Globus-M plasma physics research for fusion application and compact neutron source development

Гусев, В. К.; Bakharev, N. N.; Ber, B. Ya.; Bulanin, V. V.; Чернышев, Ф. В.; Dyachenko, V. V.; Goncharov, P. R.; Gusakov, E. Z.; Iblyaminova, A. D.; Irzak, M. A.; Kaveeva, E.; Khitrov, S. A.; Хромов, Н. А.; Kornev, V. A.; Курскиев, Г. С.; Mel'nik, A.D.; Минаев, В. Б.; Mineev, A. B.; Mironov, M. I.; Novokhatsky, A. N.; Патров, М. И.; Петров, А. В.; Petrov, Yu. V.; Rozhansky, V.; Sakharov, N. V.; Saveliev, A. N.; Senichenkov, I.; Shchegolev, P. B.; Shcherbinin, O. N.; Tolstyakov, S. Yu.; Варфоломеев, В. И.; Voronin, A. V.; Yashin, A. Yu.

doi:10.1088/0741-3335/58/1/014032

Cited by 26 publications

(18 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…GAMs were identified in the spherical tokamak Globus-M [6,7] was discovered as coherent oscillations of perpendicular velocity in 20-35 kHz frequency range provided the backscatter region was located inside the separatrix [8][9][10]. This frequency range was in line with theoretical estimations performed for the conditions of the Globus-M periphery [11].…”

Section: Geodesic Acoustic Modesupporting

confidence: 84%

Recent Doppler backscattering applications in Globus-M tokamak

et al. 2019

View full text Add to dashboard Cite

A: Recently, a four-frequency Doppler backscattering (DBS) system was installed on the Globus-M tokamak. In addition to the classical DBS application for determining the mean plasma rotational velocities, DBS was used for the investigation of different plasma oscillatory processes in the spherical Globus-M tokamak. Application of various DBS data processing allowed us to reveal and investigate plasma oscillations, such as geodesic acoustic mode, limit cycle oscillations and Alfvén modes. It has been shown that DBS also allows registering filament like structures, which manifest as quasi-coherent oscillations in signals of various DBS channels. The multi-frequency DBS system makes it possible to localize plasma oscillations, their poloidal and radial sizes and mode structure. The main results of the DBS application for the study of these oscillations are presented. A comparison of the DBS data with the data of other diagnostics is also given. K: Nuclear instruments and methods for hot plasma diagnostics; Plasma diagnosticsprobes 1Corresponding author.

show abstract

Section: Geodesic Acoustic Modesupporting

confidence: 84%

Recent Doppler backscattering applications in Globus-M tokamak

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Transport quantities and turbulence parameters were provided by the ELMFIRE gyrokinetic code. The modeling results have shown satisfactory agreement with the experiments: (1) in TUMAN-3M the GAM parameters threshold for L-H transition is determined (figure 4), however for FT-2 the transition was not possible for experimental GAM parameter sets [18]; (2) in the case of the pellet injection, L-H transition occurred if a part of the pellet was disintegrated in the pelletguide, resulting in a gas/'snow' puff so that the pellet ablation is peripheral; on the contrary, if the pellet is evaporated deeper in the plasma, there is no L-H transition [19].…”

Section: L-h Transitionsupporting

confidence: 70%

Tokamak research at the Ioffe Institute

et al. 2019

View full text Add to dashboard Cite

Recent research at three small tokamaks with different parameters located at the Ioffe Institute-the spherical tokamak Globus-M, the large aspect ratio tokamak FT-2 and the compact tokamak TUMAN-3M-are reviewed. This overview covers energy confinement (Globus-M and FT-2), L-H transition (TUMAN-3M and FT-2), Alfvén waves (Globus-M and TUMAN-3M), ion cyclotron emission (TUMAN-3M), major plasma discharge disruption (Globus-M) and scrape-off layer (Globus-M) studies. A full-f global gyrokinetic modeling benchmark using synthetic diagnostics in FT-2 is described. Anomalous absorption and emission in electron cyclotron resonance heating experiments due to the parametric excitation of localized upper hybrid waves are analyzed theoretically. Progress in the development of the neutral particle analysis, gamma-ray spectrometry and divertor Thomson scattering combined with laser-induced fluorescence diagnostics for ITER is discussed. The status of the new Globus-M2 spherical tokamak is reported.

show abstract

“…DBS was implemented to study geodesic acoustic modes (GAMs) on the Globus-M tokamak in the Ohmic phase of discharges at relatively low plasma density (n ≈ (2-3) × 10 19 m −3 ) when the toroidal ion drift was directed away from the X-point [35][36][37]. All DBS systems (see Table 1) and in some experiments even their combinations were used to obtain information about various properties of GAMs presented in Table 3 (see the end of Section 3.1).…”

Section: Geodesic Acoustic Modementioning

confidence: 99%

“…It was shown that an SMBI pulse can reduce the Doppler shift frequency, which corresponds to the flattening of the electric field. In a series of experiments on the EAST tokamak using two separate DBS systems, one for the Q-band (33)(34)(35)(36)(37)(38)(39)(40)(41)(42)(43)(44)(45)(46)(47)(48)(49)(50) and the other for the V-band (50-75 GHz), Doppler shifted signals were obtained and radial profiles of perpendicular velocities were computed for the L-and H-mode [15]. In the Globus-M2 tokamak, the first results of the Doppler backscattering diagnostics during a discharge with the L-H transition show that the transition process is linked to the deformation of the poloidal rotation velocity profile [16].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

View full text Add to dashboard Cite

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.

show abstract

Globus-M plasma physics research for fusion application and compact neutron source development

Cited by 26 publications

References 27 publications

Recent Doppler backscattering applications in Globus-M tokamak

Recent Doppler backscattering applications in Globus-M tokamak

Tokamak research at the Ioffe Institute

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

Contact Info

Product

Resources

About