| 1. |
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- 2018
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In: Nuclear Fusion. - : IOP Publishing. - 1741-4326 .- 0029-5515. ; 58:1
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Research review (peer-reviewed)
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| 2. |
- Bombarda, F., et al.
(author)
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Runaway electron beam control
- 2019
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In: Plasma Physics and Controlled Fusion. - : IOP Publishing. - 1361-6587 .- 0741-3335. ; 61:1
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Journal article (peer-reviewed)
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| 14. |
- Krasilnikov, A., et al.
(author)
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Evidence of 9 Be + p nuclear reactions during 2ω CH and hydrogen minority ICRH in JET-ILW hydrogen and deuterium plasmas
- 2018
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In: Nuclear Fusion. - : IOP Publishing. - 1741-4326 .- 0029-5515. ; 58:2
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Journal article (peer-reviewed)abstract
- The intensity of 9Be + p nuclear fusion reactions was experimentally studied during second harmonic (2ω CH) ion-cyclotron resonance heating (ICRH) and further analyzed during fundamental hydrogen minority ICRH of JET-ILW hydrogen and deuterium plasmas. In relatively low-density plasmas with a high ICRH power, a population of fast H+ ions was created and measured by neutral particle analyzers. Primary and secondary nuclear reaction products, due to 9Be + p interaction, were observed with fast ion loss detectors, γ-ray spectrometers and neutron flux monitors and spectrometers. The possibility of using 9Be(p, d)2α and 9Be(p, α)6Li nuclear reactions to create a population of fast alpha particles and study their behaviour in non-active stage of ITER operation is discussed in the paper.
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| 21. |
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- 2018
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In: Nuclear Fusion. - : IOP Publishing. - 1741-4326 .- 0029-5515. ; 58:9
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Journal article (peer-reviewed)
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| 22. |
- Joffrin, E., et al.
(author)
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Overview of the JET preparation for deuterium-tritium operation with the ITER like-wall
- 2019
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In: Nuclear Fusion. - : IOP Publishing. - 1741-4326 .- 0029-5515. ; 59:11
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Research review (peer-reviewed)abstract
- For the past several years, the JET scientific programme (Pamela et al 2007 Fusion Eng. Des. 82 590) has been engaged in a multi-campaign effort, including experiments in D, H and T, leading up to 2020 and the first experiments with 50%/50% D-T mixtures since 1997 and the first ever D-T plasmas with the ITER mix of plasma-facing component materials. For this purpose, a concerted physics and technology programme was launched with a view to prepare the D-T campaign (DTE2). This paper addresses the key elements developed by the JET programme directly contributing to the D-T preparation. This intense preparation includes the review of the physics basis for the D-T operational scenarios, including the fusion power predictions through first principle and integrated modelling, and the impact of isotopes in the operation and physics of D-T plasmas (thermal and particle transport, high confinement mode (H-mode) access, Be and W erosion, fuel recovery, etc). This effort also requires improving several aspects of plasma operation for DTE2, such as real time control schemes, heat load control, disruption avoidance and a mitigation system (including the installation of a new shattered pellet injector), novel ion cyclotron resonance heating schemes (such as the three-ions scheme), new diagnostics (neutron camera and spectrometer, active Alfven eigenmode antennas, neutral gauges, radiation hard imaging systems...) and the calibration of the JET neutron diagnostics at 14 MeV for accurate fusion power measurement. The active preparation of JET for the 2020 D-T campaign provides an incomparable source of information and a basis for the future D-T operation of ITER, and it is also foreseen that a large number of key physics issues will be addressed in support of burning plasmas.
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| 23. |
- Cedervall, Johan, et al.
(author)
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Magnetocaloric effect in Fe2 P: Magnetic and phonon degrees of freedom
- 2019
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In: Physical Review B. - 2469-9969 .- 2469-9950. ; 99:17
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Journal article (peer-reviewed)abstract
- Devices based on magnetocaloric materials provide great hope for environmentally friendly and energy efficient cooling that does not rely on the use of harmful gasses. Fe2P based compounds are alloys that have shown great potential for magnetocaloric devices. The magnetic behavior in Fe2P is characterized by a strong magnetocaloric effect that coexists with a first-order magnetic transition (FOMT). Neutron diffraction and inelastic scattering, Mossbauer spectroscopy, and first-principles calculations have been used to determine the structural and magnetic state of Fe2P around the FOMT. The results reveal that ferromagnetic moments in the ordered phase are perturbed at the FOMT such that the moments cant away from the principle direction within a small temperature region. The acoustic-phonon modes reveal a temperature-dependent nonzero energy gap in the magnetically ordered phase that falls to zero at the FOMT. The interplay between the FOMT and the phonon energy gap indicates hybridization between magnetic modes strongly affected by spin-orbit coupling and phonon modes leading to magnon-phonon quasiparticles that drive the magnetocaloric effect.
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| 26. |
- Berntsen, Peter, 1974, et al.
(author)
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The serial millisecond crystallography instrument at the Australian Synchrotron incorporating the "Lipidico" injector
- 2019
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In: Review of Scientific Instruments. - : AIP Publishing. - 0034-6748 .- 1089-7623. ; 90:8
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Journal article (peer-reviewed)abstract
- A serial millisecond crystallography (SMX) facility has recently been implemented at the macromolecular crystallography beamline, MX2 at the Australian Synchrotron. The setup utilizes a combination of an EIGER X 16M detector system and an in-house developed high-viscosity injector, "Lipidico." Lipidico uses a syringe needle to extrude the microcrystal-containing viscous media and it is compatible with commercially available syringes. The combination of sample delivery via protein crystals suspended in a viscous mixture and a millisecond frame rate detector enables high-throughput serial crystallography at the Australian Synchrotron. A hit-finding algorithm, based on the principles of "robust-statistics," is employed to rapidly process the data. Here we present the first SMX experimental results with a detector frame rate of 100 Hz (10 ms exposures) and the Lipidico injector using a mixture of lysozyme microcrystals embedded in high vacuum silicon grease. Details of the experimental setup, sample injector, and data analysis pipeline are designed and developed as part of the Australian Synchrotron SMX instrument and are reviewed here. Published under license by AIP Publishing.
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| 27. |
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| 28. |
- Brink Pinto, Andrés, et al.
(author)
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Rum, politik och ”meningslösa” upplopp : Ungdomsupplopp i Stockholm 1948–1965
- 2019
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In: Arkiv - Tidskrift för samhällsanalys. - : Arkiv Forlag & Tidskrift. - 2000-6217 .- 2000-6225. ; :11, s. 41-69
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Journal article (peer-reviewed)abstract
- Under efterkrigstiden skakades Stockholm återkommande av så kallade ungdomsupplopp, som av samtidens makthavare förstods som opolitiska, ja näst intill meningslösa i sin obegriplighet. Samtidigt låter händelserna oss resonera kring förhållandet mellan det offentliga rummet och människors kollektiva aktörskap. Genom att närma sig upploppen utifrån den politiska filosofen Jacques Rancières teorier och kritisk humangeografi argumenterar Andrés Brink Pinto och Martin Ericsson i sin artikel för att upploppen i sig var ett möte mellan två oförenliga ordningar, polisens och jämlikhetens princip, att deltagarnas förståelse av händelserna går att närma sig via de kvarlevor de lämnat efter sig och att upploppen ur den synvinkeln i högsta grad bör förstås som politiska
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| 31. |
- Cedervall, Johan, et al.
(author)
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Influence of cobalt substitution on the magnetic properties of Fe5PB2
- 2018
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In: Inorganic Chemistry. - : American Chemical Society (ACS). - 0020-1669 .- 1520-510X. ; 57:2, s. 777-784
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Journal article (peer-reviewed)abstract
- In this study the effects of cobalt substitutions in Fe5PB2 have been studied. An increased cobalt content reduces the magnetic exchange interactions. This has been concluded from a large, linear decrease in both the Curie temperature as well as the saturated magnetic moment. At high cobalt concentrations, cobalt prefers to order at the M(2) position in the crystal structure. A tunable Curie transition like this shows some prerequisites for magnetic cooling applications.The substitutional effects of cobalt in (Fe1–xCox)5PB2 have been studied with respect to crystalline structure and chemical order with X-ray diffraction and Mössbauer spectroscopy. The magnetic properties have been determined from magnetic measurements, and density functional theory calculations have been performed for the magnetic properties of both the end compounds, as well as the chemically disordered intermediate compounds. The crystal structure of (Fe1–xCox)5PB2 is tetragonal (space group I4/mcm) with two different metal sites, with a preference for cobalt atoms in the M(2) position (4c) at higher cobalt contents. The substitution also affects the magnetic properties with a decrease of the Curie temperature (TC) with increasing cobalt content, from 622 to 152 K for Fe5PB2 and (Fe0.3Co0.7)5PB2, respectively. Thus, the Curie temperature is dependent on composition, and it is possible to tune TC to a temperature near room temperature, which is one prerequisite for magnetic cooling materials.
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| 32. |
- Cedervall, Johan, et al.
(author)
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Mössbauer study of the magnetocaloric compound AlFe2B2
- 2016
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In: Hyperfine Interactions. - : Springer Science and Business Media LLC. - 0304-3843 .- 1572-9540. ; 237
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Journal article (peer-reviewed)abstract
- Mössbauer spectroscopy in the ferromagnetic AlFe2B2 reveals Tc=299 K and shows good agreement with magnetic measurements. The crystals are plate-shaped. The flakes are found from X-ray diffraction to be in the crystallographic ac-plane in the orthorhombic system. The axes of the principle electric field gradient tensor are, by symmetry, colinear with the crystal a-, b- and c-axes. By using information about the quadrupole splitting and line asymmetry in the paramagnetic regime together with the quadrupole shift of the resonance lines in the ferromagnetic regime the magnetic hyperfine field direction is found to be in the ab-plane having an angle =40° to the b-axis.
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| 33. |
- Ericsson, Andreas, et al.
(author)
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Approximative computation methods for monostatic scattering from axially symmetric objects
- 2017
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In: Progress In Electromagnetics Research B. - 1937-6472. ; 79, s. 127-147
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Journal article (peer-reviewed)abstract
- Two approximation methods are presented for fast calculations of the monostatic scattering from axially symmetric scatterers coated with electromagnetic absorbers. The methods are designed for plane wave illumination parallel to the axis of rotation of the scatterer. The first method is based on simulating the scattering of a perfect electric conductor (PEC) enclosing the absorber coated scatterer, and multiplying the result with the squared magnitude of the absorber reflection coefficient in a planar scenario. The second method is based on simulating the scattering scenario in a physical optics (PO) solver, where the electromagnetic absorber is treated as reflection dyadic at the outer surface of the scatterer. Both methods result in a significant acceleration in computation speed in comparison to full wave methods, where the PO method carries out the computations in a number of seconds. The monostatic scattering from different geometries have been investigated, and parametric sweeps were carried out to test the limits where the methods yield accurate results. For specular reflections, the approximation methods yield very accurate results compared to full wave simulations when the radius of curvature is on the order of half a wavelength or larger of the incident signal. It is also concluded that the accuracy of the two methods varies depending on what type of absorber is applied to the scatterer, and that absorbers based on "volume losses" such as a carbon doped foam absorber and a thin magnetic absorber yield better results than absorbers based on resistive sheets, such as a Salisbury absorber.
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| 34. |
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| 35. |
- Ericsson, Andreas, et al.
(author)
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Functional Structures Applied to Doubly Curved Surfaces
- 2016
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Conference paper (peer-reviewed)abstract
- The effect of curvature on the performance of electromagnetic functional structures, such as electromagnetic absorbers and frequency selective surfaces, is investigated in this work. The monostatic radar cross section of a doubly curved, rotationally symmetric scatterer, with and without a coating electromagnetic absorber, is calculated. An analytical expression for calculating the far-field from the electric and magnetic fields of a single azimuthal mode excitation in circular polarization has been derived, in order to achieve fast and efficient full wave simulations. It is concluded that the effect of curvature is more severe for absorbers based on resistive sheets that for absorbers based on bulk loss.
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| 36. |
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| 37. |
- Ericsson, Anders, et al.
(author)
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Modeling of nucleation and growth in glass-forming alloys using a combination of classical and phase-field theory
- 2019
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In: Computational materials science. - : Elsevier. - 0927-0256 .- 1879-0801. ; 165, s. 167-179
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Journal article (peer-reviewed)abstract
- For metallic glasses, it is of vital importance to understand the glass formation properties and to be able to predict the crystallization process in the supercooled liquid. In the present work, we model the process of nucleation and growth using a combination of classical nucleation and phase-field theory. A diffusion coupled phase-field model is used to evaluate the work of formation and the growth behavior of the critical nucleus. The results are combined with classical nucleation and JMAK theory in order to estimate the glass forming ability of the compositions Cu64Zr36, Cu10Zr7 and CuZr2 in terms of TTT-diagrams and critical cooling rates. It is found that the work of formation of the critical nucleus from the phase-field theory agrees with the classical theory when the critical size is larger than the width of the solid-liquid interface. At smaller critical sizes, the work of formation deviates approximately linearly between the two theories. Furthermore, it is shown that the growth behavior from the phase-field simulations agree with analytical expressions of the growth rate from the classical theory.
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| 40. |
- Ericsson, Andreas, et al.
(author)
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Scattering for doubly curved functional surfaces and corresponding planar designs
- 2016
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In: 10th European Conference on Antennas and Propagation (EuCAP), 2016. - 9788890701863
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Conference paper (peer-reviewed)abstract
- We present a study of the performance degradation of electromagnetic absorbers when applied to doubly curved surfaces. The scattering from a perfectly conducting sphere coated with different types of single- and multilayer absorbers has been evaluated using analytic recursion expressions. A comparison of the effect of curvature on the absorber performance is presented for structures based on homogeneous resistive sheets and low permittivity spacers, circuit analog absorbers, bulk material absorbers, and ultra thin magnetic absorbers. A conclusion from this study is that bulk absorbers, based on lossy materials, are less sensitive to curvature than absorbers consisting of multiple layers of low permittivity spacers and resistive sheets.
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| 44. |
- Ericsson, Martin, et al.
(author)
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Anti-Fascist Race Biology : Gunnar Dahlberg and the Long Farewell to the Nordic 'Master Race'
- 2019
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In: Anti-Fascism in the Nordic Countries : New Perspectives, Comparisons and Transnational Connections - New Perspectives, Comparisons and Transnational Connections. - 9781138046948 - 9781315171210 ; , s. 145-159
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Book chapter (other academic/artistic)abstract
- On the evening of 6 December 1933, members of the National Socialist Party of Sweden (SNSP, Sveriges Nationalsocialistiska Parti), at this time the most aggressive Nazi organisation in the country, violently attacked a lecture at Stockholm University. This gave rise to an extensive press debate; newspapers from left to right condemned the attack, which ended up being a propaganda fiasco for SNSP. So what made the SNSP so incensed by this lecture? It had been organised by the Socialist student organisation Clarté and the lecturer was Gunnar Dahlberg (1893−1956), a researcher in the scientific discipline of ‘race biology’ at the nearby Uppsala University. A couple of years later, he was to become Director of the Swedish State Institute for Race Biology. In 1933, Dahlberg published an article in the magazine Ord och bild titled ‘The Nordic Race from a Socio-Anthropological Perspective’, in which he criticised the Nazi use of the concept of ‘race’ and in particular the notion that there was a superior ‘Nordic race’ (Dahlberg, 1933). In his lecture, he was to repeat this critique – not something that the explicitly racist SNSP was minded to tolerate.
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| 46. |
- Ericsson, Martin
(author)
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Common starting points, different directions. Assimilation policies for 'Travelling families' in Norway, Sweden and Finland c. 1850-1900.
- 2017
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In: Scandinavian Journal of History. - : Informa UK Limited. - 0346-8755 .- 1502-7716. ; 42:1, s. 96-121
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Journal article (peer-reviewed)abstract
- In the late 19th century, political debates emerged in Sweden and Norway as well as in Finland concerning Travelling families – in this article defined as indigenous itinerant families whom the settled population pejoratively designated with terms such as ‘tatere’ (Norway), ‘tattare’ (Sweden) or ‘zigenare’ (Finland). In this article, these debates are compared, and the transfer of ideas and proposals between the three countries is analysed. It is argued that, on a local level, similar politics of ‘territorial exclusion’ were enacted in all three countries. This was, however, challenged by ‘liberal social politics’, a strategy aiming not at exclusion but at forced assimilation by means such as, for example, removing children from their parents. This strategy was proposed in all three countries, and socio-political agents were well aware of the debates in the neighbouring countries. But it was only in Norway that the most far-reaching proposals were realized. This is explained mainly by pointing at the way in which leading agents chose to act when trying to implement their proposals. The article also problematizes some conclusions drawn in earlier research, where the emergence of debates on Travelling families has been explained by pointing at the rise of ethnic nationalism. Instead, the article argues, the emergence of the so-called ‘social question’ in Western Europe in the 19th century should be considered as an at least equally important background factor.
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| 47. |
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| 48. |
- Ericsson, Martin
(author)
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För integrationens skull? : Frågan om rösträtt för invandrare utan svenskt medborgarskap under efterkrigstiden
- 2019
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In: Arbetarhistoria: Meddelanden från arbetarrörelsens arkiv och bibliotek. - 0281-7446. ; 43:170-171, s. 22-29
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Journal article (other academic/artistic)abstract
- In 1975, Sweden extended voting rights in local elections toimmigrants without Swedish citizenship (resident aliens). In thisarticle, I show that the arguments behind the reform were based on a wish to speed up the integration of immigrants ratherthan normative ideas about the nature of democracy. The reform was in fact seen as part of the emerging Swedishintegration policy. Almost a decade later, the government tried to extend voting rights forresident aliens to national elections as well, while at the same time limiting voting rights for citizens living abroad (non-resident citizens). The initiative failed, partly because of the fact that integration was seen as a local political responsibility. Therefore, it was impossible to frame national voting rights for resident aliens as a way to facilitate integration. These domestic political factors, rather than philosophical arguments, shaped the outcome of the reforms on the voting rights of resident aliens.
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