Y. Kazakov
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View article: Velocity-space tomography of MeV-range fast-ion distributions in JET using wave–particle interaction priors
Velocity-space tomography of MeV-range fast-ion distributions in JET using wave–particle interaction priors Open
The fast-ion distribution function in fusion plasmas can only be measured indirectly by solving an ill-posed inverse problem. The inversion being ill-posed necessitates regularisation of the problem to ensure that the reconstruction of the…
View article: Absolute measurement of the deuterium–tritium reaction gamma-ray emission in magnetic confinement fusion plasmas
Absolute measurement of the deuterium–tritium reaction gamma-ray emission in magnetic confinement fusion plasmas Open
The Joint European Torus performed its second deuterium–tritium (DT) campaign at the end of 2021. This unique opportunity was exploited to carry out the first absolute measurement in a magnetic confinement plasma of the total gamma-ray emi…
View article: Understanding turbulence suppression in JET D–T plasma with highly energetic fast ions via global gyrokinetic GENE simulations
Understanding turbulence suppression in JET D–T plasma with highly energetic fast ions via global gyrokinetic GENE simulations Open
This study focuses on understanding how turbulence is suppressed in particularly heated JET plasma discharges showing enhanced confinement, namely , which uses a nearly 50–50 deuterium–tritium mixture, showing signs of enhanced plasma c…
View article: Analysis of the linear and nonlinear stability of Alfven eigenmodes and fish-bones in JET DT discharges: mode identification and shear flows generation
Analysis of the linear and nonlinear stability of Alfven eigenmodes and fish-bones in JET DT discharges: mode identification and shear flows generation Open
The plasma in future nuclear fusion reactors will be heated by neutral beam injectors (NBIs) and high frequency electromagnetic waves as well as fusion born alpha particles. Energetic particles (EPs), with energies up to two orders of magn…
View article: Velocity-space tomography of an MeV fast-ion tail generated by three-ion scheme ICRF heating at JET
Velocity-space tomography of an MeV fast-ion tail generated by three-ion scheme ICRF heating at JET Open
Recently-developed methods are used successfully to reconstruct the two-dimensional velocity-space distribution of the energetic minority MeV ion tail created by heating in the ion cyclotron range of frequencies (ICRFs) in the D–D – 3…
View article: Fast-ion phase-space tomography with wave–particle interactions in the ion cyclotron frequency range as prior
Fast-ion phase-space tomography with wave–particle interactions in the ion cyclotron frequency range as prior Open
The fast-ion distribution function in fusion plasmas can be inferred by inverting Doppler-shifted measurements from fast-ion diagnostics. The full fast-ion distribution function can be parametrised by three constants of motion with the add…
View article: Measurement of Zero-Frequency Fluctuations Generated by Coupling between Alfvén Modes in the JET Tokamak
Measurement of Zero-Frequency Fluctuations Generated by Coupling between Alfvén Modes in the JET Tokamak Open
We report the first experimental detection of a zero-frequency fluctuation that is pumped by an Alfvén mode in a magnetically confined plasma. Core-localized Alfvén modes of frequency inside the toroidicity-induced gap (and its harmonics) …
View article: Overview of the third JET deuterium-tritium campaign
Overview of the third JET deuterium-tritium campaign Open
JET returned to deuterium-tritium operations in 2023 (DTE3 campaign), approximately two years after DTE2. DTE3 was designed as an extension of JET’s 2022-2023 deuterium campaigns, which focused on developing scenarios for ITER and DEMO, in…
View article: Ion cyclotron range of frequencies plasma production and heating in the large helical device
Ion cyclotron range of frequencies plasma production and heating in the large helical device Open
Plasma production in stellarators with ion cyclotron heating is complementary to the widely used electron cyclotron heating (ECRH). The prospective light ion minority scenario developed and tried on Uragan-2M and Large Helical Device (LHD)…
View article: Reconstruction of the fast-ion deuterium distribution in a tritium-rich plasma in the JET DTE2 campaign
Reconstruction of the fast-ion deuterium distribution in a tritium-rich plasma in the JET DTE2 campaign Open
An important step on the way to future fusion power plants was the 2021 deuterium–tritium experimental campaign (DTE2) at the Joint European Torus (JET), in which crucial DT physics was investigated. In this study, we have reconstructed th…
View article: Experimental and numerical investigation of the Doppler-shifted resonance condition for high frequency Alfvén eigenmodes on ASDEX Upgrade
Experimental and numerical investigation of the Doppler-shifted resonance condition for high frequency Alfvén eigenmodes on ASDEX Upgrade Open
The Doppler-shifted resonance condition for high frequency Alfvénic eigenmodes has been extensively studied on ASDEX Upgrade in the presence of one or a combination of two neutral beam injected (NBI) fast ion populations. In general, only …
View article: Overview of physics results from MAST upgrade towards core-pedestal-exhaust integration
Overview of physics results from MAST upgrade towards core-pedestal-exhaust integration Open
Recent results from MAST Upgrade are presented, emphasising understanding the capabilities of this new device and deepening understanding of key physics issues for the operation of ITER and the design of future fusion power plants. The imp…
View article: COSMONAUT: A COmpact spectrometer for measurements of neutrons at the ASDEX upgrade tokamak
COSMONAUT: A COmpact spectrometer for measurements of neutrons at the ASDEX upgrade tokamak Open
A COmpact Spectrometer for Measurements Of Neutrons at the ASDEX Upgrade Tokamak (COSMONAUT) has been developed for spectroscopy measurements of the 2.45 MeV neutron emission from deuterium plasmas at the ASDEX Upgrade. The instrument is b…
View article: Measurement of zero-frequency fluctuations generated by coupling between Alfven modes in the JET tokamak
Measurement of zero-frequency fluctuations generated by coupling between Alfven modes in the JET tokamak Open
We report the first experimental detection of a zero-frequency fluctuation that is pumped by an Alfvèn mode in a magnetically confined plasma. Core-localized bidirectional Alfvèn modes of frequency inside the toroidicity-induced gap (and i…
View article: ICRF production of plasma with hydrogen minority in Uragan-2M stellarator by two-strap antenna
ICRF production of plasma with hydrogen minority in Uragan-2M stellarator by two-strap antenna Open
The experiments on medium-size stellarator Uragan-2M (U-2M) in Kharkiv, Ukraine, are carried on in support of the Wendelstein 7-X (W7-X) experimental program. The scenario ion cyclotron frequency range (ICRF) plasma production at the hydro…
View article: Impact of interaction between RF waves and fast NBI ions on the fusion performance in JET DTE2 campaign
Impact of interaction between RF waves and fast NBI ions on the fusion performance in JET DTE2 campaign Open
This work presents a study of the interaction between radio frequency (RF) waves used for ion cyclotron resonance heating and the fast deuterium (D) and tritium (T) neutral Beam injected (NBI) ions in DT plasma. The focus is on the effects…
View article: Experiments in high-performance JET plasmas in preparation of second harmonic ICRF heating of tritium in ITER
Experiments in high-performance JET plasmas in preparation of second harmonic ICRF heating of tritium in ITER Open
The reference ion cyclotron resonance frequency (ICRF) heating schemes for ITER deuterium–tritium (D-T) plasmas at the full magnetic field of 5.3 T are second harmonic heating of T and 3 He minority heating. The wave-particle resonance loc…
View article: JET D-T scenario with optimized non-thermal fusion
JET D-T scenario with optimized non-thermal fusion Open
In JET deuterium-tritium (D-T) plasmas, the fusion power is produced through thermonuclear reactions and reactions between thermal ions and fast particles generated by neutral beam injection (NBI) heating or accelerated by electromagnetic …
View article: Stable Deuterium-Tritium burning plasmas with improved confinement in the presence of energetic-ion instabilities
Stable Deuterium-Tritium burning plasmas with improved confinement in the presence of energetic-ion instabilities Open
Providing stable and clean energy sources is a necessity for the increasing demands of humanity. Energy produced by fusion reactions, in particular in tokamaks, is a promising path towards that goal. However, there is little experience wit…
View article: ICRF Plasma Production with Hydrogen Minority Heating in Uragan-2M and Large Helical Device
ICRF Plasma Production with Hydrogen Minority Heating in Uragan-2M and Large Helical Device Open
This report compares results ion-cyclotron range of frequencies (ICRF) plasma production at hydrogen minority regime in Uragan-2M (U-2M) and Large Helical Device (LHD). The condition of the presence of the fundamental harmonic ion cyclotro…
View article: Analytical and MonteCarlo approaches to infer the total gamma ray emission from the JET tokamak
Analytical and MonteCarlo approaches to infer the total gamma ray emission from the JET tokamak Open
A single gamma-ray spectrometer installed at the end of a collimator can be used to infer the total emission from a tokamak plasma if the transport of gamma-rays from the plasma to the detector is known. In such analysis, the plasma emissi…
View article: Analysis of high frequency Alfvén eigenmodes observed in ASDEX Upgrade plasmas in the presence of RF-accelerated NBI ions
Analysis of high frequency Alfvén eigenmodes observed in ASDEX Upgrade plasmas in the presence of RF-accelerated NBI ions Open
High frequency Alfvén eigenmodes in the ion cyclotron frequency range are actively researched on the ASDEX Upgrade tokamak (AUG). The general properties of this particular mode type are: ( a ) the mode is beam-driven and, if excited, can p…
View article: ICRH operations and experiments during the JET-ILW tritium and DTE2 campaigns
ICRH operations and experiments during the JET-ILW tritium and DTE2 campaigns Open
2021 has culminated with the completion of the JET-ILW DTE2 experimental campaign. This contribution summarizes Ion Cyclotron Resonance Heating (ICRH) operations from system and physics point of view. Improvements to the (ICRH) system, to …
View article: Fusion product measurements by nuclear diagnostics in the Joint European Torus deuterium–tritium 2 campaign (invited)
Fusion product measurements by nuclear diagnostics in the Joint European Torus deuterium–tritium 2 campaign (invited) Open
A new deuterium–tritium experimental, DTE2, campaign has been conducted at the Joint European Torus (JET) between August 2021 and late December 2021. Motivated by significant enhancements in the past decade at JET, such as the ITER-like wa…
View article: ICRF Plasma Production with the W7-X Like Antenna in the Uragan-2M Stellarator
ICRF Plasma Production with the W7-X Like Antenna in the Uragan-2M Stellarator Open
The results of the plasma start-up with ICRH of U-2M RF discharges in H2+He mixture with newly implemented controlled gas H2 concentration are presented. The W7-X like ICRH antenna operated in monopole phasing with applied RF power of ∼ 10…
View article: Representation and modeling of charged particle distributions in tokamaks
Representation and modeling of charged particle distributions in tokamaks Open
Experimental diagnostics, analysis tools and simulations represent particle\ndistributions in various forms and coordinates. Algorithms to manage these data\nare needed on platforms like the ITER Integrated Modelling & Analysis Suite\n(IMA…
View article: Fast ion transport by sawtooth instability in the presence of ICRF–NBI synergy in JET plasmas
Fast ion transport by sawtooth instability in the presence of ICRF–NBI synergy in JET plasmas Open
JET experiments have shown that the three-ion scenarios using waves in the ion cyclotron range of frequencies (ICRF) is an efficient way to build fast ion population through beam ion acceleration by radio frequency (RF) waves. Here, such a…
View article: Retention of Fast Alpha Particles and Expulsion of Helium Ash by an Internal Disruption in a Tokamak Plasma
Retention of Fast Alpha Particles and Expulsion of Helium Ash by an Internal Disruption in a Tokamak Plasma Open
An internal disruption is simulated in a large tokamak plasma with monotonic safety factor profile close to unity. The domain and the time scale of the event are set to match observations. The simulation follows passive alpha particles wit…