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The homogenous discharges in helium, neon and argon begin with Townsend discharge and end at sub-normal glow discharge. The current limitation by dielectric induces the discharge end before normal glow discharge is reached. Penning ionization between the metastable atoms of the noble gases and impurities plays an important role in the formation of the homogenous discharges. It is easy to realize homogeneous...
Summary form only given. Because of higher hold-off voltage and higher current than power semiconductor such as GTO, MOSFET, PCSS, SOS etc., spark gap switches are generally used in the last output stage of high power modulator. But its recovery time is millisecond level, so it is prevented on the high rep-rate conditions. The gaseous recovery in a spark gap was investigated by using Two-pulses method...
A 4-month data set was used to investigate historical changes between the number of the Cyanobacteria and concentrations of total nitrogen (TN), total phosphorus (TP), TN:TP, chemical oxygen dawdling (COD), NO3, pH and Chl-a in a shallow temperate zone lake (Guishui Lake, Beijing, China). The aim was to evaluate changes in the risk of Cyanobacteria blooms, which have occurred several times in the...
A 10 kV square wave generator was constructed and tested. The generator consists of a DC high voltage source, a pulse forming line (PFL) made from 50 ohm commercial cable, a spark gap switch filled with pressurized nitrogen and a pulse transmission line (PTL) made from the same cable as PFL. By changing the PFL length the pulse width of the generator could be changed. The amplitude of the output voltage...
The gas discharge in a gas peaking switch was divided into three phases as gas breakdown, voltage collapse, and gaseous recovery. The development of the discharge was numerically simulated. Nitrogen and hydrogen at pressure ranging from 30 to 100 atm were chosen as working gases. The breakdown field of nitrogen is much higher than that of hydrogen, and a value of 4 MV/cm is achieved for a 0.6-mm nitrogen...
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