16 papers · ranked by Valyu relevance
Y. Patil, S. K. Karkari
radiofrequency (RF) and direct current (DC) sources. While RF systems such as inductively coupled plasmas (ICP) [1], helicon discharges [2], and electron cyclotron resonance (ECR) plasmas [3] are widely studied for their ability to deliver high-density, uniform plasmas, DC discharges remain foundational due to their…
D. Bhattacharjee, S. Adhikari, N. Buzarbaruah, S. R. Mohanty
The kinetic analyses are quite important when it comes to understand the particle behavior in any device as they start to deviate from continuum nature. In the present study, kinetic simulations are performed using Particle-in-Cell (PIC) method to analyze the behavior of ions inside a cylindrical Inertial Electrostatic…
Jan-Philipp Wulfkühler, Hai-Dang Nguyen, Leo Peiffer, Martin Tajmar
Inertial electrostatic confinement fusion (IECF) devices often use two concentric spherical electrodes to converge ions in a plasma electrostatically. Using a highly transparent inner cathode, the ions can move through the cathode and collide at the center to undergo fusion reactions. This is a simple method to build a…
J. von der Linden, S. Nißl, A. Deller, M. Singer + 5 more
Prerequisites for the goal of studying long-lived, magnetically confined, electron-positron pair plasmas in the laboratory include the injection of both species into the trap, long trapping times, and suitable diagnostic methods. Here we report recent progress on these tasks achieved in a simple dipole trap based on a…
J. N. Hedditch, Richard Bowden-Reid, Joe Khachan
Theory for a gridded inertial electrostatic confinement (IEC) fusion system is presented that shows a net energy gain is possible if the grid is magnetically shielded from ion impact. A simplified grid geometry is studied, consisting of two negatively-biased coaxial current-carrying rings, oriented such that their…
Yuichi Kurashima, Taisei Motomura, Shinya Yanagimachi, Takashi Matsumae + 3 more
'Takashi Matsumae' 'Mitsuhiro Watanabe' 'Hideki Takagi' 'Alberto Corigliano'] In this study, we design a highly efficient plasma source using a magnetic mirror trap with two opposing permanent magnets for a miniature high-efficiency ion pump. First, we simulated the distribution of the magnetic field line formed by the…
Babacar Diop, Jean Bonnet, Thomas Schmid, Ajmal Mohamed
We present a new compact electron gun based on the secondary emission through ionic bombardment principle. The driving parameters to develop such a gun are to obtain a quite small electron gun for an in-flight instrument performing Electron Beam Fluorescence measurements (EBF) on board of a reentry vehicle in the upper…
Shaozheng Ji, Luca Piazza, Gaolong Cao, Sang Tae Park + 3 more
'Bryan W. Reed' 'Daniel J. Masiel' 'Jonas Weissenrieder'] Efforts to understand matter at ever-increasing spatial and temporal resolutions have led to the development of instruments such as the ultrafast transmission electron microscope (UEM) that can capture transient processes with combined nanometer and picosecond…
Preethi Ravikumar, Matheus A. S. Pessôa, Sajad Shiekh, Zezhou Liu + 2 more
Extracellular vesicles (EVs) are attractive candidates for minimally invasive disease monitoring. EV diagnostic signals often reside in low-abundant subpopulations, motivating single-vesicle measurements that can report distributions rather than ensemble averages. In practice, such assays rely on transient migration of…
Francis Pagaud, V. Dolique, N. Claire, Nicolas Plihon
Thermionic emission from a polycrystalline tungsten emissive cathode immersed in a magnetized plasma column is investigated experimentally and numerically. Electrical and optical measurements of the cathode temperature show a highly inhomogeneous cathode temperature profile due to plasma-cathode interactions. The…
Xuesong Yuan, Weiwei Zhu, Yu Zhang, Ningsheng Xu + 6 more
'Jianqiang Wu' 'Yan Shen' 'Jun Chen' 'Juncong She' 'Shaozhi Deng'] Gigahertz to terahertz radiation sources based on cold-cathode vacuum electron technology are pursued, because its unique characteristics of instant switch-on and power saving are important to military and space applications. Gigahertz gyrotron was…
Anna Sitek, Kristinn Torfason, Andrei Manolescu, Á. Valfells
We use computational simulations to study the electron emission and propagation in planar vacuum diodes. We show how space-charge affects thermionic emission from cathodes with two different values of work function that form a checkerboard pattern of finite extent on the cathode surface. We confirm that, for…
Jiupeng Li, Yu Tu, Dewei Ma, Yun Yang + 1 more
Field emission (FE) cold-cathodes have some important characteristics, including instant turn-on, room temperature operation, miniaturization, low power consumption, and nonlinearity. As emitters, Carbon nanotubes (CNTs) exhibit a high field enhancement factor, low turn-on voltage, high current density, high thermal…
Authors not listed
Polymer blends often suffer from macroscopic phase separation due to incompatibility, with conventional compatibilization techniques relying on kinetically trapped, inhomogeneous structures. Here we show that confining prototypical immiscible polymers, polystyrene (PS) and polymethyl methacrylate (PMMA), within the…
Authors not listed
Power and energy density represent a trade-off in design of lithium-ion batteries. This is because for high energy density thick electrodes are required, and for high power density thin electrodes are required. A strategy to break this trade-off is to develop electrodes with regions of low tortuosity (e.g. cracks or…
Authors not listed
In-liquid plasma electrolysis refers to the ignition of a plasma in a thin vapor layer surrounding a solid electrode immersed in a liquid electrolyte and its associated processes. Over the last century, this phenomenon has been described under various names and is frequently denoted as Contact Glow Discharge…