20th International Symposium on Discharges and Electrical Insulation in Vacuum
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Các bài báo tiêu biểu
Source of metal ions with a variable velocity
- Trang 674-677
Results of the time-of-flight measurements of the cathode plasma jet velocity in a low voltage vacuum spark are presented. It is found that the mean velocity of plasma jet is variable at a wide range of values. When the discharge current is enhanced from 0.6 kA up to 11 kA, the velocity of plasma jet at a distance of 35 cm from the copper cathode is risen linear from 2-10/sup 6/ cm/s up to 7-10/su......
#Cathodes #Plasma measurements #Capacitors #Velocity measurement #Plasma sources #Sparks #Vacuum arcs #Current measurement #Anodes #Delay
Process of ion-beam surface layer formation
- Trang 254-256
In the paper some regularities of metal surface ion-beam modification are studied theoretically. The model of ion-beam layer formation was developed on the basis of assumption about diffusion of radiation-induced defects from the surface layer that has some volume-averaged defect concentration.. A dependence of this volume-averaged defect concentration from ion flow parameters and treated material......
#Stress #Atomic layer deposition #Surface treatment #Spontaneous emission #Temperature dependence #Robots #Distribution functions #Ion implantation #Composite materials #Chemicals
Evolution of macroparticle temperature in nonequilibrium vacuum arc plasma
- Trang 103-106
The theoretical research of the energy exchange process between metal macroparticle and nonequilibrium vacuum arc plasma is carried out. Researched range of plasma parameters was n=(10/sup 15-/10/sup 19/) cm/sup -3/ and T/sub e/=(1-5) eV, the model macroparticles had radius R=(1-10) /spl mu/m and velocities V=(1-100) m/s. In the theoretical model the processes of electronic emission and atom evapo......
#Plasma temperature #Vacuum arcs #Plasma materials processing #Energy exchange #Elementary particle vacuum #Atomic measurements #Temperature distribution #Thermionic emission #Electronics cooling #Aerospace materials
Proceedings 20th ISDEIV. 20th International Symposium on Discharges and Electrical Insulation in Vacuum (Cat. No. 02CH37331)
- 2002
Presents the front cover of the proceedings record.
Critical separation and dielectric recovery of phasing vacuum switches when synchronized breaking short-circuit current
- Trang 599-601
The phasing switch is one of the intelligent techniques for vacuum switches, that means their interrupters closing at the voltage zero point and opening at the current zero point of AC system. The electronic driver system based on permanent magnetic actuators ensures the switch keeps synchronism with the AC voltage or current. A fast permanent magnet actuator designed for phasing vacuum switch was......
#Dielectrics #Switches #Magnetic switching #Intelligent actuators #Vacuum systems #Vacuum technology #Interrupters #Zero voltage switching #Driver circuits #Magnetic separation
Vacuum-arc plasma source with extended cylindrical cathode
- Trang 618-621
The experimental study of vacuum-arc plasma source with extended cylindrical cathode is carried out. The plasma source is intended for the protective coating deposition on articles having the form of closed containers. The plasma source cathode is fabricated as a cylinder with diameter 60 mm and length 750 mm. Aluminum is used as cathode material. Inside the cathode there is the cylindrical space ......
#Plasma sources #Cathodes #Coatings #Containers #Surface discharges #Aluminum #Coils #Steel #Arc discharges #Protection
Diagnostics of laser-induced spark discharges in air and vacuum
- Trang 564-567
In the authors' work, they present the results of their studies of self-channeling processes generated by interaction of an intense laser pulse (10/sup 15/ W/cm/sup 2/) with metallic and double-layer targets both in gas atmosphere and in vacuum. They report about measurements of intense X-ray radiation, the evolution of the plasma density in laser-produced plasmas by means of pulsed interferometry......
#Sparks #Optical pulse generation #X-ray lasers #Plasma measurements #Plasma density #Gas lasers #Pulse measurements #Plasma x-ray sources #Radiation detectors #X-ray detection
Cathode spot stochastic model
- Trang 607-609
A cathode spot periodic regeneration model was developed. The model can be useful to explain the arc discharge with current which is close to threshold values. The spot is considered as an emission center group. The spot generation and vanishing process is supposed as stochastic events. It is permitted to theoretically obtain: (1) arc number distribution (for arc life is greater than definite time......
#Cathodes #Stochastic processes #Arc discharges #Electronic mail #Chemicals #Voltage #Dielectrics and electrical insulation
High-current vacuum arc appearance in nonhomogeneous axial magnetic field
- Trang 380-383
The distribution of the spots over the cathode of high-current vacuum arc stabilized by axial magnetic field (AMF) has been investigated. AMF configuration has been varied from conventional "bell-shaped" to "magnetic barrier", where substantial AMF is created in the electrode edge virtually vanishing in the center. Complex effect of the AMF configuration on the behavior of cathode spots has been f......
#Vacuum arcs #Magnetic fields #Cathodes #Voltage #Electrodes #Current density #Anodes #Current distribution #Circuit breakers #Current supplies
Breaking performance of a capacitive-graded series design of two 24-kV vacuum circuit breakers
- Trang 360-363
This contribution deals with the breaking capability of a series design consisting of two 24-kV vacuum circuit breakers (VCB) with grading capacitors. In previous publications it was shown that the breaking capability of the series arrangement is higher compared to the double of a single tube. In addition to these results it is shown that in some cases grading capacitors can increase the breaking ......
#Circuit breakers #Voltage #Circuit testing #Capacitors #Vacuum systems #Transient analysis #Electromagnetic measurements #Vacuum technology #Vacuum arcs #Actuators