Measuring the isotope effect on the gross beryllium erosion in JET

E. De La Cal; D. Borodin; I. Borodkina; D. Douai; E. Pawelec; A. Shaw; S. Silburn; I. Balboa; S. Brezinsek; P. Carvalho; T. Dittmar; A. Huber; V. Huber; J. Karhunen; U. Losada; A. Manzanares; J. Romazanov; A. Tookey; J. E.T. Contributors

doi:10.1088/1741-4326/ac8aae

Measuring the isotope effect on the gross beryllium erosion in JET

E. De La Cal, D. Borodin, I. Borodkina, D. Douai, E. Pawelec, A. Shaw, S. Silburn, I. Balboa, S. Brezinsek, P. Carvalho, T. Dittmar, A. Huber, V. Huber, J. Karhunen, U. Losada, A. Manzanares, J. Romazanov, A. Tookey, J. E.T. Contributors

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Abstract

The isotope effect, hydrogen (H) versus deuterium (D), on the gross beryllium (Be) erosion yield has been measured in ohmic limiter plasmas in JET tokamak by spectroscopic means. A simplified method to extract the effective sputtering yield from the quotient of the radiances of the D α or D 3 and the Be II lines at 527 nm was applied. A clear isotope effect has been found, the erosion yield of D being about a factor of 2 larger compared to H in the whole explored plasma density range. This is in agreement with physical sputtering data obtained with H+ and D+ ion beams and also with material surface computer simulations. The already published contribution of chemically assisted physical sputtering has been also identified here. Currently the study is being extended to tritium (T) and D-T plasmas and the effect of helium mixtures.

Original language	English
Article number	126021
Journal	Nuclear Fusion
Volume	62
Issue number	12
DOIs	https://doi.org/10.1088/1741-4326/ac8aae
State	Published - Dec 2022
Externally published	Yes

Bibliographical note

Publisher Copyright:
© EURATOM 2022.

Funding

This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No. 101052200—EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them.

Funders	Funder number
European Commission	101052200—EUROfusion

Keywords

JET
beryllium
erosion
isotope
limiter
spectroscopy
sputtering

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10.1088/1741-4326/ac8aae

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De La Cal, E., Borodin, D., Borodkina, I., Douai, D., Pawelec, E., Shaw, A., Silburn, S., Balboa, I., Brezinsek, S., Carvalho, P., Dittmar, T., Huber, A., Huber, V., Karhunen, J., Losada, U., Manzanares, A., Romazanov, J., Tookey, A., & Contributors, J. E. T. (2022). Measuring the isotope effect on the gross beryllium erosion in JET. Nuclear Fusion, 62(12), Article 126021. https://doi.org/10.1088/1741-4326/ac8aae

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abstract = "The isotope effect, hydrogen (H) versus deuterium (D), on the gross beryllium (Be) erosion yield has been measured in ohmic limiter plasmas in JET tokamak by spectroscopic means. A simplified method to extract the effective sputtering yield from the quotient of the radiances of the D α or D 3 and the Be II lines at 527 nm was applied. A clear isotope effect has been found, the erosion yield of D being about a factor of 2 larger compared to H in the whole explored plasma density range. This is in agreement with physical sputtering data obtained with H+ and D+ ion beams and also with material surface computer simulations. The already published contribution of chemically assisted physical sputtering has been also identified here. Currently the study is being extended to tritium (T) and D-T plasmas and the effect of helium mixtures.",

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De La Cal, E, Borodin, D, Borodkina, I, Douai, D, Pawelec, E, Shaw, A, Silburn, S, Balboa, I, Brezinsek, S, Carvalho, P, Dittmar, T, Huber, A, Huber, V, Karhunen, J, Losada, U, Manzanares, A, Romazanov, J, Tookey, A & Contributors, JET 2022, 'Measuring the isotope effect on the gross beryllium erosion in JET', Nuclear Fusion, vol. 62, no. 12, 126021. https://doi.org/10.1088/1741-4326/ac8aae

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Measuring the isotope effect on the gross beryllium erosion in JET

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