THERMAL PLASMA SOURCE OF HYDROGEN ATOMS AND IONS

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Abstract
A cascade arc is used as a source for a hydrogen/argon particle beam. The plasma is produced at thermal plasma conditions in the pressure range of 0.1 to 1 bar. It is expanded with a high velocity into a vacuum chamber. Measurements with a Langmuir double probe and with a mass spectrometer are performed. The resulting parameters of the plasma and the extracted ions are discussed. Molecular processes as charge exchange and dissociative recombination appear to be important

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