GAM observation in the TUMAN-3M tokamak

Bulanin, V. V.; Askinazi, L. G.; Belokurov, A. A.; Kornev, V. A.; Лебедев, С. В.; Петров, А. В.; Tukachinsky, A. S.; Vildjunas, M. I.; Wagner, F.; Yashin, A. Yu.

doi:10.1088/0741-3335/58/4/045006

Cited by 19 publications

(33 citation statements)

References 53 publications

(103 reference statements)

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“…Radial propagation of the GAMs has been observed experimentally in several devices [9]- [21]. Unidirectional outward propagating GAMs have been observed in JFT-2M [9], TEXTOR [11], DIII-D [13], HL-2A [14], JET [15], and COMPASS [16].…”

Section: Introductionmentioning

confidence: 93%

“…Inward propagation of the GAMs has been observed in FT-2 [17], and ASDEX-Upgrade [18]. Standing wave or coexistence of the inward and outward propagation has been observed in HT-7 [19], ISTTOK [20], TUMAN-3M [21], and ASDEX Upgrade [18]. The standing wave patterns has been observed near the separatrix due to the boundary effect has been observed in JFT-2M [9,10,12].…”

Section: Introductionmentioning

confidence: 99%

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Propagation direction of geodesic acoustic modes driven by drift wave turbulence

Sasaki¹,

Itoh²,

Kobayashi³

et al. 2018

Nucl. Fusion

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Selection rule of the radial propagation direction of geodesic acoustic modes (GAMs) is investigated. Here, we study the influence of nonlinear coupling with drift wave turbulence on propagation direction of GAMs. Based on wave-kinetic equation for the turbulence, the phase-space dynamics is numerically solved and the nonlinear saturated states are obtained, where the phase-space consists of the real space and the wavenumber space. A wave pattern of the GAM in a nonlinear saturated state varies to form a standing wave, outward and inward propagating waves, depending on the peak radial wavenumber of the turbulence. The impact of nonlinear coupling with turbulence is discussed by deriving the GAM dispersion relation that includes the effect of the turbulence.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Propagation direction of geodesic acoustic modes driven by drift wave turbulence

Sasaki¹,

Itoh²,

Kobayashi³

et al. 2018

Nucl. Fusion

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“…GAM oscillations are observed in low-density discharges in TUMAN-3M [7,8] and FT-2 [9,10] tokamaks. GAM in TUMAN-3M usually exist as a series of short bursts; in most GAM discharges LH-transition is observed, simultaneous with GAM decay.…”

Section: Gam Scenariosmentioning

confidence: 94%

“…Another factor necessary for LH-transition is threshold heating power [4,5] and threshold density (and thus particle source) [1,6]. Experiments on Ioffe Institute tokamaks TUMAN-3M and FT-2 provide wide range of scenarios with radial electric field and particle source perturbation [6,[7][8][9][10][11]. The interplay between the particle and heat source, Er shear and turbulence level could be analyzed using the theory of LH-transition initiation [12].…”

Section: Introductionmentioning

confidence: 99%

LH-transition initiation and dynamics in a conventional tokamak

Abdullina

Askinazi

Belokurov

et al. 2019

AIP Conference Proceedings

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Radial electric field shear is crucial for turbulence suppression and transition to the H-mode, although the high shear value alone may not be sufficient for the LH-transition initiation. Temporal and spatial parameters of shear perturbation, particle source and turbulence parameters are the main factors responsible for LH-transition initiation. Different plasma discharge scenarios in two Ioffe Institute conventional tokamaks are analyzed using the model of plasma density and ion temperature evolution to clear up the role of aforementioned factors.

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“…More specifically the study of a variety of oscillating processes was performed using DBS. For example, for the investigation of the high-frequency branch of zonal flows-the geodesic acoustic mode-the DBS diagnostics were used on JET [17,18], ASDEX Upgrade [19], HL-2A [20], EAST [21], DIII-D [22], TUMAN-3M [23], and other devices [24]. Doppler backscattering has also proved useful for the study of limit cycle oscillations whose typical frequency is significantly lower than that of the geodesic acoustic mode frequency.…”

Section: Introductionmentioning

confidence: 99%

Review of Advanced Implementation of Doppler Backscattering Method in Globus-M

et al. 2021

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Doppler backscattering (DBS) is a microwave diagnostics method typically used to study the plasma rotation velocity. Apart from conventional techniques, more advanced forms of DBS implementation were suggested on Globus-M. More specifically the study of a variety of oscillating processes was performed using DBS. In this review we present a detailed description of all of the methods and techniques employed in Globus-M alongside results obtained using DBS in all the years up until the shutdown of the tokamak. These include research similar to that done on other devices into the properties of such phenomena like geodesic acoustic modes or limit cycle oscillations, along with innovative works regarding the detection and investigation of Alfven eigenmodes and filaments that were the first of their kind and that provided important and novel results. Apart from that, the specific aspects of DBS application on a spherical tokamak are discussed. An in-depth look into the gradual change and improvement of the DBS diagnostics on Globus-M is also presented in this paper.

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GAM observation in the TUMAN-3M tokamak

Cited by 19 publications

References 53 publications

Propagation direction of geodesic acoustic modes driven by drift wave turbulence

Propagation direction of geodesic acoustic modes driven by drift wave turbulence

LH-transition initiation and dynamics in a conventional tokamak

Review of Advanced Implementation of Doppler Backscattering Method in Globus-M

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