Compressed streak imaging beam diagnostic


Conference Paper

© 2015 IEEE. We are planning a new beam diagnostic based on Compressed Ultrafast Photography (CUP)1. A foil inserted in the beam path is used to generate a continuous optical image of the beam, which is the same technique used on the existing DARHT II beam imaging diagnostic. This existing diagnostic compresses the beam image with anamorphic lenses into four views that are streaked simultaneously on two streak cameras. In our new beam diagnostic design the anamorphic lenses are replaced with regular lenses and the beam image is stamped with a pseudo-random mask pattern. The full image is imaged onto a streak camera with its entrance slit expanded. Modifying the CUP technique, which uses a single streaked image, our design splits the image into four rotated copies and puts all four images on two streak cameras. A data cube of multiple image frames is reconstructed from the streak camera data through the use of the TwiST algorithm2 combined with total variation denoising3. The additional rotated images improve spatial resolution and reduce noise and image artifacts compared to using a single streaked image. In reconstructions of simulated data, fine detail in the beam profile can be seen and there is a remarkable absence of image artifacts compared to the existing DARHT II beam imaging diagnostic. Performance was evaluated using a pseudo-MTF derived from a simulated wave pattern test object.

Full Text

Duke Authors

Cited Authors

  • Marks, D; Frayer, D

Published Date

  • October 12, 2015

Published In

  • Digest of Technical Papers Ieee International Pulsed Power Conference

Volume / Issue

  • 2015-October /

International Standard Book Number 13 (ISBN-13)

  • 9781479984039

Digital Object Identifier (DOI)

  • 10.1109/PPC.2015.7297039

Citation Source

  • Scopus