Ivan Romadanov
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View article: Planar laser-induced fluorescence system for spatiotemporal ion velocity distribution function measurements
Planar laser-induced fluorescence system for spatiotemporal ion velocity distribution function measurements Open
In this work, we present a planar laser-induced fluorescence (PLIF) system for measuring two-dimensional (2D), spatiotemporally resolved ion velocity distribution functions (IVDFs). A continuous-wave tunable diode laser produces a laser sh…
View article: Structured light approaches in laser-based plasma diagnostics
Structured light approaches in laser-based plasma diagnostics Open
There is a growing demand for plasma diagnostics suitable for industrial plasma reactors employed in semiconductor nanofabrication, especially relevant to microelectronics and quantum information systems. Such reactors typically have limit…
View article: Planar Laser-Induced Fluorescence system for Space and Phase-resolved Ion Velocity Distribution Function Measurements
Planar Laser-Induced Fluorescence system for Space and Phase-resolved Ion Velocity Distribution Function Measurements Open
In this work, we present a planar laser-induced fluorescence (PLIF) system for two-dimensional (2D) spatial and phase-resolved ion velocity distribution function (IVDF) measurements. A continuous-wave tunable diode laser produces a laser s…
View article: Mode transitions and spoke structures in E×B Penning discharge
Mode transitions and spoke structures in E×B Penning discharge Open
Two-dimensional particle-in-cell simulations in the (radial-azimuthal) plane perpendicular to the axial direction of a cylindrical E×B Penning discharge are presented. The low-pressure discharge is self-consistently supported by plasma ion…
View article: Report on laser-induced fluorescence transitions relevant for the microelectronics industry and sustainability applications
Report on laser-induced fluorescence transitions relevant for the microelectronics industry and sustainability applications Open
A wide variety of feed gases are used to generate low-temperature plasmas for the microelectronics and sustainability applications. These plasmas often have a complex combination of reactive and nonreactive species which may have spatial a…
View article: Anticathode effect on electron kinetics in electron beam generated E × B plasma
Anticathode effect on electron kinetics in electron beam generated E × B plasma Open
Electron beam (e-beam) generated plasmas with applied crossed electric and magnetic ( ) fields are promising for low damage processing of materials with applications to microelectronics and quantum information systems. In cylindrical …
View article: Wavelength modulation laser-induced fluorescence for plasma characterization
Wavelength modulation laser-induced fluorescence for plasma characterization Open
Laser-Induced Fluorescence (LIF) spectroscopy is an essential tool for probing ion and atom velocity distribution functions (VDFs) in complex plasmas. VDFs carry information about the kinetic properties of species that is critical for plas…
View article: Anticathode effect on electron kinetics in electron beam generated $\mathbf{E} \times \mathbf{B}$ plasma
Anticathode effect on electron kinetics in electron beam generated $\mathbf{E} \times \mathbf{B}$ plasma Open
Electron beam (e-beam) generated plasmas with applied crossed electric and magnetic $\left(\mathbf{E} \times \mathbf{B}\right)$ fields are promising for low damage processing of materials with applications to microelectronics and quantum i…
View article: Report on laser-induced fluorescence transitions relevant for the microelectronics industry and sustainability applications
Report on laser-induced fluorescence transitions relevant for the microelectronics industry and sustainability applications Open
A wide variety of feed gases are used to generate low-temperature plasmas for the microelectronics and the sustainability applications. These plasmas often have a complex combination of reactive and non-reactive species which may have spat…
View article: Wavelength modulation laser-induced fluorescence for plasma characterization
Wavelength modulation laser-induced fluorescence for plasma characterization Open
Laser-Induced Fluorescence (LIF) spectroscopy is an essential tool for probing ion and atom velocity distribution functions (VDFs) in complex plasmas. VDFs carry information about kinetic properties of the species critical for plasma chara…
View article: Production of warm ions in electron beam generated E × B plasma
Production of warm ions in electron beam generated E × B plasma Open
Several recent experiments have demonstrated low-damage processing of 2D materials, such as graphene and single crystal diamond, using electron beam (e-beam) generated plasmas with applied crossed electric and magnetic (E × B) fields. The …
View article: A confocal laser-induced fluorescence diagnostic with an annular laser beam
A confocal laser-induced fluorescence diagnostic with an annular laser beam Open
In this work, we report an annular beam confocal laser-induced fluorescence (LIF) configuration, which allows for high spatial resolution measurements of plasma properties in plasma setups and sources with limited optical access. The propo…
View article: Laser-Induced Fluorescence of Xe I and Xe II in Ambipolar Plasma Flow
Laser-Induced Fluorescence of Xe I and Xe II in Ambipolar Plasma Flow Open
Laser-induced fluorescence diagnostic technique is applied here to probe xenon neutrals and single-charged ions in an ambipolar plasma source. A single tunable diode laser is employed for pumping both following transitions: 6s 2 [1/2] 1 0 …
View article: Current flow instability and nonlinear structures in dissipative two-fluid plasmas
Current flow instability and nonlinear structures in dissipative two-fluid plasmas Open
The current flow in two-fluid plasma is inherently unstable if plasma components (e.g., electrons and ions) are in different collisionality regimes. A typical example is a partially magnetized E×B plasma discharge supported by the energy r…
View article: Formation of a high energy density field reversed configuration for compact toroid applications
Formation of a high energy density field reversed configuration for compact toroid applications Open
Formation of a compact toroid (CT) or field reversed configuration (FRC) with a maximum input of energy and the capture of the magnetic field into plasma is an important scientific and technical challenge. The new method of CT formation is…
View article: Fluid theory and simulations of instabilities, turbulent transport and coherent structures in partially-magnetized plasmas of $\mathbf{E}\times \mathbf{B}$ discharges
Fluid theory and simulations of instabilities, turbulent transport and coherent structures in partially-magnetized plasmas of $\mathbf{E}\times \mathbf{B}$ discharges Open
Partially-magnetized plasmas with magnetized electrons and non-magnetized ions are common in Hall thrusters for electric propulsion and magnetron material processing devices. These plasmas are usually in strongly non-equilibrium state due …
View article: Dispersion Relation Tool for generalized lower-hybrid mode with, density gradient, equilibrium ExB drift, collisions and finite electron Larmor radius
Dispersion Relation Tool for generalized lower-hybrid mode with, density gradient, equilibrium ExB drift, collisions and finite electron Larmor radius Open
MATLAB solver has been developed for studies of local instabilities in partially magnetized plasmas typical for ExB discharge plasmas. Examples for the Simon-Hoh, lower-hybrid and ion-sound instabilities in Penning discharge. The detailed …
View article: Generalized lower-hybrid mode with, density gradient, equilibrium ExB drift, collisions and finite electron Larmor radius: Numerical studies with MATLAB solver
Generalized lower-hybrid mode with, density gradient, equilibrium ExB drift, collisions and finite electron Larmor radius: Numerical studies with MATLAB solver Open
MATLAB solver for general dispersion relation has been developed to study local instabilities in partially magnetized plasmas typical for ExB discharges. Several examples of the Simon-Hoh, lower-hybrid and ion-sound instabilities with the …
View article: Generalized lower-hybrid mode with, density gradient, equilibrium ExB\n drift, collisions and finite electron Larmor radius: Numerical studies with\n MATLAB solver
Generalized lower-hybrid mode with, density gradient, equilibrium ExB\n drift, collisions and finite electron Larmor radius: Numerical studies with\n MATLAB solver Open
MATLAB solver for general dispersion relation has been developed to study\nlocal instabilities in partially magnetized plasmas typical for ExB discharges.\nSeveral examples of the Simon-Hoh, lower-hybrid and ion-sound instabilities\nwith t…