Generation of high currents of carbon ions with the use of subnanosecond near-infrared laser pulses

Krása, J.; Velyhan, A.; Margarone, D.; Krouský, E.; Ullschmied, J.; Skála, J.; Láska, L.; Jungwirth, K.; Rohlena, K.

doi:10.1063/1.3265317

Cited by 8 publications

(8 citation statements)

References 12 publications

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“…Such diamond detectors have been employed in time-of-flight (TOF) configuration to monitor the emission plasma obtained at PALS laboratory in Prague by using a laser pulse intensity of about 10 16 W/cm 2 .…”

Section: Resultsmentioning

confidence: 99%

“…Recently, the generation of ions with energy of few MeV/u and current densities of few A/cm 2 by the use of the subnanosecond, kJ-class laser at Prague Asterix Laser System (PALS) laboratory has been reported [1][2][3]. The beam parameters are estimated with application of various devices and techniques usually operated in "single shot" mode.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of laser-generated plasma ionizing radiation by synthetic single crystal diamond detectors

Marinelli

Milani

Prestopino

et al. 2013

Applied Surface Science

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a b s t r a c tDiamond based detectors have been used in order to analyze the ionizing radiation emitted from the laser-generated plasma. High energy proton/ion beams were generated at Prague Asterix Laser System (PALS) Centre by the sub-nanosecond kJ-class laser at intensities above 10 16 W/cm 2 . The tested detectors consisted of a photoconductive device based on high quality chemical vapor deposition (CVD) single crystal diamond, produced at Rome "Tor Vergata" University. They have been operated in planar configuration, having inter-digitized electrodes.The proposed diamond detectors were able to measure UV, X-rays, electrons and ions. They have been employed in time-of-flight (TOF) configuration and their reliability was checked by comparison with standard ion collectors (mostly used at PALS). Both the forward and backward expanding plasma was characterized in the experiment. The results indicate that diamond detectors are very promising for the characterization of fast proton and ion beams produced by high power laser systems.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of laser-generated plasma ionizing radiation by synthetic single crystal diamond detectors

Marinelli

Milani

Prestopino

et al. 2013

Applied Surface Science

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“…Placing the focus a few mm inside or in front of the target surface results in a larger irradiated area on surface, leading to higher ionization of carbon ions due to slower heat dissipation on a larger surface area during the plasma formation. 13 The dependence of ion yield on the position of the focal spot was discussed for MCI generation from Au, Pb, Ta, and C. 35,36 The larger laser spot area on target results in lower laser power density and, in general, lower ion charge state and energy. However, over a certain focal spot distance away from the target surface, the ion yield is increased due to the larger surface area ablated and the resulting larger volume of the laser plasma.…”

Section: Focal Point Dependencementioning

confidence: 99%

“…This is in agreement with previous results. 36 In Fig. 7, the EIA analyzer is set to allow ions with central energy-to-charge ratio of E/z = 5.3 keV which corresponds to the maximum of the ion energy distribution for the target biased at 9 kV.…”

Section: Focal Point Dependencementioning

confidence: 99%

Multicharged carbon ion generation from laser plasma

Balki

Elsayed-Ali

2016

Review of Scientific Instruments

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Carbon ions generated by ablation of a carbon target using an Nd:YAG laser pulse (wavelength λ = 1064 nm, pulse width τ = 7 ns, and laser fluence of 10-110 J cm) are characterized. Time-of-flight analyzer, a three-mesh retarding field analyzer, and an electrostatic ion energy analyzer are used to study the charge and energy of carbon ions generated by laser ablation. The dependencies of the ion signal on the laser fluence, laser focal point position relative to target surface, and the acceleration voltage are described. Up to C ions are observed. When no acceleration voltage is applied between the carbon target and a grounded mesh in front of the target, ion energies up to ∼400 eV/charge are observed. The time-of-flight signal is analyzed for different retarding field voltages in order to obtain the ion kinetic energy distribution. The ablation and Coulomb energies developed in the laser plasma are obtained from deconvolution of the ion time-of-flight signal. Deconvolution of the time-of-flight ion signal to resolve the contribution of each ion charge is accomplished using data from a retarding field analysis combined with the time-of-flight signal. The ion energy and charge state increase with the laser fluence. The position of the laser focal spot affects the ion generation, with focusing ∼1.9 mm in front of the target surface yielding maximum ions. When an external electric field is applied in an ion drift region between the target and a grounded mesh parallel to the target, fast ions are extracted and separated, in time, due to increased acceleration with charge state.

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“…The experiments recently performed at PALS facility in Prague have demonstrated that multi-MeV protons with current densities of ~A/cm 2 can be accelerated at modest laser intensities (~10 16 W/cm 2 ) by using a sub-nanosecondclass laser [5,6,7]. Nevertheless, the "standard" way of proton acceleration by using metallic targets, for instance, produces proton bunches which originate from the target surface contaminants (chemisorbed impurities containing hydrogen molecules).…”

Section: Introductionmentioning

confidence: 99%

Advanced target fabrication

Picciotto¹,

Mangione²,

Perin³

et al. 2013

AIP Conference Proceedings

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The report focuses on the microfabrication of advanced silicon and polymer targets for the application in the field of laser driven protons and particles acceleration. A particular attention is given to the fabrication technologies of the target materials and to their intrinsic physical and chemical characteristics with a special attention to their capability to store hydrogen atoms which can allow the production of high current, high energy protons beams. Results of experiments performed in the last few years are also discussed.

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Generation of high currents of carbon ions with the use of subnanosecond near-infrared laser pulses

Cited by 8 publications

References 12 publications

Analysis of laser-generated plasma ionizing radiation by synthetic single crystal diamond detectors

Analysis of laser-generated plasma ionizing radiation by synthetic single crystal diamond detectors

Multicharged carbon ion generation from laser plasma

Advanced target fabrication

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