Department of Physics and Technology
Recent Submissions
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Characterising Mesoscale Fast Flow Channels in the Polar Cap Ionosphere
(Doctoral thesis, 2021-01-22)The large-scale ionospheric convection that circulates in the high-latitude polar caps was initially assumed to be a smooth, laminar flow. However, it has now come to light that this is an oversimplified understanding of ... -
Origin and development of the Godbert-Greenwald furnace for measuring minimum ignition temperatures of dust clouds
(Journal article; Peer reviewed, 2019)Hot surfaces that can ignite explosible dust clouds can occur in various process situations in industry, e.g. inside furnaces, burners and dryers of various kinds. Hot surfaces can also be generated accidentally e.g. by ... -
Ion Behaviors in the Reconnection Diffusion Region of a Corrugated Magnetotail Current Sheet
(Journal article; Peer reviewed, 2019)The current sheet structure and ion behaviors in a magnetotail reconnection diffusion region are investigated. The multispacecraft analysis suggests a corrugated current sheet structure, interpreted as due to a flapping ... -
On the High‐Energy Spectral Component and Fine Time Structure of Terrestrial Gamma Ray Flashes
(Journal article; Peer reviewed, 2019)Terrestrial gamma ray flashes (TGFs) are very short bursts of gamma radiation associated to thunderstorm activity and are the manifestation of the highest‐energy natural particle acceleration phenomena occurring on Earth. ... -
Numerical investigation of a transformable modular PET system: Consideration of point-spread functions, module arrangements, and operation protocols
(Journal article; Peer reviewed, 2019)Positron emission tomography (PET) is a powerful tool for mapping the dynamic distribution of substances in visually opaque systems. A modular, scalable, transformable, and relocatable PET system is custom built to provide ... -
A Monte Carlo simulation framework for performance evaluation of a proton imaging system without front trackers
(Doctoral thesis, 2020-12-18)Today, radiotherapy is one of the main methods for cancer treatment and it is used to irradiate a tumour with a prescribed dose according to a dose plan designed to irradiate the tumour cells while sparing surrounding ... -
J/psi-hadron correlations in proton-proton collisions at 13 TeV with ALICE
(Doctoral thesis, 2020-12-17)The production mechanism of the J/ψ provides a testing ground for the under- standing of the strong interaction due to the interplay between perturbative and non-perturbative regimes. It is not yet perfectly understood and ... -
Characterization and application of 3D silicon microdosimeters
(Doctoral thesis, 2020-12-11)The effect of ionizing radiation on biological matter differs significantly between the various types of radiation. For the same amount of absorbed energy, some forms of radiation are much more effective in inducing ... -
Search for Pair Production of Bottom-Squarks in Final States with Hadronically Decaying Tau-leptons, b-jets and missing transverse momentum with the ATLAS Detector at the Large Hadron Collider
(Doctoral thesis, 2020-10-16)In this thesis a search for beyond the Standard Model physics, in particular for bottom-squark pairs in events with missing transverse momentum, b-tagged jets and hadronically decaying tau leptons is documented. The dataset ... -
A neutral matter-wave microscope (NEMI): Design and setup
(Doctoral thesis, 2012-03-09)Matter wave microscopes such as electron microscopes or helium ion microscopes are vital tools in numerous fields of sciences. This thesis presents the design of a new matter wave microscope using neutral helium atoms as ... -
Måling av ekvivalent åpningsvinkel for et 38 kHz fiskeri ekkolodd. Kalibrering av ekkolodd ved bruk av flere svingere
(Master thesis, 2020-08-09) -
Combined Thickness and Permittivity Measurement of Thin Layers with Open-Ended Coaxial Probes
(Peer reviewed; Journal article, 2019-04-12)This paper presents a method to simultaneously determine the thickness and permittivity of thin layers from multi-frequency reflection coefficient measurements using an open-ended coaxial probe. This is achieved by exploiting ... -
Comparison of fragmentation functions for jets dominated by light quarks and gluons from pp and Pb+Pb collisions in ATLAS
(Peer reviewed; Journal article, 2019)Charged-particle fragmentation functions for jets azimuthally balanced by a high-transverse-momentum, prompt, isolated photon are measured in 25 pb − 1 of p p and 0.49 nb − 1 of Pb + Pb collision data at 5.02 TeV per nucleon ... -
Constraints on mediator-based dark matter and scalar dark energy models using √s = 13 TeV pp collision data collected by the ATLAS detector
(Peer reviewed; Journal article, 2019)Constraints on selected mediator-based dark matter models and a scalar dark energy model using up to 37 fb−1s√ = 13 TeV pp collision data collected by the ATLAS detector at the LHC during 2015-2016 are summarised in this ... -
Constraining production models with light (anti-)nuclei measurements in small systems with ALICE at the LHC
(Peer reviewed; Journal article, 2019)The production of deuterons and anti-deuterons in pp collisions at √s = 7 and 13 TeV has been studied as a function of charged-particle multiplicity using the ALICE detector at the LHC. The preliminary results are shown ... -
Cross-section measurements of the Higgs boson decaying into a pair of τ-leptons in proton-proton collisions at √s=13 TeV with the ATLAS detector
(Peer reviewed; Journal article, 2019)A measurement of production cross sections of the Higgs boson in proton-proton collisions is presented in the H → τ τ decay channel. The analysis is performed using 36.1 fb − 1 of data recorded by the ATLAS experiment ... -
An explicit IMF By dependence on solar wind ‐ magnetosphere coupling
(Peer reviewed; Journal article, 2019)Presently, all empirical coupling functions quantifying the solar wind—magnetosphere energy—or magnetic flux conversion assume that the coupling is independent of the sign of the dawn-dusk component (B𝑦) of the Interplanetary ... -
Correlated long-range mixed-harmonic fluctuations measured in pp, p+Pb and low-multiplicity Pb+Pb collisions with the ATLAS detector
(Peer reviewed; Journal article, 2019)Correlations of two flow harmonics vn and vm via three- and four-particle cumulants are measured in 13 TeV pp, 5.02 TeV p+Pb, and 2.76 TeV peripheral Pb+Pb collisions with the ATLAS detector at the LHC. The goal is to ... -
Interplanetary Magnetic Field Control of Polar Ionospheric Equivalent Current System Modes
(Peer reviewed; Journal article, 2019)We analyze the response of different ionospheric equivalent current modes to variations in the interplanetary magnetic field (IMF) components By and Bz. Each mode comprises a fixed spatial pattern whose amplitude varies ... -
Investigating correlated fluctuations of conserved charges with net-Λ fluctuations in Pb–Pb collisions at ALICE
(Peer reviewed; Journal article, 2019)Event-by-event fluctuations of conserved charges – such as electric charge, strangeness, and baryon number – in ultrarelativistic heavy-ion collisions provide insight into the properties of the quark-gluon plasma and the ...
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