Effects of collision between two plumes on plume expansion dynamics during pulsed laser ablation in background gas

Umezu, Ikurou; Sakamoto, Naomichi; Fukuoka, Hiroshi; Yokoyama, Yasuhiro; Nobuzawa, Koichiro; Sugimura, Akira

doi:10.1007/s00339-012-7141-x

Cited by 9 publications

(2 citation statements)

References 17 publications

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“…Therefore, the number of debris can be reduced in mounting substrate appropriate position behind the shield. Double pulsed laser ablation (DPLA) was proposed by Umezu, et al to prepare hybrid-nanocrystalline films [8][9]. In DPLA process, individual two pulsed lasers irradiate opposing two different targets and two plumes are ejected into the flow field with shock waves.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Behavior on Opposing Unsteady Supersonic Jets in a Flow Field with Shields

Kinoshita

Fukuoka²,

Umezu

2018

MSF

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Collision dynamics of opposing unsteady supersonic jets injected in background gas with shock waves were calculated to simulate double pulsed laser ablation. Since the jets are deflected by collision and the motion of debris is ballistic. This characteristic can be used to reduce the number of debris when shields are mounted in front of substrate. The flow of jets through installed shields is complicated by the interaction between shields and jets, and between shields and shock waves. We investigate influence of shield position on the shock waves and the jets by numerical calculations. Axisymmetric two-dimensional compressible Euler equations were solved using the finite volume method by using ANSYS Fluent 14.0.0 code. The shields with slit was mounted parallel to the direction of initially injected jets. In order to investigate the influence of shield position on the shock waves and the jets, the shield position and background gas pressure were adopted as parameters. The jets and shock wave are deflected by collision and they can pass through the slit of shields. The passed shock wave reflects at the substrate mounted behind the slits and it forces back the jet to decrease the jet velocity. The shield position governs the velocity and amount of the jet that reach the substrate.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Behavior on Opposing Unsteady Supersonic Jets in a Flow Field with Shields

Kinoshita

Fukuoka²,

Umezu

2018

MSF

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“…Previous studies showed that charge-exchange collisions among the species in the plume happening during interpenetration of the plasmas at early time followed by formation of a stagnation layer at later times [4,20,21]. Studies showed that colliding plasma experiments can also be used to simulate aerosol formation in fusion chamber walls [22] and to generate nanoparticles [23].…”

Section: Introductionmentioning

confidence: 99%

Molecular formation in the stagnation region of colliding laser-produced plasmas

Al-Shboul

Hassan

Harilal

2016

Plasma Sources Sci. Technol.

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Laser-produced colliding plasmas have numerous attractive applications, and the stagnation layer formed during collisions between plasmas is a useful system for understanding particle collisions and molecular formation in a controlled way. In this article, we explore carbon dimer formation and its evolutionary paths in a stagnation layer formed during the interaction of two laser-produced plasmas. Colliding laser-produced plasmas are generated by splitting a laser beam into two sub-beams and then focusing them into either a single flat graphite target (laterally colliding plasmas) or a V-shaped graphite target (orthogonally colliding plasmas). C 2 formation in the stagnation region of both colliding plasma schemes is investigated using optical spectroscopic means and compared with emission features from a single seed plasma. Our results show that the collisions between the plasmas followed by stagnation layer formation lead to rapid cooling, causing enhanced carbon dimer formation. In addition, plasma electron temperature, density, and C 2 vibrational temperature were measured for the stagnation zone and compared with a single seed plasma.

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Dynamics of colliding laser ablation plumes in background gas

et al. 2016

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Effects of collision between two plumes on plume expansion dynamics during pulsed laser ablation in background gas

Cited by 9 publications

References 17 publications

Numerical Analysis of Behavior on Opposing Unsteady Supersonic Jets in a Flow Field with Shields

Numerical Analysis of Behavior on Opposing Unsteady Supersonic Jets in a Flow Field with Shields

Molecular formation in the stagnation region of colliding laser-produced plasmas

Dynamics of colliding laser ablation plumes in background gas

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