SPATIAL AREAS OF POTENTIAL AND DENSITY FLUCTUATION MEARSUMENTS USING HIBP ON THE T-15MD TOKAMAK

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Abstract

The paper presents a numerical analysis of the possibility of performing local measurements of potential and plasma density fluctuations in the T-15MD tokamak using the Heavy Ion Beam Probe (HIBP) diagnostic. Four types of fluctuations are considered in the frequency range up to 500 kHz: Geodesic Acoustic Mode (GAM), Quasi-Coherent Mode (QCM), Tearing Mode (TM), and Alfven eigenmode (AE). For each type of fluctuation, spatial measurement areas are defined for regimes with different values of average density ne and toroidal magnetic field BT. Regimes with flat and peaked density profiles are considered. It is shown that high-Q fluctuations (GAM, AE, TM) can be measured in the peripheral region of the plasma ρ < 0.8 up to density ne ≤ 7 · 1019 m− 3, while low-Q QCMs can be measured up to ne ≤ 5 · 1019 m− 3. In the plasma gradient region ρ = 0.5 – 0.9 the measurement of high-Q fluctuations is possible at a density of ne ≤ 5 · 1019 m− 3, and of the low-Q QCM at a density of ne ≤ 3 · 1019 m− 3.

About the authors

E. A. Vinitskiy

National Research Center “Kurchatov Institute”; National Research Nuclear University “MEPhI”

Email: egor.vinitsky@gmail.com
Moscow, Russia

L. G. Eliseev

National Research Center “Kurchatov Institute”

Moscow, Russia

D. A. Shelukhin

National Research Center “Kurchatov Institute”

Moscow, Russia

Y. M. Ammosov

National Research Center “Kurchatov Institute”; National Research University “MIPT”

Moscow, Russia

A. V. Melnikov

National Research Center “Kurchatov Institute”; National Research Nuclear University “MEPhI”; National Research University “MIPT”

Moscow, Russia

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