "Observation of Very-High-Energy Gamma-Rays from Blazars with the MAGIC Telescope". Diss., lmu, 2008. http://nbn-resolving.de/urn:nbn:de:bvb:19-82911.
Texto completoHinman, Roderick Thornton. "Recovered energy logic--a logic family and power supply featuring very high efficiency". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/12015.
Texto completoIncludes bibliographical references (p. 215-220).
by Roderick Thornton Hinman.
Ph.D.
Tsirou, Michelle. "Study of Pulsar Wind Nebulae in Very-High-Energy gamma-rays with H.E.S.S". Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS096.
Texto completoPulsar wind nebulae consist of magnetised clouds of positrons and electrons accelerated to very high energies through the action of a central pulsar, often embedded within a host supernova remnant. They are the largest population of firmly identified sources of TeV gamma-rays within the Galaxy and are thought to be contributors to the leptonic Galactic cosmic-ray spectrum,and thus viable source candidates in the quest to interpret the origin of the cosmic-ray positron fraction excess. Their very-high-energy gamma-ray emission is of particular interest for spectral models, as their dominant radiation process is inverse Compton scattering on target photons present in interstellar radiation fields such as the visible, near and far infrared ambient photons in addition to the Cosmic Microwave Background.In this thesis dissertation I present the scope of my research work, which lies on pulsar wind nebula morphology and understanding their very-high-energy radiation.I report the latest morphological and spectral studies of the pulsar wind nebula within the MSH 15-52 composite supernova remnant through High Energy Stereoscopic System (H.E.S.S.) observations.In this phenomenological study I have conducted a fit of the very-high-energy emission morphology beyond ~ 0.3 TeV detected in HESS-I data using a template X-ray synchrotron map in the 4–7 keV band based on archival Chandra observations. In the model of the emission, the gamma-ray emission produced by inverse Compton scattering is thought to ensue from the same leptonic population responsible for the observed synchrotron emission, and thus the X-ray template represents the spatial distribution of these electrons and positrons, convolved with the spatial dependence of the magnetic field. Our best-fit results yield an additional extended TeV component located on the south-eastern region of the nebula, centered at ∼4 pc from the position of the associated pulsar PSR B1509-58, with an intrinsic radius of ∼7′(or 9 pc). We also detect a significant steepening in the spectral shape of the total emission from the pulsar wind nebula, occurring above∼10 TeV. This coincides with a shrinking of the emission observed in the sky map, as revealed by our energy-dependent morphological analyses. Several scenarii are presented so as to explain our morphological and spectral results concerning the emission originating from MSH 15-52. Based on the Galactic radiation field characteristics derived from published models, the gamma-ray emission is well described by leptons scattering on the far infrared and cosmic microwave backgrounds, respectively at lower and higher energies than the detected spectral steepening energy, which suggests an interpretation of the energy dependence as a consequence of Klein-Nishina effects in the cross-section.During the last year of my thesis I have worked with collaborators on a study of drivers behind the observed significant offsets of TeV-emitting pulsar wind nebulae with respect to their pulsar. We performed relativistic (magneto)-hydrodynamical numerical simulations and tested physical setups in one-dimensional studies and are pursuing an ongoing two-dimensional investigation to quantify the effect of the pulsar proper motion in comparison to ambient medium density gradients so as to derive constrains on these physical factors leading to asymmetrical evolution in pulsar wind nebulae
Theiling, Mark. "Observations of very high energy gamma ray emission from supernova remnants with VERITAS". Connect to this title online, 2009. http://etd.lib.clemson.edu/documents/1263397351/.
Texto completoChandril, Sandeep. "In situ structural and compositional analysis using RHEED electrons induced x-rays". Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10641.
Texto completoTitle from document title page. Document formatted into pages; contains ix, 97 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 95-97).
Clark, Michelle Susan. "Improving the feasibility of energy disaggregation in very high- and low-rate sampling scenarios". Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/54873.
Texto completoApplied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
Bartko, Hendrik. "Observation of Galactic Sources of Very High Energy Gamma-Rays with the MAGIC Telescope". Diss., Lichtenberg (Odw.) : Harland Media, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=3001679&prov=M&dok_var=1&dok_ext=htm.
Texto completoKeogh, Dominic Robert. "The search for pulsar wind nebulae in the very high energy gamma-ray regime". Thesis, Durham University, 2010. http://etheses.dur.ac.uk/776/.
Texto completoMacRae, John Hamish Kenneth. "The detection of very high energy cosmic gamma rays using the atmospheric Cerenkov technique". Thesis, Durham University, 1985. http://etheses.dur.ac.uk/7854/.
Texto completoCarraminana, Alberto. "Very high energy gamma ray astronomy and non pulsating low mass X-ray binaries". Thesis, Durham University, 1991. http://etheses.dur.ac.uk/6241/.
Texto completoTomarchio, Salvatore Gaspare. "Power Switching Converters with very low power consumption and high efficiency for energy savings". Doctoral thesis, Università di Catania, 2013. http://hdl.handle.net/10761/1311.
Texto completoErgin, Tülün. "The energy spectrum of very high energy gamma rays from the Crab Nebula as measured by the H.E.S.S. array". [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=979099897.
Texto completoErgin, Tülün. "The energy spectrum of very high energy gamma rays from the Crab Nebula as measured by the H.E.S.S. array". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2006. http://dx.doi.org/10.18452/15435.
Texto completoThe goal of this thesis is to implement the methods developed for the HEGRA experiment to reconstruct the geometry and energy of the air-showers induced by the cosmic high-energy gamma rays into the software environment of the H.E.S.S. experiment. Furthermore, using the implemented algorithms, a search for the unpulsed emission is aimed in the energy range between 300 GeV and 20 TeV from the Crab Nebula using the first stereoscopic data taken during October and November 2003 with the 3 telescope configuration of the H.E.S.S. array in Phase-I. The Phase-I of the H.E.S.S. array was completed in December 2003 by the addition of the fourth telescope. By testing the reconstruction algorithms of a complete Phase-I H.E.S.S. array with Monte Carlo simulations, it is found that the resolution of the reconstructed direction and energy of a gamma-ray event from a zenith angle of 45 degrees is around 0.15 degrees and 14 percent, respectively. The data on the Crab Nebula including runs with wobble offset of +-0.5 degrees and +-1.0 degrees is collected at zenith angles from 45 degrees to 50 degrees for a total of 4 hours and gives a background subtracted signal of about 50 standard deviations. The differential energy spectrum of the unpulsed gamma-ray emission from the Crab Nebula is found to be (dN / dE) = (3.37+-0.47)*10^{-11}*E^{-2.59+-0.12} cm^{-2} s^{-1} TeV^{-1} between 450 GeV and 20 TeV after all cuts. The integral flux above 1 TeV is (2.11+-0.29)*10^{-11} cm^{-2} s^{-1}. These results are consistent with the results published by other experiments, in particular HEGRA and Whipple. The results agree well with the expectation from synchrotron self-Compton models for TeV emission range. The magnetic field in the region, where TeV gamma rays are produced, is found to be 0.18+-0.01 mG. This result agrees with the magnetic field values deduced by the models. The results obtained for the Crab Nebula in this thesis demonstrate the performance of the H.E.S.S. array.
Ernst, Darin R. (Darin Richard) 1965. "Momentum transport, radial electric field, and ion thermal energy confinement in very high temperature plasmas". Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50337.
Texto completoKrygier, Andrew. "On The Origin of Super-Hot Electrons in Intense Laser-Plasma Interactions". The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1365724528.
Texto completoZackrisson, Björn. "Biological effects of high energy radiation and ultra high dose rates". Doctoral thesis, Umeå universitet, Onkologisk radiobiologi, 1991. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-96889.
Texto completoS. 1-44: sammanfattning, s. 47-130: 5 uppsatser
digitalisering@umu
Brown, Anthony Murray. "Very high energy emission and multi-wavelength campaigns of the BL Lac object PKS 2155-304". Thesis, Durham University, 2006. http://etheses.dur.ac.uk/919/.
Texto completoSeglar-Arroyo, Monica. "Studying the origin of cosmic-rays : Multi-messenger studies with very-high-energy gamma-ray instruments". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS260.
Texto completoThe explosive phenomena occurring in the high-energy Universe are able to accelerate particles up to the highest energies. These processes produce secondary particles of different nature, i.e. photons and neutrinos. In special cases, these events induce perturbations on the space-time, i.e. gravitational waves detectable by interferometers on Earth. The combination and the complementary information provided by these cosmic messengers may allow to answer open questions in astrophysics, as the origin of cosmic rays. Amongst the most violent events producing such signals are the merge of the two densest objects, as neutron stars and black holes or the accretion activity in galaxies onto a supermassive black hole. In this work, we focus on the very-high energy photons that these extreme events produce, and the connection with the other counterparts, in order to provide a broad multi-messenger picture which enables the study of the physical mechanisms in place. The challenges inherent to time-domain multi-messenger astronomy are discussed and tackled, which involves simultaneous coordinated worldwide effort across facilities and astronomical disciplines. A novel, optimized GW follow-up observation strategy for small/mid- FoV instruments as H.E.S.S. and the future CTA, able to perform a rapid response to alerts, which considers the characteristics of the GW event and maximizes the chances to detect the electromagnetic counterpart will be presented. This strategy was proven successful in follow-up observations with the H.E.S.S. telescopes and in particular in the case of the first ever detected binary neutron star merger, GW170817. In the context of the AMON network, a multi-messenger analysis that combines gravitational wave events with HAWC data, with the aim to identify astrophysical coincidences out of independent events, has been developed. In addition, the discovery by H.E.S.S. in very-high energies of the active galactic nucleus OT 081, during a flaring episode in July 2016, will be presented
Collins, William James. "A measurement of the forward-backward asymmetry of e'+e'- -> Z'0 -> bb using electrons at OPAL". Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309334.
Texto completo