T.E. Cowan, Y. Sentoku, M. Bakeman, B. Chrisman*, E. d’Humieres, S. Gaillard, J. Rassuchine* Department of Physics University of Nevada, Reno Fusion Science Center of Excellence for Fast Ignition and Extreme States of Matter NTF Status, Cone Target Physics Chicago O’Hare Hilton 28 February 2007 *partial graduate support from FSC
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T.E. Cowan, Y. Sentoku, M. Bakeman, B. Chrisman*, E. d’Humieres, S. Gaillard, J. Rassuchine*
Fusion Science Center of Excellence for Fast Ignition and Extreme States of Matter NTF Status, Cone Target Physics Chicago O’Hare Hilton 28 February 2007. T.E. Cowan, Y. Sentoku, M. Bakeman, B. Chrisman*, E. d’Humieres, S. Gaillard, J. Rassuchine* Department of Physics - PowerPoint PPT Presentation
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T.E. Cowan, Y. Sentoku,M. Bakeman, B. Chrisman*, E. d’Humieres, S. Gaillard, J. Rassuchine*
Department of PhysicsUniversity of Nevada, Reno
Fusion Science Center of Excellence for Fast Ignition and Extreme States of Matter
NTF Status, Cone Target Physics
Chicago O’Hare Hilton 28 February 2007
Fusion Science Center of Excellence for Fast Ignition and Extreme States of Matter
NTF Status, Cone Target Physics
Chicago O’Hare Hilton 28 February 2007
*partial graduate support from FSC
• Schedule shift due to budget continuing resolution (CR)
• Commissioning and laser characterization planned through FY07
• Insufficient support for outside “users” while under CR
• Minimal “start up” test experiments might be possible within limited UNR program (i.e., collaboration, not as user)
• Point of Contact: T.C., or Jeff Thompson, Acting Director
Leopard laser commissioning in progress
On the brighter side…. Good progress with nanofabricated cone-shaped laser targets….
Free Standing Au (10 m wall)
Free Standing Cu (10m wall)
x-ray
proton
x-ray
HED
Smoother (!) than prior cones
Inside sub-micron tip apex: conical, with vestige of Si etch planes. Closer to sharp-tip, Sentoku simulation
37.3 um
16.7 um 3.33 um
1.0 um 500 nm
March 2006 LANL-Trident, enhanced proton beam, Au “pizza” tops~2.5% conversion efficiency to protons, 1.5x max energy(M. Hegelich, K. Flippo)
June 2006 LLNL-Titan, proton acceleration(P. Patel, J. Rassuchine, S. Gaillard)
July 2006 LULI-100 TW, Au “pizza” tops, reduced mass, pre-pulse!(S. Gaillard, J. Rassuchine, M. Bakeman, J. Fuchs, M. Borghesi, O. Willi)
August 2006 LANL-Trident, systematics of Au “pizza” tops, alignment!(K. Flippo, S. Gaillard, J. Rassuchine, M. Bakeman, M. Hegelich)
December 2006 LULI-100 TW, 1, 2 comparison with Cu cones & funnelsx-ray emission from hot Cu – similar to 50 m reduced mass(S. Baton, M. Koenig, J. Rassuchine, R. Kodama)
2: ionization above F-like. Comparable yield/heating to 50 m dia. reduced mass, despite huge mass
1w: Total Cold Cu Ka for cones ~ 1.5x higher yield than Multilayer
2w: Total Cold Cu Ka for cone~ 2-4x higher yield than Multilayer and Reduced Mass
Conical Crystal Spectrometer
0
20000
40000
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140000
0 10 20 30 40 50 60 70 80 90 100 110 120
Shot Number
To
tal
Inte
gra
ted
Ka
lph
a1
an
d
Ka
lph
a2
(a
.u.)
Sharp Tip Cones Blunt Tip Cones Funnel Cones Multilayer Targets Reduced Mass Targets
1w 2w 1w
“Cold” K yield (Ne-like to neutral)
Conical Crystal Spectrometer
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0 10 20 30 40 50 60 70 80 90 100 110 120
Shot Number
Ho
t S
pe
ctu
m (
a.u
.)
Sharp Tip Cones Blunt Tip Cones Funnel Cones MultiLayer Flat Reduced Mass Targets
1w 2w 1w
“Hot” Cu x-ray yield (Li-like to F-like)
- Nanofabrication techniques are promising.….
- Preplasma filling (laser contrast) appears to be very important….
- Enhanced proton acceleration observed (confined hot electron sheath)
- X-ray emisison from hot matter observed (similar to reduced mass foils)
- Interesting alternative/complement to reduced mass targets:- hot electron concentration- maintains sheath quality for acceleration- more mass for x-ray production- mass produced on wafer- relaxed handling (at cost of more stringent contrast & pointing)- complex geometries possible