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 n and toroidal magnetic field B. 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 n ≤ 7 · 10 m, while low-Q QCMs can be measured up to n ≤ 5 · 10 m. In the plasma gradient region ρ = 0.5 – 0.9 the measurement of high-Q fluctuations is possible at a density of n ≤ 5 · 10 m, and of the low-Q QCM at a density of n ≤ 3 · 10 m.
Vinitskiy et al. (Wed,) studied this question.