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Measurements of Fluctuating Plasma Rotation Velocity by Means of Correlation and Doppler Microwave Reflectometry in Uragan-3m Torsatron
| Content Provider | Semantic Scholar |
|---|---|
| Author | Skibenko, A. I. Pavlichenko, O. S. Ocheretenko, V. L. Pinos, I. B. Prokopenko, A. V. Tarasov, Igor K. Tsybenko, S. A. Volkov, Evgeny |
| Copyright Year | 2005 |
| Abstract | Studies of fluctuating plasma rotation by means of correlation and Doppler microwave reflectometry in the Uragan3M torsatron were carried out. The application of two methods makes it possible to broaden the information about the rotation and structure of poloidal plasma oscillations. The correlation method has an advantage in l=3 torsatron, because this one is practically insensitive to the tilt angle of incident mm - ray to the reflecting surface. The pulsation of the poloidal velocity and the position of plasma layer in the region of magnetic islands were observed, that became stable upon the formation of the ITB. PACS: 52.55.Hc The measurements of plasma rotation in E×H fields in tokamaks and stellarators are essential in studying the formation of the transport barriers which determine the energy and plasma particles transport [1]. Recently, the transitions to the enhanced mode of the particle and plasma energy confinement, with the formation of the internal transport barrier (ITB), were reported on Uragan-3M (U-3M) torsatron [2]. When studying this phenomenon, the phase, spectral, and correlation measurements of the reflected microwaves were used to determine the plasma profile and characteristics of its fluctuations. The correlation microwave reflectometry has been used to determine the velocity of plasma rotation in U-3M previously [3]. The method is based on measurement of the time shift/period of cross-correlation function (CCF) of two microwave signals reflected from the layer areas of equal density that are shifted either in toroidal or poloidal direction. The method is practically insensitive to the tilt angle between the mm-ray and the reflecting surface. This is particularly important for the case of probing with Xwave for which the orientation of the reflection surface is defined by density as well as by magnetic field. The direction of rotation is determined by the relation of the obtained CCF shift when CCF 12 is changed to CCF 21 : the bigger shift corresponds to the longer distance between the reflecting areas and vice versa. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://vant.kipt.kharkov.ua/ARTICLE/VANT_2005_1/article_2005_1_200.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
