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2 results on '"plasma rotation"'

1. Influence of the safety factor variation on exitation of resonant magnetic perturbation in TOKAMAK rotating edge plasmas

Author

Igor Pankratov, Ivan Pavlenko, O. Pomazan, and A. Omelchenko

Subjects
resonant magnetic perturbations, edge localized modes, plasma rotation, tokamak, Physics, QC1-999
Abstract

Recently the possibility of resonant excitation of pressure perturbation by external helical magnetic perturbations near the rotating plasma edge was shown taking into consideration the finite plasma conductivity. In present paper the influence of the small safety factor variation on the pressure perturbation and on the plasma current response is studied. This phenomenon may explain the existence of the small window of safety factor values where ELMs were completely eliminated. The possibility to control the plasma current response to penetration of external helical resonant magnetic perturbations into the edge plasmas is shown. The investigation is carried out in the frame of one-fluid MHD.

Published
2013

2. Investigation of poloidal inhomogeneity of E × B plasma rotation in the FT-2 tokamak

Subjects
полоидальная неоднородность E × B вращения, микроволновое рассеяние, poloidal asymmetry of E × B rotation, корреляционное усиленное рассеяние, correlative enhanced scattering, enhanced backscattering in the upper hybrid resonance, обратное усиленное рассеяние в Ð²ÐµÑ€Ñ Ð½ÐµÐ¼ гибридном резонансе, microwave scattering, plasma rotation, вращение плазмы
Abstract

Целью данной работы является проведение измерений скорости E × B вращения плазмы в токамаке ФТ-2 при Ñ€Ð°Ð·Ð»Ð¸Ñ‡Ð½Ñ‹Ñ Ð¿Ð¾Ð»Ð¾Ð¸Ð´Ð°Ð»ÑŒÐ½Ñ‹Ñ Ð¿Ð¾Ð»Ð¾Ð¶ÐµÐ½Ð¸ÑÑ Ñ‚Ð¾Ñ‡ÐºÐ¸ рассеяния с использованием корреляционной диагностики допплеровского усиленного рассеяния. В результате данной работы была обнаружена сильная полоидальная неоднородность скорости E × B вращения плазмы. Значения скорости, полученные при Ð¿Ð¾Ð»Ð¾Ð¸Ð´Ð°Ð»ÑŒÐ½Ñ‹Ñ Ð¿Ð¾Ð»Ð¾Ð¶ÐµÐ½Ð¸ÑÑ Ñ‚Ð¾Ñ‡ÐºÐ¸ рассеяния выше экватора, оказались в 4–7 раз больше, чем при Ð¿Ð¾Ð»Ð¾Ð¶ÐµÐ½Ð¸ÑÑ Ð½Ð¸Ð¶Ðµ экватора. Данный эффект сильнее проявлялся ближе к центру плазмы нежели к периферии., The aim of this work is to measure velocity of E × B plasma rotation in FT-2 tokamak at various poloidal positions of scattering point, using the correlative diagnostic of Doppler enhanced scattering. As a result of this work, a strong poloidal inhomogeneity of E × B plasma rotation was discovered. The velocities obtained at the poloidal positions of the scattering point above the equator turned out to be 4–7 times higher than at the positions below the equator. This effect was more pronounced closer to the center of the plasma than to the periphery.

Published
2021
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