2024 Random walk of cathode arc spots in vacuum

Random walk of cathode arc spots in vacuum

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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 …

The influence of gap distance on the random walk of cathode spot …

Webb27 maj 2005 · Random walk models of cathode spot motion are well established: they go asymptotically to Brownian motion for infinitesimal step width. The power spectrum of … WebbThe observed vacuum arc cathode spot rotation has important implications for propulsion since the cathode spot rotation leads to a uniform cathode erosion, which is critical for … first presbyterian church ellsworth ks

Random walk of cathode arc spots in vacuum - NASA/ADS

Webb14 mars 1995 · Anders A, Anders S, Hantzsche E, Jüttner B and Ziegenhagen G 1993a Optical investigation of arc cathode spots in vacuum Proc. XXIth Int. Conf. on Phenomena in Ionized Gases, Bochum vol I, pp 3-4. Google Scholar Anders A, Anders S, Jüttner B, Bötticher W, Lück H and Schröder G 1992a Pulsed dye laser diagnostics of vacuum arc … 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 … 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. first presbyterian church elizabeth nj

The evolution of ion charge states in cathodic vacuum arc …

Structure and dynamics of high-current arc cathode spots in …

WebbVacuum arc appears in interrupters, thrusters, ion source, coating and so on. If the current is not very large, cathode is the main plasma source. Thousands of cathode spots make up the cathode phenomenon. Research of cathode spot crater is one of the foundations for vacuum arc field. 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 ... first presbyterian church edwardsville ilWebb17 maj 2024 · Abstract: A model of cathode spots in high-current vacuum arcs is developed, with account of the plasma cloud left over from a previously existing spot, all … first presbyterian church eau claire wi

"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 … " - Random walk of cathode arc spots in vacuum

Random walk of cathode arc spots in vacuum

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 …

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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 mars 1995 · High-speed emission pictures of arc cathode spots in vacuum have been obtained in a spectrally narrowed range. It has been found that the total radiation was …

WebbA 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. 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 …

Webb28 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 … Webb21 jan. 1997 · Arc cathode spots in vacuum with Ti- and Cu-cathodes have been studied by using the high-speed framing camera IMACON 468 in the time range down to 10 ns. The …

Webb15 nov. 2000 · In this paper, a two-dimensional statistical model for a single cathode spot of vacuum arc with copper cathode has been established to simulate its random walk …

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. … first presbyterian church elizabethton tn first presbyterian church elkin ncWebb21 aug. 1998 · Abstract:With a combination of fast framing and streak channels, arc spots on a copper cathode are imaged by glass and UV-optics with /spl mu/m-resolution. At currents of about 70 A and sufficiently long after ignition (3-100 /spl mu/s), the spots reveal an inner fragment structure with sizes 5 /spl mu/m. first presbyterian church eufaula alWebbThe retrograde motion of arc cathode spots in vacuum - NASA/ADS Experiments are reported on the retrograde arc spot motion on copper and tantalum cathodes in vacuum in the presence of a magnetic field. The spots are imaged with time and space resolutions of <100 ns and <10 µm, respectively. first presbyterian church emporium paWebb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 … first presbyterian church eutaw alWebbThe 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 … first presbyterian church erie paWebb17 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, … first presbyterian church evanston