Algorithm for precision subsample timing between Gaussian-like pulses |
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Authors: | Lerche R A Golick B P Holder J P Kalantar D H |
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Affiliation: | Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA. lerche1@llnl.gov |
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Abstract: | Moderately priced oscilloscopes available for the NIF power sensors and target diagnostics have 6 GHz bandwidths at 20-25 Gsamples/s (40 ps sample spacing). Some NIF experiments require cross timing between instruments be determined with accuracy better than 30 ps. A simple analysis algorithm for Gaussian-like pulses such as the 100-ps-wide NIF timing fiducial can achieve single-event cross-timing precision of 1 ps (1/50 of the sample spacing). The midpoint-timing algorithm is presented along with simulations that show why the technique produces good timing results. Optimum pulse width is found to be ~2.5 times the sample spacing. Experimental measurements demonstrate use of the technique and highlight the conditions needed to obtain optimum timing performance. |
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