Dante spectral unfolds of Omega experiments using a Backus-Gilbert method*

The Dante diagnostic is essential for measuring x-rays in Omega and NIF experiments [1,2]. Its contribution to understanding the temporal history and spectral shape of the x-ray radiation is instrumental in evaluating high-temperature plasmas. Dante consists of multiple absolutely calibrated, time-resolved filtered XRDs. Exposing several XRD detectors with different spectral responses to x-rays enables one to infer the incident spectrum from the data. The data from Dante consists of voltage waveforms recorded on fast oscilloscopes. An unfold attempts to reconstruct the spectrum from the measured voltages and the energy-dependent response functions. Implementing the Backus-Gilbert inverse method is straightforward and offers control between stability and resolution. The spectrum and flux from a Backus-Gilbert inverse approach will be compared to the standard Dante unfold method [1,2] from Omega targets.

[1] C. Sorce et al. Rev. Sci. Instrum. 77, 10E518 (2006)

[2] J.L. Kline et al. Rev. Sci. Instrum. 81, 10E321 (2010)

*Supported by DTRA.

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