scholarly journals Space charge dynamics in high intensity rings

1999 ◽  
Vol 2 (11) ◽  
Author(s):  
J. A. Holmes ◽  
V. V. Danilov ◽  
J. D. Galambos ◽  
D. Jeon ◽  
D. K. Olsen
Keyword(s):  
Space Charge ◽  
High Intensity ◽  
Charge Dynamics

Terahertz Polarization and Space Charge Dynamics in Semiconductor Nanoparticles

2021 ◽  
Author(s):  
Zhijing Hu ◽  
Zi Wang ◽  
Yanlin Li ◽  
Tao Shen ◽  
Ming Yan ◽  
...  
Keyword(s):  
Space Charge ◽  
Semiconductor Nanoparticles ◽  
Charge Dynamics

scholarly journals Evaluation of Electric Field and Space Charge Dynamics in Dielectric under DC Voltage with Superimposed Switching Impulse

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1836 ◽  
Author(s):  
Ik-Soo Kwon ◽  
Sun-Jin Kim ◽  
Mansoor Asif ◽  
Bang-Wook Lee
Keyword(s):  
Electric Field ◽  
Space Charge ◽  
Field Distribution ◽  
Electric Field Distribution ◽  
Numerical Study ◽  
Numerical Approach ◽  
Dc Voltage ◽  
Charge Dynamics ◽  
Electrical Stress ◽  
Dc Stress

The influx of a switching impulse during DC steady-state operations causes severe electrical stress on the insulation of HVDC cables. Thus, the insulation should be designed to withstand a superimposed switching impulse. All major manufacturers of DC cables perform superimposed switching impulse breakdown tests for prequalification. However, an experimental approach to study space charge dynamics in dielectrics under a switching impulse superposed on DC voltage has not been reported yet. This is because, unlike the DC stress, it is not possible to study the charge dynamics experimentally under complex stresses, such as switching impulse superposition. Hence, in order to predict and investigate the breakdown characteristics, it is necessary to obtain accurate electric field distribution considering space charge dynamics using a numerical approach. Therefore, in this paper, a numerical study on the switching impulse superposition was carried out. The space charge dynamics and its distribution within the dielectric under DC stress were compared with those under a superimposed switching impulse using a bipolar charge transport (BCT) model. In addition, we estimated the effect of a superimposed switching impulse on a DC electric field distribution. It was concluded that the temperature conditions of dielectrics have a significant influence on electric field and space charge dynamics.

Observation and interpretation of space charge phenomena for high intensity

1998 ◽  
Author(s):  
I. Hofmann ◽  
R. Bär ◽  
O. Boine-Frankenheim ◽  
G. Rumolo
Keyword(s):  
Space Charge ◽  
High Intensity

scholarly journals High-intensity pulsed ion beam focusing by its own space charge

2018 ◽  
Vol 36 (4) ◽  
pp. 470-476 ◽  
Author(s):  
X.P. Zhu ◽  
Q. Zhang ◽  
L. Ding ◽  
C.C. Zhang ◽  
Yu. Isakova ◽  
...  
Keyword(s):  
Energy Density ◽  
Space Charge ◽  
High Intensity ◽  
Ion Beam ◽  
Beam Focusing ◽  
Ion Focusing ◽  
Metal Grid ◽  
Low Energy Electrons ◽  
Transport Region ◽  
Total Divergence

AbstractThe paper presents the results of a study on propagation and focusing of high-intensity pulsed ion beams, produced by a self-magnetically insulated diode of semi-cylindrical geometry at the TEMP-6 accelerator (120 ns, 200–250 kV). We examined the space-charge neutralization of the beam, the energy density in the focus, the divergence of the beam, and its shot-to-shot displacement in the focal plane. It is found that the concentration of low-energy electrons in the beam is 1.3–1.5 times higher than the concentration of ions. We observed additional ion focusing by its own space charge. With an increase in the density of the net negative (electrons and ions) charge of the beam from 3.6 to 9 µC/cm2, the total divergence (the sum of the beam divergence in the vertical and horizontal planes) decreases from 11.4 to 4.5°. It leads to an increase in the energy density in the focus from 4 up to 10–12 J/cm2. To increase the electrons concentration in the beam, a metal grid installed in the ion beam transport region was used.

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