20th International Symposium on Discharges and Electrical Insulation in Vacuum
Cơ quản chủ quản: N/A
Các bài báo tiêu biểu
Calculation of electric field in vacuum circuit breaker using optimized and traditional CSM
- Trang 552-555
In this paper, a combined method of traditional and optimized charge simulation method (CSM) based on the genetic algorithms (GA) is presented for calculating electric field. Based on the well studied and analyzed traditional CSM, the optimized charges locations and quantities have been realized using GA as the optimization method. The feasibility and practicability of the combined method are veri......
#Circuit breakers #Optimization methods #Finite difference methods #Boundary conditions #Dielectrics and electrical insulation #Voltage #Home appliances #Electrodes #Conductors #Electric potential
HV dielectric strength of shielding electrodes in vacuum circuit-breakers
- Trang 119-122
The subject of this paper is the HV dielectric strength of shielding and field-grading electrodes in vacuum circuit-breakers. It describes the effects exerted by various geometrical parameters, the surface area and the material of the shielding on the breakdown behavior of shielding. The experiments were performed with a shielding electrodes model and were carried out under lightning impulse volta......
#Dielectric breakdown #Electrodes #Circuits #Voltage #Vacuum systems #Solid modeling #Testing #Elementary particle vacuum #Vacuum technology #Dielectric materials
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
Computer simulation of influence of the ionization processes on dynamics of formation of electronic beams in plasma sources of the charged particles
- Trang 404-406
The elevated working pressure is an advantage of plasma emitters of electrons. At such a range of working pressure of plasma sources of electrons to neglect shock ionization of molecules of residual gas by beam electrons, and, hence, ion space charge in a gap of acceleration is impossible. Other distinctive feature of plasma sources of electrons are that the geometry and position of emitting surfa......
#Computer simulation #Ionization #Particle beams #Plasma sources #Plasma accelerators #Electron beams #Acceleration #Plasma properties #Plasma simulation #Electron emission
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
Luminescence spectra emitted at surface flashovers of aluminas in vacuum
- Trang 431-434
The components of desorbed gases from alumina at surface flashover were analyzed by using a monochromator. As a result, we found spectra of hydrogen, oxygen and the material of electrodes (stainless steel Fe, Ni, Cr) and component of alumina (Al) at surface flashover. The intensity of spectra of hydrogen decreased with the accumulation of the number of surface flashover.
#Flashover #Electrodes #Optical surface waves #Needles #Gas insulation #Gases #Luminescence #Voltage #Surface discharges #Stimulated emission
Enhanced emission mode of a ferroelectric plasma cathode
- Trang 319-322
An enhanced emission mode has been observed in a ferroelectric plasma cathode based on BaTiO/sub 3/ ceramics. The enhanced emission is achieved by the generation of a dense plasma (10/sup 13/-10/sup 14/ cm/sup -3/). The mechanism of the plasma formation was studied. Generation of an electron beam with current amplitude up to 2.5 kA is demonstrated.
#Ferroelectric materials #Cathodes #Electrodes #Electron beams #Plasma density #Surface discharges #Acceleration #Voltage #Current density #Plasma applications
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
Investigation of H/sup -/ ions formation in the reflective discharge with metal-hydride cathode
- Trang 614-617
The paper presents the results of experimental investigations of elementary processes in cathode layer of H/sup -/ ions plasma source based on Penning discharge with metal hydride cathode. The getter alloy Zr/sub 55/V/sub 40/Fe/sub 5/+3%B/sub 2/O/sub 3/ hydride was used as the cathode material. It is shown that the use of such hydride forming compositions leads to enhancing of H/sup -/ ions genera......
#Cathodes #Hydrogen #Electrodes #Thermal decomposition #Anodes #Electron beams #Fault location #Gettering #Inorganic materials #Ion sources
Sự phóng điện bề mặt trong bộ cách điện tại giao diện chân không/dầu Dịch bởi AI
- Trang 219-222
Dữ liệu thực nghiệm về sự phóng điện bề mặt trong polymethyl methacrylate (PMMA) tại giao diện dầu/chân không bằng các xung đầu vào tăng dần được trình bày. Bộ cách điện có hình nón cụt với chiều dài thay đổi từ 1 mm đến 3 mm và góc từ 70 độ đến 70 độ. Với độ dốc dV/dt của xung đầu vào, trường phóng điện thay đổi từ 30 kV/mm đến 10 kV/mm trong trường hợp phóng điện bề mặt chân không/chất rắn và từ......
#Sự phóng điện bề mặt #Dầu #Sạc bề mặt #Vật liệu cách điện và cách điện điện áp #Điện áp đổ vỡ #Electron #Đổ vỡ chân không #Mô hình rắn #Phát xạ thermionic #Phonon