Angular distributions of ions emitted from laser plasma produced at various irradiation angles and laser intensities

Láska, L.; Jungwirth, K.; Krása, J.; Krouský, E.; Pfeifer, M.; Rohlena, K.; Velyhan, A.; Ullschmied, J.; Gammino, S.; Torrisi, L.; Badziak, J.; Parys, P.; Rosiński, M.; Ryć, L.; Wołowski, J.

doi:10.1017/s0263034608000591

Cited by 39 publications

(29 citation statements)

References 62 publications

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“…The three routes, viz., laser wakefield accelerator (Tazima & Dawson, 1979;Hogan et al, 2005;Robinson et al, 2006;Pukhov et al, 2004), the laser beat wave accelerator (Ebrahim, 1994;Liu & Tripathi, 1994;Prasad et al, 2009;Dyson & Dangor, 1991), and ponderomotive acceleration (Kawata et al, 2005;Andreev et al, 2009;Badziak et al, 2005;Kumar et al, 2006;Liu & Tripathi, 2005;Laska et al, 2008;Prasad et al, 2009) have been pursued vigorously and the electron acceleration approaching a GeV energy is being achieved. In these schemes, ponderomotive force plays the basic role, it can directly accelerate the electrons or excite a large amplitude plasma wave that can accelerate the electrons.…”

Section: Introductionmentioning

confidence: 99%

Relativistic self-distortion of a laser pulse and ponderomotive acceleration of electrons in an axially inhomogeneous plasma

2010

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Relativistic self distortion of a Gaussian laser pulse in inhomogeneous plasma in one dimension is investigated. The relativistic mass effect causes different portions of the pulse to travel with different group velocities leading to the steepening of the pulse front and broadening of the rear. This asymmetry created in the pulse shape gives rise to stronger ponderomotive force on electrons at the front and weaker at the rear. The fast moving electrons under this force are shown to have very significant net energy gain. The energy gain increases with the density scale-length and then saturates.

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Section: Introductionmentioning

confidence: 99%

Relativistic self-distortion of a laser pulse and ponderomotive acceleration of electrons in an axially inhomogeneous plasma

2010

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“…Laser induced plasma has an ability to produce ions with a broad spectrum of charges (even higher than 50+) and K.E from KeV to MeV range. 5 The thermal interactions, the adiabatic expansion in vacuum and coulombic interactions are responsible for primary ion acceleration. 6 The application of external magnetic field changes the plasma dynamics, results in the variation of density, velocity and temperature of plasma species.…”

Section: Introductionmentioning

confidence: 99%

Modifications in surface, structural and mechanical properties of brass using laser induced Ni plasma as an ion source

et al. 2016

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Laser induced Ni plasma has been employed as source of ion implantation for surface, structural and mechanical properties of brass. Excimer laser (248 nm, 20 ns, 120mJ and 30 Hz) was used for the generation of Ni plasma. Thomson parabola technique was employed to estimate the energy of generated ions using CR39 as a detector. In response to stepwise increase in number of laser pulses from 3000 to 12000, the ion dose varies from 60 × 1013 to 84 × 1016 ions/cm2 with constant energy of 138 KeV. SEM analysis reveals the growth of nano/micro sized cavities, pores, pits, voids and cracks for the ion dose ranging from 60 × 1013 to 70 × 1015 ions/cm2. However, at maximum ion dose of 84 × 1016 ions/cm2 the granular morphology is observed. XRD analysis reveals that new phase of CuZnNi (200) is formed in the brass substrate after ion implantation. However, an anomalous trend in peak intensity, crystallite size, dislocation line density and induced stresses is observed in response to the implantation with various doses. The increase in ion dose causes to decrease the Yield Stress (YS), Ultimate Tensile Strength (UTS) and hardness. However, for the maximum ion dose the highest values of these mechanical properties are achieved. The variations in the mechanical properties are correlated with surface and crystallographical changes of ion implanted brass.

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“…Laser based accelerators (Tajima et al, 1979;Baiwen et al, 2004;Giulietti et al, 2005;Kruer, 1988;Shi et al, 2007;Karmakar & Pukhov, 2007;Liu et al, 2009) and laser induced fusion (Canaud et al, 2004;Deutsch et al, 1996Deutsch et al, , 2008Regan et al, 1999;Hora, 2007;Imasaki & Li, 2008;Hong et al, 2009;Stancalie, 2009) using laser-plasma interaction (Hora & Hoffmann, 2008;Borghesi et al, 2007;Laska et al, 2008;Dromey et al, 2009;Hong et al, 2009;Kline et al, 2009;Kulagin et al, 2008;Malekynia et al, 2009;Nakamura et al, 2008;Sharma & Sharma, 2009) are attracting a lot of interest. The inertial fusion program requires the anomalous absorption of laser light by the plasma, whereas the plasma-based beat-wave accelerator concept relies on the radiation induced high phase velocity electron plasma (Langmuir) waves that can accelerate electrons to extremely high energies.…”

Section: Introductionmentioning

confidence: 99%

Generation of Longmuir turbulence and stochastic acceleration in laser beat wave process

Sharma¹,

Sharma

2010

Laser Part. Beams

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This paper investigates the filamentation process of two co-axially propagating laser beams in collisionless plasma. On account of the ponderomotive nonlinearity, two laser beams affect the dynamics of each other, and cross-focusing takes place. The initial Gaussian laser beams are found to have non-Gaussian structures in the plasma. Using the laser beam and the plasma parameters, appropriate for the beat wave process, the filaments of the laser beams have been studied. Using these results, the Langmuir wave excitation at the beat wave frequency (when the laser beams are having filamentary structures) has been studied. The excited LW is modeled with the help of a driven oscillator and it is found that the excited Langmuir wave is not a plane wave; rather it has a turbulent structure. We have obtained the power spectrum of the excited beat wave (Langmuir wave), and calculated the spectral index. The stochastic electron acceleration has been studied in the presence of this Langmuir turbulence and relevance of these results to the beat wave process has been pointed out.

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Angular distributions of ions emitted from laser plasma produced at various irradiation angles and laser intensities

Cited by 39 publications

References 62 publications

Relativistic self-distortion of a laser pulse and ponderomotive acceleration of electrons in an axially inhomogeneous plasma

Relativistic self-distortion of a laser pulse and ponderomotive acceleration of electrons in an axially inhomogeneous plasma

Modifications in surface, structural and mechanical properties of brass using laser induced Ni plasma as an ion source

Generation of Longmuir turbulence and stochastic acceleration in laser beat wave process

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