20th International Symposium on Discharges and Electrical Insulation in Vacuum
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Các bài báo tiêu biểu
Design and research on novel permanent magnetic actuator in low voltage and high current vacuum circuit breaker
- Trang 471-474
A novel permanent magnetic spring actuator of a low voltage high current vacuum
circuit breaker (VCB) is presented. The breaking property requirement is
satisfied, the current of the control circuitry is reduced and more
rationalization of production in practice is verified. Furthermore, magnetic
field distributions of permanent magnetic actuators under different operational
conditions are obtaine...
#Actuators #Low voltage #Springs #Coils #Permanent magnets #Magnetic flux #Circuit breakers #Magnetic circuits #Educational institutions #Magnetic properties
Analysis of insulator surface charging due to charge injection and secondary electron emission in vacuum
- Trang 622-625
During the developing process of flashover across an insulator in vacuum, the
insulator surface is usually charged. It is of great importance to analyze the
charging phenomena for better understanding the flashover characteristics in
vacuum. It is considered that there are two kinds of mechanisms closely related
to the surface charging phenomena of insulating materials, i.e., the classical
seconda...
#Electron emission #Surface charging #Dielectrics and electrical insulation #Flashover #Kinetic theory #Electrodes #Acceleration #Cathodes #Surface discharges #Mirrors
Effect of mechanical polish of electrode on several breakdown characteristics of vacuum gap
- Trang 427-430
For the purpose of controlling conductor surface roughness, relationships
between breakdown voltage of vacuum gaps and electrode surface roughness were
discussed The roughness of mechanically polished Cu and CuCr electrodes were
measured by a roughness meter. Experimental formula between breakdown voltage
and surface roughness were obtained for plate-to-plate gaps of both Cu and CuCr
electrodes. I...
#Vacuum breakdown #Electrodes #Rough surfaces #Surface roughness #Surface discharges #Surface treatment #Voltage control #Conductors #Mechanical variables measurement #Cathodes
Experimental analysis of ion parameters during the forced vacuum arc interruption
- Trang 415-418
The paper presents experimental measuring results of the ion decay time during
the post-arc phase after a forced interruption of diffuse vacuum arc. Arc
current of amplitudes 400 A and 600 A was switched-off using counter-pulse
current with falling rates from 2 A//spl mu/s u to 67 A//spl mu/s in a
laboratory test circuit. The used voltage, current and contact parameters were
representative for a l...
#Vacuum arcs #Circuit testing #Switches #Current measurement #Force measurement #Phase measurement #Time measurement #Switching circuits #Laboratories #Voltage
Surface treatment of electrodes by intense flows of charged particles as the method for improvement of vacuum insulation
- Trang 147-153
The paper presents the results of investigations of effect of surface treatment
of electrodes with pulsed intensive electron and ion flows on electrical
strength of vacuum insulation. Such a treatment has been shown to allow one to
decrease the prebreakdown currents and to increase the breakdown electric
fields. The mechanisms of this effect are analyzed in the paper.
#Surface treatment #Electrodes #Dielectrics and electrical insulation #Vacuum systems #Fault location #Gases #Cathodes #Anodes #Pulsed power supplies #Electrons
Surface charging by UV irradiation at the alumina RF window
- Trang 331-334
Alumina RF windows are used at high-power RF sources, such as klystrons. The
breakdown of RF windows takes place due to multipactor and flashover events on
the alumina surface. Both multipactor and surface flashover are considered to be
related to the primary electron emission sites, such as the peripheral region of
the alumina (the triple junction) and defects on the surface. Photoelectrons
induc...
#Surface charging #Radio frequency #Ceramics #Optical surface waves #Electron emission #Klystrons #Flashover #Coatings #Electric breakdown #Resonance
Generation and basic characteristics of a radially convergent beam fusion
- Trang 295-298
Experimental results for a cylindrical glow discharge for a portable neutron
source are presented. Basic characteristics, including emission intensity of the
hydrogen line, breakdown voltage, operating voltage versus discharge current and
floating potential profiles, were measured for a hydrogen discharge. Using
deuterium gas, a steady-state neutron production rate of 10/sup 5/ s/sup -1/ was
obser...
#Character generation #Fusion power generation #Neutrons #Hydrogen #Fault location #Current measurement #Glow discharges #Breakdown voltage #Deuterium #Steady-state
The nonstationary model for formation of the anode spot
- Trang 174-177
Physical and mathematical models are suggested to describe anode heating and
formation of the anode spot. At increasing current of the vacuum discharge there
occurs a crisis in the cathode ion flow leading to a specific (critical) current
value at which it is impossible for the ions to reach the anode. It is known
that in this case a negative space charge layer with a positive anode voltage
drop c...
#Anodes #Equations #Cathodes #Magnetic fields #Vacuum arcs #Plasma temperature #Mathematical model #Space charge #Electrons #Voltage
Arc voltage analysis for vacuum state estimation in vacuum interrupters
- Trang 443-446
In this paper the arc voltage of a vacuum interrupter, switching a 10 A DC
current, is evaluated. Voltage peaks are counted during 6 ms and represented in
histograms. These histograms are unambiguously discriminative for pressures
above 3*10/sup -2/ Pa. Beyond this pressure a sharp change in the performance of
the arc voltage is visible.
#Vacuum arcs #State estimation #Interrupters #Circuit testing #Vacuum systems #Histograms #Voltage measurement #Cathodes #Regions #Atmospheric measurements
Simulation of ion focusing by a Morozov's plasma lens in a magnetic field formed by counter ring currents
- Trang 182-185
The plasma lens in which the magnetic surfaces are equipotentials of an
electrical field is considered. The results of simulation of high-density,
large-aperture ion beam focusing are given in view of their longitudinal,
radial, and azimuthal motion. Geometrical and moment aberrations were taken into
account. Optimization of lens fields was realized; discrete distribution of the
lens electrical po...
#Plasma simulation #Lenses #Magnetic fields #Counting circuits #Surface topography #Coils #Electrodes #Surface discharges #Electric potential #Plasma density