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

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Presentation on theme: "Preliminary Results from Titan Divergence Measurements L. D. Van Woerkom Department of Physics The Ohio State University FSC Special Meeting LLNL 4-6 August."— Presentation transcript:

1 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

2 Collaborators

3 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 FSC

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

5 Rear view buried layer K  imaging CCD Laser K  fluor Bragg crystal K  (10  m res.) Cone angle 40 o Min diameter 75  m Initial e - beam size ~75  m>>~10  m laser spot (in agreement with transverse view penetration) Beam spreads with 40° full angle 30-100J/5 ps microns R. Stephens et al, PRE 69 066414 (2004) 0 50 100 150 200 250 300 0100200300400500600

6 Kα crystal (south) Ka detector Titan experiment layout

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

9 First Results Aug 2009

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

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  m tip May 2010 – 60  m tip  (full) Jul 2010 – KB

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 10 µm Al 25 µm Cu 1000 µm Al Irradiated side

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