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Hagnestål, Anders
Publications (10 of 28) 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, 094008- p.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.

Keyword
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, 261-266 p.Article 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.

Keyword
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, 52-57 p.Article 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, 327-335 p.Article 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
Keyword
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, 379-388 p.Article 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.

Keyword
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., 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, 217-223 p.Conference 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
Keyword
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, 456-464 p.Article 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
Ågren, O., Moiseenko, V. E., Noack, K. & Hagnestål, A. (2012). Radial Drift Invariant In Long-Thin Mirrors. In: Jan Källne, Dimitri Ryutov, Giuseppe Gorini, Carlo Sozzi, Marco Tardocchi (Ed.), Fusion for Neutrons and Subcritical Nuclear Fission: Fusion for Neutrons and Subcritical Nuclear Fission. Paper presented at International Workshop on Fusion Neutrons and Subcritical Nuclear Fission (FUNFI), SEP 12-15, 2011, Varenna, ITALY (pp. 255-258). .
Open this publication in new window or tab >>Radial Drift Invariant In Long-Thin Mirrors
2012 (English)In: Fusion for Neutrons and Subcritical Nuclear Fission: Fusion for Neutrons and Subcritical Nuclear Fission / [ed] Jan Källne, Dimitri Ryutov, Giuseppe Gorini, Carlo Sozzi, Marco Tardocchi, 2012, 255-258 p.Conference paper, Published paper (Refereed)
Abstract [en]

In omnigenous systems, the guiding centers are constrained to move on magnetic surfaces. Since a magnetic surface is determined by a constant radial Clebsch coordinate, omnigenuity implies that the guiding center radial coordinate (the Clebsch coordinate) is constant. Near omnigenuity is probably a requirement for high quality confinement and in such systems only small oscillatory radial banana guiding center excursions from the average drift surface occur. The guiding center radial coordinate is then the leading order term for a more precise radial drift invariant I-r, where higher order corrections arise from the oscillatory "banana ripple" associated with the excursions from the mean drift magnetic surface. An analytical expression for the radial invariant is derived for long-thin quadrupolar mirror equilibria. The formula for the invariant is then used in a Vlasov distribution function. To model radial density profiles, it is necessary to use the radial invariant (the parallel invariant is insufficient for this). The results are also compared with standard fluid approaches. In several aspects, the fluid and Vlasov system with the radial invariant give analogous formulas. One difference is that the parallel current associated with finite banana widths could be derived from the radial invariant.

Series
AIP Conference Proceedings, ISSN 0094-243X ; 1442
Keyword
Mirror machine, constant of motion, radial invariant
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-181211 (URN)10.1063/1.4706876 (DOI)000306895100029 ()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
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