A5049517703- Advanced Materials Characterization Techniques
- Surface and Thin Film Phenomena
- nanoparticles nucleation surface interactions
- Particle Accelerators and Free-Electron Lasers
- Force Microscopy Techniques and Applications
- Ion-surface interactions and analysis
- Gyrotron and Vacuum Electronics Research
- Laser-Plasma Interactions and Diagnostics
- Advanced Surface Polishing Techniques
- Semiconductor materials and devices
- Photonic and Optical Devices
- High-pressure geophysics and materials
- Electronic and Structural Properties of Oxides
- Photodynamic Therapy Research Studies
- Optical Coatings and Gratings
- Nuclear Materials and Properties
- Advanced Frequency and Time Standards
- Fusion materials and technologies
- Pulsed Power Technology Applications
- Electron and X-Ray Spectroscopy Techniques
- Advanced Chemical Physics Studies
- Theoretical and Computational Physics
- Fluid Dynamics and Thin Films
- Diamond and Carbon-based Materials Research
- Advanced X-ray Imaging Techniques
University of Wrocław
2005-2022
National Tsing Hua University
2022
University of Washington
2022
This document provides detailed information on the status of Advanced and Novel Accelerators techniques describes steps that need to be envisaged for their implementation in future accelerators, particular high energy physics applications. It complements overview prepared update European Strategy particle physics, a description field. The scientific priorities community are described each technique acceleration able achieve accelerating gradient GeV~range or above. ALEGRO working group...
Equilibrium crystal shape of oxygen-covered tungsten is followed as a function temperature using field ion microscopy. In the vicinity (111) region, at $970\pm70$ K, system undergoes phase transition from polyhedral form (sharp edges and sharp vertex) to rounded edges, vertex).
The possibility of exciting guided-mode resonances in dielectric grating laser accelerator structures is discussed. Finite-element method calculations the accelerating electromagnetic field are presented both for periodic boundary conditions (infinite periodicity) and finite gratings.
A conventional free-electron laser is useful but large, driven by a beam with many relativistic electrons. Although, recently, keV electron beams have been used to excite broadband radiation from material chips, there remains quest for chip-size capable of emitting coherent radiation. Unfortunately, those emitters microscopes or dielectric accelerators usually deliver small current discrete moving electrons separated distance few tens microns. To envisage as powerful research tool, we study...
One important factor which determines efficiency of loading cold atoms into an optical dipole trap from a magneto-optical is the distance between centers. By studying this for various depths $(2--110\phantom{\rule{0.3em}{0ex}}\mathrm{mK})$ we find that optimum loading, longitudinal displacements up to $15\phantom{\rule{0.3em}{0ex}}\mathrm{mm}$ are necessary. An explanation observation presented and compared with other work simple analytical formula derived
The question of suitability transfer matrix description electrons traversing grating-type dielectric laser acceleration (DLA) structures is addressed. It shown that although considerations lead to interesting insights, the basic properties DLA cells cannot be described by a matrix. A more general notion function simple and useful tool for formulating problems particle dynamics in DLA. As an example, focusing structure proposed which works simultaneously all electron phases.
The intensity of Smith-Purcell radiation from metallic and dielectric gratings (silicon, silica) is compared in a frequency-domain simulation. numerical model discussed verified with the Frank-Tamm formula for Cherenkov radiation. For 30 keV electrons, rectangular are less efficient than their counterpart, by an order magnitude silicon, two orders silica. all studied, oscillates grating tooth height due to electromagnetic resonances grating. 3D 2D models compared.
Abstract A thick palladium layer (∼5 nm) is deposited onto a curved tantalum surface. The system submitted to several annealing cycles. Structural changes within 0–5 nm below the surface are observed using Field Ion Microscopy. At 800 K, an atomic intermixing of adsorbate and substrate observed. Pd atoms detected first five layers Ta substrate. 1100 multilayer alloy formed at surface, oriented epitaxially with respect Ta{100} planes.
We consider radiation generated by an electron travelling parallel to a planar rectangular silicon grating: Smith-Purcell the vacuum side, internal into dielectric, and Cherenkov dielectric. Internal dominates over other two mechanisms in range where conventional is forbidden. This observation may lead improved design of contactless particle beam monitors.
We propose a setup for measuring visible and near-visible internal Smith-Purcell radiation Cherenkov Diffraction Radiation, based on silica silicon, perform quantitative numerical analysis of its efficiency. calculate the total radiated energy per electron spectral distribution different orders, taking into account material dispersion absorption. For an optimized grating 200 micrometer length, reaches 2~eV 2 MeV electrons. Above threshold, in most cases diffraction is several times higher...
We perform detailed numerical simulations of field ion microscopy images faceted crystals and compare them with experimental observations. In contrast to the case a smooth surface, for topography we find extreme deformations image. Local magnification is highly inhomogeneous may vary by an order magnitude: from 0.64 6.7. Moreover, anisotropy at point located on facet edge reach factor 10.
The notions of acceleration gradient and deflection are generalized to phasor quantities (complex-valued functions) in the context dielectric laser (DLA). It is shown that electromagnetic forces imparted on a near-resonant particle traversing unit cell grating-type DLA can be conveniently described by gradients. A simple formulation Panofsky–Wenzel theorem terms gradients given. all transfer properties derived from single, complex-valued function, gradient.
This paper demonstrates and summarises both temperature oxygen exposure limitations of faceting in the system O/W[111], including facets evolution with-oxygen leading to globally or steplike faceted tip, for intermediate O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> exposures 0.3 L-3 L (31 at elevated annealing 1700 K). The results presented here were obtained using FIM technique. Results show that after temperatures lower than 800...