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TitleS&T Campaign: Sciences for Lethality and Protection

Kinetic LethalityPropulsion and Launch

Steven Dean (410) 278-6357 [email protected] Frank DeLucia (410) 306-0884 [email protected] Gottfried (410) 278-7573 [email protected]

Research Objective• Develop a low-cost, high-throughput experiment to

determine the shock response of lab scale quantities of novel materials

• Utilize this technique to characterize potential materials at early stages of development, realizing significant cost savings

Challenges• Obtaining a “top-hat” beam profile from a “near-

Gaussian” Nd:YAG laser • Diffractive beam-shaping optics• Diffusive beam-shaping optics

• Development of high-sensitivity/high-speed diagnostics to characterize shock induced chemistry

ARL Facilities and Capabilities Available to Support Collaborative Research• Building 1101A:

• ~3800 sq. ft. of lab space• Laser-induced air shock from energetic

materials (LASEM)• Electrostatic discharge (ESD) • Approval to store and handle energetic

materials• Multiple high-energy (1J+) Nd:YAG lasers• Extensive high-speed video capabilities• Streak camera and other spectrometers• VISAR

Complementary Expertise / Facilities / Capabilities Sought in Collaboration• Novel materials with unknown shock-related

properties• Laser-beam-shaping expertise

Bibliography:• Dean SW, De Lucia FC, Gottfried JL. Indirect ignition of

energetic materials with laser-driven flyer plates. Applied Optics. 2017 Jan 20;56(3):B134-41.

• Dean SW, De Lucia FC, Gottfried JL. Characterization of laser-driven flyer plates. New Trends in Research of Energetic Materials. 2016.

ScLP-029

Laser-Driven Flyer Plates

Laser beam profiles and high-speed video of launch process

Dimple Formation

FoilCracking

FlyerSeparation

Launch Products

Raw Beam With Beam Shaping OpticDiameter: 1.8 mm

Laser-driven flyer plate launch system

Flyer Plate

Expanding Plasma

FocusedLaser Pulse

Target

VISAR

1 2 3 4

WP

B

P

B

FPA

D FM

S

PMM

0.00

0.15

0.30

0.45

0.60

0.75

0 100 200 300

Velo

city

(km

/s)

Time (ns)

25 μm Cu

8 J/cm2

16 J/cm2

24 J/cm2

31 J/cm2

0 5 10 15 20 25

Ligh

t Int

ensi

ty (a

.u.)

Time (μs)

1300 m/s

525 m/s

650 m/s

350 m/s

*

CL-20 Impact

VISAR velocity traces, photodiode traces of CL-20 impact, schlieren imaging experimental setup