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

Autor: K.Yu. Vukolov, I. Nuritdinov, B. S. Fayzullaev, U.S. Salikhbaev, I.I. Orlovskiy, E. M. Ibragimova, A. Kh. Islamov
Rok vydání: 2013
Předmět:
Zdroj: Journal of Nuclear Materials. 443:393-397
ISSN: 0022-3115
DOI: 10.1016/j.jnucmat.2013.07.027
Popis: Pure quartz glasses of KS-4V and KU-1 types are candidates for optical plasma diagnostic system in ITER. The purpose of experiment was to study the efficiency of defect production in these glasses under irradiation with 60 Со γ -quanta (5.7 Gy/s) dose range of 10 2 –10 7 Gy and the fission reactor neutrons in the fluency range of 10 20 –10 23 n/m 2 and gammas simulating the plasma influence. In KU-1 (1000 ppm OH) the accumulation kinetics of E ′-(5.75 eV) and NBO-(1.9 eV) centers at γ - doses ⩾ 5 × 10 5 Gy and neutron fluencies 21 n/m 2 is faster, than that in KS-4V glasses ( 10 21 n/m 2 the NBO accumulation kinetics is slower in KU-1 than in KS-4B, because highly mobile hydrogen atoms access to the generated NBO centers. In KS-4V irradiated to γ -doses10 2 –5 × 10 3 Gy a new unstable absorption band at 1.8 eV was found, which is caused by the glass synthesis conditions and alkali metal impurities. The transparency at 3.5–6.2 eV at fluencies 10 20 –5 × 10 21 n/m 2 is higher in KS-4V than KU-1. However at fluencies >10 21 n/m 2 in KS-4V the photoluminescence band at 2.7 eV is more intensive and distorts a diagnosed signal. The transparency in 3.5–1.2 eV at fluencies >10 21 n/m 2 is higher in KU-1 than KS-4V.
Databáze: OpenAIRE
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