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Wallin, Erik
Publications (6 of 6) Show all publications
Harvey, C. N., Gonoskov, A., Marklund, M. & Wallin, E. (2016). Narrowing of the emission angle in high-intensity Compton scattering. Physical Review A. Atomic, Molecular, and Optical Physics, 93(2), Article ID 022112.
Open this publication in new window or tab >>Narrowing of the emission angle in high-intensity Compton scattering
2016 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 93, no 2, article id 022112Article in journal (Refereed) Published
Abstract [en]

We consider the emission spectrum of high-energy electrons in an intense laser field. At high intensities (a0∼200) we find that the QED theory predicts a narrower angular spread of emissions than the classical theory. This is due to the classical theory overestimating the energy loss of the particles, resulting in them becoming more susceptible to reflection in the laser pulse.

Place, publisher, year, edition, pages
American Physical Society, 2016
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-118249 (URN)10.1103/PhysRevA.93.022112 (DOI)000370243800003 ()
Available from: 2016-03-17 Created: 2016-03-14 Last updated: 2018-06-07Bibliographically approved
Wallin, E., Gonoskov, A. & Marklund, M. (2015). Effects of high energy photon emissions in laser generated ultra-relativistic plasmas: Real-time synchrotron simulations. Physics of Plasmas, 22(3), Article ID 033117.
Open this publication in new window or tab >>Effects of high energy photon emissions in laser generated ultra-relativistic plasmas: Real-time synchrotron simulations
2015 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 22, no 3, article id 033117Article in journal (Refereed) Published
Abstract [en]

We model the emission of high energy photons due to relativistic charged particle motion in intense laser-plasma interactions. This is done within a particle-in-cell code, for which high frequency radiation normally cannot be resolved due to finite time steps and grid size. A simple expression for the synchrotron radiation spectra is used together with a Monte-Carlo method for the emittance. We extend previous work by allowing for arbitrary fields, considering the particles to be in instantaneous circular motion due to an effective magnetic field. Furthermore, we implement noise reduction techniques and present validity estimates of the method. Finally, we perform a rigorous comparison to the mechanism of radiation reaction, and find the emitted energy to be in excellent agreement with the losses calculated using radiation reaction. (C) 2015 AIP Publishing LLC.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2015
National Category
Physical Sciences
Identifiers
urn:nbn:se:umu:diva-103169 (URN)10.1063/1.4916491 (DOI)000352163500081 ()
Available from: 2015-05-27 Created: 2015-05-18 Last updated: 2018-06-07Bibliographically approved
Gonoskov, A., Bastrakov, S., Efimenko, E., Ilderton, A., Marklund, M., Meyerov, I., . . . Wallin, E. (2015). Extended particle-in-cell schemes for physics in ultrastrong laser fields: Review and developments. Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, 92(2), Article ID 023305.
Open this publication in new window or tab >>Extended particle-in-cell schemes for physics in ultrastrong laser fields: Review and developments
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2015 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, E-ISSN 1550-2376, Vol. 92, no 2, article id 023305Article in journal (Refereed) Published
Abstract [en]

We review common extensions of particle-in-cell (PIC) schemes which account for strong field phenomena in laser-plasma interactions. After describing the physical processes of interest and their numerical implementation, we provide solutions for several associated methodological and algorithmic problems. We propose a modified event generator that precisely models the entire spectrum of incoherent particle emission without any low-energy cutoff, and which imposes close to the weakest possible demands on the numerical time step. Based on this, we also develop an adaptive event generator that subdivides the time step for locally resolving QED events, allowing for efficient simulation of cascades. Further, we present a unified technical interface for including the processes of interest in different PIC implementations. Two PIC codes which support this interface, PICADOR and ELMIS, are also briefly reviewed.

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-108462 (URN)10.1103/PhysRevE.92.023305 (DOI)000359868300006 ()
Available from: 2015-09-22 Created: 2015-09-11 Last updated: 2018-06-07Bibliographically approved
Harvey, C., Marklund, M. & Wallin, E. (2015). High-energy gamma-ray beams from nonlinear Thomson and Compton cattering in the ultra-intense regime. In: Jaroszynski, DA (Ed.), Relativistic plasma waves and particle beams as coherent and incoherent radiation sources: . Paper presented at Conference on relativistic plasma waves and particle beams as coherent and Incoherent radiation sources, APR 15-16, 2015, Prague, Czech Republic. , 9509, Article ID 950908.
Open this publication in new window or tab >>High-energy gamma-ray beams from nonlinear Thomson and Compton cattering in the ultra-intense regime
2015 (English)In: Relativistic plasma waves and particle beams as coherent and incoherent radiation sources / [ed] Jaroszynski, DA, 2015, Vol. 9509, article id 950908Conference paper, Published paper (Refereed)
Abstract [en]

We consider the Thomson and Compton scattering of high-energy electrons n an intense laser pulse. Our simulations show that energy losses due o radiation reaction cause the emitted radiation to be spread over a roader angular range than the case without these losses included. We xplain this in terms of the effect of these energy losses on the article dynamics. Finally, at ultra-high intensities, i.e. fields with dimensionless parameter a(0)similar to 200, the energy of the ission pectrum is significantly reduced by radiation reaction and also the lassical and QED results begin to differ. This is found to be due to he classical theory overestimating the energy loss of the electrons. uch findings are relevant to radiation source development involving e ext generation of high-intensity laser facilities.

Series
Proceedings of SPIE, ISSN 0277-786X
Keywords
nonlinear Compton scattering, ultra-intense lasers, strong field QED, diation reaction
National Category
Physical Sciences
Identifiers
urn:nbn:se:umu:diva-107103 (URN)10.1117/12.2179769 (DOI)000357641000003 ()978-1-62841-630-5 (ISBN)
Conference
Conference on relativistic plasma waves and particle beams as coherent and Incoherent radiation sources, APR 15-16, 2015, Prague, Czech Republic
Available from: 2015-08-19 Created: 2015-08-18 Last updated: 2018-06-07Bibliographically approved
Wallin, E., Zamanian, J. & Brodin, G. (2014). Three-wave interaction and Manley-Rowe relations in quantum hydrodynamics. Journal of Plasma Physics, 80, 643-652
Open this publication in new window or tab >>Three-wave interaction and Manley-Rowe relations in quantum hydrodynamics
2014 (English)In: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 80, p. 643-652Article in journal (Refereed) Published
Abstract [en]

The theory for nonlinear three-wave interaction in magnetized plasmas is reconsidered using quantum hydrodynamics. The general coupling coefficients are calculated for the generalized Bohm de Broglie term. It is found that the Manley-Rowe relations are fulfilled only if the form of the particle dispersive term coincides with the standard expression. The implications of our results are discussed.

Place, publisher, year, edition, pages
Cambridge University Press, 2014
National Category
Physical Sciences
Identifiers
urn:nbn:se:umu:diva-92937 (URN)10.1017/S0022377814000075 (DOI)000339899700010 ()
Available from: 2014-09-12 Created: 2014-09-09 Last updated: 2018-06-07Bibliographically approved
Hansson, T., Wallin, E., Brodin, G. & Marklund, M. (2013). Scalar Wigner theory for polarized light in nonlinear Kerr media. Journal of the Optical Society of America. B, Optical physics, 30(6), 1765-1769
Open this publication in new window or tab >>Scalar Wigner theory for polarized light in nonlinear Kerr media
2013 (English)In: Journal of the Optical Society of America. B, Optical physics, ISSN 0740-3224, E-ISSN 1520-8540, Vol. 30, no 6, p. 1765-1769Article in journal (Refereed) Published
Abstract [en]

A scalar Wigner distribution function for describing polarized light is proposed in analogy with the treatment of spin variables in quantum kinetic theory. The formalism is applied to the propagation of circularly polarized light in nonlinear Kerr media, and an extended phase-space evolution equation is derived along with invariant quantities. The formalism is additionally used to analyze the modulational instability. (C) 2013 Optical Society of America

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-76795 (URN)10.1364/JOSAB.30.001765 (DOI)000319739100052 ()
Available from: 2013-07-16 Created: 2013-07-15 Last updated: 2018-06-08Bibliographically approved
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