Speaker
Mr
Vladimir Vershkov
(Russian Federation)
Description
Two approaches for plasma diffusion studies were compared: low perturbation technique of periodic puff (dn/n_e = 0.3%) and strong puff (dn/n_e < 50%). Core density perturbations can be described in the model with constant in time–constant diffusion coefficients and pinch velocities, while at the edge this model failed. Three phases were distinguished in discharges with strong gas puff. Enhanced electron heat conductivity and lower turbulence frequencies were observed during density ramp up and down, while low electron heat conductivity and higher turbulence frequencies are typical for the intermediate phase. Density profile variation in this phase can be described in the model with constant in time coefficients. The increase of the low frequencies in turbulence spectra was also found in the “density pump out” phase during central ECRH.
Country or International Organization of Primary Author
Russian Federation
Primary author
Mr
Vladimir Vershkov
(Russian Federation)
Co-authors
Mr
Alexandr Danilov
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Mr
Dmitry Ryjakov
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Mr
Dmitry Sergeev
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Dr
Dmitry Shelukhin
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Mr
Eduard Kuleshin
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Mr
Eugenij Gorbunov
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Mr
Georgij Subbotin
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Mr
Kirill Korobov
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Mr
Leonid Kluchnikov
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Mr
Maxim Buldakov
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Dr
Maxim Isaev
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Mr
Mikhail Borisov
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Dr
Natalia Timchenko
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Mr
Sergey Cherkasov
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Mr
Sergey Grashin
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Mr
Sergey Krylov
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Mr
Tatiana Myalton
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Mr
Vadim Krupin
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Mr
Vasiliy Chistiakov
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Mr
Vladimir Trukhin
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Dr
Yuri Dnestronskii
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
Mr
Yuri Skosyrev
(Institute of Tokamak Physics, National Research Center “Kurchatov Institute”)
