Random walk of cathode arc spots in vacuum

Author: tswb

August undefined, 2024

Webb15 nov. 2000 · The cathode spot movement of a vacuum arc with Al, Cd, Mo and Cu cathodes was investigated. Provided external disturbances are absent the cathode spot … Webb14 sep. 1983 · Abstract The theoretical basis of the random walk movement of cathode arc spots is reconsidered, and the probable causes of some discrepancies in measured spot movement parameters and in their interpretation are discussed. Export citation and abstract BibTeX RIS Previous article in issue Next article in issue References

The fractal nature of vacuum arc cathode spots IEEE Journals ...

WebbThe spots move in a random manner in elementary steps of a crater radius with time constants of the order of 10 −8 s. The main reason for the movement is the formation of micropoints at crater boundaries. Droplets and contaminations induce jumps of more than a … Webb25 maj 2024 · Abstract: A detailed numerical model of individual cathode spots in high-current vacuum arcs is developed. The model takes into account two kinds of plasmas in the vicinity of the spot: an “external” plasma (e.g., a plasma generated for arc triggering, a bulk background plasma, or a plasma cloud left over from a previous spot in the … dw melodrama\u0027s

The evolution of ion charge states in cathodic vacuum arc …

Webb1 juli 2013 · The cathode spot movements produce an arc erosion pattern composed of a large number of craters, whose sizes varied from about 1 μm to 5 μm in diameter. The … Webbof cathodic arcs in vacuum for various cathode arcs [4]. The arcs were generated in a coaxial plasma source and fluctuations of voltage during arc were recorded using a … Webb21 sep. 2007 · Arc cathode spots in vacuum with Cu cathodes have been registered by combining framing and streak channels of a fast image converter camera equipped with … dw maple\u0027s

Space-Resolved Modeling of Stationary Spots on Copper Vacuum …

Cathode spot velocity of vacuum arcs - ResearchGate

Webb21 juni 2013 · A variety of approaches have been developed in the literature towards modelling of cathode spots in vacuum arcs. These include space-resolved descriptions based on numerical solution of 1D or 2D partial differential equations, both … WebbSimulating Propagation of Spots over Cathodes of High-Power Vacuum Circuit Breakers Abstract: Cathode attachment of high-current vacuum arcs, e.g., those in high-power … dwmapi 32bit pinvokeWebb28 maj 2012 · Cathodic vacuum arc discharges are characterized by the formation of very small, non-stationary cathode spots—locations of extreme current and power densities—while the voltage between anode and cathode is … refleksi projek

"Webb7 jan. 1997 · Experiments are reported on the number and displacement velocity of arc spots on CuCr and Cu cathodes in the current range 40 - 1500 A. The spot number was … " - Random walk of cathode arc spots in vacuum

Random walk of cathode arc spots in vacuum

Cathode Spot - an overview ScienceDirect Topics

Webba low frequency part related to a random cathode spot walk. Cathode arc spot was intensively studied by different authors [1, 2, 3]. The mechanisms of these processes are still not clear. Previously, A. Andres et al. studied the noise of the burning voltage of cathodic arcs in vacuum for various cathode arcs [4]. The arcs were generated in a ... Webb11 juni 2013 · Abstract: A self-consistent space-resolved numerical model of cathode spots in vacuum arcs is realized on the computational platform COMSOL Multiphysics. …

Did you know?

WebbArc cathode spots in vacuum with Cu cathodes have been registered by combining framing and streak channels of a fast image converter camera equipped with high-magnification optics. In a special version UV radiation could be used for imaging. Webbadshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A

Webb17 okt. 2005 · Cathode spot phenomena show many features of fractals, for example self-similar patterns in the emitted light and arc erosion traces. Although there have been hints on the fractal nature of cathode spots in the literature, the fractal approach to spot interpretation is underutilized. In this work, a brief review of spot properties is given, … Webb22 juli 2024 · An equation governing the evolution of the surface density of the spots or, equivalently, the distribution of macroscopic (averaged over individual spots) current …

Webbtransport enhances the diffusion (random-walk) transport by the factor of 1 + δ. III. ANALYSIS OF EXPERIMENTS A. Description of cathode spot motion during sinusoidal current wave in the presence of external magnetic fields As the first example, let us consider the distribution of cathode spots in a vacuum arc that was burning between WebbA: anode; C: cathode. nous spot on arc-cleaned surfaces in vacuum, exploiting the effects of spot dynamics to enhance the spatial resolu- tion of the optical measurements. II. EXPERIMENT The arc spots were ignited at the top of …

WebbThe cathode spot (CS), as the source of arc plasma, plays very important role in maintaining the burning of vacuum arc, particularly, in relatively low current with inactive …

Webb哪里可以找行业研究报告？三个皮匠报告网的最新栏目每日会更新大量报告，包括行业研究报告、市场调研报告、行业分析报告、外文报告、会议报告、招股书、白皮书、世界500强企业分析报告以及券商报告等内容的更新，通过最新栏目，大家可以快速找到自己想要的内 … dw makedonskiWebbA first experimental validation of the evaporation-determined arc-cathode coupling (EDACC) model is performed by comparing the experimental and simulated current in the peak current phase of a pulsed gas metal arc welding process. For this, the EDACC model was extended to limit the cathode surface temperature to a realistic value of <2400 K. refleksi di blok m plazaWebbThe cathode spot, which is essential for the very existence of a vacuum arc, is the least understood of all vacuum-arc phenomena. Clearly, it is the source of electron emission … dw lisp\u0027s