Adaptation of a cubic smoothing spline algorithm for multi-channel data stitching at the National Ignition Facility

Charles G. Brown Jr.; Aaron B. Adcock; Stephen G. Azevedo; Judith A. Liebman; Essex J. Bond

doi:10.1117/12.878918

18 February 2011 Adaptation of a cubic smoothing spline algorithm for multi-channel data stitching at the National Ignition Facility

Charles G. Brown Jr., Aaron B. Adcock, Stephen G. Azevedo, Judith A. Liebman, Essex J. Bond

Author Affiliations +

Proceedings Volume 7916, High Power Lasers for Fusion Research; 79160P (2011) https://doi.org/10.1117/12.878918
Event: SPIE LASE, 2011, San Francisco, California, United States

Abstract

Some diagnostics at the National Ignition Facility (NIF), including the Gamma Reaction History (GRH) diagnostic, require multiple channels of data to achieve the required dynamic range. These channels need to be stitched together into a single time series, and they may have non-uniform and redundant time samples. We chose to apply the popular cubic smoothing spline technique to our stitching problem because we needed a general non-parametric method. We adapted one of the algorithms in the literature, by Hutchinson and deHoog, to our needs. The modified algorithm and the resulting code perform a cubic smoothing spline fit to multiple data channels with redundant time samples and missing data points. The data channels can have different, timevarying, zero-mean white noise characteristics. The method we employ automatically determines an optimal smoothing level by minimizing the Generalized Cross Validation (GCV) score. In order to automatically validate the smoothing level selection, the Weighted Sum-Squared Residual (WSSR) and zero-mean tests are performed on the residuals. Further, confidence intervals, both analytical and Monte Carlo, are also calculated. In this paper, we describe the derivation of our cubic smoothing spline algorithm. We outline the algorithm and test it with simulated and experimental data.

Citation Download Citation

Charles G. Brown Jr., Aaron B. Adcock, Stephen G. Azevedo, Judith A. Liebman, and Essex J. Bond "Adaptation of a cubic smoothing spline algorithm for multi-channel data stitching at the National Ignition Facility", Proc. SPIE 7916, High Power Lasers for Fusion Research, 79160P (18 February 2011); https://doi.org/10.1117/12.878918

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