This paper contains the results of experimental study of the process of commutation of a capacitive storage on a resistive load by a triggered spark gap switch with hollow electrodes and air blowing of interelectrode gaps, and the erosion characteristics of the electrodes. Such switch can be used as a base unit in developing of pulse-frequency generators for scientific purposes and for a number of technical applications, e.g., generators for forming a streamer discharge in plasma-chemical reactors [I]. The research was performed for the following range of parameters: long-time average transmitted power, up to 20 kW; switched energy, 1 to IO J per pulse; pulse power, 30 to SO M W voltage rise rate on the load, 2.1 8 kVis;pulse repetition rate, up to 4.5 kHz; electric power for creation of an airflow for conditioning of interelectrode gaps and electrodes cooling, 200 to 800 W.
EXPERIMENTAL SETUPThe electric circuit diagram of a experimental setup is given in Fig. 1 . Dc VOLTAGE 0 -15 kV Figure 1. Circuit diagram of experimental setup As a key K an electronic switch is used made np on the basis of IGBT transistors. This key initiates a transient process of resonance charging of a capacitor C, by a capacitor c,. After completion of the charging process, the spark gap switch S is triggered by a sharp change of potential of a switch mediate electrode. This potential is caused by an oscillatory process in the circuit G,, Cy2 ,L,, C,, which occurred at the instant of a diode D closing. L, is a stray inductance of a discharge ciIcuit, L,
Numerical simulations of SAR induced in vehicle occupants due to on-board radio transmissions have been used to investigate possible approaches for assessing compliance with electromagnetic field exposure recommendations. The simulations employed 3D numerical models based on real vehicle geometry and human simulants of realistic size and shape. Results have been obtained for transmissions from a number of simple on-board antenna installations at frequencies of 400 MHz, 900 MHz, 1.8 GHz and 2.4 GHz. Comparing the average empty vehicle field with field reference levels provides a reasonable safety factor for the basic restrictions at 400 MHz and 900 MHz. However, comparison of results obtained from identical source positions at 900 MHz, 1.8 GHz and 2.4 GHz suggest that a more cautious approach may be required for frequencies above 1 GHz.
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