Preliminary Results from Titan Divergence Measurements L. D. Van Woerkom Department of Physics The...
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![Page 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.](https://reader038.fdocuments.net/reader038/viewer/2022103123/56649d2f5503460f94a06e3f/html5/thumbnails/1.jpg)
Preliminary Results from TitanDivergence Measurements
• L. D. Van Woerkom• Department of Physics• The Ohio State University
FSC Special MeetingLLNL4-6 August 2010
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Collaborators
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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
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Outline
• Defining electron beam divergence• Titan Experiments– August 2009– May 2010– July 2010
• Conclusions
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Rear view buried layer Ka imaging
CCD
LaserKa fluor
Bragg
crystal Ka (10 mm res.)
2000 4000 60000831_01_xray
Cone angle 40o
Min diameter 75 mm
• Initial e- beam size ~75 mm>>~10 mm
laser spot (in agreement with transverse view
penetration)
• Beam spreads with 40° full angle
30-100J/5 ps
mic
ron
s
microns
R. Stephens et al, PRE 69 066414 (2004)
0
50
100
150
200
250
300
0 100 200 300 400 500 600
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Kα crystal(south)
Ka detector
Titan experiment layout
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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
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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 depths2010 targets const. depths
• Surrounding Al eliminates interface fields
• Carbon provides get lost layer
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First Results Aug 2009
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Kα spot size and Kα yield for buried cones
May 2010, Mingsheng Wei
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July 2010 Titan results
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Summary of KB Microscope Results July 2010
H Friesen. July 28, 2010
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Everything
Aug 2009
Stephens 2004
May 2010 – 30 mm tip
May 2010 – 60 mm tip
=62 Q )full(
Jul 2010 – KB
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Source Size
• Use Cu K-alpha imager looking at front• Measure spot size for a variety of conditions• From Jan 2008
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Our main target was Al/Cu/Al
10 µm Al
25 µm Cu
1000 µm Al
Irradiated side
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Titan Kα spot diameter as a function of Pulselength
104 J
18 J
98 J
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Titan Kα spot diameter as a function of Laser energy
@ 0.7 ps
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Titan Kα spot diameter as a function of Pre-pulse
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Titan Kα spot diameter as a function of daily shot #
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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