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Henan Tongwei Medical Equipment Co., LtdCall us : +86 − −19139704654 // Email us : [email protected]
Henan Tongwei Medical Equipment Co., LtdCall us : +86 − −19139704654 // Email us : [email protected]
This book is devoted to a thorough investigation of the physics and applications of the vacuum arc – a highly-ionized metallic plasma source used in a number of applications – with emphasis on cathode spot phenomena and plasma formation the effects of magnetic fields on cathode spot behavior and electrical characteristics of arcs and
Mar 25 2011In present investigation the cathode spots present the characteristics of division This similar result is also reported by Yang [10] on a nanocrystalline CuCr alloy but he thought that the division of cathode spots is caused by the internal electric field
Reviews of vacuum arc plasma discharges have been given by a number of authors −19] The [17 vacuum arc is a high-current discharge between two electrodes in vacuum At the cathode the current is concentrated at a small number of tiny discrete sites called cathode spots The formation of cathode
Aug 19 2020The direction of the cathode spot group's motion was opposite to the Lorentz force direction In this constriction and motion stage the corresponding arc voltage was at a low value of less than 100 V with some large fluctuations After 0 7 ms the cathode spot
work we focus on the systematic experimental investigation of pseudospark discharge properties for multi-gap discharge configurations and the highly time-resolved characteristics of pseudospark produced electron beams which are the challenging subject in pseudospark discharge and transient hollow cathode discharge due to the high
Comparative characteristics of the cathode processes in the discharge with electrodes of pure metal and of CuCr composition are presented The effect of the gap electrode shape and other geometric factors on the cathode spots dynamics is investigated
focused on investigation of the carbon nanostructure cathode operation in terms of X-ray source applications Two main process characteristics will be measured using the presented unit: VI-characteristics and electron beam dynamics in the system The first characteristic is traditionally measured by the volt-meters and ampere-
The investigated parameters in the setup are: cathode VI-characteristics and anode focal spot dimensions The measurement of the anode X-ray focal spot will be processed with pinhole technique triode broad side is tilted 10 degrees with a goniometer to decrease the broad size of the focal spot The triode unit is mounted inside the vacuum
Crookes tubes are cold cathode tubes meaning that they do not have a heated filament in them that releases electrons as the later electronic vacuum tubes usually do Instead electrons are generated by the ionization of the residual air by a high DC voltage (from a few kilovolts to about 100 kilovolts) applied between the cathode and anode electrodes in the tube usually by an induction coil
This paper presents the results of an investigation of thermal and physical properties of the hollow cathode arc discharge (HCAD) with respect to its application for welding processes in vacuum The following main parameters of the arc discharge were studied: the external voltage-current (V-I) characteristics plasma parameters inside the cathode cavity and in the arc external column and the
vacuum arc discharge have been investigated intensely in recent decades [1] But the extreme values of cathode spot parameters [4-8] lead to difficulties in researching of the processes transition of cathode material from solid state to density plasma inside the cathode spots At the same time very important
work we focus on the systematic experimental investigation of pseudospark discharge properties for multi-gap discharge configurations and the highly time-resolved characteristics of pseudospark produced electron beams which are the challenging subject in pseudospark discharge and transient hollow cathode discharge due to the high
Apr 27 2016In this paper cathode spot plasma jet (CSPJ) rotation and cathode spots behavior subjected to two kinds of large diameter axial magnetic field (AMF) electrode (cup-shaped and coil-shaped) are studied and analyzed based on experiments The influence of gap distances on the CSPJ rotational behavior is analyzed Experimental results show that CSPJ rotational phenomena
The interaction between the interelectrode plasma and macroparticles (droplets) produced by a multitude of cathode spots in a vacuum arc between Cu electrodes is analyzed using previous experimental measurements of the macroparticle size distribution and erosion rate and a flowing plasma model The effect of the plasma on the macroparticles is considered by treating the macroparticles as
Authors: Arunrungrusmi S Chaokamnerd W Tanitteerapan T Mungkung N Yuji T Abstract: The purpose of this research was to analyze and compare the instability of a contact surface between Copper and Nickel an alloy cathode in vacuum the different ratio of Copper and Copper were conducted at 1% 2% and 4% by using the cathode spot model
May 23 2012Effect of vacuum backpressure on discharge characteristics of hollow cathode 1 October 2019 | Plasma Science and Technology Vol 21 No 12 Recent progress in research and development of hollow cathodes for electric propulsion
May 23 2012Effect of vacuum backpressure on discharge characteristics of hollow cathode 1 October 2019 | Plasma Science and Technology Vol 21 No 12 Recent progress in research and development of hollow cathodes for electric propulsion
Abstract: Cathode spot formation in laser-induced breakdown in vacuum was investigated by laser absorption photography with high spatial (0 5 /spl mu/m) and temporal (100 ps) resolution The discharge was initiated between Cu electrodes with a cathode-anode distance of 15-250 /spl mu/m The duration of pulsed discharges was 750 ns and dc discharges some milliseconds the current was below 10 A
using arc in low vacuum as a metal surface cleaning innovation [1-2] The method depends on characteristics of the "cathode spot" which is a small bright region that appears and moves on the cathode surface Although the cathode spot is a well-known phenomenon its behavior is mysterious
Abstract: Cathode spot formation in laser-induced breakdown in vacuum was investigated by laser absorption photography with high spatial (0 5 /spl mu/m) and temporal (100 ps) resolution The discharge was initiated between Cu electrodes with a cathode-anode distance of 15-250 /spl mu/m The duration of pulsed discharges was 750 ns and dc discharges some milliseconds the current was below 10 A
Three vacuum facilities were used in this investigation: 1) Port 2 of Tank 11 at GRC 2) Vacuum Facility 52 at GRC and the Cathode Test Facility (CTF) at the Plasmadynamics and Electric Propulsion Laboratory (PEPL) The CTF is depicted schematically in Figure 4 All of these facilities were cryopumped and Port 2 and CTF have base
It is established experimentally that the burning of a low-current (several and tens of amperes) pulsed (microseconds) vacuum discharge is accompanied by the formation of plasma microbunches around some of the droplets leaving the cathode spot The parameters of these bunches (electron concentration n e∼1026 m−3 and equilibrium temperature T e∼1 eV) are close to the parameters of cathode
Fig 2 A Single Cathode Spot Fig 3 Cathode spot model 2 Analytical Model[4] In order to confirm the effect of low thermal conductivity the cathode spot model is used with various values of thermal conductivity as shown in Fig 4 The cathode spot model assumes that the collisionless sheath and collisional plasma are
Aug 01 2018With the continuous improvement of current levels in power systems the demands on the breaking capacity requirements of vacuum circuit breakers are getting higher and higher The breaking capacity of vacuum breakers is determined by cathode spots which provide electrons and metal vapor to maintain the arc In this paper experiments were carried out on two kinds of transverse magnetic
Abstract: Cathode material and surface conditions control parameters of the cathode spot (CS) and thus have an influence on properties of the vacuum arc discharge as a whole A great number of various alloys and compositions have been developed to provide for improvement of operating characteristics of electrodes and arc properties due to selection of CS parameters
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