Ion expansion characteristics from a KrF-laser-produced plasma

Pd, Gupta; Yy, Tsui; Popil, R.; Fedosejevs, R.; Aa, Offenberger

doi:10.1103/physreva.33.3531

Cited by 13 publications

(7 citation statements)

References 23 publications

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“…The observed two peak behaviour can be qualitatively explained by considering lateral heat conduction in the plasma (Gupta et al 1986b). This becomes important for small focal spot irradiation conditions where the thermal diffusion length exceeds the focal spot dimensions Pert 1974).…”

Section: Ion Measurements Of Ablation Characteristicsmentioning

confidence: 88%

Experimental results for high intensity KrF laser/plasma interaction

et al. 1986

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A high power KrF laser system employing beam multiplexing and stimulated Raman or Brillouin scattering to produce pulses as short as 1 ns and focused intensities on target of 10 u to 10 14 W/cm 2 has been developed for laser/plasma interaction research. A variety of investigations have been pursued on single and multilayer targets with variable atomic numbers. Absorption, transport, X-ray conversion, ion expansion characteristics, mass ablation and ablation pressure scaling, and stimulated scattering instabilities are among features that have been studied as a function of laser intensity. A wide variety of laser and target diagnostics are employed including focal plane imaging cameras for energy distribution and UV and soft X-ray streak cameras for temporally resolving the incident laser pulse and X-ray emission. Experimental results will be presented and our current understanding of the KrF laser/plasma interaction will be discussed.

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Section: Ion Measurements Of Ablation Characteristicsmentioning

confidence: 88%

Experimental results for high intensity KrF laser/plasma interaction

et al. 1986

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“…In the case of C plasma, no two-peak behavior was observed. The two-peak behavior for Al plasma can be caused by three possible mechanisms: (1) lateral heat conduction in the plasma (Gupta et al 1986), (2) plasma ablation by X-ray radiation transport at a lower temperature than that caused by direct laser radiation, and (3) recombination kinetics in the expanding plasma. Further 1-and 2-D modeling studies are required to resolve this phenomena.…”

Section: Charge State Measurements Of a Krf Laser-produced Expanding mentioning

confidence: 99%

KrF laser-plasma interaction experiments with ns and ps pulses

et al. 1992

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We report on KrF laser-plasma interaction studies at focused intensities up to 4 x 10 14 W/cm 2 for pulse durations of 1-2 ns and up to 10 15 W/cm 2 for pulse duration of 100 ps. The longer-pulse experiments are concerned with quantifying two important features of the ablating plasma. Stimulated Brillouin scattering at moderately large L/X has been measured in detail as a function of intensity, target Z, and angle of incidence 0 to compare with modeling calculations of backscatter in inhomogeneous plasma. In addition, electrodynamic charge analyzer measurements have been made for varying intensity and target Z to compare with hydrodynamic calculations of ion expansion and recombination. In the shortpulse experiments, we report on X-ray conversion measurements for 100-ps laser-irradiated targets of varying Z at laser intensities of 1.5 X 10 14 and 10 15 W/cm 2 . In particular, it is shown that higher laser intensity leads to a substantial increase in X-ray conversion efficiency.

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“…The structure of the TOF signals shows the presence of fast and slow groups of ions, which is consistent with the various previously reported observations. [22][23][24] The maximum ion velocity ͑corre-sponding to the time when the ion TOF trace starts rising͒ and velocity corresponding to the peak of the TOF signals are measured to be ϳ1.05ϫ 10 8 cm/ s ͑energy of ϳ5.75 keV/ u͒ and 2.63ϫ 10 7 cm/ s ͑energy of ϳ0.36 keV/ u͒, respectively. These values are much smaller than those observed for ions generated in the cathode plasma jet of the spark discharge.…”

Section: -3mentioning

confidence: 99%

Fast ion generation in the cathode plasma jet of a multipicosecond laser-triggered vacuum discharge

Moorti

Naik

Gupta

2010

Review of Scientific Instruments

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Ion generation in the cathode plasma jet of a moderate-current (approximately 2.3 kA), low-energy (< or = 20 J) vacuum spark discharge triggered by approximately 27 ps, 10 mJ laser pulses is studied using time of flight technique. Fastest ion velocity and velocity corresponding to the peak of the time of flight signals for Al cathode were measured to be approximately 5.25x10(8) cm/s (energy of approximately 143 keV/u) and approximately 8.1x10(7) cm/s (energy of approximately 3.4 keV/u), respectively. Corresponding velocities in the case of ions generated from laser-produced Al plasma (energy of approximately 550 mJ, intensity of approximately 10(14) W/cm(2)) were found to be much smaller, viz., approximately 1.05x10(8) cm/s (energy of approximately 5.75 keV/u) and approximately 2.63x10(7) cm/s (energy of approximately 0.36 keV/u), respectively. Study shows efficient acceleration of ions in a current-carrying cathode plasma jet of a small-energy multipicosecond laser-triggered spark discharge as compared with that in a high-energy multipicosecond laser-produced plasma plume.

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Ion expansion characteristics from a KrF-laser-produced plasma

Cited by 13 publications

References 23 publications

Experimental results for high intensity KrF laser/plasma interaction

Experimental results for high intensity KrF laser/plasma interaction

KrF laser-plasma interaction experiments with ns and ps pulses

Fast ion generation in the cathode plasma jet of a multipicosecond laser-triggered vacuum discharge

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