Formation of a shock wave structure under conditions of expansion of a laser plasma in a low-density gas

Ананьин, О. Б.; Bykovskiĭ, Yu A; Stupitskii, E. L.; Khudaverdyan, A M

doi:10.1070/qe1987v017n11abeh010953

Cited by 8 publications

(3 citation statements)

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“…Only the expansion of silicon in noble gases [7,8] and aluminum in O 2 [9] and N 2 [10] were modeled over wide pressure ranges. A scattering formalism [7,11] is appropriate to describe the complex plume dynamics, in particular when splitting is observed at specific distances and pressures, yet simpler hydrodynamic models retain their validity at the expense of a less accurate description of plume propagation [12][13][14]. The relation between ablated mass per pulse (M P ) and gas mass is a critical parameter that severely affects the different plasma expansion regimes and the corresponding plasma-gas energy exchange [15][16][17].…”

mentioning

confidence: 99%

On the role of the ablated mass on the propagation of a laser-generated plasma in an ambient gas

Spadaro¹,

Fazio²,

Neri³

et al. 2015

EPL

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We investigate the influence of the ablated mass on the dynamics of a laser-generated plasma expanding in an ambient gas. A laser-generated silver plasma expanding in argon was analysed by fast photo imaging. While keeping all relevant experimental parameters fixed, we changed the ablated mass per pulse, by changing the laser spot area at the target surface. We show that at fixed laser fluence, plasma dynamics undergoes dramatic changes as a function of the ablated mass per pulse. Plasma expansion dynamics is studied using drag, v 2 -drag, mixed propagation and Predtechensky-Mayorov models. Results show that, at a given laser fluence, when a shock wave forms, plasma dynamics is unequivocally determined by the ratio between the ablated mass per pulse and the gas density. Such a dynamics critically affects the kinetic energy at landing and the nanostructure resulting upon mutual assembling on the substrate of the deposited nanoparticles. Thus both the ablated mass per pulse and the laser fluence are to be known to control the nanostructure formation.

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mentioning

confidence: 99%

On the role of the ablated mass on the propagation of a laser-generated plasma in an ambient gas

Spadaro¹,

Fazio²,

Neri³

et al. 2015

EPL

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“…22 The voltage spike was followed by a fairly constant voltage plateau and a slow current rise which corresponds to a matched-load operation with a ''slow'' change of the AC gap due to the plasma motion across magnetic field. These values are estimated to be (2 -3) j CL .…”

Section: Ib Ballistic Focusingmentioning

confidence: 99%

Generation and transport of a low energy intense ion beam

Bystritskiǐ

Garate

Rostoker

et al. 2004

Journal of Applied Physics

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The paper describes experiments on the generation and transport of a low energy (70–120 keV), high intensity (10–30 A/cm2) microsecond duration H+ ion beam (IB) in vacuum and plasma. The IB was generated in a magnetically insulated diode (MID) with an applied radial B field and an active hydrogen-puff ion source. The annular IB, with an initial density of ji∼10–20 A/cm2 at the anode surface, was ballistically focused to a current density in the focal plane of 50–80 A/cm2. The postcathode collimation and transport of the converging IB were provided by the combination of a “concave” toroidal magnetic lens followed by a straight transport solenoid section. With optimized MID parameters and magnetic fields in the lens/solenoid system, the overall efficiency of IB transport at the exit of the solenoid 1 m from the anode was ∼ 50% with an IB current density of 20 A/cm2. Two-dimensional computer simulations of post-MID IB transport supported the optimization of system parameters.

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“…In a typical pulse, the MID current wave form has a short duration spike of a few tens of nanoseconds, due to the fast erosion of the low density plasma already present in the AC gap, and the voltage pulse front had an overshooting spike typical for a plasma erosion switch operation. 22 The voltage spike was followed by a fairly constant voltage plateau and a slow current rise which corresponds to a matched-load operation with a ''slow'' change of the AC gap due to the plasma motion across magnetic field. The speed of the plasma motion was estimated to be (0.2-0.5)ϫ10 6 cm/s with a B field of (2 -3)B cr based on the pulse duration up to the shorting when operating without the crowbar.…”

Section: Ib Ballistic Focusingmentioning

confidence: 99%

Generation and transport of a low energy intense ion beam

Bystritskii

Garate

Qerushi

et al.

Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472)

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The paper describes experiments on the generation and transport of a low energy ͑70-120 keV͒, high intensity ͑10-30 A/cm 2 ͒ microsecond duration H ϩ ion beam ͑IB͒ in vacuum and plasma. The IB was generated in a magnetically insulated diode ͑MID͒ with an applied radial B field and an active hydrogen-puff ion source. The annular IB, with an initial density of j i ϳ10-20 A/cm 2 at the anode surface, was ballistically focused to a current density in the focal plane of 50-80 A/cm 2. The postcathode collimation and transport of the converging IB were provided by the combination of a ''concave'' toroidal magnetic lens followed by a straight transport solenoid section. With optimized MID parameters and magnetic fields in the lens/solenoid system, the overall efficiency of IB transport at the exit of the solenoid 1 m from the anode was ϳ 50% with an IB current density of 20 A/cm 2. Two-dimensional computer simulations of post-MID IB transport supported the optimization of system parameters.

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Formation of a shock wave structure under conditions of expansion of a laser plasma in a low-density gas

Cited by 8 publications

References 0 publications

On the role of the ablated mass on the propagation of a laser-generated plasma in an ambient gas

On the role of the ablated mass on the propagation of a laser-generated plasma in an ambient gas

Generation and transport of a low energy intense ion beam

Generation and transport of a low energy intense ion beam

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