Main challenges for ITER optical diagnostics

The review is made of the problems of ITER optical diagnostics. Most of these problems will be related to the intensive neutron radiation from hot plasma. At a high level of radiation loads the most types of materials gradually change their properties. This effect is most critical for optical diagno...

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Bibliographic Details
Main Authors: Yu, Vukolov K, Orlovskiy, I I, Alekseev, A G, Borisov, A A, Andreenko, E N, Kukushkin, A B, Lisitsa, V S, Neverov, V S
Format: Conference Proceeding
Language:English
Subjects:
Charge exchange
Degradation
DIVERTORS
FIRST WALL
HOT PLASMA
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
IRRADIATION
ITER TOKAMAK
MIRRORS
NEUTRONS
Nuclear reactors
Optical properties
Plasma
SILICA
Silica glass
Silicon dioxide
Stray light
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Summary:The review is made of the problems of ITER optical diagnostics. Most of these problems will be related to the intensive neutron radiation from hot plasma. At a high level of radiation loads the most types of materials gradually change their properties. This effect is most critical for optical diagnostics because of degradation of optical glasses and mirrors. The degradation of mirrors, that collect the light from plasma, basically will be induced by impurity deposition and (or) sputtering by charge exchange atoms. Main attention is paid to the search of glasses for vacuum windows and achromatic lens which are stable under ITER irradiation conditions. The last results of irradiation tests in nuclear reactor of candidate silica glasses KU-1, KS-4V and TF 200 are presented. An additional problem is discussed that deals with the stray light produced by multiple reflections from the first wall of the intense light emitted in the divertor plasma.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4894046