Space and time resolved doppler spectroscopy of neutral beams

摘要

Doppler shifted Balmer-#alpha# light emission originating from collisions of neutral hydrogen beams with residual gas molecules is a method commonly used to measure species composition of hydrogen ions (H~+, H_2~+ and H_3~+) extracted from high power ion sources [1-3]. Species composition is derived from the ratio of emission intensities corresponding to full, half and third energy fractions, while the width of the emission lines provides information on beam divergence.