A comparison of quasi-steady with short-pulse discharge thruster operation

1972 ◽  
Author(s):  
W. GUMAN
Keyword(s):  
Short Pulse ◽  
Pulse Discharge

Investigations of a compact short-pulse discharge-excited XeCl laser

1993 ◽  
Vol 98 (1-3) ◽  
pp. 172-180 ◽  
Author(s):  
Z.M. Xia ◽  
E.A. Ballik
Keyword(s):  
Short Pulse ◽  
Pulse Discharge ◽  
Xecl Laser

scholarly journals Inter-application communication during LHD consecutive short pulse discharge experiment

2018 ◽  
Vol 129 ◽  
pp. 190-195
Author(s):  
Masahiko Emoto ◽  
Hideya Nakanishi ◽  
Masanobu Yoshida ◽  
Masaki Ohsuna ◽  
Hideki Ogawa ◽  
...  
Keyword(s):  
Short Pulse ◽  
Pulse Discharge ◽  
Discharge Experiment

scholarly journals Study on the Discharge Characteristics of Single-Pulse Discharge in Micro-EDM

Micromachines ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 55 ◽  
Author(s):  
Qingyu Liu ◽  
Qinhe Zhang ◽  
Min Zhang ◽  
Fazhan Yang
Keyword(s):  
Electrical Discharge Machining ◽  
Short Pulse ◽  
Pulse Discharge ◽  
Single Pulse ◽  
Energy Utilization ◽  
Utilization Rate ◽  
Micro Edm ◽  
Discharge Characteristics ◽  
Discharge Duration ◽  
Positive Ion

To further study the discharge characteristics and machining mechanism of micro-electrical discharge machining (micro-EDM), the variation trends of the discharge energy and discharge crater size with actual discharge duration are discussed based on single-pulse experiments. The polarity effect of micro-EDM was analyzed according to the motion characteristics of electrons and ions in the discharge plasma channel. The results show that the discharge current and voltage of micro-EDM were independent of the discharge width and open-circuit voltage. The energy utilization rate of the short-pulse discharge was relatively high, and the energy utilization rate decreased gradually as the discharge duration increased. Even if the mass of the positive ion was much larger than that of the electron, the kinetic energy of the positive ion was still less than that of the electron when bombarding the surface of the electrode. The acceleration and speed of electrons were very high, and the number of times that electrons bombarded the surface of positive electrode was more than 600 times that of positive ions bombarding the surface of the negative electrode during the same time.

Research of short pulse discharge XeCl laser

2005 ◽  
Author(s):  
Yu. I. Bychkov ◽  
Valery F. Losev ◽  
Yury N. Panchenko ◽  
Arkadi G. Yastremsky ◽  
S. A. Yampolskaya
Keyword(s):  
Short Pulse ◽  
Pulse Discharge ◽  
Xecl Laser

EDM Properties of a Low Wear Electrically Conductive CVD Diamond Electrode

2007 ◽  
Vol 339 ◽  
pp. 168-176 ◽  
Author(s):  
Manabu Iwai ◽  
A. Sharma ◽  
Wei Li Pan ◽  
Sadao Sano ◽  
Tetsutaro Uematsu ◽  
...  
Keyword(s):  
Specific Resistance ◽  
Short Pulse ◽  
Pulse Discharge ◽  
Cvd Diamond ◽  
Copper Electrode ◽  
Electrode Wear ◽  
Electrically Conductive ◽  
Diamond Electrode ◽  
Electrode Polarity ◽  
Pulse On Time

It has been reported in our previous report that electrically conductive CVD diamond (hereafter, EC-CVD diamond) having specific resistance of the order of 1x10-3 Ω⋅m shows almost zero electrode wear even at the short pulse duration of 3μs on a die-sinking EDM machine. In this research EDM properties are investigated in the context of the pulse on time in oil and water. It is found that the electrode polarity has an effect on the electrode wear of the EC-CVD diamond electrode in oil. In the test in oil, EC-CVD diamond shows zero wear at positive [+] electrode polarity but a higher wear at negative [-] electrode polarity than that of the copper electrode. Furthermore, the EC-CVD diamond electrode showed very less wear than copper even in water. These results in oil and water may be due to the high thermal diffusivity, an increased rate of carbon adhesion and the high thermal stability of the EC-CVD diamond electrode. Workpiece surface roughness using the EC-CVD diamond electrode is about 20~50% lower than using the copper electrode under the same EDM conditions. From the single pulse discharge experiment with EC-CVD diamond and copper electrodes, the improvement in roughness is explained by the dispersion of the discharge in the case of EC-CVD diamond due to its rather high specific resistance.

Some Considerations of the Pulse Power Switch Centered on Thyristor Device

2013 ◽  
Vol 336-338 ◽  
pp. 60-64
Author(s):  
Wei Bo Li ◽  
Wang Xin ◽  
Quan Feng ◽  
Wei Chao Li ◽  
Zhao Long Sun
Keyword(s):  
Short Pulse ◽  
Pulse Discharge ◽  
High Energy ◽  
Air Cooling ◽  
Electromagnetic Launchers ◽  
Thyristor Switch ◽  
Blocking Voltage ◽  
Short Time ◽  
Thyristor Device ◽  
Selection Of

For high energy short pulse discharge applications, like electromagnetic launchers or magnetic forming, mostly the thyristor technology is used. The presented thyristor switch assemblies using 125 mm wafer size are made to switch 62.4MJ stored energy into a load in very short time. The maximum transient peak current of 26 kilo-amperes peak for 20 ms with convection water and air cooling. For this presentation we concentrate on the Thyristor technology as this offer the highest current capability but are not in the position to switch-off any current. Some measures must be used to the pulse switch centered on Thyristor device, i.e., proper selection of the static and dynamic parameters of the thyristor, enough power for triggering the device, and efficient cooling of the device, which can make it possible to produce devices with high blocking voltage combined with very high current handling.

Multiphoton ionization by a very short pulse

2017 ◽  
Vol 187 (11) ◽  
pp. 1280-1287 ◽  
Author(s):  
Leonid V. Keldysh
Keyword(s):  
Short Pulse ◽  
Multiphoton Ionization
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