Estimating Time Dependence of Edge Plasma Turbulence in IR-T1 Tokamak

Agah, K. Mikaili; Ghoranneviss, M.; Salem, M. K.; Elahi, A. Salar; Mohammadi, S.; Arvin, R.

doi:10.1007/s10894-012-9563-z

Cited by 11 publications

(5 citation statements)

References 32 publications

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“…Therefore, an accurate determination of plasma column displacement during confinement is essential to transport it to a control system based on feedback. Over the years, different methods have been developed to analyze tokamak plasma equilibrium characteristics (Mukhovatov and Shafranov 1971;Shkarofsky 1982;Lee and Ghoranneviss 2001;Nakamura and Ghoranneviss 2003;Rahimi Rad et al 2009Seo 2009;Ghoranneviss and Salar Elahi 2010;Salar Elahi and Ghoranneviss 2010a, 2010b, 2010cGhanbari et al 2011aGhanbari et al , 2011bSalar Elahi 2011;Goodarzi et al 2013;Mikaili Agah et al 2013). In this paper, we will deduce the plasma current and plasma boundary centers shift using the two semi-empirical techniques in the IR-T1 tokamak.…”

Section: Comparison Between the Tokamak Plasma Current And Boundary Cmentioning

confidence: 99%

“…Therefore, a precise determination of the plasma column shift during confinement is essential to transport it to a control system based on feedback. Over the years, different methods have been developed to analyze the toroidal plasma equilibrium problems (Ghoranneviss and Salar Elahi 2010;Rahimi Rad et al 2010;Salar Elahi and Ghoranneviss 2010c;Ghanbari et al 2011aGhanbari et al , 2011bGhanbari et al , 2012Salar Elahi 2011;Goodarzi et al 2013;Mikaili Agah et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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Application of multipole moments and magnetic techniques for determination of tokamak plasma shift

Elahi

Ghoranneviss

2013

J. Plasma Phys.

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In this contribution, we presented approaches for the determination of tokamak plasma column shift based on multipole moments and magnetic techniques. First, we presented analytical details for using this technique. Then, the principle of different models based on this technique for the design and fabrication of six coils will be presented: four modified Rogowski coils (two cosine coils and two sine coils) and two saddle coils (saddle sine coil and saddle cosine coil). Also, to compare the results, the flux loops technique is used. Because of continuous measurements of magnetic field distribution around the tokamak plasma using multipole coils, this technique gives us more reliable information about the plasma current displacement. Moreover, we deduced the plasma current and plasma boundary centers shift using the two semi-empirical techniques in the IR-T1 tokamak. First, the plasma current center is calculated from the vertical field coil characteristics. The calculation is made focusing on the vertical field coil current and voltage changes due to a horizontal displacement of the plasma column. Also, the plasma boundary center shift was measured from the external magnetic coils. The results from these two techniques are compared and discussed.

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Section: Comparison Between the Tokamak Plasma Current And Boundary Cmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of multipole moments and magnetic techniques for determination of tokamak plasma shift

Elahi

Ghoranneviss

2013

J. Plasma Phys.

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“…However, it needs to exceed a certain value to suppress the radial transport (Spolaore et al 2005;Devynck et al 2006). Many related works on plasma diagnostics have been performed on IR-T1 and other tokamaks (Endler 1995;Wang et al 1995;Burell 1997Burell , 1999Cabral et al 1998;Ritz et al 1998;Silva et al 2002;Viatcheslav et al 2002;Spolaore et al 2005;Bulanin et al 2006;Devynck et al 2006;Emami et al 2009;Salar Elahi et al 2009, 2010, b, c, 2012a2013a, b;Rad et al 2009Rad et al , 2010Ghoranneviss et al 2010a, b;Salar Elahi 2011;Ghanbari et al 2011a, b;Agah et al 2012;Ghanbari et al 2012;Goodarzi et al 2012). This work aims to study the influence of limiter biasing and RHF on turbulent transport on the IR-T1 plasma.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the radial and poloidal turbulent transport in the edge tokamak plasma

Meshkani¹,

Ghoranneviss²,

Lafouti³

et al. 2013

J. Plasma Phys.

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In this paper, turbulent transport in the edge plasma of the IR-T1 tokamak (r/a = 0.9) in the presence of a resonant helical magnetic field (RHF) and a biased limiter has been investigated and analyzed. The time evolution of potential fluctuation, and electric field and turbulent transport have been measured by using two arrays of the Langmuir probes in both the radial and poloidal directions. The experiments have been done in different regimes such as limiter biasing and RHF, and both of them. The analyses have been done by the fast Fourier transport method and their spectral features are obtained with the help of the standard autocorrelation technique. The results show that radial turbulent transport decreases about 60% after positive biasing application, while it increases about 40% after negative biasing. The effect of positive biasing on poloidal turbulent transport displays an increase of about 55%, while the negative bias voltage decreases the poloidal turbulent transport about 30%. Consequently, confinement is improved and plasma density rises significantly due to the applied positive biasing in IR-T1. However, the results are reversed when negative biasing is applied. Also, in this work, the results of the applied RHF (L = 3) are compared with biasing results and analyzed.

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“…[5−12] Fluctuations have often been measured in tokamak experiments using electric and magnetic probes, [13−19] electromagnetic wave scattering, [20−26] microwave reflectometry, [27,28] visible imaging [29−33] or heavy ion beam probes. [34,35] In our previous work, the time profile of these fluctuations was studied, [1] and in this Letter the radial profiles of edge plasma electrical fluctuations are investigated using an array of Langmuir probes (rake probe) in IR-T1 tokamaks. The purpose of this work is to obtain information about the relative electrical fluctuation levels in the edge plasma in IR-T1 tokamaks.…”

mentioning

confidence: 98%

“…Thus, an understanding of edge plasma is important for designing magnetic fusion devices. [1] The energy and particle transport experimentally observed in magnetically confined plasma exceeds neoclassical transport. This transport is termed as anomalous transport.…”

mentioning

confidence: 99%

Estimating the Radial Profile of Edge Plasma Electrical Fluctuations in the IR-T1 Tokamak

Agah¹,

Ghoranneviss²,

Salem³

et al. 2013

Chinese Phys. Lett.

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The radial dependence of edge plasma turbulence is investigated in the IR-T1 tokamak. The radial profile of the fluctuation level and spectra are measured using an array of Langmuir probes (rake probe) in the 𝑟/𝑎 = 0.75-1.2 region. In all radial positions the edge plasma is turbulently unstable, with a broad band fluctuation spectrum in the frequency range 𝑓 = 10-1000 kHz. The relative fluctuation level, as monitored by the ion saturation current 𝐽+, is always highest near the wall and decreases monotonically toward the plasma center, while the shape of the fluctuation power spectra is almost unchanged. The result of this experiment shows that in contrast to the more inner regions, the plasma near the wall does not simply have a small density fluctuation about a mean, but rather a shredded structure in which one can imagine that discrete shreds of plasma interact with one another rather than with the average background.

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Estimating Time Dependence of Edge Plasma Turbulence in IR-T1 Tokamak

Cited by 11 publications

References 32 publications

Application of multipole moments and magnetic techniques for determination of tokamak plasma shift

Application of multipole moments and magnetic techniques for determination of tokamak plasma shift

Analysis of the radial and poloidal turbulent transport in the edge tokamak plasma

Estimating the Radial Profile of Edge Plasma Electrical Fluctuations in the IR-T1 Tokamak

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