Data processing to improving the signal of one-dimensional neutron images at Sandia's Z Pulsed Power Facility

A one-dimensional imager of neutrons (ODIN) is being used to image neutrons emitted from a line source created in Magnetized Liner Inertial Fusion (MagLIF) experiments on the Z facility. MagLIF experiments produce DD total neutron yields that range from ~1 x 10¹² to ~1 x 10¹³. The neutrons which pass through a 100-mm thick tungsten rolled-edge slit are imaged on multiple CR39 pieces used as detectors and held in alignment with pins though each piece. Each CR39 piece is etched and scanned with a microscope and the images recorded. The observed tracks are then re-binned to ODIN resolution (~500 µm). The binned data are then integrated to produce an axial profile of neutron data. New data analysis techniques have been developed to integrate multiple CR39 scans to increase signal to noise ratio. A key part of this process is correcting rotated or shifted data points that may be present from misalignments during the scanning process. Accurate accumulation of CR39 scans provide an increase in statistical accuracy of the axial profile, especially for lower yield experiments.  

 

SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.

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