Beryllium global erosion and deposition at JET-ILW simulated with ERO2.0

J. Romazanov; S. Brezinsek; D. Borodin; M. Groth; S. Wiesen; A. Kirschner; A. Huber; A. Widdowson; Markus Airila; A. Eksaeva; I. Borodkina; Ch. Linsmeier; JET Contributors

doi:10.1016/j.nme.2019.01.015

Beryllium global erosion and deposition at JET-ILW simulated with ERO2.0

J. Romazanov^*, S. Brezinsek, D. Borodin, M. Groth, S. Wiesen, A. Kirschner, A. Huber, A. Widdowson, Markus Airila, A. Eksaeva, I. Borodkina, Ch. Linsmeier, JET Contributors

^*Corresponding author for this work

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

50 Citations (Scopus)

Abstract

The recently developed Monte-Carlo code ERO2.0 is applied to the modelling of limited and diverted discharges at JET with the ITER-like wall (ILW). The global beryllium (Be) erosion and deposition is simulated and compared to experimental results from passive spectroscopy. For the limiter configuration, it is demonstrated that Be self-sputtering is an important contributor (at least 35%) to the Be erosion. Taking this contribution into account, the ERO2.0 modelling confirms previous evidence that high deuterium (D) surface concentrations of up to ∼50% atomic fraction provide a reasonable estimate of Be erosion in plasma-wetted areas. For the divertor configuration, it is shown that drifts can have a high impact on the scrape-off layer plasma flows, which in turn affect global Be transport by entrainment and lead to increased migration into the inner divertor. The modelling of the effective erosion yield for different operational phases (ohmic, L- and H-mode) agrees with experimental values within a factor of two, and confirms that the effective erosion yield decreases with increasing heating power and confinement.

Original language	English
Pages (from-to)	331-338
Journal	Nuclear Materials and Energy
Volume	18
DOIs	https://doi.org/10.1016/j.nme.2019.01.015
Publication status	Published - 2019
MoE publication type	Not Eligible

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 authors gratefully acknowledge the computing time granted by the JARA-HPC Vergabegremium on the supercomputer JURECA at Forschungszentrum Jülich.

Keywords

Beryllium
ERO2.0
Erosion
JET ITER-like wall

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.nme.2019.01.015Licence: CC BY

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title = "Beryllium global erosion and deposition at JET-ILW simulated with ERO2.0",

abstract = "The recently developed Monte-Carlo code ERO2.0 is applied to the modelling of limited and diverted discharges at JET with the ITER-like wall (ILW). The global beryllium (Be) erosion and deposition is simulated and compared to experimental results from passive spectroscopy. For the limiter configuration, it is demonstrated that Be self-sputtering is an important contributor (at least 35%) to the Be erosion. Taking this contribution into account, the ERO2.0 modelling confirms previous evidence that high deuterium (D) surface concentrations of up to ∼50% atomic fraction provide a reasonable estimate of Be erosion in plasma-wetted areas. For the divertor configuration, it is shown that drifts can have a high impact on the scrape-off layer plasma flows, which in turn affect global Be transport by entrainment and lead to increased migration into the inner divertor. The modelling of the effective erosion yield for different operational phases (ohmic, L- and H-mode) agrees with experimental values within a factor of two, and confirms that the effective erosion yield decreases with increasing heating power and confinement.",

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author = "J. Romazanov and S. Brezinsek and D. Borodin and M. Groth and S. Wiesen and A. Kirschner and A. Huber and A. Widdowson and Markus Airila and A. Eksaeva and I. Borodkina and Ch. Linsmeier and {JET Contributors}",

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AU - Romazanov, J.

AU - Brezinsek, S.

AU - Borodin, D.

AU - Groth, M.

AU - Wiesen, S.

AU - Kirschner, A.

AU - Huber, A.

AU - Widdowson, A.

AU - Airila, Markus

AU - Eksaeva, A.

AU - Borodkina, I.

AU - Linsmeier, Ch.

AU - JET Contributors

PY - 2019

Y1 - 2019

N2 - The recently developed Monte-Carlo code ERO2.0 is applied to the modelling of limited and diverted discharges at JET with the ITER-like wall (ILW). The global beryllium (Be) erosion and deposition is simulated and compared to experimental results from passive spectroscopy. For the limiter configuration, it is demonstrated that Be self-sputtering is an important contributor (at least 35%) to the Be erosion. Taking this contribution into account, the ERO2.0 modelling confirms previous evidence that high deuterium (D) surface concentrations of up to ∼50% atomic fraction provide a reasonable estimate of Be erosion in plasma-wetted areas. For the divertor configuration, it is shown that drifts can have a high impact on the scrape-off layer plasma flows, which in turn affect global Be transport by entrainment and lead to increased migration into the inner divertor. The modelling of the effective erosion yield for different operational phases (ohmic, L- and H-mode) agrees with experimental values within a factor of two, and confirms that the effective erosion yield decreases with increasing heating power and confinement.

AB - The recently developed Monte-Carlo code ERO2.0 is applied to the modelling of limited and diverted discharges at JET with the ITER-like wall (ILW). The global beryllium (Be) erosion and deposition is simulated and compared to experimental results from passive spectroscopy. For the limiter configuration, it is demonstrated that Be self-sputtering is an important contributor (at least 35%) to the Be erosion. Taking this contribution into account, the ERO2.0 modelling confirms previous evidence that high deuterium (D) surface concentrations of up to ∼50% atomic fraction provide a reasonable estimate of Be erosion in plasma-wetted areas. For the divertor configuration, it is shown that drifts can have a high impact on the scrape-off layer plasma flows, which in turn affect global Be transport by entrainment and lead to increased migration into the inner divertor. The modelling of the effective erosion yield for different operational phases (ohmic, L- and H-mode) agrees with experimental values within a factor of two, and confirms that the effective erosion yield decreases with increasing heating power and confinement.

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Beryllium global erosion and deposition at JET-ILW simulated with ERO2.0

Abstract

Funding

Keywords

UN SDGs

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