Speaker
Mr
Alexey Razdobarin
(Ioffe Physical-Technical Institute of the Russian Academy of Sciences)
Description
The large distance between ITER vacuum windows and the plasma boundary necessitates the use of in-vessel optical diagnostic components. High particle fluxes, temperature and radiation level expected inside ITER imposes considerable limitations on mirrors design. The choice of FM (First Mirrors) structure and material depends on the mirror location and on the diagnostic needs.
The presentation covers the most general approaches to the FM problem in ITER and demonstrates the implantation of basic concepts in the design of FM in the divertor Thomson scattering system. The FM design options and their advantages and disadvantages in different operation conditions expected in ITER are discussed along with new results on the development of optics cleaning and deposition-mitigating techniques. The focus is on the efficiency of plasma cleaning combined with blowing out contaminations. The impact of plasma treatment on the mirror surface is also dicussed. The parameters of cleaning capacitively-coupled discharge in working ITER gas – deuterium were calculated within the hydrodynamic model and experimentally verified. The blowing-out efficiency has been estimated for the prototype of the divertor laser launcher duct. The implementation of other protection and cleaning techniques, like laser cleaning, heating and shutters is considered.
Country or International Organization of Primary Author
Russian Federation
Collaboration (if applicable, e.g., International Tokamak Physics Activities)
ITER Activities,International Tokamak Physics Activities
Primary author
Mr
Alexey Razdobarin
(Ioffe Physical-Technical Institute of the Russian Academy of Sciences)
Co-authors
Prof.
Aleksander Smirnov
(Saint-Petersburg State Polytechnic University)
Prof.
Alexander Gorodetsky
(Frumkin Institute of Physical Chemistry and Electrochemistry)
Prof.
Alexander Zakharov
(Frumkin Institute of Physical Chemistry and Electrochemistry, Moscow)
Mr
Alexey Berezutsky
(Ioffe Physico Technical Institute)
Dr
Alla Sitnikova
(Ioffe Physico Technical Institute)
Dr
Andrei Alekseev
(National Research Centre “Kurchatov Institute”)
Mr
Daniil Kirilenko
(Ioffe Physico Technical Institute)
Dr
Eugene Mukhin
(Ioffe Physical Technical institute)
Mr
Evgeniy Khilkevitch
(Saint-Petersburg State Polytechnic University)
Mr
Gleb Kurskiev
(Ioffe Physico Technical Institute)
Dr
Igor Arkhipov
(Frumkin Institute of Physical Chemistry and Electrochemistry)
Dr
Ilia Orlovskiy
(National Research Centre “Kurchatov Institute”)
Mr
Ivan Ryzhkov
(National Science Centre, Kharkov Institute of Physics and Technology)
Prof.
Konstantin Vukolov
(National Research Centre “Kurchatov Institute”)
Dr
Mikhail Kochergin
(Ioffe Physico Technical Institute)
Mrs
Olga Skorik
(National Science Centre, Kharkov Institute of Physics and Technology)
Mr
Pavel Chernakov
(Ioffe Physical Technical Institute)
Dr
Phillip Andrew
(ITER Organization)
Dr
Rinad Zalavutdinov
(Frumkin Institute of Physical Chemistry and Electrochemistry)
Mr
Sergei Masyukevich
(Ioffe Physico Technical Institute)
Dr
Sergei Tolstyakov
(Ioffe Physico Technical Institute)
Dr
Tatjana Chernoiziumskaya
(Saint-Petersburg State Polytechnic University)
Dr
Valentin Bukhovets
(Frumkin Institute of Physical Chemistry and Electrochemistry)
Dr
Vladimir Konovalov
(National Science Centre, Kharkov Institute of Physics and Technology)
Dr
Vladimir Semenov
(Ioffe Physical Technical Institute)
Prof.
Vladimir Voitsenya
(National Science Centre, Kharkov Institute of Physics and Technology)
Dr
Vladislav Bondarenko
(National Science Centre, Kharkov Institute of Physics and Technology)
