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In this paper we have demonstrated that the negative and positive corona discharge in air at atmospheric pressure is a convenient physical method for the initiation of the high-reaction-rate polymerization process of the linseed oil. The different stages of the polymerization process were investigated by infrared (IR) spectroscopy and the formation of the linseed oil polymer was evaluated by the presence of the C-O-C bands.

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A pulsed self-collimated intense electron beam of diameter less than 1 mm, a few centimetres in length and up to 280 A peak current, 20 ns pulse duration and 50 Hz repetition rate is produced along the axis of a cylindrical discharge tube using the synergy of two discharges. It needs neither bore holes nor internal electrodes and can be obtained in various gases and for a large range of tube diameters.

The energy distribution function of the electron beam produced in a transient hollow cathode discharge is measured using a method which is based on the collector self-biasing, allowing an access very close to the extraction hole. The distribution obtained is a mainly polyenergetic one extending over a range of up to some tenths of kiloelectronvolts. It is composed both of runaway electrons, whose energies we assume are equal to the instant discharge voltage, and a main part composed of a monotonically decreasing energy distribution. The ratio between these two populations is around 10% and strongly increases with distance from the extraction hole.