Use of mesh based variance reduction technique for shielding calculations of the stellarator power reactor HELIAS

André Häußler; Ulrich Fischer; Felix Warmer

doi:10.1016/j.fusengdes.2019.01.052

Use of mesh based variance reduction technique for shielding calculations of the stellarator power reactor HELIAS

André Häußler (Corresponding author)
, Ulrich Fischer
, Felix Warmer

Research output: Contribution to journal › Article › Academic › peer-review

5 Citations (Scopus)

Abstract

The shielding capability is an important aspect of a fusion power plant. The neutron flux decreases in areas far away from the plasma chamber while at the same time the statistical error in Monte Carlo particle transport simulations increases significantly in such regions. This requires variance reduction methods to guide the particles in regions of interest and improve the statistical accuracy. The mesh based weight window technique, applied with ADVANTG, is investigated in this paper and successfully applied for the first neutronic investigation of the shielding performance for the HELIAS stellarator. The obtained results are in an area with high neutron wall load and reduced material thickness. They will be evaluated against the design requirements specified for the EU DEMO tokamak fusion reactor. The results show that the current HELIAS design cannot fulfill the shielding limits specified for DEMO in the investigated area, which is mainly due to the limited space available in the stellarator and should be overcome by improved design solutions for blanket and shield.Save

Original language	English
Pages (from-to)	671-675
Number of pages	5
Journal	Fusion Engineering and Design
Volume	146
DOIs	https://doi.org/10.1016/j.fusengdes.2019.01.052
Publication status	Published - Sept 2019
Externally published	Yes

Bibliographical note

Funding Information:
This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053 . The views and opinions expressed herein do not necessarily reflect those of the European Commission.

Funding Information:
This work was performed on the computational resource ForHLR II funded by the Ministry of Science, Research and the Arts Baden-Württemberg and DFG ("Deutsche Forschungsgemeinschaft") .

Funding

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053 . The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work was performed on the computational resource ForHLR II funded by the Ministry of Science, Research and the Arts Baden-Württemberg and DFG ("Deutsche Forschungsgemeinschaft") . This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work was performed on the computational resource ForHLR II funded by the Ministry of Science, Research and the Arts Baden-W?rttemberg and DFG (?Deutsche Forschungsgemeinschaft?).

Keywords

CAD
DAGMC
HELIAS
Neutronics
Variance reduction

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10.1016/j.fusengdes.2019.01.052

Cite this

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title = "Use of mesh based variance reduction technique for shielding calculations of the stellarator power reactor HELIAS",

abstract = "The shielding capability is an important aspect of a fusion power plant. The neutron flux decreases in areas far away from the plasma chamber while at the same time the statistical error in Monte Carlo particle transport simulations increases significantly in such regions. This requires variance reduction methods to guide the particles in regions of interest and improve the statistical accuracy. The mesh based weight window technique, applied with ADVANTG, is investigated in this paper and successfully applied for the first neutronic investigation of the shielding performance for the HELIAS stellarator. The obtained results are in an area with high neutron wall load and reduced material thickness. They will be evaluated against the design requirements specified for the EU DEMO tokamak fusion reactor. The results show that the current HELIAS design cannot fulfill the shielding limits specified for DEMO in the investigated area, which is mainly due to the limited space available in the stellarator and should be overcome by improved design solutions for blanket and shield.Save",

keywords = "CAD, DAGMC, HELIAS, Neutronics, Variance reduction",

author = "Andr{\'e} H{\"a}u{\ss}ler and Ulrich Fischer and Felix Warmer",

note = "Funding Information: This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053 . The views and opinions expressed herein do not necessarily reflect those of the European Commission. Funding Information: This work was performed on the computational resource ForHLR II funded by the Ministry of Science, Research and the Arts Baden-W{\"u}rttemberg and DFG ({"}Deutsche Forschungsgemeinschaft{"}) . ",

year = "2019",

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doi = "10.1016/j.fusengdes.2019.01.052",

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AU - Häußler, André

AU - Fischer, Ulrich

AU - Warmer, Felix

N1 - Funding Information: This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053 . The views and opinions expressed herein do not necessarily reflect those of the European Commission. Funding Information: This work was performed on the computational resource ForHLR II funded by the Ministry of Science, Research and the Arts Baden-Württemberg and DFG ("Deutsche Forschungsgemeinschaft") .

PY - 2019/9

Y1 - 2019/9

N2 - The shielding capability is an important aspect of a fusion power plant. The neutron flux decreases in areas far away from the plasma chamber while at the same time the statistical error in Monte Carlo particle transport simulations increases significantly in such regions. This requires variance reduction methods to guide the particles in regions of interest and improve the statistical accuracy. The mesh based weight window technique, applied with ADVANTG, is investigated in this paper and successfully applied for the first neutronic investigation of the shielding performance for the HELIAS stellarator. The obtained results are in an area with high neutron wall load and reduced material thickness. They will be evaluated against the design requirements specified for the EU DEMO tokamak fusion reactor. The results show that the current HELIAS design cannot fulfill the shielding limits specified for DEMO in the investigated area, which is mainly due to the limited space available in the stellarator and should be overcome by improved design solutions for blanket and shield.Save

AB - The shielding capability is an important aspect of a fusion power plant. The neutron flux decreases in areas far away from the plasma chamber while at the same time the statistical error in Monte Carlo particle transport simulations increases significantly in such regions. This requires variance reduction methods to guide the particles in regions of interest and improve the statistical accuracy. The mesh based weight window technique, applied with ADVANTG, is investigated in this paper and successfully applied for the first neutronic investigation of the shielding performance for the HELIAS stellarator. The obtained results are in an area with high neutron wall load and reduced material thickness. They will be evaluated against the design requirements specified for the EU DEMO tokamak fusion reactor. The results show that the current HELIAS design cannot fulfill the shielding limits specified for DEMO in the investigated area, which is mainly due to the limited space available in the stellarator and should be overcome by improved design solutions for blanket and shield.Save

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KW - DAGMC

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KW - Neutronics

KW - Variance reduction

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DO - 10.1016/j.fusengdes.2019.01.052

M3 - Article

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SN - 0920-3796

VL - 146

SP - 671

EP - 675

JO - Fusion Engineering and Design

JF - Fusion Engineering and Design

ER -

Use of mesh based variance reduction technique for shielding calculations of the stellarator power reactor HELIAS

Abstract

Bibliographical note

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Keywords

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