Long Term Neutron Activation in JET DD Operation

EPJ Web of Conferences

Snoj Luka¹  Batistoni Paola²  Loreti Stefano²  Pillon Mario²  Conroy Sean³  Stamatelatos Ion E.⁴  Vasilopoulou Theodora⁴  Savva Marilia I.⁴  Kos Bor⁵  Čufar Aljaž⁵  Lengar Igor⁵  Štancar Žiga⁵  Radulović Vladimir⁵  Mietelski Jerzy W.⁶  Kierepko Renata⁶  Wójcik-Gargula Anna⁶  Packer Lee W.⁷  Nobs Chantal R.⁷ 

[1] ;Department of Fusion and Technologies of Nuclear Safety and Security, ENEA C. R. Frascati;Department of Physics and Astronomy, Uppsala University;INRASTES, NCSR ‘Demokritos’;Reactor Physics Department, Jožef Stefan Institute;The Henryk Niewodniczanski Institute of Nuclear Physics (IFJ PAN), Polish Academy of Sciences;United Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science Centre, Abingdon;

关键词: jet;    long term neutron irradiation;    mcnp;   

DOI  :  10.1051/epjconf/202125303005

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown