Efficiency of generation of optical centers in KS-4V and KU-1 quartz glasses at neutron and gamma irradiation

Зарядоперенос между нейтронно-индуцированным и активаторным центрами в монокристалле LuAG : Pr

“…При мощности реактора 10 MWt общий нейтронный поток составлял 10 14 cm −2 s −1 и сопровождался потоком γ-квантов 37 Gy/s•сm 2 с энергиями 0.1−7 MeV. Поток быстрых нейтронов, попадающий на образцы, определялся по наведенной радиоактивности размещенного рядом Fe−Ni-монитора с пороговой энергией E > 2.4 MeV и составлял 3 • 10 13 cm −2 • s −1 [13]. Образцы с мониторами заворачивали в Al-фольгу и помещали в Cd-стакан с толщиной стенок 1 mm, который пропускал только быстрые нейтроны с энергией > 0.…”

Functional materials for tokamak in-vessel systems—status and developments

“…to ≈2000 nm). For the UV-vis-IR range, sapphire (Al 2 O 3 ) and high-purity fused silica (SiO 2 ), are the main candidates for optical diagnostic and remote handling systems (windows, lenses, optical fibres) as these materials show relatively high radiation hardness in terms of maintaining transmission under high levels of ionizing radiation (to >10 Gy s −1 ) and atomic displacements (to >10 10 dpa s −1 ) to doses >10 20 n m −2 and >1 MGy (see annex for basic radiation data), at elevated temperatures (100 °C -200 °C) [60][61][62][63][64][65][66][67][68][69][70][71][72][73]. A potential limitation related to their use is the presence of intense RIL bands, which overlap spectral regions of interest for plasma diagnostics and may obscure the useful signal [5,30,31,69,74,75].…”

“…Even for irradiation at 300 °C the RIA is higher than the RIA at 35 °C [68]. This difference in the E′ defect production efficiency has been related to the hydrogen content [73]. A further disadvantage of the low OH material such as KS-4V is the RIL band at about 450 nm, which is only quenched for irradiations above 300 °C, and the high temperature (⩾650 °C) needed to anneal out the associated E′ 215 nm RIA [31,79].…”