A5004321314- Gyrotron and Vacuum Electronics Research
- Pulsed Power Technology Applications
- Laser Material Processing Techniques
- Particle accelerators and beam dynamics
- Plasma Diagnostics and Applications
- Laser-induced spectroscopy and plasma
- Plasma Applications and Diagnostics
- Electrohydrodynamics and Fluid Dynamics
- Laser-Ablation Synthesis of Nanoparticles
- Electrostatic Discharge in Electronics
- Microwave Engineering and Waveguides
- Laser-Matter Interactions and Applications
- Advanced Surface Polishing Techniques
- Diamond and Carbon-based Materials Research
Leibniz Institute of Surface Engineering
2020-2023
Leipzig University
2021-2023
Central Electronics Engineering Research Institute
2017-2020
Abstract A structurally simple dielectric barrier discharge based mercury-free plasma UV-light source has been developed for efficient water disinfection. The comprises of a arrangement between two co-axial quartz tubes with an optimized gas gap. outer electrode is aluminium baked foil tape arranged in helical form pitch, while the inner hollow metallic rod, hermetically sealed. Strong bands peaking at wavelengths 172 nm and 253 nm, along weak band wavelength 265 have simultaneously observed...
The experimental study of a tapered, multi-gap, multi-aperture pseudospark-sourced electron gun based X-band plasma assisted slow wave oscillator is presented. designed on the pseudospark discharge concept and has been used to generate high current density energy beam simultaneously. distribution apertures arranged such that field penetration potency inside backspace hollow-cathode different while passing through tapered gap region. This leads non-concurrent ignition all channels which is,...
Focusing of femtosecond laser pulses in gases can produce different gas breakdown phenomena depending on the focusing conditions: from simple optical like "sparks" to a nonlinear filamentation. The dynamics such plasmas after pulse exposure is dependent energy deposited by volume. Using time- and position-dependent model, we estimate volume show that this determines characteristics laser-induced plasma post-pulse regime. Experimentally find for focal lengths there exists threshold value...
In this article, a comparative experimental and simulations analysis has been carried out to understand the role of tapered gap region on current density energy pseudospark (PS)-based electron beam emission. These studies have performed for 5-gap 8-gap regions in multigap multiaperture-based PS source, keeping same fill factor, other geometrical parameters identical. The source operated self-breakdown mode. Around four-times increase observed case at fixed applied potential ranging between...
In this article, the design approach for a miniaturized high-current-density sheet electron beam (SEB) source has been reported. A study through simulation using COMSOL Multiphysics carried out to analyze role of geometrical parameters hollow cathode in SEB generation. These play very important defining discharge inside geometry and subsequent generation rectangular aperture. The diameter “D”, length “L”, aspect ratio defined by aperture size front region have optimized SEB. width defines It...
Abstract Recently, plasma produced by focusing femtosecond laser in gases has been introduced as an etching tool materials processing. Proper control of the this application necessitates apt understanding different morphological features plasma. In contribution we show that, air goes through several stages development–from ellipsoidal to spherical toroidal plasma, whereas argon, axial compression is observed. To explain dissimilarity, have quantified temperature emission spectroscopy (Planck...
The process requirements for ultra-precise machining of surfaces optical applications is still challenging laser ablation-based methods.The LIPE (laser-induced plasma etching) method combines the two complementary techniques and processing.Technologically important materials like SiO 2 , Ge, Si as well fiber-reinforced composites (SiC-SiC) have been successfully processed with LIPE, in particular Polyimide (Kapton@ HN (125 µm)) Polyethylenterephthalat.In present paper, etching polymer...
In this work, a microhollow cathode variant consisting of cylindrical structure and coaxial anode, with layer dielectric barrier on the inner wall cavity, has been investigated. This arrangement allows device to be operated at atmospheric pressure reaching electron densities up 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">18</sup> m xmlns:xlink="http://www.w3.org/1999/xlink">-3</sup> in cavity. The discharge initiates from narrow gap...