Analysis of activation and damage of ITER material samples expected from DD/DT campaign at JET

Stankūnas, Gediminas; Tidikas, Andrius; Batistoni, P.; Lengar, Igor

doi:10.1016/j.fusengdes.2017.07.013

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…To support ITER and study the impact of neutron irradiation on materials, especially for DT plasmas, several experiments are planned to be performed in the upcoming TT and DT experiential campaigns at JET planned to commence in 2021/22. In preparation for the DT campaign at JET, several important experiments have already been performed [1], such as 14 MeV neutron calibration [2,3], neutronics benchmark experiments [4][5][6][7][8] and activation measurement experiments [9][10][11]. For the preparation of experiments on the neutron induced activation on materials, samples of the main components of the ITER tokamak and dosimetry foils were irradiated during the 2019 C38 Deuterium experimental campaign at JET [12,13].…”

Section: Introductionmentioning

confidence: 99%

Long Term Neutron Activation in JET DD Operation

et al. 2021

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In the 2019 C38 Deuterium-Deuterium campaign at JET several different ITER-relevant materials and dosimetry foils were irradiated in a specially designed long-term irradiation station located inside the vacuum vessel with the purpose of testing the activation of ITER materials by fusion neutrons. The samples were exposed to a neutron fluence of 1.9E14 n/cm2 during JET discharges performed in the experimental campaign over a period of 5 months. Gamma ray spectroscopy measurements were performed on irradiated samples to determine the activation of different long-lived isotopes in the samples. Monte Carlo computational analysis was performed to support the experiment by using the measured neutron yield and irradiation time. In this paper we focus on the computational analysis of the dosimetry foils that are used in order to measure the local neutron energy spectrum and flux. The foils were chosen to cover different neutron energies: thus Yttrium and some of the Nickel and Cobalt reactions were used to determine the Deuterium-Tritium fusion fraction, while Scandium and Iron and some of the Nickel and Cobalt reactions were used for comparison of the computed activity with the experimental measurements. The obtained C/E values show a reasonably good agreement between calculated and measured activity, thus validating the computational methodology and providing the basis for the analysis of the ITER-relevant materials and future experiments performed at JET in the Deuterium-Tritium campaign.

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Section: Introductionmentioning

confidence: 99%

Long Term Neutron Activation in JET DD Operation

et al. 2021

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“…Significant results have been obtained to date with a focus on relevance to ITER device operations [1]. The nuclear activities that have been performed include the 14 MeV calibration of neutron yield monitors [2], neutronics benchmark experiments [3][4][5][6][7], nuclear diagnostics and data processing for tritium breeding blankets [8], and activation measurements with supporting analyses for fusion materials [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Technological exploitation of the JET neutron environment: progress in ITER materials irradiation and nuclear analysis

et al. 2021

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Several experimental activities have been conducted within the ‘ACT’ sub-project under the EUROfusion WPJET3 programme with the purpose to ultimately irradiate ITER materials within the JET D–T neutron environment. The latest results of these activities are presented in this work. The ITER materials include: poloidal field coil jacket samples and toroidal field coil radial closure plate steels, EUROFER 97-2 steel, W and CuCrZr materials from the divertor, Inconel 718, CuCrZr and 316L stainless steel for blanket modules and vacuum vessel forging samples. The experimental results presented here include gamma spectrometry measurements and analysis obtained from post-irradiated samples following the 2019 C38 (D–D) campaign, where a total of 97 samples were irradiated in a newly prepared long-term irradiation station assembly, comprising 27 ITER material samples, 70 dosimetry foils and two combination-foil detectors, known as ‘VERDI’ detectors. Measurements using a range of dosimetry reactions that are present in the IRDFF-II nuclear data file have also been used in preparatory work to characterise the irradiation locations. The latest ITER sample measurement results are presented along with initial comparisons with corresponding neutron transport and activation calculation predictions.

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“…Nuclear technology related experimental activities under the programme provide an important contribution by giving insight on induced activation and damage to ITER materials, nuclear safety, tritium fuel cycle, nuclear waste characterisation and production levels for example. Nuclear activities performed to date include calibration of neutron yield monitors using a 14 MeV neutron generator [3], neutronics benchmark experiments for neutron streaming and shut-down gamma fields [4][5][6][7][8], nuclear diagnostics and data processing for tritium breeding blankets [9], and activation measurements with supporting analyses for fusion materials [10,11]. Data retrieved under the JET experimental program aims to support, develop and lead to the improvement of radiation transport and activation simulation capabilities for fusion materials via benchmarking and validation in fusion-relevant operational conditions.…”

Section: Introductionmentioning

confidence: 99%

Activation of ITER materials in JET: nuclear characterisation experiments for the long-term irradiation station

et al. 2018

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This paper details progress in experimental characterisation work at JET for the long-term irradiation station conducted as part of a project to perform activation experiments using ITER materials. The aim is to take advantage of the significant 14 MeV neutron yield expected during JET operations to irradiate samples of materials that will be used in the manufacturing of ITER tokamak components, such as Nb 3 Sn, SS316L steels from a range of manufac

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Analysis of activation and damage of ITER material samples expected from DD/DT campaign at JET

Cited by 6 publications

References 3 publications

Long Term Neutron Activation in JET DD Operation

Long Term Neutron Activation in JET DD Operation

Technological exploitation of the JET neutron environment: progress in ITER materials irradiation and nuclear analysis

Activation of ITER materials in JET: nuclear characterisation experiments for the long-term irradiation station

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