We have subjected a silica core fiber optic cable to 4 years of low-level neutron and gamma radiation from Princeton`s TFTR controlled fusion experiment The accumulated dose was 200 Gy. As a result of the radiation, we have measured increased attenuations of 100--300 db/km in the visible part of the spectrum, and a decrease of the numerical aperture. An attempt to decrease this damage by photobleaching failed. We argue that this failure is not unexpected, since the rate of damage is so slow and the time scale so long that the self-annealing process keeps the residual damage at the irreducible …
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We have subjected a silica core fiber optic cable to 4 years of low-level neutron and gamma radiation from Princeton`s TFTR controlled fusion experiment The accumulated dose was 200 Gy. As a result of the radiation, we have measured increased attenuations of 100--300 db/km in the visible part of the spectrum, and a decrease of the numerical aperture. An attempt to decrease this damage by photobleaching failed. We argue that this failure is not unexpected, since the rate of damage is so slow and the time scale so long that the self-annealing process keeps the residual damage at the irreducible level seen in other experiments. The implications of these findings for controlled fusion diagnostics during upcoming experiments with highly reactive deuterium-tritium plasmas are discussed.
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Ramsey, A. T.; Adler, H. G. & Hill, K. W.Reduced optical transmission of SiO{sub 2} fibers used in controlled fusion diagnostics,
report,
February 1, 1993;
New Jersey.
(https://digital.library.unt.edu/ark:/67531/metadc1315792/:
accessed July 16, 2024),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.