Use of lithium capillary structures in Ohmic discharges of T-10 Tokamak
- Authors: Vershkov V.A.1, Sarychev D.V.1, Shelukhin D.A.1, Nemets A.R.1, Mirnov S.V.2, Lyublinski I.E.3, Vertkov A.V.3, Zharkov M.Y.3
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Affiliations:
- National Research Center “Kurchatov Institute”
- Troitsk Institute for Innovation and Fusion Research
- Dollezhal Research and Development Institute of Power Engineering
- Issue: Vol 50, No 3 (2024)
- Pages: 243-270
- Section: TOKAMAKS
- URL: https://archivog.com/0367-2921/article/view/668857
- DOI: https://doi.org/10.31857/S0367292124030018
- EDN: https://elibrary.ru/RGKCPK
- ID: 668857
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Abstract
The results of experiments at the T-10 tokamak using lithium capillary-porous structures are presented. It is shown that lithium sputtering under conditions of graphite diaphragms can significantly reduce deuterium recycling and the level of impurities in the plasma. At the same time, recycling increases significantly five discharges after the start of the day of the experiment, and the effect of reducing the level of impurities persists for 150—300 discharges. The results of using a capillary-porous structure with lithium filling as a movable rail diaphragm in the T-10 configuration with tungsten main diaphragms are presented. The introduction of a lithium diaphragm into the SOL region makes it possible to reduce recycling and obtain discharges with an effective plasma charge approaching unity. In this case, the effect increases as the lithium sputtered in the chamber is accumulated. It is shown experimentally that a capillary-porous structure with lithium filling can be used as a main diaphragm with longitudinal plasma heat fluxes up to 3.6 MW/m2. However, a necessary condition is the complete impregnation of the porous structure with lithium and the prevention of extrusion of lithium into the discharge as a result of the interaction of the current flowing to the diaphragm with the toroidal magnetic field. Experiments have shown that to obtain discharges with a small lithium admixture, a strong gas injection of deuterium or impurity is required to reduce the temperature of the plasma periphery and effective cooling of the diaphragm below 450 ŰC. Otherwise, the diaphragm transfers into a strong evaporation mode with high lithium flows, which lead to a significant increase in the lithium concentration in the plasma. Strong evaporation reduces the heat inflow and stabilizes the diaphragm temperature.
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About the authors
V. A. Vershkov
National Research Center “Kurchatov Institute”
Author for correspondence.
Email: V.Vershkov@fc.iterru.ru
Russian Federation, Moscow
D. V. Sarychev
National Research Center “Kurchatov Institute”
Email: V.Vershkov@fc.iterru.ru
Russian Federation, Moscow
D. A. Shelukhin
National Research Center “Kurchatov Institute”
Email: V.Vershkov@fc.iterru.ru
Russian Federation, Moscow
A. R. Nemets
National Research Center “Kurchatov Institute”
Email: V.Vershkov@fc.iterru.ru
Russian Federation, Moscow
S. V. Mirnov
Troitsk Institute for Innovation and Fusion Research
Email: V.Vershkov@fc.iterru.ru
Russian Federation, Moscow
I. E. Lyublinski
Dollezhal Research and Development Institute of Power Engineering
Email: V.Vershkov@fc.iterru.ru
Russian Federation, Moscow
A. V. Vertkov
Dollezhal Research and Development Institute of Power Engineering
Email: V.Vershkov@fc.iterru.ru
Russian Federation, Moscow
M. Yu. Zharkov
Dollezhal Research and Development Institute of Power Engineering
Email: V.Vershkov@fc.iterru.ru
Russian Federation, Moscow
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