scholarly journals Comparison of femtosecond laser-driven proton acceleration using nanometer and micrometer thick target foils

2011 ◽  
Vol 29 (4) ◽  
pp. 437-446 ◽  
Author(s):  
M. Schnürer ◽  
A.A. Andreev ◽  
S. Steinke ◽  
T. Sokollik ◽  
T. Paasch-Colberg ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Record Values ◽  
Linear Increase ◽  
Thick Target ◽  
Intense Laser ◽  
Ion Acceleration ◽  
Target Area ◽  
Target Foil ◽  
Thin Foils ◽  
Ion Energies

AbstractAdvancement of ion acceleration by intense laser pulses is studied with ultra-thin nanometer-thick diamond like carbon and micrometer-thick Titanium target foils. Both investigations aim at optimizing the electron density distribution which is the key for efficient laser driven ion acceleration. While recently found maximum ion energies achieved with ultra-thin foils mark record values micrometer thick foils are flexible in terms of atomic constituents. Electron recirculation is one prerequisite for the validity of a very simple model that can approximate the dependence of ion energies of nanometer-thick targets when all electrons of the irradiated target area interact coherently with the laser pulse and Coherent Acceleration of Ions by Laser pulses (CAIL) becomes dominant. Complementary experiments, an analytical model and particle in cell computer simulations show, that with regard to ultra-short laser pulses (duration ~45 fs at intensities up to 5 × 1019 W/cm2) and a micrometer-thick target foil with higher atomic number a close to linear increase of ion energies manifests in a certain range of laser intensities.

Fast ion acceleration from thin foils irradiated by ultra-high intensity, ultra-high contrast laser pulses

2011 ◽  
Vol 99 (12) ◽  
pp. 121504 ◽  
Author(s):  
R. Prasad ◽  
A. A. Andreev ◽  
S. Ter-Avetisyan ◽  
D. Doria ◽  
K. E. Quinn ◽  
...  
Keyword(s):  
High Intensity ◽  
Laser Pulses ◽  
Ion Acceleration ◽  
High Contrast ◽  
Thin Foils ◽  
Fast Ion

Laser-Pulse Shaping in the Interaction of Ultra-Intense Laser Pulses with Ultra-Thin Foils

2012 ◽  
Vol 32 (7) ◽  
pp. 0714001
Author(s):  
邹德滨 Zou Debin ◽  
卓红斌 Zhuo Hongbin ◽  
邵福球 Shao Fuqiu ◽  
马燕云 Ma Yanyun ◽  
银燕 Yin Yan ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Pulse Shaping ◽  
Laser Pulses ◽  
Intense Laser ◽  
Thin Foils ◽  
Intense Laser Pulses ◽  
Laser Pulse Shaping

scholarly journals Diagnosis of peak laser intensity from high-energy ion measurements during intense laser interactions with underdense plasmas

2000 ◽  
Vol 18 (4) ◽  
pp. 595-600 ◽  
Author(s):  
K. KRUSHELNICK ◽  
E. CLARK ◽  
Z. NAJMUDIN ◽  
M. SALVATI ◽  
M.I.K. SANTALA ◽  
...  
Keyword(s):  
Laser Pulses ◽  
High Energy ◽  
Intense Laser ◽  
Power Laser ◽  
Laser Propagation ◽  
Spatially Resolved ◽  
Ion Energies ◽  
Underdense Plasmas ◽  
Ion Emission ◽  
Helium Neon

Experiments were performed using high-power laser pulses (greater than 50 TW) focused into underdense helium, neon, or deuterium plasmas (ne ≤ 5 × 1019 cm−3). Ions having energies greater than 300 keV were measured to be produced primarily at 90° to the axis of laser propagation. Ion energies greater than 6 MeV were recorded from interactions with neon. Spatially resolved pinhole images of the ion emission were also obtained and were used to estimate the intensity of the focused radiation in the interaction region.

scholarly journals Modeling of the electrostatic sheath shape on the rear target surface in short-pulse laser-driven proton acceleration

2006 ◽  
Vol 24 (1) ◽  
pp. 163-168 ◽  
Author(s):  
ERIK BRAMBRINK ◽  
MARKUS ROTH ◽  
ABEL BLAZEVIC ◽  
THEODOR SCHLEGEL
Keyword(s):  
Short Pulse ◽  
Target Surface ◽  
Laser Pulses ◽  
Target Thickness ◽  
Intense Laser ◽  
Rear Side ◽  
Proton Beams ◽  
Short Pulse Laser ◽  
Thin Foils ◽  
In The Beginning

Proton beams, generated in the interaction process of short ultra-intense laser pulses with thin foils, carry imprints of rear side target structures. These intensity patterns, imaged with a particle detector, sometimes show slight deformations. We propose an analytical model to describe these deformations by the spatial shape of a monoenergetic layer of protons in the beginning of free proton propagation. We also present results of simulations, which reproduce the detected structures and allow finally making quantitative conclusions on the shape of the layer. In experiments with electrically conducting targets, the shape is always close to a parabolic one independently on target thickness or laser parameters. Since the protons are pulled by the free electrons, there must be a strong correlation to the electron space charge distribution on the rear side of the illuminated foil. Simulations demonstrate that the deformations in the detected patterns of the proton layers are very sensitive to the initial layer shape. Analyzing spatial structures of the generated proton beams we can indirectly conclude on electron transport phenomena in the overdense part of the target.

scholarly journals Efficient ion acceleration by collective laser-driven electron dynamics with ultra-thin foil targets

2010 ◽  
Vol 28 (1) ◽  
pp. 215-221 ◽  
Author(s):  
S. Steinke ◽  
A. Henig ◽  
M. Schnürer ◽  
T. Sokollik ◽  
P.V. Nickles ◽  
...  
Keyword(s):  
Thin Foil ◽  
Laser Pulses ◽  
Maximum Energy ◽  
Skin Depth ◽  
Ion Acceleration ◽  
Carbon Ions ◽  
Incident Laser ◽  
Particle In Cell ◽  
Incident Laser Pulse ◽  
Ion Energies

AbstractExperiments on ion acceleration by irradiation of ultra-thin diamond-like carbon (DLC) foils, with thicknesses well below the skin depth, irradiated with laser pulses of ultra-high contrast and linear polarization, are presented. A maximum energy of 13 MeV for protons and 71 MeV for carbon ions is observed with a conversion efficiency of ~10%. Two-dimensional particle-in-cell (PIC) simulations reveal that the increase in ion energies can be attributed to a dominantly collective rather than thermal motion of the foil electrons, when the target becomes transparent for the incident laser pulse.

scholarly journals Enhanced ion acceleration by collisionless electrostatic shock in thin foils irradiated by ultraintense laser pulse

2009 ◽  
Vol 27 (2) ◽  
pp. 327-333 ◽  
Author(s):  
M.-P. Liu ◽  
B.-S. Xie ◽  
Y.-S. Huang ◽  
J. Liu ◽  
M.Y. Yu
Keyword(s):  
Laser Pulse ◽  
Target Surface ◽  
Hot Electrons ◽  
Intense Laser ◽  
Ion Acceleration ◽  
Particle In Cell ◽  
Thin Foils ◽  
Spatially Extended ◽  
Cell Simulation ◽  
Induced Transparency

AbstractThe formation of collisionless electrostatic shock (CES) and ion acceleration in thin foils irradiated by intense laser pulse is investigated using particle-in-cell simulation. The CES can appear in the expanding plasma behind the foil when self-induced transparency occurs. The transmitting laser pulse can expel target-interior electrons, in addition to the electrons from the front target surface. The additional hot electrons lead to an enhanced and spatially-extended sheath field behind the foil. As the CES propagates in the plasma, it also continuously forward-reflects many of the upstream ions to higher energies. The latter ions are further accelerated by the enhanced sheath field and can overtake and shield the target-normal sheath accelerated ions. The energy gain of the CES accelerated ions can thus be considerably higher than that of the latter.

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