Abstract
The method of contact ionization is used to produce a three-component plasma (Cs+, Cl−, e−) in the Q-device BARBARA using a beam of Cesium chloride. The end-plate temperature controls the concentration of Cl−, which can be varied in a wide range. The density of negative ions is obtained from the difference between the positive ion density given by a Langmuir probe and the electron density given by a microwave resonator. A high concentration of negative ions is achieved.
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