Abstract
Ion energies, temperatures, and ion-confining potentials in open-ended plasma-confinement devices are clearly measured with our newly designed ion-energy spectrometer. This energy spectrometer has specific structures with obliquely positioned multiple grids. Such a grid geometry makes it possible to separate ions and electrons completely. This electrostatic spectrometer also has the following characteristics: (1) no use of internal magnetic fields (being different from E| B spectrometers); and (2) the use of a simple single-channel collector plate for obtaining differential ion-energy spectra (being different from energy-integrated spectra using Faraday cups). These characteristics provide us with easy handling of the spectrometer including an easy alignment of the radially scannable spectrometer in a plasma-confinement device.
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