Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"Hard X-rays"”.
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Application of precision engineering for nanometre focussing of hard X-rays in synchrotron beam lines
… modern synchrotron beamlines are able to focus X-rays to a few microns in size. Although the technology to achieve this is well established, performing routine experiments with such beams is still time consuming and requires careful set up. Furthermore there is a need to be able to carry out …
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High field terahertz radiation : conduits to synchronized hyper spectral systems
… to the soft X-Ray region. However, accessing the hard X-ray region remains elusive, and the domain of specialized facilities. The key insight to accessing hard X-rays optically may not be in seeking to convert optical frequencies upward, but rather downward to frequencies spanning a 100 to 10,000 …
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Compact laser-driven electron acceleration, bunch compression and coherent nonlinear Thomson scattering
Coherent hard x-rays have many medical, commercial and academic research applications. To facilitate the design of a table-top coherent hard x-ray source, this thesis studies the linear acceleration of electrons by optical lasers in unbounded vacuum, the linear acceleration and compression of …
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X-Ray Scattering Studies of Charge and Orbital Ordering in Transition Metal Oxides
… range electronic correlations. Here, we present hard and soft x-ray diffraction results on iron and manganese compounds, and demonstrate the utility of resonant x-ray diffraction in revealing their electronic properties. By performing comprehensive hard x-ray RXD studies on the complex charge …
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MODELING X-RAY DATA OF BLACK HOLE BINARIES
… (optical/UV/X-ray) data from the 2005 hard state outburst of the black hole SWIFT J1753.5-0127. This system is both fairly bright and has fairly low interstellar absorption, so gives one of the best datasets to study the weak, cool disc emission in this state. We fit these data using …
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Small and large-scale magnetic fields involved with solar flares
… upon multiwavelength observations of flares from hard X-rays to radio wavelengths obtained from several ground-and space-based instruments. The studied topics in the flare core regions include microflares, flare-induced evolution of the photospheric magnetic field, and sigmoids. The large scale …
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Magnetic X-ray Reflectivity
… and multilayer systems via magnetic soft and hard x-ray reflectivity. The focus here is on 3d transition metals, which are used mainly for development of numerous noval magnetic devices, that are both technologically and scientifically interesting. Complementary to Neutron diffraction, which …
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Hard X-ray diagnostics of particle acceleration and energy release in solar flares and coronal jets
… of which are driven by magnetic reconnection. Hard X-ray (HXR) emissions, produced via bremsstrahlung, provide direct diagnostics of thermal plasma and energetic electron populations, offering critical insights into the energy release and particle acceleration processes in these events. One …
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The binary system containing the pulsar PSR 1913+16 and ultra-violet and x-radiation from accreting magnetic white dwarfs
… bremsstrahlung component can be observable in hard X-rays, while the black-body component can be'observab1e in soft X-rays. The observed spectrum varies with time when the accretion rate does. Ordinarily, only a few percent of the total accretion luminosity is accessible to existing detectors. …
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Measurements and modeling of Lower Hybrid Driven fast electrons on Alcator C-Mod
… for measuring LH-driven fast electrons is a hard x-ray (HXR) camera that measures fast electron Bremsstrahlung emission. This is a horizontallyviewing diagnostic with 32 spatial chords that span the plasma cross-section. Each chord ends at a cadmium zinc telluride (CZT) detector that detects …
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Statistical properties of Radio Halos and the re-acceleration model
… heated up to the observed temperature. Radio and hard-X ray observations have discovered non-thermal components mixed with the thermal Intra Cluster Medium (ICM) and this is of great importance as it calls for a “revision” of the physics of the ICM. The bulk of present information comes from the …