Abstract
Results are presented of Langmuir probe measurements in a hot filament driven tandem multipole hydrogen plasma, at present being investigated as a possible source of intense negative hydrogen ion beams for use in the neutral beam heating of nuclear fusion plasmas. The electron and ion densities, the electron temperatures and the plasma potential are measured using an automatic data collection and analysis system using an on-line microcomputer. The use of magnetic confinement and filter fields leads to a complex spatial variation of the plasma parameters. In the region of the source containing the filaments, the electron energy distribution is found to deviate from a simple Maxwellian form. The implications of this result in source modelling and efficiency are discussed. The results are presented in the form of simple scaling laws of plasma parameters on discharge conditions and on the magnetic confinement arrangement.
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