Plasma Chemistry–2: Plasma Chemistry and Transport Phenomena by A. T. Bell

By A. T. Bell

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Read Online or Download Plasma Chemistry–2: Plasma Chemistry and Transport Phenomena in Thermal Plasmas. Transport Phenomena in Thermal Plasmas (Odeillo-Font-Romeu, 1975) PDF

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Additional info for Plasma Chemistry–2: Plasma Chemistry and Transport Phenomena in Thermal Plasmas. Transport Phenomena in Thermal Plasmas (Odeillo-Font-Romeu, 1975)

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Discharge in nitrogen was maintained in a tube of diameter 10cm; the separation of the water cooled electrodes was about 25 cm (arrangement as in Fig. 2a) and the pressure was 1 torr. At a discharge current of between 4-7 A a power of about 1-2 kW is dissipated in the discharge. f. 5 kV at 27 MHz, but is as much as 9-14 kV at 1 MHz. It is evident that the impedance matching is much more complicated at 1 MHz than at 27 MHz. Moreover, a power of up to 3 kW can be dissipated in a pyrex tube at 27 MHz and the discharge can be maintained for several thousand hours without damaging the glass.

Extremely high purity of the glass—is desirable for the application of fibres to communication purposes. Although the main problems in the preparation of low loss optical fibres have already been solved some problems, such as the achieving the definite radial index profile remain to be overcome. One way to achieve the definite profile is to approximate the desired profile by repeated layer deposition followed by diffusion equalization. This means that layers of thickness less than 1 μπι are required.

G. Ref. 1, p. f. electric field between both ends of the coil, and the coupling is in fact a capacitive one. In principle, any frequency from 50 Hz up to GHz can be used to excite gas at low pressure, but for our purposes, a frequency of 20-100 MHz is most convenient. At lower frequencies the voltage, which has to be applied to the external electrodes to maintain the discharge at a given value of the discharge current, increases significantly. Figure 2 shows schematically the discharge tube and the equivalent high frequency circuit.

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