Artículo
Long-term fuel retention and release in JET ITER-Like Wall at ITER-relevant baking temperatures
Autor/es | Heinola, K.
Likonen, J. Ahlgren, T. Brezinsek, S. De Temmerman, G. Jet Contributors García Muñoz, Manuel |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Fecha de publicación | 2017-08 |
Fecha de depósito | 2020-08-25 |
Publicado en |
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Resumen | The fuel outgassing efficiency from plasma-facing components exposed in JET-ILW has been
studied at ITER-relevant baking temperatures. Samples retrieved from the W divertor and
Be main chamber were annealed at 350 and ... The fuel outgassing efficiency from plasma-facing components exposed in JET-ILW has been studied at ITER-relevant baking temperatures. Samples retrieved from the W divertor and Be main chamber were annealed at 350 and 240 °C, respectively. Annealing was performed with thermal desoprtion spectrometry (TDS) for 0, 5 and 15 h to study the deuterium removal effectiveness at the nominal baking temperatures. The remained fraction was determined by emptying the samples fully of deuterium by heating W and Be samples up to 1000 and 775 °C, respectively. Results showed the deposits in the divertor having an increasing effect to the remaining retention at temperatures above baking. Highest remaining fractions 54 and 87% were observed with deposit thicknesses of 10 and 40 μm, respectively. Substantially high fractions were obtained in the main chamber samples from the deposit-free erosion zone of the limiter midplane, in which the dominant fuel retention mechanism is via implantation: 15 h annealing resulted in retained deuterium higher than 90%. TDS results from the divertor were simulated with TMAP7 calculations. The spectra were modelled with three deuterium activation energies resulting in good agreement with the experiments |
Identificador del proyecto | 633053 |
Cita | Heinola, K., Likonen, J., Ahlgren, T., Brezinsek, S., De Temmerman, G., Jet Contributors, y García Muñoz, M. (2017). Long-term fuel retention and release in JET ITER-Like Wall at ITER-relevant baking temperatures. Nuclear Fusion, 57, 1-6. |
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