Compressed Streak Imaging Beam Diagnostic

Conference · Wed Jun 03 00:00:00 EDT 2015 · Pulsed Power Conference (PPC), 2015 IEEE, DOI: 10.1109/PPC.2015.7297039

DOI:https://doi.org/10.1109/PPC.2015.7297039· OSTI ID:1241515

Marks, Daniel G. ^[1]; Frayer, Daniel K. ^[1]

---

1. National Security Technologies, LLC. (NSTec), Mercury, NV (United States)

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.

• Research Organization: Nevada Test Site/National Security Technologies, LLC (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: AC52-06NA25946
• OSTI ID: 1241515
• Report Number(s): DOE/NV/25946--2488
• Journal Information: Pulsed Power Conference (PPC), 2015 IEEE, DOI: 10.1109/PPC.2015.7297039, Journal Name: Pulsed Power Conference (PPC), 2015 IEEE, DOI: 10.1109/PPC.2015.7297039
• Country of Publication: United States
• Language: English