m. s. tillack, y. tao, f. najmabadi proposed contributions to jupiter-iii by the laser-matter...
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M. S. Tillack, Y. Tao, F. Najmabadi
Proposed contributions to Jupiter-III
by the laser-matter interactions group
Briefing to Prof. Yoshio Ueda20 November 2006
San Diego, CA
1. Ablation plume dynamics
• Particle acceleration, internal structure of plumes, phase change physics
2. Applications of short-pulse lasers in surface-heating experiments
• Metal mirrors, IFE chamber armor
3. EUV lithography
• 13.5-nm light emission, plume transport
Our group has 10 years of experience studying laser heating
and ablation
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These skills can accelerate the fielding of experiments and
diagnostics in PISCES
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1. Applications of short-pulse lasers for heating and ablation experiments
2. Laser blow-off impurity injection diagnostic
3. Time-resolved SXR imaging
Three contributions are proposed:
Laser heating and ablation experiments performed with Nd:YAG
and excimer lasers
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Time (10-7s)
Tmelt
HAPL optics(108 W/cm2)
HAPL armor(109 W/cm2)
Ablation physics
(1010–1011 W/cm2)
IFE
EUVL
We are studying laser blow-off as a diagnostic technique for MFE plasmas
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• Interferometry• Shadowgraphy• Fast (2 ns) visible imaging• Time and space resolved spectroscopy• Witness plates
Thin films were fabricated and accelerated by back-side illumination
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400 mm
40 mm
10 mm
Film material: NiFilm thickness: 700 nmSubstrate: 1 mm glassWavelength: 1.064 mPulse duration: 7 nsLaser Energy: 500 mJIntensity: 1 GW/cm2
200 mm
1 mm
Studies were performed on the ejecta velocity and structure vs. composition, thickness, intensity
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100 ns 500 ns 800 ns
Visible emission
Shadowgraphy
Confinement of ejecta and avoidance of ionization are important to
penetrate the plasma and retain spatial resolution
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Vis
ible
em
issi
on
@500 ns
• FWHM=1 mm
• V=3 km/s
• Emission and witness plate shows plume is mostly neutral
10 m
Soft x-ray imaging can be used together with blowoff to study
transport physics
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Stutman et al.,RSI 77, 330 2006.
• We can add time-resolved 2D imaging at low cost
Y. Tao et al., RSI 75, 5173 (2004).
Y. Tao et al., APL 85, 1919 (2004).
• We use a similar diagnostic for EUVL research
JenOptik E-mon
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