Speaker
Dr
B.S. Fayzullaev
(Institute of Nuclear Physics Academy of Sciences of Uzbekistan, Tashkent 100214, Uzbekistan)
Description
The pure quartz glasses of KS-4V type are one of the key materials for the
optical diagnostics system of plasma in ITER. The goal of the experiment was
determination of the nature and formation mechanism of the color centers with the
optical absorption bands in the range of 660-680 nm, induced in quartz glasses of
KS-4V and KI types with irradiating -quanta of 60Со at power 2.5 Gy/s, and
temperatures 77, 273 и 310 К in the dose range 30 - 104 Gy. The band of 665 nm
is more efficiently induced in the KI samples that contain more metallic impurities
(<10 ppm), than the KS-4V (<0,1ppm). The studies of the stability induced in KS-
4Vcenters shows that during period of 50 minutes at room temperature, 665 nm
band is attenuated by about 50% and it is thermally stable at <300 K and at 323 K
≥ is fully annealed. Amount of destroyed joints of M-O-Si≡ with formation of the
new unstable centers М+ ≡Al3+ O-–Si≡ with the band 665 nm at the radiation dose
of 7.4×103 Gy increases to a maximum and then decreases due to radiation damage
(instability). Gamma induced band of optical absorption in the glass of KS-4V type
at 665 nm, along with well-known 550 and 620 nm, can lead to the distortion of
diagnosable signals in visible transparency field in comparison with KU-1 type
glass.
Author
Dr
B.S. Fayzullaev
(Institute of Nuclear Physics Academy of Sciences of Uzbekistan, Tashkent 100214, Uzbekistan)
Co-authors
Dr
A.Kh. Islamov
(Institute of Nuclear Physics Academy of Sciences of Uzbekistan, Tashkent 100214, Uzbekistan)
Dr
I. Nuritdinov
(Institute of Nuclear Physics Academy of Sciences of Uzbekistan, Tashkent 100214, Uzbekistan)
