Titanium dioxide nanofiber-cotton targets for efficient multi-keV x-ray generation

Tanabe, Minoru; Nishimura, Hiroaki; Fujioka, Shinsuke; Nagai, Keiji; Yamamoto, Norimasa; Gu, Zhongze; Pan, Chao; Girard, Frédéric; Primout, M.; Villette, B.; Brebion, D.; Fournier, K. B.; Fujishima, Akira; Mima, K.

doi:10.1063/1.2969300

Cited by 35 publications

(26 citation statements)

References 18 publications

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“…2,3 Foams are useful not only for fundamental study, but also for applications to desirable temperature control. For example, such a low-density effect has been studied by using a double pulse scheme, where efficient x-ray generation was established 30 years ago using copper targets.…”

Section: Introductionmentioning

confidence: 99%

“…Low density foam targets on the other hand, have a well defined geometry and density before laser illumination, and these have been used for laser-plasma interactions, 2,14,15 the study of laser shock measurements, [16][17][18] thermal smoothing effect, [19][20][21][22] quantum beam generation, 3,23 coulomb explosion, 24 and laboratory astrophysics. 25,26 Additionally, low density foams have been utilized as a mold of cryogenic targets.…”

Section: Introductionmentioning

confidence: 99%

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A review of low density porous materials used in laser plasma experiments

2018

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This review describes and categorizes the synthesis and properties of low density porous materials, which are commonly referred to as foams and are utilized for laser plasma experiments. By focusing a high-power laser on a small target composed of these materials, high energy and density states can be produced. In the past decade or so, various new target fabrication techniques have been developed by many laboratories that use high energy lasers and consequently, many publications and reviews followed these developments. However, the emphasis so far has been on targets that did not utilize low density porous materials. This review therefore, attempts to redress this balance and endeavors to review low density materials used in laser plasma experiments in recent years. The emphasis of this review will be on aspects of low density materials that are of relevance to high energy laser plasma experiments. Aspects of low density materials such as densities, elemental compositions, macroscopic structures, nanostructures, and characterization of these materials will be covered. Also, there will be a brief mention of how these aspects affect the results in laser plasma experiments and the constrictions that these requirements put on the fabrication of low density materials relevant to this field. This review is written from the chemists' point of view to aid physicists and the new comers to this field.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A review of low density porous materials used in laser plasma experiments

2018

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“…For certain applications, such as the study of x-ray driven electromagnetic phenomena, or radiography of high-density objects, high-energy, deeply penetrating x-ray photons are required. In addition to the K-shell Kr and Xe sources, x-ray sources at other energies need to be developed; for example, pre-exploded metal foils 22,23 , foil-lined cylinders 24 , metal nano-fiber low-density targets 21 , and metal-doped aerogel materials 20 are all candidates for highly efficient xray sources. In conclusion, an enormous expanse of x-ray source development activities exist, now that an unexplored regime of laser energy and power is available at the NIF.…”

Section: Discussionmentioning

confidence: 99%

“…The target design for the current experiments builds on experience at the Nova 29 and Omega 30 laser facilities using modeling and simulation tools that have been validated against experiments [12][13][14][15][16][17][18][19][20][21][22][23][24] . The desired x-ray source characteristics for the present experiments were: a) significant multi-keV x-ray output with energies >3 keV, b) x-ray pulse width of order 5 ns, and c) x-ray rise-time of order 1 ns or longer.…”

Section: A Target Descriptionmentioning

confidence: 99%

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Multi-keV x-ray source development experiments on the National Ignition Facility

et al. 2010

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We report results from a five shot campaign carried out with Ar-Xe gas-filled targets at the National Ignition Facility (NIF). The targets were shot with ≈ 350 kJ of 3ω laser energy delivered with a 5 ns trapezoidal laser pulse. We report measured x-ray output from the target in different spectral bands both below and above 1.5 keV photon energies: we find yields of ≈20.5 kJ/sr with peak x-ray power approaching 4 TW/sr over all energies, as measured for the unique viewing angle of our detector, and ≈3.6 kJ/sr with peak x-ray power of 1 TW/sr for x rays with energies >3 keV. This is a laser-to-x-ray conversion efficiency of 13±1.3 % for isotropic x rays with energies >3 keV. Laser energy reflected by the target plasma for both inner and outer-cone beams is measured and found to be small, between 1-4% of the drive energy. The energy emitted in hard x rays (with energies >25 keV) is measured and found to be ≈1 J/sr. Two-dimensional imaging of the target plasma during the laser pulse confirms a fast, volumetric heating of the entire target, resulting in efficient laser-to-x-ray conversion. Post-shot simulations with a two-dimensional radiation-hydrodynamics code reproduce well the observed x-ray flux and fluence, backscattered light, and bulk target motion.

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Fabrication and characterization of composition-gradient CuO/SiO2 composite aerogel

Tang

et al. 2013

J Sol-Gel Sci Technol

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Titanium dioxide nanofiber-cotton targets for efficient multi-keV x-ray generation

Cited by 35 publications

References 18 publications

A review of low density porous materials used in laser plasma experiments

A review of low density porous materials used in laser plasma experiments

Multi-keV x-ray source development experiments on the National Ignition Facility

Fabrication and characterization of composition-gradient CuO/SiO2 composite aerogel

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