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Preliminary Results from Titan Divergence Measurements

Preliminary Results from Titan Divergence Measurements. L. D. Van Woerkom Department of Physics The Ohio State University. FSC Special Meeting LLNL 4-6 August 2010. Collaborators. FSC. Funding. Office of Fusion Energy Science (OFES) Advanced Concept Exploration Program

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Preliminary Results from Titan Divergence Measurements

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  1. Preliminary Results from TitanDivergence Measurements L. D. Van Woerkom Department of Physics The Ohio State University FSC Special Meeting LLNL 4-6 August 2010

  2. Collaborators

  3. FSC Funding • Office of Fusion Energy Science (OFES) • Advanced Concept Exploration Program • Fusion Science Center (FSC) • This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344

  4. Outline • Defining electron beam divergence • Titan Experiments • August 2009 • May 2010 • July 2010 • Conclusions

  5. Bragg crystal CCD Ka (10 mm res.) Ka fluor Laser Rear view buried layer Ka imaging 300 R. Stephens et al, PRE 69 066414 (2004) 30-100J/5 ps 250 200 • Initial e- beam size ~75 mm>>~10 mm laser spot (in agreement with transverse view penetration) • Beam spreads with 40° full angle microns 150 Cone angle 40o Min diameter 75 mm 100 50 0 0 100 200 300 400 500 600 microns

  6. Titan experiment layout Ka detector Kα crystal (south)

  7. B01 series,15 Al/25 Cu/25 Al/25 Al/1mm CH From top right to bottom left: B02-1, no background subtraction; B02-2, couldn’t tell where signal started and background end; B02-3, no background subtraction; B02-4, no background subtraction

  8. Buried Cones -- New • Targets: • Electrical Discharge Machine (EDM) • start w/ solid uniform Al foil, EDM cone holes, glue C get lost Cu Al 2009 targets  varied depths 2010 targets  const. depths C • Surrounding Al eliminates interface fields • Carbon provides get lost layer As deep as we can image. 200 um? 15° half angle

  9. First Results Aug 2009

  10. May 2010, Mingsheng Wei Kα spot size and Kα yield for buried cones

  11. July 2010 Titan results

  12. Summary of KB Microscope Results July 2010 H Friesen. July 28, 2010

  13. Everything Aug 2009 Stephens 2004 May 2010 – 30 mm tip May 2010 – 60 mm tip Jul 2010 – KB Q=62 (full)

  14. Source Size • Use Cu K-alpha imager looking at front • Measure spot size for a variety of conditions • From Jan 2008

  15. Our main target was Al/Cu/Al 1000 µm Al 10 µm Al Irradiated side 25 µm Cu

  16. Titan Kα spot diameter as a function of Pulselength 98 J 18 J 104 J

  17. Titan Kα spot diameter as a function of Laser energy @ 0.7 ps

  18. Titan Kα spot diameter as a function of Pre-pulse

  19. Titan Kα spot diameter as a function of daily shot #

  20. Conclusions • Alignment very difficult • Lots of scatter due to misalignment • Good alignment shows no real difference from flats • Full angle ~ 60-80 degrees • Good News? • Effects of cone structure not dominant • Can use flats for source studies

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