Plume dynamics of laser-produced aluminum plasma in ambient nitrogen

Sharma, Ashwini Kumar; Thareja, R. K.

doi:10.1016/j.apsusc.2004.09.093

Cited by 66 publications

(26 citation statements)

References 26 publications

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“…The stronger plasma confinement due to much heavier N 2 molecules promotes the excitation processes closer to target surface causing stronger emission with less plasma expansion. 30,31 These results were also confirmed by OES shown in Figure 7, where spectra of carbon fs plasmas are captured in both ambient gases at varied distances.…”

Section: Resultssupporting

confidence: 65%

Emission features of femtosecond laser ablated carbon plasma in ambient helium

Al-Shboul

Harilal

Hassanein

2013

Journal of Applied Physics

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Section: Resultssupporting

confidence: 65%

Emission features of femtosecond laser ablated carbon plasma in ambient helium

Al-Shboul

Harilal

Hassanein

2013

Journal of Applied Physics

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“…They represent a best average initial energy ͑U 0 ͒ for ion electrodynamic simulations in SIMION. Laser generated plasma plumes expand in a conelike manner [41][42][43][44][45] typically at an angle of ϳ30°-35°. This occurs via adiabatic expansion upon termination of the laser pulse.…”

Section: Simion Simulationsmentioning

confidence: 99%

The DCU laser ion source

Yeates¹,

Costello

Kennedy

2010

Review of Scientific Instruments

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Laser ion sources are used to generate and deliver highly charged ions of various masses and energies. We present details on the design and basic parameters of the DCU laser ion source ͑LIS͒. The theoretical aspects of a high voltage ͑HV͒ linear LIS are presented and the main issues surrounding laser-plasma formation, ion extraction and modeling of beam transport in relation to the operation of a LIS are detailed. A range of laser power densities ͑I ϳ 10 8 -10 11 W cm −2 ͒ and fluences ͑F = 0.1-3.9 kJ cm −2 ͒ from a Q-switched ruby laser ͑full-width half-maximum pulse duration ϳ35 ns, = 694 nm͒ were used to generate a copper plasma. In "basic operating mode," laser generated plasma ions are electrostatically accelerated using a dc HV bias ͑5-18 kV͒. A traditional einzel electrostatic lens system is utilized to transport and collimate the extracted ion beam for detection via a Faraday cup. Peak currents of up to I ϳ 600 A for Cu + to Cu 3+ ions were recorded. The maximum collected charge reached 94 pC ͑Cu 2+ ͒. Hydrodynamic simulations and ion probe diagnostics were used to study the plasma plume within the extraction gap. The system measured performance and electrodynamic simulations indicated that the use of a short field-free ͑L =48 mm͒ region results in rapid expansion of the injected ion beam in the drift tube. This severely limits the efficiency of the electrostatic lens system and consequently the sources performance. Simulations of ion beam dynamics in a "continuous einzel array" were performed and experimentally verified to counter the strong space-charge force present in the ion beam which results from plasma extraction close to the target surface. Ion beam acceleration and injection thus occur at "high pressure." In "enhanced operating mode," peak currents of 3.26 mA ͑Cu 2+ ͒ were recorded. The collected currents of more highly charged ions ͑Cu 4+ -Cu 6+ ͒ increased considerably in this mode of operation.

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“…1 This thin layer moves with a velocity larger than the local ion sound speed and results in formation of the shock. 31 The density of plasma plume follows a distribution 1 within the shock and causes a change in the refractive index. Following Eq.…”

Section: B Shadowgraphymentioning

confidence: 99%

Optical probe investigation of laser ablated carbon plasma plume in nitrogen ambient

Singh¹,

Gupta²,

Thareja³

2013

Physics of Plasmas

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We report the study of carbon plasma produced using 1064 nm laser in nitrogen ambient at atmospheric pressure using 2-dimensional fast imaging of ablated plume, optical emission spectroscopy, and optical probe at 532 nm for interferometry and shadowgraphy. The dominance of C 2 and CN molecules over ionic species at later stages of expanding carbon plasma plume is reported. The observed ring structure in shadowgrams and change in the direction of fringe shift from positive to negative in recorded interferograms are correlated with the relative abundance of different species in the plasma plume as function of time delay with respect to ablating pulse. An agreement in observed onset time of formation of clusters/atomic species or low ionic species using different diagnostic techniques has been reported. V C 2013 AIP Publishing LLC.

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Plume dynamics of laser-produced aluminum plasma in ambient nitrogen

Cited by 66 publications

References 26 publications

Emission features of femtosecond laser ablated carbon plasma in ambient helium

Emission features of femtosecond laser ablated carbon plasma in ambient helium

The DCU laser ion source

Optical probe investigation of laser ablated carbon plasma plume in nitrogen ambient

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