Images of the laser entrance hole from the static x-ray imager at NIF

Schneider, M. B.; Jones, O. S.; Meezan, N. B.; Milovich, J. L.; Town, R. P.; Alvarez, S. S.; Beeler, R. G.; Bradley, D. K.; Celeste, J. R.; Dixit, S. N.; Edwards, M. J.; Haugh, M. J.; Kalantar, D. H.; Kline, J. L.; Kyrala, G. A.; Landen, O. L.; MacGowan, B. J.; Michel, P.; Moody, J. D.; Oberhelman, S. K.
October 2010
Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10E538
Academic Journal
The static x-ray imager at the National Ignition Facility is a pinhole camera using a CCD detector to obtain images of Hohlraum wall x-ray drive illumination patterns seen through the laser entrance hole (LEH). Carefully chosen filters, combined with the CCD response, allow recording images in the x-ray range of 3-5 keV with 60 μm spatial resolution. The routines used to obtain the apparent size of the backlit LEH and the location and intensity of beam spots are discussed and compared to predictions. A new soft x-ray channel centered at 870 eV (near the x-ray peak of a 300 eV temperature ignition Hohlraum) is discussed.


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