Bert Giesen
Research Subjects
Bert Giesen has a total of 27 co-authors. Here are the top co-authors by number of shared publications:
- Olaf Neubauer
Forschungszentrum Julich, Inst Energie & Klimaforsch Plasmaphys, Partner Trilateral Euregio Cluster TEC, D-52425 Julich, Germany
4 shared publications - Guntram Czymek
Forschungszentrum Jülich
3 shared publications A. Panin
2 shared publicationsA. Charl
1 shared publicationA. Hiller
1 shared publicationAlexander Chudnovskij
Russian Research Center “Kurchatov Institute” 123182, Kurchatov sq. 1, Moscow; Russia
1 shared publication
Latest Publications
- 1 October 2015
- Published by Elsevier in Fusion Engineering and Design
- Vol. 96-97, 624-628
Development of an ITER prototype disruption mitigation valve
- 1 October 2015
- Published by Elsevier in Fusion Engineering and Design
- Vol. 96-97, 624-628
Development of an ITER prototype disruption mitigation valve
- 1 June 2013
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 1-8
Approaches to numerical modeling in development process of complex structures for fusion devices
Development of components for fusion device normally comprises numerous simulations to validate their design compatibility with the specified loads according to applicable codes and standards. A strategy of multifield finite element analyses is determined by an iterative nature of design process, and a level of a structure complexity dictates analysis approaches and modeling technique. Nowadays powerful software exploiting the strength of modern computers allows simulating structures in a very detailed way, even for some types of coupled field analyses. As some drawback of this tendency, many efficient numerical tools, used in the past, are not frequently engaged. Sometimes huge numerical resources are spent to solve trivial problems. Direct CAD-analysis meshing of structures in all their complexity may mix effects of different importance and may lead to overlooking some key structure features. Computational problems with convergence in nonlinear analyses often make modeling less flexible to design changes. This paper gives examples of engineering simplified modeling made with clear understanding of an analysis goal and a role of simulations in design process, like for the W7-X stellarator busbar system. Engineering methods to perform multifield analysis including electromagnetic transients for some ITER diagnostics are also presented. An engineering material model to calculate steel superconducting structures working in inelastic range is discussed.
- 1 June 2013
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 1-8
Approaches to numerical modeling in development process of complex structures for fusion devices
Development of components for fusion device normally comprises numerous simulations to validate their design compatibility with the specified loads according to applicable codes and standards. A strategy of multifield finite element analyses is determined by an iterative nature of design process, and a level of a structure complexity dictates analysis approaches and modeling technique. Nowadays powerful software exploiting the strength of modern computers allows simulating structures in a very detailed way, even for some types of coupled field analyses. As some drawback of this tendency, many efficient numerical tools, used in the past, are not frequently engaged. Sometimes huge numerical resources are spent to solve trivial problems. Direct CAD-analysis meshing of structures in all their complexity may mix effects of different importance and may lead to overlooking some key structure features. Computational problems with convergence in nonlinear analyses often make modeling less flexible to design changes. This paper gives examples of engineering simplified modeling made with clear understanding of an analysis goal and a role of simulations in design process, like for the W7-X stellarator busbar system. Engineering methods to perform multifield analysis including electromagnetic transients for some ITER diagnostics are also presented. An engineering material model to calculate steel superconducting structures working in inelastic range is discussed.
- 1 October 2007
- Published by Elsevier in Fusion Engineering and Design
- Vol. 82 (5) , 1467-1472
Design aspects of the joints for the bus bar system of the Wendelstein 7-X stellarator
- 1 October 2007
- Published by Elsevier in Fusion Engineering and Design
- Vol. 82 (5) , 1467-1472
Design aspects of the joints for the bus bar system of the Wendelstein 7-X stellarator
- 1 March 1997
- Published by Taylor & Francis in Fusion Technology
- Vol. 31 (2) , 154-158
Measurement of the Vertical Magnetic Field in TEXTOR Using the Electron Beam Technique
The results of the poloidal field (PF) coil efficiency measurements and the values for stray field compensation during premagnetization are presented. The results have been verified by field calculations and compared with plasma breakdown experiments.Determination of the vertical field in the plasma center produced by PF coils is essential for the definition of breakdown conditions and for the control of the horizontal plasma position and of the plasma shape in tokamaks.The electron beam technique has been chosen for the measurements, providing sufficient precision and visibility. Magnetic field lines became visible due to the effect of electron movement in a magnetic field and light emission in a gas.Vertical fields were determined from the measured toroidal field and vertical electron beam displacements. Precise determination of the values for the stray field compensation was achieved by detection of very low stray fields from the deflection of the electron beam.
- 1 March 1997
- Published by Taylor & Francis in Fusion Technology
- Vol. 31 (2) , 154-158
Measurement of the Vertical Magnetic Field in TEXTOR Using the Electron Beam Technique
The results of the poloidal field (PF) coil efficiency measurements and the values for stray field compensation during premagnetization are presented. The results have been verified by field calculations and compared with plasma breakdown experiments.Determination of the vertical field in the plasma center produced by PF coils is essential for the definition of breakdown conditions and for the control of the horizontal plasma position and of the plasma shape in tokamaks.The electron beam technique has been chosen for the measurements, providing sufficient precision and visibility. Magnetic field lines became visible due to the effect of electron movement in a magnetic field and light emission in a gas.Vertical fields were determined from the measured toroidal field and vertical electron beam displacements. Precise determination of the values for the stray field compensation was achieved by detection of very low stray fields from the deflection of the electron beam.