A5090950158- Magnetic confinement fusion research
- Advanced Optical Imaging Technologies
- Fusion materials and technologies
- Photonic and Optical Devices
- Ionosphere and magnetosphere dynamics
- Nuclear Physics and Applications
- Medical Imaging Techniques and Applications
- Internet Traffic Analysis and Secure E-voting
- Superconducting Materials and Applications
- Network Security and Intrusion Detection
- Seismic Imaging and Inversion Techniques
- Nonlinear Optical Materials Studies
- Photorefractive and Nonlinear Optics
- Photonic Crystals and Applications
- Laser-Plasma Interactions and Diagnostics
- Network Packet Processing and Optimization
- Geophysical Methods and Applications
- Particle accelerators and beam dynamics
- Chaos-based Image/Signal Encryption
- Advanced Radiotherapy Techniques
- Particle Detector Development and Performance
- Advanced Malware Detection Techniques
- Random lasers and scattering media
- Augmented Reality Applications
- Nanofabrication and Lithography Techniques
Safina (Czechia)
2024
Czech Technical University in Prague
2009-2023
Czech Academy of Sciences, Institute of Plasma Physics
2019-2023
Institute of Nuclear Physics, Polish Academy of Sciences
2021
Masaryk University
2016
Université de franche-comté
2009
Franche-Comté Électronique Mécanique Thermique et Optique - Sciences et Technologies
2009
Centre National de la Recherche Scientifique
2009
Network monitoring is a difficult and demanding task that vital part of network administrator's job. administrators are constantly striving to maintain smooth operation their networks. If were be down even for small period time, productivity within company would decline, in the case public service departments ability provide essential services compromised. There several approaches security monitoring. This paper provides readers with critical review prominent implementations current approaches.
COMPASS Upgrade is a new medium size, high magnetic field tokamak (R = 0.9 m, Bt 5 T, Ip 2 MA) currently under design in the Czech Republic. It will provide unique capabilities for addressing some of key challenges plasma exhaust physics, advanced confinement modes and configurations as well testing facing materials liquid metal divertor concepts. This paper contains an overview preliminary engineering main systems (vacuum vessel, central solenoid poloidal coils, toroidal support structure,...
Abstract To understand mechanical behavior of metastable metal-matrix composites, Cu@Ag core–shell powders two compositions, 51:49 and 80:20 (Cu:Ag in wt%), were compacted by spark plasma sintering. The microstructures these composites are characterized single spherical particulates pure Cu the matrix Ag former case while aggregates latter one. plastic deformation showed enhancement ultimate tensile strength compared to both component metals a factor ca. 3. It is shown that part can be...
Retrieving spatial distribution of plasma emissivity from line integrated measurements on tokamaks presents a challenging task due to ill-posedness the tomography problem and limited number lines sight. Modern methods therefore implement a-priori information as well constraints, in particular some form penalisation complexity. In this contribution, current under development (Tikhonov regularisation, Bayesian neural networks) are briefly explained taking into account their potential for...
Abstract Plasma disruptions present a significant challenge to the viability of fusion energy production in tokamak reactors. Among disruption mitigation techniques, shattered pellet injection (SPI) has emerged as promising approach. The results presented this paper show novel findings impact nitrogen and neon seeding on sequence following SPI Joint European Torus (JET). This study exposes an order magnitude reduction pre-thermal quench duration for highly seeded plasmas pure deuterium SPI,...
Abstract Future large tokamaks will operate at high plasma currents and stored energies. To ensure machine protection in case of a sudden loss confinement (major disruption), fraction the magnetic thermal energy must be radiated to reduce loads. The disruption mitigation system for ITER is based on massive material injection form shattered pellet (SPI).
To support ITER, versatile SPI was installed tokamak ASDEX Upgrade (AUG). AUG features three independent generation cells guide...
Anonymous communication networks, like Tor, partially protect the confidentiality of user traffic by encrypting all communications within overlay network. However, Tor is not only used for good; a great deal in networks fact port scans, hacking attempts, exfiltration stolen data and other forms online criminality. The anonymity network often misused hackers criminals order to remotely control hacked computers. In this paper we present our methodology detecting any connection or from Our...
Network monitoring and measurement have become more more important in a modern complicated network. In the past, administrators might only monitor few network devices or less than hundred computers. The bandwidth may be just 10 or 100 Mbps; however, now administrators to deal with not only higher speed wired (more than 10 Gbps ATM (Asynchronous Transfer Mode) network) but also wireless networks. are constantly striving to maintain smooth operation of their networks. monitoring is set...
Internet users have been attacked by widespread email viruses earlier, but now scenario has changed. Now attackers are no more interested to just attract media attention infecting a large number of computers on the network; in fact, their interest shifted compromising and controlling the infected for their personal profits. This new attack trend brings concept botnets over global network of computers. With high reported infection rates, vast range illegal activities powerful comebacks,...
Abstract Electron cyclotron wall condition (ECWC) discharges are characterised in ASDEX Upgrade with full tungsten plasma facing components and X2 polarised waves launched from the equatorial ports, relevant to ECWC conditions ITER Pre-Fusion Power Operation phase 1. The characterisation of deuterium plasmas is based on experimental inputs such as electron density measurements, in-vessel pressure poloidal field maps obtained measured coil currents, well advanced tomographic methods camera...
In this paper, different techniques of three-dimensional holographic imaging with respect to particular applications are discussed. The realization based on image synthesis at the hologram plane and observer's eye pupil presented compared classical holography approach. Each technique is accompanied an example hologram, that was created using some in-house developed devices.
Abstract A python package, called Tomotok, focused on performing tomographic inversion of tokamak plasma radiation is being developed at the Institute Plasma Physics Czech Academy Sciences. It aims providing multiple algorithms with an user friendly interface. In order to enable and ease different devices worldwide, it planned publish this software as open source in near future. contribution, package structure allowing easy implementation various diagnostic geometries described overview...
In this paper we present a software for the design and visualization of holographic elements containing full scale visual effects. It enables to simulate an observation under general conditions including different light sources with various spectral coherence properties geometries reconstruction. Furthermore, recent technologies offer interesting possibilities 3D such as techniques based on shutter or polarization glasses, anaglyphs, etc. The presented is compatible mentioned application...
Direct laser beam writing techniques represent an interesting alternative to focused electron and ion approaches for the fabrication of photonic micro-structures. Although resolution writers is strongly limited by Rayleigh diffraction limit, it not always necessary create features significantly smaller than recording wavelength. In such cases, a exposure can be used, with all its advantages. this paper direct technique presented one; which improves performance commonly used introducing large...
The JET tokamak is equipped with extensive diagnostic systems for tomography, including bolometers and soft X-ray (SXR) detectors. tomographic reconstructions presented in this contribution were obtained using an algorithm based on Tikhonov regularisation Minimum Fisher information. A new method subsequent interpretative analysis of the will be introduced. It a comparison radiated power from different regions reconstruction, that can defined by rectangle or flux surface. was also used...
Future large tokamaks will operate at high plasma currents and stored energies. To ensure machine protection in case of a sudden loss confinement (major disruption), fraction the magnetic thermal energy must be radiated to reduce loads. The disruption mitigation system for ITER is based on massive material injection form shattered pellet (SPI). support ITER, versatile SPI was installed tokamak ASDEX Upgrade (AUG). AUG features three independent generation cells guide tubes, each equipped...