March 2024
·
2 Reads
Technical Physics Letters
What is this page?
This page lists the scientific contributions of an author, who either does not have a ResearchGate profile, or has not yet added these contributions to their profile.
It was automatically created by ResearchGate to create a record of this author's body of work. We create such pages to advance our goal of creating and maintaining the most comprehensive scientific repository possible. In doing so, we process publicly available (personal) data relating to the author as a member of the scientific community.
If you're a ResearchGate member, you can follow this page to keep up with this author's work.
If you are this author, and you don't want us to display this page anymore, please let us know.
Publications (153)
![Figure 4. Comparison of the primary ion beam with measured by wire array detector (red squares) and modeled by QuickField Student Edition Freeware [23] code (black circles) for different focusing voltages.](https://www.researchgate.net/publication/366339289/figure/fig1/AS:11431281115136728@1674773800035/Comparison-of-the-primary-ion-beam-with-measured-by-wire-array-detector-red-squares-and_Q320.jpg)
December 2022
·
58 Reads
Atoms
Heavy Ion Beam Probing (HIBP) diagnostic is a powerful tool for electric field studies in the hot dense plasma of modern-day toroidal magnetic confinement devices. On the TUMAN-3M tokamak, the HIBP have been used in regimes with improved plasma confinement to clear up the role of the radial electric field in the transition to good confinement regimes. Recently, a modernization of the TUMAN-3M HIBP diagnostics was performed, aiming to reconfigure it for a work with a reversed plasma current direction and improvement of the overall stability of the diagnostic. The results of the first measurements of the plasma potential in the co-NBI scenario are reported and discussed.
![Figure 4. Comparison of the primary ion beam with measured by wire array detector (red squares) and modeled by SIMON [12] code (black circles), for different focusing voltages.](https://www.researchgate.net/profile/L-Askinazi/publication/365146138/figure/fig4/AS:11431281113376043@1673880032204/Comparison-of-the-primary-ion-beam-with-measured-by-wire-array-detector-red-squares-and_Q320.jpg)
October 2022
·
12 Reads
Heavy Ion Beam Probing (HIBP) diagnostic is a powerful tool for electric field studies in hot dense plasma of modern day toroidal magnetic confinement devices. On the TUMAN-3M to-kamak, the HIBP have been used in regimes with improved plasma confinement to clear up the role of radial electric field in the transition to good confinement regimes. Recently, a moderni-zation of the TUMAN-3M HIBP diagnostics was performed aiming to reconfigure it for a work with a reversed plasma current direction and improvement of overall stability of the diagnostic. The results of first measurements of plasma potential in co-NBI scenario are reported and dis-cussed.
January 2022
·
3 Reads
·
1 Citation
Technical Physics Letters
The heavy ion beam probe (HIBP) diagnostics at the TUMAN-3M tokamak was updated to provide measurements in the regime with neutral beam injection co-directed with plasma current (co-NBI). By means of HIBP, plasma potential measurements in the center of plasma were carried out. Plasma potential evolution in the discharge with the LH transition (transition to the improved confinement mode) is in good agreement with the concept of negative radial electric field generation during formation of the transport barrier. Keywords: plasma physics, tokamak, heavy ion beam probe, H-mode, neutral beam injection.
December 2021
·
12 Reads
·
1 Citation
Technical Physics Letters
November 2021
·
11 Reads
·
3 Citations
Technical Physics Letters
April 2021
·
43 Reads
·
2 Citations
The Review of scientific instruments
A compact neutron spectrometer based on the BC-501A liquid organic scintillator was applied to neutron measurements at the TUMAN-3M tokamak. The spectrometer was calibrated using measurements from the ion beam of the cyclotron accelerator. Neutron spectra were measured during discharges using a neutral deuterium beam injection into the TUMAN-3M D-plasma. An energy distribution of the neutrons from the plasma that hit the spectrometer was obtained from the measured BC-501A instrumental spectra by the DeGaSum code using detector response functions obtained in the course of the calibration. This allowed for the estimation of the 2.45 MeV neutron yield and the evaluation of both the time evolution of the DD fusion rate and the characteristic time of the injected deuterium slowing down in discharges with neutral beam injection heating.
February 2021
·
12 Reads
Technical Physics Letters
November 2020
·
37 Reads
·
6 Citations
Numerous theoretical and experimental studies have proved the important role of radial electric field inhomogeneity, or shear, in LH-transition initiation, and established heating power threshold for transition, although some experiments provide the observation of LH-transition dependency on particle source. It is necessary to apply a concerted approach to describe LH-transition initiation possibility and dynamics, considering Er shear, particle source and turbulence properties as the main factors responsible for LH-transition initiation.
December 2019
·
12 Reads
Plasma Physics Reports
Citations (52)
... In the present experiments with co-NBI, we do not see the L-H transition if only the co-NBI pulse is not accompanied by a short pulse of gas puffing. The measurements of the BIV line also show no toroidal rotation [27]. It may be explained by a better confinement of fast ions in the co-NBI scenario, hence a lower fast ion loss current and toroidal torque. ...
- Citing Article
January 2022
Technical Physics Letters
... ICE was early observed from fusion-born ion populations in pure deuterium and DT plasmas in JET [1][2][3][4] and TFTR [5,6], and from neutral beam injected (NBI) ions in TFTR [7]. Since 2017, ICE has been detected and analysed from NBI and fusion-born ions in the KSTAR [8][9][10], DIII-D [11][12][13][14][15][16], ASDEX-Upgrade [17][18][19][20][21], NSTX-U [22,23], JT-60U [24][25][26], TUMAN-3M [27][28][29], EAST [30][31][32][33] and HL-2A [34,35] tokamaks, and the LHD heliotron-stellarator [36][37][38][39][40][41]. The magnetoacoustic cyclotron instability (MCI) has been identified as the excitation mechanism for ICE through analytical studies [6,7,42] and simulations [8-10, 12, 38, 39, 43-46]. ...
- Citing Article
November 2021
Technical Physics Letters
... For instance, the geodesic acoustic mode (GAM) and its various qualities were thoroughly investigated using DBS [23,24], and the results of these measurements helped researchers This system was previously used in TUMAN-3M to study a variety of phenomena. For instance, the geodesic acoustic mode (GAM) and its various qualities were thoroughly investigated using DBS [23,24], and the results of these measurements helped researchers to understand the physics of the transition to H-mode initiated by the developments of these modes [25][26][27]. However, this is the first series of experiments where the characteristics of the plasma with NBI were studied using DBS in TUMAN-3M. ...
- Citing Article
- Publisher preview available
November 2020
... For instance, the geodesic acoustic mode (GAM) and its various qualities were thoroughly investigated using DBS [23,24], and the results of these measurements helped researchers This system was previously used in TUMAN-3M to study a variety of phenomena. For instance, the geodesic acoustic mode (GAM) and its various qualities were thoroughly investigated using DBS [23,24], and the results of these measurements helped researchers to understand the physics of the transition to H-mode initiated by the developments of these modes [25][26][27]. However, this is the first series of experiments where the characteristics of the plasma with NBI were studied using DBS in TUMAN-3M. ...
- Citing Article
August 2019
Technical Physics Letters
... To support measurements of fast ion distributions provided by the NPAs, a neutron dump (ND) installed behind the LENPA analyzer is equipped with neutron and gamma spectrometers (see figure 4) [20,21]. The main task of the Gamma-Ray Spectrometer (GRS) is providing data on the energy distribution of alpha particles in the energy range 1.7-3.5 MeV obtained from measurements of 4.44 MeV line emission generated in the 9 Be(α, nγ) 12 C reaction. ...
- Citing Article
- Full-text available
May 2019
... ICE was early observed from fusion-born ion populations in pure deuterium and DT plasmas in JET [1][2][3][4] and TFTR [5,6], and from neutral beam injected (NBI) ions in TFTR [7]. Since 2017, ICE has been detected and analysed from NBI and fusion-born ions in the KSTAR [8][9][10], DIII-D [11][12][13][14][15][16], ASDEX-Upgrade [17][18][19][20][21], NSTX-U [22,23], JT-60U [24][25][26], TUMAN-3M [27][28][29], EAST [30][31][32][33] and HL-2A [34,35] tokamaks, and the LHD heliotron-stellarator [36][37][38][39][40][41]. The magnetoacoustic cyclotron instability (MCI) has been identified as the excitation mechanism for ICE through analytical studies [6,7,42] and simulations [8-10, 12, 38, 39, 43-46]. ...
- Citing Article
November 2018
Technical Physics Letters
... AWs are commonly observed in the presence of energetic ions in the MeV energy range (produced by neutral beam injection, ion cyclotron resonance heating, or even fusion-born alpha particles) which can satisfy the conditions of effective resonance and energy exchange with such waves [3]. However, modes with Alfvénic frequency scaling have also been detected in ohmic discharges (i.e. in the absence of fast particles) in numerous tokamak experiments, including JET [4], EAST [5], TFTR [6], FTU [7], TEXTOR [8], ASDEX Upgrade [9], TUNAM-3M [10], COMPASS [11], MAST [12], Globus-M2 [13] and SUNIST [14]. In most of the above-mentioned experiments (EAST, TFTR, TUMAN-3M, COMPASS, MAST, Globus-M2 and SUNIST), AWs were detected following relatively long-timescale MHD events in the plasma, such as sawteeth, internal reconnection events (IREs) and edge localized modes (ELMs). ...
- Citing Article
November 2018
Technical Physics Letters
... Duration of improved confinement state in the modeling is approximately 0.5 ms, while in experiment it is about 1.5 ms. Gyrokinetic simulation of this discharge with ELMFIRE code could provide the information about the origins of the discrepancy [46]. Turbulence parameters evolve during the pellet evaporation: deposition of cold particles from the pellet leads to significant collisionality increase in the evaporation region. ...
- Citing Article
May 2018
Plasma Physics and Controlled Fusion
... In the case of tokamaks, it has been demonstrated that fuelling is best achieved when injecting pellets from the high-field side (HFS) whereas, in the case of stellarators, it is still to be determined if HFS or low-field side (LFS) injections are more advantageous [3]. In addition, improved plasma performance, associated with pellet fuelling, has been reported for both device types [4][5][6][7]. Indeed, improved performance rather than fuelling is the principal interest of the work presented here. ...
- Citing Article
May 2018
... ICE was early observed from fusion-born ion populations in pure deuterium and DT plasmas in JET [1][2][3][4] and TFTR [5,6], and from neutral beam injected (NBI) ions in TFTR [7]. Since 2017, ICE has been detected and analysed from NBI and fusion-born ions in the KSTAR [8][9][10], DIII-D [11][12][13][14][15][16], ASDEX-Upgrade [17][18][19][20][21], NSTX-U [22,23], JT-60U [24][25][26], TUMAN-3M [27][28][29], EAST [30][31][32][33] and HL-2A [34,35] tokamaks, and the LHD heliotron-stellarator [36][37][38][39][40][41]. The magnetoacoustic cyclotron instability (MCI) has been identified as the excitation mechanism for ICE through analytical studies [6,7,42] and simulations [8-10, 12, 38, 39, 43-46]. ...
- Citing Article
April 2018