Emission characteristics and stability of laser ion sources

Krása, J.; Velyhan, A.; Krouský, E.; Láska, L.; Rohlena, K.; Jungwirth, K.; Ullschmied, J.; Lorusso, A.; Velardi, L.; Nassisi, V.; Czarnecka, A.; Ryć, L.; Parys, P.; Wołowski, J.

doi:10.1016/j.vacuum.2010.08.021

Cited by 2 publications

(1 citation statement)

References 22 publications

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“…Nevertheless, the required shot-to-shot stability of ion emission is affected not only by the shot-to-shot reproducibility in the deposited laser intensity but also by nonlinear laser-matter interaction, which can result in stochastic behavior of the produced plasma. This phenomenon was observed in experiments on fast ion generation [1][2][3][4] when the focused laser intensity exceeds a threshold value of ∼3 × 10 14 W/cm 2 . Above this threshold, the ion emission shows irregularities caused by creation of plasma bursts 4 similar to the self-pulsing instability leading to chaos.…”

Section: Introductionmentioning

confidence: 69%

Shot-to-shot reproducibility in the emission of fast highly charged metal ions from a laser ion source

Krása

Velyhan

Margarone

et al. 2012

Review of Scientific Instruments

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The generation of fast highly charged metal ions with the use of the sub-nanosecond Prague Asterix Laser System, operated at a fundamental wavelength of 1315 nm, is reported. Particular attention is paid to shot-to-shot reproducibility in the ion emission. Au and Pd targets were exposed to intensities up to 5 × 10(16) W∕cm(2). Above the laser intensity threshold of ∼3 × 10(14) W∕cm(2) the plasma is generated in a form of irregular bursts. The maximum energy of protons constituting the leading edge of the fastest burst reaches a value up to 1 MeV. The fast ions in the following bursts have energy gradually decreasing with the increasing burst number, namely, from a value of about 0.5 MeV∕charge regardless of the atomic number and mass of the ionized species.

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Section: Introductionmentioning

confidence: 69%

Shot-to-shot reproducibility in the emission of fast highly charged metal ions from a laser ion source

Krása

Velyhan

Margarone

et al. 2012

Review of Scientific Instruments

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Ion emission from warm dense matter produced by irradiation with a soft x-ray free-electron laser

Krása,

Burian,

Hájková

et al. 2023

Matter and Radiation at Extremes

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We report on an experiment performed at the FLASH2 free-electron laser (FEL) aimed at producing warm dense matter via soft x-ray isochoric heating. In the experiment, we focus on study of the ions emitted during the soft x-ray ablation process using time-of-flight electron multipliers and a shifted Maxwell–Boltzmann velocity distribution model. We find that most emitted ions are thermal, but that some impurities chemisorbed on the target surface, such as protons, are accelerated by the electrostatic field created in the plasma by escaped electrons. The morphology of the complex crater structure indicates the presence of several ion groups with varying temperatures. We find that the ion sound velocity is controlled by the ion temperature and show how the ion yield depends on the FEL radiation attenuation length in different materials.

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Emission characteristics and stability of laser ion sources

Cited by 2 publications

References 22 publications

Shot-to-shot reproducibility in the emission of fast highly charged metal ions from a laser ion source

Shot-to-shot reproducibility in the emission of fast highly charged metal ions from a laser ion source

Ion emission from warm dense matter produced by irradiation with a soft x-ray free-electron laser

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