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Magnus Rahm17/06/2022, 11:30
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Zenny Wettersten (Lund University)Posters
The chirality-flow method, which recasts the Lorentz calculations of special relativity to create an entirely graphical representation of the standard model of particle physics, has proven to make analytic calculations very simple. With the development of a numerical chirality-flow implementation for massless quantum electrodynamics, based on a standard program for calculating probabilities in...
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Hugo LaurellPosters
We have developed a continuous variable quantum state tomography protocol for photoelectrons that are ionised by the absorption of extreme ultraviolet (XUV) light pulses. Through numerical simulations we demonstrate our result in the vicinity of the 2s2p and 3s^{-1}4p Fano resonances in helium and argon. In the case of argon we are able to quantify the ion-photoelectron entanglement due to the...
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Per Alexander Ekman (Lund University (SE))Posters
The LHC delivers an unprecedented number of proton-proton collisions to its experiments. However, in kinematic regimes first studied by earlier generations of collider experiments, the online/offline processing and offline storage of the data can be limiting factors for a deeper probing of new physics.
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In this contribution, we describe a strategy that the ATLAS experiment employs to overcome... -
Olga Sunneborn Gudnadottir (Uppsala University (SE))Posters
Dark matter could have its origin in a new, strongly coupled, dark sector with fermion constituents that form dark analogies to the standard model mesons, and if so, these dark mesons could already have been produced in the 13 TeV proton-proton collisions in the LHC Run 2.
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I will present my ongoing search for Dark Mesons in LHC Run 2 data collected with the ATLAS detector, focusing both on... -
Axel Stenquist (Lund University)Posters
Attosecond transient absorption spectroscopy is used to study electron dynamics with the aim of unravelling ultra-fast phenomena in atoms and molecules. The absorption of a two-level wave packet coupled to both bound and continuum states is studied theoretically by the construction of an analytical model. This allows for disentanglement of fundamental absorption and emission processes of...
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David Leimbach (Gothenburg University (SE))Posters
In neutral atoms and positive ions, the binding of the electron cloud is due to the Coulomb attraction of the positively charged nucleus, allowing the description of electronic states via the independent particle approximation. In negative ions, however, the Coulomb potential of the nucleus is almost entirely screened, and the binding of the additional electron is resulting from polarization...
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Dawid Patrzalek (European Spallation Source ERIC), Nick Gazis (European Spallation Source - ESS ERIC)Posters
The neutron facility of the European Spallation Source – ESS is currently undergoing construction and installation in Lund, Sweden with the goal to achieve a 5MW proton beam of 2 GeV Linear Accelerator (LINAC). This LINAC could also be used to produce an intense neutrino beam, which combined with a megaton water Cherenkov detector could observe CP violation in the leptonic sector for the first...
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Josh Greaves (Lund University)Posters
Despite the proven success of the Standard Model, with a history of discoveries confirming its predictions, it is well known that it is not a complete theory. The model is deficient in its ability to answer a number of questions that nature has posed; a leading question among these is about the composition of the vast majority of the matter in our universe.
Beginning from the well motivated...
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Samuel Bengtsson (Lund University)Posters
We experimentally observe longer than long trajectory influence in high order harmonic generation by varying the peak intensity of the driving laser field through either direct attenuation, or by chirping the laser pulse. We compare this to a simple Gaussian beam model to explain the shape of the on and off-axis quantum path interference (QPI) observed. From the resulting harmonic specific QPI...
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Marius PlachPosters
The investigation of ultrafast electron dynamics using nonlinear extreme ultraviolet (XUV)-pump XUV-probe spectroscopy requires light sources with high flux and high intensity. High-order harmonic generation (HHG) can provide this, but tight spatial focusing is needed. Hereby, the longitudinal overlap of harmonic foci is critical. We present experimental and simulated results on the focusing...
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Nils WeberPosters
Pulsed gas nozzles are widely used in molecular and atomic physics to prepare gaseous samples for light-matter interactions. The expansion behavior and density distribution of the released gas is difficult to determine, however of particular interest. The gas density is, e. g., one of the crucial parameters for the conversion efficiency and phase matching properties of high-order harmonic...
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Zhen Zhao (Lund University)Posters
The Green Function (GF) technique can be a good candidate for the study of the strongly coherent behavior and the magnetic structure factor of real materials, and in particular to address the case of long-range coupling. We present a new approach to solve a finite $S = 1/2$, two-dimensional (2D) frustrated $J_1-J_2$ quantum Heisenberg Model (QHM) within the GF scheme. The magnon Hedin’s...
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Anna Onnerstad (University of Jyväskylä (FI))Posters
Transport properties of quark-gluon plasma (QGP) created in ultra-relativistic heavy-ion collisions, contain important information on quantum chromodynamics (QCD). With a more precise estimate of the transport properties, such as specific shear and bulk viscosity, it is possible to deepen our understanding of QCD. In this talk, we present our latest study in inferring the transport properties...
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Ms Belikse Ramljak (Lund University, Department of Physics, Division of Nuclear Physics)Posters
Emergency preparedness and response arrangements are essential for ensuring safety of on-site workers and members of the public from the accidental release of radionuclides. Accidental releases from the European Spallation Source (ESS) will include a different set of radionuclides than accidental releases from a nuclear power plant, and therefore the potential internal contamination...
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Ahmed Alshemi (Lund University)Posters
To date, several materials have been proposed as hosts for the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) spatially modulated superconducting state [1], but direct experimental proof has been challenging, with only the organic superconductors providing uncontested evidence for the state [2]. The FFLO state is expected to develop at high fields and low temperatures in materials with strong Pauli...
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Prof. Ann-Marie Pendrill (Lund university)Posters
Teaching force and motion is a well-known challenge. The traditional mathematical desriptions of bodies in motion rarely connect to human bodies and acceleration often remains an abstract concept. However, the forces experienced by an accelerating body can also be measured with smartphone sensors, and the data recorded can be saved and brought back to the classroom for analysis. In this way,...
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Daniel Díaz Rivas (Division of Atomic Physics, Lund University)Posters
Ultrashort laser pulses with time-dependent polarisation states have applications such as the generation of isolated attosecond pulses and the study of the optical chirality of molecules. In this project, we develop a method to measure the time-dependent polarisation of 6 fs laser pulses with the dispersion scan technique (d-scan). First, the pulses are transmitted through a combination of two...
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Tim Günter (ESS ERIC, LU)Posters
The design of moderators for cold neutron sources utilizes simulation software which make use of thermal scattering data files. These data files are derived from the microscopic properties of the moderation materials and can be used with numerical methods (like Monte-Carlo simulations) to simulate the moderation process of the neutrons. However, due to limitations of the software, the...
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Emma Campillo (Lund University)Posters
To better understand the behaviour of CeCu$_2$Si$_2$ and other Pauli limited superconductors, we present a physically-based expression for the size and magnetisation of the vortex cores in Pauli-limited superconductors, based on the results of first-principles computations [1].
Unconventional superconductors, with pairing mechanisms and properties that are not accounted for BCS theory are a...
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Megha GopalakrishnaPosters
We study the time-resolved optical response of a model diatomic molecule (Hubbard-like dimer) in a quantum cavity, and characterize how such response is influenced by the driving field, the electronic interactions and the nuclear motion, for both the second harmonic generation (SHG) and the resonance regimes. Our theoretical description is based on a full quantum and equal footing treatment of...
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Ann-Kathrin RaabPosters
Post-compression in bulk multi-pass cells (MPCs) is a very cost- and space efficient method for creating ultrashort pulses in the femtosecond regime. We present such a setup that compresses the output of a 200 kHz, 34 W, 300 fs Yb amplifier to 31 fs, with a peak power in the Gigawatt range, setting a new record value for bulk-MPCs. A detailed investigation of the input parameters and a...
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Jan Marcus DahlströmPosters
Short-wavelength Rabi oscillations are observed in helium atoms using intense pulses from a seeded free-electron laser. Single-cycle Rabi dynamics take place on the ultra-fast timescale in the extreme-ultraviolet regime. An analytical model, based on a Dyson series of the Rabi oscillating two states, is developed to quantitatively explain interference effects of ejected photoelectrons and...
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Dr Felipe Zapata Abellan (Lund University)Posters
Attosecond physics aims to unravel the electron motion and coherence in atoms and molecules. A major contribution to this field was the real-time observation of the motion of valance-shell electrons in krypton ions made by Goulielmakis et al. in 2010 [1]. Since then, ATAS has been widely used in different scenarios [2]. Despite the great success of ATAS, all studies so far are based on...
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Dr Asimina Papoulia (Lund University), Ms Rezvan Tahouri (Lund University)Posters
Attosecond physics aims to unravel the electron motion and coherence in atoms and molecules. Major contributions to this field are the real-time observations of the motion of electrons in ions and atoms through attosecond transient absorption spectroscopy (ATAS). Regarding the lack of a relativistic theory, our aim is to develop a general relativistic ATAS method for studying atoms far beyond...
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Michael Odelius (Stockholms universitet)Posters
The sub-picosecond dynamics of gas-phase Fe(CO)5 have been simulated by the fewest switches surface hopping method based on TDDFT (CAM-B3LYP) forces. The dynamics simulations were initiated in the S6 1MLCT state corresponding to the optically bright transition in the UV absorption spectrum centered at 266 nm. We show that in-phase oscillations of predominantly axially coordinated carbonyl...
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Fredrik Olof Andre Parnefjord Gustafsson (Austrian Academy of Sciences (AT))Posters
Work done with: Maxime Allemand 2 , Daniel Comparat 3 , Jules Cras 3 , Carina Killian 1 ,Chloé Malbrunot 4 , Martin Simon 1 , Christophe Siour 3 , Tim Wolz 5 , Eberhard Widmann 1 on behalf of the ASACUSA-CUSP collaboration.
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1 Stefan Meyer Institute, Austria, 2 Ecole normale supérieure Paris-Saclay, France, 3 Université Paris-Saclay, CNRS, Laboratoire Aimé Cotton, France, 4 TRIUMF, Canada, 5... -
Francesca Curbis (Department of Physics, Lund University), Sverker Werin (Department of Physics, Lund University), Prof. Per Eng-Johnsson (Department of Physics, Lund University)Posters
The SXL (Soft X-ray Laser) project is a design for a soft X-ray Free Electron Laser (FEL) in the 1–5 nm wavelength range, to be installed at and driven by the existing MAX IV 3 GeV linac. The project was initiated by a group of Swedish users of FEL radiation. In this contribution we will focus on the FEL itself developed for the first phase of the project based on two different accelerator...
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Mr Sebastian Kilde Löfgren (Department of Physics, University of Gothenburg)Posters
With the power of 3D printers and simulations, there are plenty of opportunities to make concepts in modern physics more available. A 3D-printed physical model of a particle trap, the Paul trap, has been developed alongside a simulation focused on implementation in Swedish upper secondary physics education. The Paul trap is an example of a method used in many areas of modern physics, such as...
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Jakob BeisePosters
Core-collapse supernovae (CCSNe) are known to be among the most energetic processes in our Universe and are vital for the understanding of the formation and chemical composition of the Universe. The measurement of neutrinos from CCSNe provides an important key to unravel the remaining open questions in the CCSN trigger mechanisms. Supernova sensitivity studies for the neutrino telescope...
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Robin Weissenbilder (Lund University)Posters
We present an ultra-stable and high spectral resolution attosecond pump-probe setup for photoelectron interferometry. Our system, based on a Mach-Zehnder interferometer, uses active stabilization of the interferometer arm lengths obtained directly from the phase relation of the pump and probe femtosecond laser pulses. With this technique, the system is stable to within 14 attosecond...
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Timea VitosPosters
The spin structure of the weak gauge bosons produced at non-zero transverse momentum at proton-proton colliders leads to a parametrization of the cross section of the Drell-Yan process by a set of eight angular coefficients. These coefficients have been measured for the Z-boson by various experiments. The W-boson mass measurement at the LHC relies in part on precise knowledge of the W-boson...
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