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