Effect of conducting containment on electromagnetic launcher efficiency

Ceylan, Doğa
Keysan, Ozan
Electromagnetic launcher, also called railgun, is a projectile accelerator which uses the electromagnetic force. Existence of solid metal containment around the rails of electromagnetic launchers, which increases the mechanical durability, affects the electromagnetic force on armature and rails. In this study, the effect of distance between non-laminated conducting containment and rails, and the effect of the lamination thickness on the efficiency of railgun are investigated. Also, the effect of magnetic and electrical material properties of the containment on the core loss is observed. Direction and magnitude of induced eddy current in the metal containment is analyzed by the aid of Finite Element Method (FEM) software COMSOL


Utilization and Optimization of Superconducting Coil Parameters in Electromagnetic Launcher Systems
Polat, Hakan; Ceylan, Doga; Keysan, Ozan (2019-06-01)
The utilization of external field windings in electromagnetic launchers provides an additional electromagnetic field between the rails of an electromagnetic launcher which increases the Lorentz force acting on the armature in the acceleration direction. However, additional magnetic field created by the conventional copper windings are very limited due to their low maximum current carrying capability. Therefore, using high temperature superconductors (HTS) with a current carrying capability up to 100 A/mm 2 ...
Kara, Dogacan; Donmezer, Nazli; Canan, Talha Furkan; ŞEN, ÖZLEM; ÖZBAY, Ekmel (2016-07-14)
Field plated GaN high electron mobility transistors (HEMTs) are widely preferred amongst other GaN HEMT devices because of their ability to regulate electric field at high power densities. When operated at high power densities, GaN HEMTs suffer significantly from the concentrated heating effects in a small region called hotspot located closer to the drain edge of the gate. Although; the stabilizing effect of field plate on the electrical field distribution in HEMTs is known by researchers, its effect on tem...
Ceylan, D.; Gudelek, M. U.; Keysan, Ozan (2017-06-22)
Barrel side and pulsed power supply module are two crucial parts of an electromagnetic launcher (EML), which affects the efficiency. One of the most important features in the barrel side is the shape of the armature. In this study, the shape of the armature is optimized by using independent variables to define the exact geometry of the armature. The main goal is to maximize the muzzle kinetic energy of the projectile. Armature geometry is divided into pieces which are used in the optimization algorithm as i...
Influence of nanoparticle shape on colloidal plasmonic interface properties
Sarıgül, Elif; Bek, Alpan; Department of Physics (2014)
Nanoparticles bearing free charges, interact very strongly with incoming electromagnetic radiation at certain frequencies called the plasmon resonance frequencies, depending on the size, shape and material properties of the particle and the medium. In order to enhance the light scattering by a two dimensional network of such plasmonic nanoparticles several strategies can be followed. In this thesis, it was pursued the fabrication and characterization of the nanoparticle decorated surfaces by colloidal solut...
Effect of particle polydispersity on particle concentration measurement by using laser Doppler anemometry
Ayranci, Isil; Pinguet, Guillaume; Escudie, Dany; Selçuk, Nevin; Vaillon, Rodolphe; Andre, Frederic (2007-08-01)
Measurement of particle concentration by laser Doppler anemometry (LDA) is studied on a vertical air jet seeded by a powder disperser with controlled particle and air flow rates. Particle arrival rate is utilized to retrieve particle number densities from conventional LDA operation. The effect of polydisperse nature of the particles is assessed. Comparisons between measured and estimated particle number densities suggest that only a certain portion of the particle population with a particle size to fringe s...
Citation Formats
D. Ceylan and O. Keysan, “Effect of conducting containment on electromagnetic launcher efficiency,” 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/43214.