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Hagnestål, Anders
Publications (10 of 29) Show all publications
Moiseenko, V. E., Kotenko, V. G., Chernitskiy, S. V., Nemov, V. V., Ågren, O., Noack, K., . . . Garkusha, I. E. (2014). Research on stellarator-mirror fission-fusion hybrid. Plasma Physics and Controlled Fusion, 56(9), 094008
Open this publication in new window or tab >>Research on stellarator-mirror fission-fusion hybrid
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2014 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 56, no 9, p. 094008-Article in journal (Refereed) Published
Abstract [en]

The development of a stellarator-mirror fission-fusion hybrid concept is reviewed. The hybrid comprises of a fusion neutron source and a powerful sub-critical fast fission reactor core. The aim is the transmutation of spent nuclear fuel and safe fission energy production. In its fusion part, neutrons are generated in deuterium-tritium (D-T) plasma, confined magnetically in a stellarator-type system with an embedded magnetic mirror. Based on kinetic calculations, the energy balance for such a system is analyzed. Neutron calculations have been performed with the MCNPX code, and the principal design of the reactor part is developed. Neutron outflux at different outer parts of the reactor is calculated. Numerical simulations have been performed on the structure of a magnetic field in a model of the stellarator-mirror device, and that is achieved by switching off one or two coils of toroidal field in the Uragan-2M torsatron. The calculations predict the existence of closed magnetic surfaces under certain conditions. The confinement of fast particles in such a magnetic trap is analyzed.

Keywords
fusion reactor, fission reactor, fusion-fission hybrid, stellarator, mirror
National Category
Physical Sciences Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-234179 (URN)10.1088/0741-3335/56/9/094008 (DOI)000341854100009 ()
Available from: 2014-10-15 Created: 2014-10-14 Last updated: 2017-12-05Bibliographically approved
Noack, K., Ågren, O., Moiseenko, V. E. & Hagnestål, A. (2013). Comments on the power amplification factor of a driven subcritical system. Annals of Nuclear Energy, 59, 261-266
Open this publication in new window or tab >>Comments on the power amplification factor of a driven subcritical system
2013 (English)In: Annals of Nuclear Energy, ISSN 0306-4549, E-ISSN 1873-2100, Vol. 59, p. 261-266Article in journal (Refereed) Published
Abstract [en]

The power amplification factor PAF of a driven subcritical system is defined as the ratio of the fission power output of the blanket to the power which the driver must deliver to sustain its neutron source intensity. This parameter decisively determines the effectiveness of the whole system independent of its special purpose as energy amplifier or as transmutation facility. The present note derives a refined analytical expression for the PAF which reveals more physical details than the expressions given by other authors. Moreover, the traditionally used forms of the static reactor eigenvalue equation and of its adjoint equation are rewritten for subcritical systems and used in the derivation of the expression for the PAF. The derived formula and the modified eigenvalue equations are discussed.

Keywords
Driven subcritical system, Fusion–fission hybrid, Power amplification factor, Static reactor eigenvalue equation
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-190422 (URN)10.1016/j.anucene.2012.06.020 (DOI)000320834800030 ()
Available from: 2013-01-08 Created: 2013-01-08 Last updated: 2017-12-06Bibliographically approved
Ågren, O., Moiseenko, V. E., Noack, K., Hagnestål, A., Källne, J. & Anglart, H. (2013). Hybrid Reactor Studies Based on the Straight Field Line Mirror. Paper presented at Joint Conference of 9th International Conference on Open Magnetic Systems for Plasma Confinement (OS) and 3rd International Workshop on Plasma Material Interaction Facilities for Fusion Research (PMIF), AUG 27-31, 2012, Tsukuba, JAPAN. Fusion science and technology, 63(1T), 52-57
Open this publication in new window or tab >>Hybrid Reactor Studies Based on the Straight Field Line Mirror
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2013 (English)In: Fusion science and technology, ISSN 1536-1055, E-ISSN 1943-7641, Vol. 63, no 1T, p. 52-57Article in journal (Refereed) Published
Abstract [en]

The straight field line mirror (SFLM) hybrid reactor studies aim to identify a concept where the safety of fission power production could be enhanced. A fusion neutron source could become a mean to achieve this. The SFLM studies address critical issues such as reactor safety, natural circulation of coolants, steady state operation for a year or more and means to avoid too strong material loads by a proper geometrical arrangement of the reactor components. A key result is that power production may be possible with a fusion Q factor as low as 0.15. This possibility arises from the high power amplification by fission, which within reactor safety margins may exceed a factor of 100. The requirements on electron temperature are dramatically lower for a fusion hybrid compared to a stand-alone fusion reactor. This and several other factors are important for our choice to select a mirror machine for the fusion hybrid reactor studies.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-224503 (URN)000333412900011 ()
Conference
Joint Conference of 9th International Conference on Open Magnetic Systems for Plasma Confinement (OS) and 3rd International Workshop on Plasma Material Interaction Facilities for Fusion Research (PMIF), AUG 27-31, 2012, Tsukuba, JAPAN
Available from: 2014-05-14 Created: 2014-05-13 Last updated: 2017-12-05Bibliographically approved
Hagnestål, A., Ågren, O. & Moiseenko, V. E. (2013). Radial Confinement in Non-Symmetric Quadrupolar Mirrors. Journal of fusion energy, 32(3), 327-335
Open this publication in new window or tab >>Radial Confinement in Non-Symmetric Quadrupolar Mirrors
2013 (English)In: Journal of fusion energy, ISSN 0164-0313, E-ISSN 1572-9591, Vol. 32, no 3, p. 327-335Article in journal (Refereed) Published
Abstract [en]

Charged particles in symmetric quadrupolar mirrors are radially confined and have an associated radial invariant. In a symmetric quadrupolar field the magnetic field modulus satisfies B(z)=−B(z) along the axis if z = 0 defines the field minimum of the mirror, and the quadrupolar field has a corresponding symmetry. The field in the anchor cells of a tandem mirror need not obey a corresponding symmetry. In this paper, the radial confinement of non-symmetric mirrors is examined by tracing sample ions in the magnetic field. It is found that for non-symmetric mirrors, particles are typically not confined, and no radial invariant exists for such devices. Without attention to this effect in the field and coil design, radial confinement of trapped particles may be lost.

Place, publisher, year, edition, pages
Springer, 2013
Keywords
Quadrupolar mirror machine, radial transport
National Category
Physical Sciences Engineering and Technology
Research subject
Physics with specialization in Space and Plasma Physics; Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-183354 (URN)10.1007/s10894-012-9573-x (DOI)000317973500003 ()
Available from: 2012-10-24 Created: 2012-10-24 Last updated: 2017-12-07Bibliographically approved
Hagnestål, A., Ågren, O. & Moiseenko, V. (2012). A Compact Non-Planar Coil Design for the SFLM Hybrid. Journal of fusion energy, 31(4), 379-388
Open this publication in new window or tab >>A Compact Non-Planar Coil Design for the SFLM Hybrid
2012 (English)In: Journal of fusion energy, ISSN 0164-0313, E-ISSN 1572-9591, Vol. 31, no 4, p. 379-388Article in journal (Refereed) Published
Abstract [en]

A non-planar single layer semiconductor coil set for a version of the Straight Field Line Mirror Hybrid concept with reduced magnetic field has been computed. The coil set consists of 30 coils that are somewhat similar to baseball coils with skewed sides. The coil set has been modeled with filamentary current distributions and basic scaling assumptions have been made regarding the coil widths. This coil set is expected to be considerably cheaper than a previous computed coil set. The coils can probably be produced with technologies known today.

Keywords
Engineering
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-164207 (URN)10.1007/s10894-011-9479-z (DOI)000305524000010 ()
Available from: 2011-12-16 Created: 2011-12-16 Last updated: 2017-12-08Bibliographically approved
Hagnestål, A. (2012). Coil Design and Related Studies for the Fusion-Fission Reactor Concept SFLM Hybrid. (Doctoral dissertation). Uppsala: Acta Universitatis Upsaliensis
Open this publication in new window or tab >>Coil Design and Related Studies for the Fusion-Fission Reactor Concept SFLM Hybrid
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A fusion-fission (hybrid) reactor is a combination of a fusion device and a subcritical fission reactor, where the fusion device acts as a neutron source and the power is mainly produced in the fission core. Hybrid reactors may be suitable for transmutation of transuranic isotopes in the spent nuclear fuel, due to the safety margin on criticality imposed by the subcritical fission core. The SFLM Hybrid project is a theoretical project that aims to point out the possibilities with steady-state mirror-based hybrid reactors. The quadrupolar magnetic mirror vacuum field is based on the Straight Field Line Mirror field and the central cell is 25 m long. A fission mantle surrounds the mirror cell. The fission to fusion power ratio is about 150 with keff = 0.97, implying that almost all the produced energy comes from fission. Beyond each mirror end magnetic expanders are located, which increase the plasma receiving “divertor” area and provide tolerable heat load on wall materials. The plasma is heated with ion cyclotron radio frequency heating and the fission mantle is cooled using a liquid lead-bismuth eutectic. The device is self-sufficient in tritium, and does not seem to suffer from severe material problems. A remaining issue may be the plasma electron temperature, which need to reach about 500 eV for efficient power production.  In this doctoral thesis, theoretical work has been done with the magnetic coil system of such a device and also with the overall concept. A new coil type, the fishbone coil, suitable for single cell quadrupolar mirrors, has been invented. Two vacuum field coil sets with satisfying properties have been found, where the most recent coil set consists of fishbone coils. Finite ß effects on the magnetic field have been investigated, showing that the flux tube ellipticity increases with ß. The ellipticity of the vacuum field increases slightly with radius, but with finite ß it decreases with radius. The maximum flux surface radial extensions decrease with ß, which is an unexpected and beneficial result. A radial invariant has also been identified, and particle simulations have been made to emphasize that quadrupolar mirrors must be symmetric or confinement may be lost.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2012. p. 138
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 991
Keywords
Fusion, Fission, Hybrid reactor, Actinides, Mirror Machine, Quadrupolar mirror, Coils
National Category
Fusion, Plasma and Space Physics
Research subject
Physics
Identifiers
urn:nbn:se:uu:diva-183362 (URN)978-91-554-8521-4 (ISBN)
Public defence
2012-12-10, Polhemssalen, Ångströmslaboratoriet, Lägerhyddsv. 1, Uppsala, 10:15 (English)
Opponent
Supervisors
Available from: 2012-11-19 Created: 2012-10-24 Last updated: 2018-05-29Bibliographically approved
Hagnestål, A., Ågren, O. & Moiseenko, V. (2012). Coil design for the SFLM Hybrid. In: : . Paper presented at 39th EPS Conference & 16th Int. Congress on Plasma Physics. Stockholm, Sweden, 2012
Open this publication in new window or tab >>Coil design for the SFLM Hybrid
2012 (English)Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Stockholm, Sweden, 2012: , 2012
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-190254 (URN)
Conference
39th EPS Conference & 16th Int. Congress on Plasma Physics
Available from: 2013-01-07 Created: 2013-01-07 Last updated: 2015-01-07
Hagnestål, A., Ågren, O. & Moiseenko, V. E. (2012). Coil System For a Mirror-Based Hybrid Reactor. In: Jan Källne, Dimitri Ryutov, Giuseppe Gorini, Carlo Sozzi, Marco Tardocchi (Ed.), Fusion for Neutrons and Subcritical Nuclear Fission: Proceedings of the International Conference. Paper presented at International Workshop on Fusion Neutrons and Subcritical Nuclear Fission (FUNFI), SEP 12-15, 2011, Varenna, ITALY (pp. 217-223).
Open this publication in new window or tab >>Coil System For a Mirror-Based Hybrid Reactor
2012 (English)In: Fusion for Neutrons and Subcritical Nuclear Fission: Proceedings of the International Conference / [ed] Jan Källne, Dimitri Ryutov, Giuseppe Gorini, Carlo Sozzi, Marco Tardocchi, 2012, p. 217-223Conference paper, Published paper (Refereed)
Abstract [en]

Two different superconducting coil systems for the SFLM Hybrid study - a quadrupolar mirror based fusion-fission reactor study - are presented. One coil system is for a magnetic field with 2 T at the midplane and a mirror ratio of four. This coil set consists of semi-planar coils in two layers. The alternative coil system is for a downscaled magnetic field of 1.25 T at the midplane and a mirror ratio of four, where a higher beta is required to achieve sufficient the neutron production. This coil set has one layer of twisted 3D coils. The 3D coils are expected to be considerably cheaper than the semiplanar, since NbTi superconductors can be used for most coils instead of Nb3Sn due to the lower magnetic field.

Series
AIP Conference Proceedings, ISSN 0094-243X ; 1442
Keywords
Hybrid reactor, fusion, fission, superconducting coils, minimum B, magnetic mirror
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-181210 (URN)10.1063/1.4706871 (DOI)000306895100024 ()978-0-7354-1038-1 (ISBN)
Conference
International Workshop on Fusion Neutrons and Subcritical Nuclear Fission (FUNFI), SEP 12-15, 2011, Varenna, ITALY
Available from: 2012-09-24 Created: 2012-09-19 Last updated: 2013-03-04Bibliographically approved
Ekergård, B., Boström, C., Hagnestål, A., Waters, R. & Leijon, M. (2012). Experimental results from a linear wave power generator connected to a resonance circuit. Wiley Interdisciplinary Reviews: Energy and Environment, 2(4), 456-464
Open this publication in new window or tab >>Experimental results from a linear wave power generator connected to a resonance circuit
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2012 (English)In: Wiley Interdisciplinary Reviews: Energy and Environment, ISSN 2041-8396, E-ISSN 2041-840X, Vol. 2, no 4, p. 456-464Article in journal (Refereed) Published
Abstract [en]

The output voltage from a direct-driven permanent magnet linear generator installed in a wave power plant varies both in amplitude and frequency. Electrical conversion is therefore necessary before grid connection can be achieved. The aim of this paper is to present an electrical conversion system based on the electric resonance phenomena. As one of the first steps in the development, and to gain further knowledge and understanding of the proposed resonance circuit, experimental tests with a single-phase permanent magnet linear generator connected to a resonance circuit were performed. The experimental results presented in this paper indicated that a successful resonance between the generator and external circuit was achieved. The research regarding the wave energy converters lies within The Lysekil Wave Power Project at Uppsala University and has been ongoing since 2002.

National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-190112 (URN)10.1002/wene.19 (DOI)000343208400007 ()
Available from: 2013-01-07 Created: 2013-01-07 Last updated: 2017-12-06Bibliographically approved
Ågren, O., Moiseenko, V., Noack, K., Hagnestål, A., Källne, J. & Anglart, H. (2012). Hybrid reactor studies based on the straight field line mirror: Invited talk. Paper presented at International Conference on Open Magnetic Systems for Plasma Confinement (OS, Tsukuba, Japan, August (2012).
Open this publication in new window or tab >>Hybrid reactor studies based on the straight field line mirror: Invited talk
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2012 (English)Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-190436 (URN)
Conference
International Conference on Open Magnetic Systems for Plasma Confinement (OS, Tsukuba, Japan, August (2012)
Available from: 2013-01-08 Created: 2013-01-08 Last updated: 2013-03-04
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