Abstract
Doppler-free two-photon excitation of fluorescence may be used to measure the deuterium/tritium fuel mix in magnetic confinement fusion plasmas. Two atomic transition schemes of the hydrogen isotopes come into question for this purpose: (I) excitation of the first excited energy level (n=2) and observation of Lyman-α, (II) excitation of the second excited energy level (n=3) and observation of Balmer-α. Comparison of the two schemes indicates that both may have their merits in particular situations. Due to lack of information about the future laser characteristics achievable for scheme II, the detailed performance of this scheme cannot yet be definitely assessed.
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