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Approaches for the Qualification of Exhaust Solutions for DEMO-class Devices

A W Morris, Llion Evans Orcid Logo, J R Harrison, B Lipschultz, S McIntosh, E Surrey, C Waldon

26th IAEA Fusion Energy Conference

Swansea University Author: Llion Evans Orcid Logo

Abstract

Plasma exhaust is a critical aspect of DEMO-class devices, so there needs to be confidence that it will work. This paper considers the methodology to establish confidence in potential solutions, drawing on approaches inside and outside fusion, including evolving high power computing tools – these ap...

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Published in: 26th IAEA Fusion Energy Conference
Published: Kyoto, Japan IAEA FEC 2016 2016
Online Access: https://conferences.iaea.org/indico/event/98/session/31/contribution/521
URI: https://cronfa.swan.ac.uk/Record/cronfa39997
first_indexed 2018-05-08T13:53:14Z
last_indexed 2018-05-15T12:35:45Z
id cronfa39997
recordtype SURis
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spelling 2018-05-15T12:03:44.9752883 v2 39997 2018-05-08 Approaches for the Qualification of Exhaust Solutions for DEMO-class Devices 74dc5084c47484922a6e0135ebcb9402 0000-0002-4964-4187 Llion Evans Llion Evans true false 2018-05-08 ACEM Plasma exhaust is a critical aspect of DEMO-class devices, so there needs to be confidence that it will work. This paper considers the methodology to establish confidence in potential solutions, drawing on approaches inside and outside fusion, including evolving high power computing tools – these approaches could also help find improved solutions, , possibly where all the plasma and materials ingredients operate in known regimes, reducing uncertainty. Crucially, the elements need to be integrated into an overall solution that can meet the demanding performance requirements and constraints of a fusion plant yet also accommodate significant uncertainties in plasma, materials and component behaviour.A prior full scale test of a DEMO exhaust solution is not feasible, almost by definition. The reference approach is to take the best available design, with various uncertainties and unknowns, and use margins and risk mitigation tools to address these. We explore a complementary approach based on models for the final step to give more confidence in the performance and uncertainty range of the design. The two approaches could be combined.For the plasma aspects, qualification will be eased if solutions have resilience to uncertainties and variations, ideally with natural “springiness”, or damping of transients. These can be tested with integrated models containing all relevant mechanisms and interactions, suitably validated.Materials and components have comparable modelling and integration challenges, in particular predicting the effects of combined loads (e.g. neutron, thermal, mechanical). A possible strategy is to combine measured and predicted materials properties and failure mechanisms (such as crack propagation, deformation) into a hierarchical multiscale model from atom-scale up. Such a modelling workflow would be well suited to high levels of parallelisation and would improve over use of average material properties.In-silico qualification of such a large and complex system is very challenging, but has large potential benefits in cost, time, flexibility and optimisation. Fortunately essentially all science issues are being addressed in the community (e.g. in EUROfusion). The computational demands are excessive today, but the rapid development of both computing power and numerical techniques is likely to transform the situation in the next 10-20 years. Conference Paper/Proceeding/Abstract 26th IAEA Fusion Energy Conference IAEA FEC 2016 Kyoto, Japan 31 10 2016 2016-10-31 https://conferences.iaea.org/indico/event/98/session/31/contribution/521 COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University 2018-05-15T12:03:44.9752883 2018-05-08T11:13:17.4340214 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering A W Morris 1 Llion Evans 0000-0002-4964-4187 2 J R Harrison 3 B Lipschultz 4 S McIntosh 5 E Surrey 6 C Waldon 7
title Approaches for the Qualification of Exhaust Solutions for DEMO-class Devices
spellingShingle Approaches for the Qualification of Exhaust Solutions for DEMO-class Devices
Llion Evans
title_short Approaches for the Qualification of Exhaust Solutions for DEMO-class Devices
title_full Approaches for the Qualification of Exhaust Solutions for DEMO-class Devices
title_fullStr Approaches for the Qualification of Exhaust Solutions for DEMO-class Devices
title_full_unstemmed Approaches for the Qualification of Exhaust Solutions for DEMO-class Devices
title_sort Approaches for the Qualification of Exhaust Solutions for DEMO-class Devices
author_id_str_mv 74dc5084c47484922a6e0135ebcb9402
author_id_fullname_str_mv 74dc5084c47484922a6e0135ebcb9402_***_Llion Evans
author Llion Evans
author2 A W Morris
Llion Evans
J R Harrison
B Lipschultz
S McIntosh
E Surrey
C Waldon
format Conference Paper/Proceeding/Abstract
container_title 26th IAEA Fusion Energy Conference
publishDate 2016
institution Swansea University
publisher IAEA FEC 2016
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering
url https://conferences.iaea.org/indico/event/98/session/31/contribution/521
document_store_str 0
active_str 0
description Plasma exhaust is a critical aspect of DEMO-class devices, so there needs to be confidence that it will work. This paper considers the methodology to establish confidence in potential solutions, drawing on approaches inside and outside fusion, including evolving high power computing tools – these approaches could also help find improved solutions, , possibly where all the plasma and materials ingredients operate in known regimes, reducing uncertainty. Crucially, the elements need to be integrated into an overall solution that can meet the demanding performance requirements and constraints of a fusion plant yet also accommodate significant uncertainties in plasma, materials and component behaviour.A prior full scale test of a DEMO exhaust solution is not feasible, almost by definition. The reference approach is to take the best available design, with various uncertainties and unknowns, and use margins and risk mitigation tools to address these. We explore a complementary approach based on models for the final step to give more confidence in the performance and uncertainty range of the design. The two approaches could be combined.For the plasma aspects, qualification will be eased if solutions have resilience to uncertainties and variations, ideally with natural “springiness”, or damping of transients. These can be tested with integrated models containing all relevant mechanisms and interactions, suitably validated.Materials and components have comparable modelling and integration challenges, in particular predicting the effects of combined loads (e.g. neutron, thermal, mechanical). A possible strategy is to combine measured and predicted materials properties and failure mechanisms (such as crack propagation, deformation) into a hierarchical multiscale model from atom-scale up. Such a modelling workflow would be well suited to high levels of parallelisation and would improve over use of average material properties.In-silico qualification of such a large and complex system is very challenging, but has large potential benefits in cost, time, flexibility and optimisation. Fortunately essentially all science issues are being addressed in the community (e.g. in EUROfusion). The computational demands are excessive today, but the rapid development of both computing power and numerical techniques is likely to transform the situation in the next 10-20 years.
published_date 2016-10-31T19:24:27Z
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score 11.04748

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