- Conference date: 3-7 June 2002
- Location: Berkeley, California (USA)
In previous theoretical investigations we found that two‐photon Doppler‐free laser‐induced fluorescence (TPDF‐LIF) in the Lyman‐α line of the hydrogen isotopes may provide a diagnostic for magnetically confined fusion plasmas, in particular for the determination of the deuterium/tritium density ratio. The results obtained in these investigations were based on a quasi‐stationary treatment of TPDF‐LIF. So far, however, 243‐nm laser radiation with sufficient intensity has only been generated as pulsed radiation with pulse lengths not much longer than the decay time of the fluorescence. Moreover, under suitable conditions short‐pulse excitation may be more efficient than quasi‐stationary excitation. For both reasons we have extended our treatment to include pulsed TPDF‐LIF. Numerical calculations for representative plasma parameters show that up to about twice as many fluorescence photons as with quasi‐stationary operation can be obtained with suitable laser pulse lengths and intensities.
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