A5026363562- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Advanced X-ray Imaging Techniques
- Superconducting Materials and Applications
- Terahertz technology and applications
- Magnetic confinement fusion research
- Laser-Plasma Interactions and Diagnostics
- Advanced Electron Microscopy Techniques and Applications
- Laser-Matter Interactions and Applications
- Metamaterials and Metasurfaces Applications
- Laser Design and Applications
- Radio Frequency Integrated Circuit Design
- Photocathodes and Microchannel Plates
- Energy Harvesting in Wireless Networks
- Plasma Diagnostics and Applications
- Plasmonic and Surface Plasmon Research
- Photonic Crystals and Applications
- Laser Material Processing Techniques
- Advanced Chemical Physics Studies
- Orbital Angular Momentum in Optics
- Advanced Electrical Measurement Techniques
- Advanced Fiber Laser Technologies
- Spacecraft and Cryogenic Technologies
- Microwave Engineering and Waveguides
RIKEN
2025
SPring-8
2024
Uppsala University
2015-2024
Paul Scherrer Institute
2020
Kharkiv Institute of Physics and Technology
2017
National Academy of Sciences of Ukraine
2004-2012
V. N. Karazin Kharkiv National University
2003-2012
O.Ya. Usikov Institute for Radiophysics and Electronics
2007-2011
National Academy of Sciences
2006
Terahertz (THz) light has proven to be a fine tool probe and control quasi-particles collective excitations in solids, drive phase transitions associated changes material properties, study rotations vibrations molecular systems. In contrast visible light, which usually carries excessive photon energy for condensed matter systems, THz allows direct coupling low-energy (meV scale) of interest. The development sources strong-field few-cycle pulses the 2000s opened door controlled manipulation...
Abstract CompactLight is a Design Study funded by the European Union under Horizon 2020 research and innovation funding programme, with Grant Agreement No. 777431. was conducted an International Collaboration of 23 international laboratories academic institutions, three private companies, five third parties. The project, which started in January 2018 duration 48 months, aimed to design innovative, compact, cost-effective hard X-ray FEL facility complemented soft source pave road for future...
When charged particles interact with laser fields, they are usually thought to be pushed out from the regions of higher intensity via mechanism known as ponderomotive force (PMF). In contrast existing theories, we show that there exist several regimes in which drawn into strongly focused fields. We derive a simple, covariant, and relativistically correct expression for holds arbitrary strength field focusing all particle velocities. predict three new, best our knowledge, physical effects:...
Strong-field few-cycle terahertz (THz) pulses are an invaluable tool for engineering highly nonequilibrium states of matter. A scheme is proposed to generate quasi-half-cycle GV/m-scale THz with a multikilohertz repetition rate. It makes use coherent spontaneous emission from prebunched electron beam traversing optimally tapered undulator. The the further development slippage control in free-electron lasers [T. Tanaka, Phys. Rev. Lett. 114, 044801 (2015)]. An explicit condition spectral...
Abstract Resonant optical antennas supporting plasmon polaritons (SPPs)—collective excitations of electrons coupled to electromagnetic fields in a medium—are relevant sensing, photovoltaics, and light‐emitting devices, among others. Due the SPP dispersion, conventional antenna fixed geometry, exhibiting narrow resonance, cannot simultaneously operate two different spectral bands. In contrast, here it is demonstrated that metallic disks, separated by nanometric spacer, hybridized antibonding...
We present radio frequency (RF) and thermal characterization of a compact 12-way power combiner designed for operation at 352 MHz level 100 kW with 5% duty factor. The is based on reentrant cavity 12 input doorknob couplers one output coupler that integrated the post forms type geometry. introduce convenient design formulas allow easy identification suitable parameter space, which then refined numerical simulations. Low-power RF measurements prototype show 0.2% insertion loss relative rms...
The interaction of waveguide modes and consequences on laser operation are studied numerically in a THz free electron (FEL) driven by short bunches. considered FEL cavity configuration is represented parallel-plate extending over the complete distance between cylindrical mirrors with energy out-coupling through rectangular slit one mirrors. We describe multimode desynchronization dynamics predict strong enhancement power at special configurations, when degenerate. Furthermore, we that...
The FREIA laboratory is a Facility for REsearch Instrumentation and Accelerator Development at Uppsala University, Sweden, constructed recently to develop test accelerator components. Initially it will the RF system spoke cavities of ESS linac prototype nominal power. For this purpose we installed helium liquefaction plant soon recieve versatile horizontal cryostat two 352 MHz power stations, one based on tetrodes other solid state technology. Beyond these developments house neutron...
We study the operation regime of a hybrid planar free-electron maser (FEM) amplifier near magnetoresonant value uniform longitudinal (guide) magnetic field. Using analytical expressions for individual test electron trajectories and normal frequencies their three-dimensional oscillations in magnetostatic field FEM, an condition chaotization motion is established shown to be given by Chirikov resonance-overlap criterion applied undulator cyclotron with respect coupling induced It also...
In this paper the design of free-electron laser (FEL) in SXL (Soft X-ray Laser) project at MAX IV Laboratory is presented. The target performance parameters originate a science case put forward by Swedish users and FEL foreseen to be driven existing 3 GeV linac. planned realized different stages focus on Phase 1, where basic operation mode for will SASE (self-amplified spontaneous emission), with an emphasis short pulses. Simulation results two linac bunches (high low charge) pulse duration...
The H₂020 CompactLight Project (www. CompactLight.eu) aims at designing the next generation of compact X-rays Free-Electron Lasers, relying on very high gradient accelerating structures (X-band, 12 GHz), most advanced concepts for bright electron photo injectors, and innovative short-period undulators. Compared to existing facilities, proposed facility will benefit from a lower beam energy, due enhanced undulators performance, be significantly more compact, with smaller footprint, as...
Starting from the rigorous excitation equation, propagation of waves through a 2D waveguide with periodically corrugated finite-length insert is examined in detail. The corrugation profile chosen to obey property that its amplitude small as compared width, whereas sharpness asperities arbitrarily large. With aid method mode separation, which was developed earlier for inhomogeneous-in-bulk systems [Waves Random Media \textbf{10}, 395 (2000)], segment shown serve effective scattering barrier...
CompactLight (XLS) is an International Collaboration of 24 partners and 5 third parties, funded by the European Union through Horizon 2020 Research Innovation Programme. The main goal project, which started in January 2018 with a duration 36 months, design hard X-ray FEL facility beyond today’s state art, using latest concepts for bright electron photo-injectors, high-gradient accelerating structures, innovative short-period undulators. specifications parameters future are driven demands...
2D materials immersed into a non-uniform, profiled magnetic field can focus THz light. This opens the door to novel magnetically-tunable lenses for ultrafast applications.
We propose a compact multiport two-stage combiner capable of handling peak power up to 10 MW at the UHF band and suitable for particle accelerator applications. The detailed electromagnetic thermal simulations operating ESS specifications 400 kW 352 MHz are presented. At first stage, is combined 100 level by means non-resonant 12-way radial combiner, which assumed be fed 8 solid-state amplifiers. second waveguide with T-shape couplers separated half-wavelength fundamental mode used in order...
The CompactLight European consortium is designing a state-of-the-art X-ray free-electron laser driven by radiofrequency X-band technology. Rooted in experimental data on photo-injector performance the recent literature, this study estimates analytically and numerically of delivery system for bunch charges range 75–300 pC. Space-charge forces injector, linac transverse wakefield, coherent synchrotron radiation compressors are all taken into account. confirms efficient lasing soft X-rays...
We propose a novel method for high-precision determination of quality factor Q <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> superconducting radio-frequency cavity as function the strength field excited in cavity, so-called Q-slope. Usually, parameters are measured only at resonance different strengths, but such single data point measurement given results 10%-15% uncertainty . In contrast, we that improves accuracy by an order...
We propose a novel gridless continuous-wave radiofrequency (rf) thermionic gun capable of generating nC ns electron bunches with rms normalized slice emittance close to the thermal level 0.3 mm mrad. In order gate emission, an externally heated cathode is installed into stripline-loop conductor. Two high-voltage pulses propagating towards each other in overlap region and create quasielectrostatic field gating emission. The repetition rate variable can reach up one MHz modern solid-state...