Measurement of ion species composition and impurity level by Doppler shift spectroscopy

The ion species composition and impurity level in intense hydrogen beams have been measured by observing the Doppler-shifted Balmer alpha radiation emitted from fast hydrogen atom. These results have been compared with the results obtained by magnetic mass spectrometer and found that those results for species composition were in agreement within --10%. Oxygen impurities at the level of one percent can be identified by the spectroscopy. The spectroscopy turned out to be an useful method as a beam diagnostic technique. (author)