Abstract
Behavior of impurity ions has been investigated using visible spectroscopy in the GAMMA10 tandem mirror. A 40 channel visible spectrometer system has been developed for measurements of the ion temperature and ion flow velocity. The spectrometer consists of a 100 cm monochromator, a 40 channel optical fiber array and an image intensifier tube coupled with a charge coupled device TV camera. The spectra from low ionization states of oxygen and carbon are measured in ion cyclotron range of frequency heated plasmas. High ion temperatures (3-10 keV) of O4+ are observed in the anchor region, where the minimum B mirror field is produced by baseball coils. The O4+ ion is heated by the fourth harmonic frequency of O4+, which is most likely due to the cyclotron higher harmonic damping.
Original language | English |
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Pages (from-to) | 332-335 |
Number of pages | 4 |
Journal | Review of Scientific Instruments |
Volume | 70 |
Issue number | 1 II |
Publication status | Published - 1999 Jan 1 |
All Science Journal Classification (ASJC) codes
- Instrumentation