title: ÐÐ·Ð¼ÐµÑÐµÐ½Ð¸Ðµ Ð¿Ð°ÑÐ°Ð¼ÐµÑÑÐ¾Ð² Ð¿ÑÐ¸Ð³ÑÐ°Ð½Ð¸ÑÐ½Ð¾Ð¹ Ð¿Ð»Ð°Ð·Ð¼Ñ ÑÐ¾ÐºÐ°Ð¼Ð°ÐºÐ° Ð¤Ð¢-2 Ð² ÑÐ°Ð·Ð»Ð¸ÑÐ½ÑÑ ÑÐµÐ¶Ð¸Ð¼Ð°Ñ ÐµÐ³Ð¾ ÑÐ°Ð±Ð¾ÑÑ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Measurement of the edge plasma parameters of the FT-2 tokamak in various modes of its operation
Creators: name: ÐÐµÑÑÐ±Ð¸Ð½Ð°, ÐÐ°ÑÐ³Ð°ÑÐ¸ÑÐ°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2024
Subjects: ÑÐ¾ÐºÐ°Ð¼Ð°Ðº
Ð¿ÑÐ¸ÑÑÐµÐ½Ð¾ÑÐ½Ð°Ñ Ð¿Ð»Ð°Ð·Ð¼Ð°
Ð»ÐµÐ½Ð³Ð¼ÑÑÐ¾Ð²ÑÐºÐ¸Ð¹ Ð·Ð¾Ð½Ð´
Ð°Ð½ÑÐµÐ½Ð½Ð°-Ð³ÑÐ¸Ð»Ð»
Ð²ÑÑÐ¾ÐºÐ¾ÑÐ°ÑÑÐ¾ÑÐ½Ð°Ñ (ÐÐ§) Ð²Ð¾Ð»Ð½Ð°
Ð´Ð¾Ð¿Ð¾Ð»Ð½Ð¸ÑÐµÐ»ÑÐ½ÑÐ¹ Ð³Ð°Ð·Ð¾Ð½Ð°Ð¿ÑÑÐº
Ð¸Ð¼Ð¿ÑÐ»ÑÑÐ½ÑÐ¹ ÐºÐ»Ð°Ð¿Ð°Ð½
Ð¸Ð¾Ð½Ð½ÑÐ¹ ÑÐ¾Ðº Ð½Ð°ÑÑÑÐµÐ½Ð¸Ñ
ÐºÐ¾Ð½ÑÐµÐ½ÑÑÐ°ÑÐ¸Ñ ÑÐ»ÐµÐºÑÑÐ¾Ð½Ð¾Ð²
tokamak
edge plasma
langmuir probe
grill antenna
high frequency (HF) wave
additional gas inlet
pulse valve
ion saturation current
electron density

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description: The given work is devoted to the study of the parameters of the edge plasma of the FT-2 tokamak. Plasma parameters in the boundary region (SOL) affect plasma pa-rameters in the main retention volume. In particular, the effectiveness of the interac-tion of high frequency low hybrid waves with the tokamak plasma depends on the electron density gradient in the SOL region near the antenna location. The work was performed by measuring the parameters of the edge plasma using probe diagnostic. The FT-2 tokamak probe diagnostic includes two movable five-electrode probes, but only one probe is used in this work (in the low part of the chamber). This paper presents experimental evidence for the presence of toroidal inhomogeneity of plasma parameters (electron density and temperature) in the wall region. The above-mentioned inhomogeneity of parameters is observed for the ohmic regime and for the regime with additional (high frequency) heating. The location of the pulse valve of the additional gas inlet affects the plasma parameters near the grill antenna. The paper shows that an additional gas inlet directly near the grill antenna leads to a decrease in the gradient of the electron density near the frontal area of the antenna. This helps to improve the antennaâs connection with the plasma and suppress para-metric instability.Â  During the work, the effect of a sharp decrease in the ion saturation current on the probe located near the grill antenna was discovered. This may indicate a decrease in plasma density under the action of an EM wave.