scholarly journals Effects of front surface plasma expansion on proton acceleration in ultraintense laser irradiation of foil targets

2008 ◽  
Vol 26 (4) ◽  
pp. 591-596 ◽  
Author(s):  
P. McKenna ◽  
D.C. Carroll ◽  
O. Lundh ◽  
F. Nürnberg ◽  
K. Markey ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Laser Irradiation ◽  
Proton Energy ◽  
Front Surface ◽  
Picosecond Laser ◽  
Thin Foil ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Maximum Energy ◽  
Incident Laser Pulse

AbstractThe properties of beams of high energy protons accelerated during ultraintense, picosecond laser-irradiation of thin foil targets are investigated as a function of preplasma expansion at the target front surface. Significant enhancement in the maximum proton energy and laser-to-proton energy conversion efficiency is observed at optimum preplasma density gradients, due to self-focusing of the incident laser pulse. For very long preplasma expansion, the propagating laser pulse is observed to filament, resulting in highly uniform proton beams, but with reduced flux and maximum energy.

scholarly journals High-energy picosecond laser pulse recirculation for compton scattering

2007 ◽  
Author(s):  
I. Jovanovic ◽  
S. G. Anderson ◽  
S. M. Betts ◽  
C. Brown ◽  
D. J. Gibson ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Compton Scattering ◽  
Picosecond Laser ◽  
High Energy ◽  
Picosecond Laser Pulse

scholarly journals Non-linear interaction of ultra-intense ultra-short laser pulse with a relativistic flying double-sided dense plasma slab/mirror

2014 ◽  
Vol 32 (2) ◽  
pp. 253-260 ◽  
Author(s):  
Vineeta Jain ◽  
K.P. Maheshwari ◽  
N.K. Jaiman ◽  
Harish Malav
Keyword(s):  
Laser Pulse ◽  
Electric Fields ◽  
Dense Plasma ◽  
Thin Foil ◽  
Density Parameter ◽  
Ion Dynamics ◽  
Reflection And Transmission ◽  
Linear Interaction ◽  
Incident Laser Pulse ◽  
Plasma Slab

AbstractAnalytical and numerical investigation of the reflection and transmission of a counter-propagating relativistically strong laser pulse from a relativistically flying dense plasma double-sided mirror is studied. We assume that the incident laser pulse is short, so that we can neglect the slow ion dynamics and consider the electron motion only. Numerical results of the amplitudes of the reflected/transmitted electric fields from a uniformly moving mirror, accelerated mirror, and oscillating mirror are obtained. Fourier spectrum of the reflected intensity from the moving mirror shows that the intensity decreases with increase in the frequency. The reflected pulse has an up-shifted frequency and increased intensity. It is seen that the first few cycles of the reflected radiation exhibit presence of high harmonics, while the later cycles are compressed together with harmonics in comparison with the earlier cycles. The variation of the reflection coefficient for a uniformly moving mirror as a function of the thin foil plasma-density parameter is numerically studied.

scholarly journals Tc-99m production with ultrashort intense laser pulses

2014 ◽  
Vol 32 (4) ◽  
pp. 605-611 ◽  
Author(s):  
V. Yu. Bychenkov ◽  
A. V. Brantov ◽  
G. Mourou
Keyword(s):  
Laser Pulse ◽  
Thin Foil ◽  
Laser Pulses ◽  
High Energy ◽  
Intense Laser ◽  
Pic Simulation ◽  
Intense Laser Pulses ◽  
Fs Laser ◽  
Proton Generation ◽  
Coherent Amplification

AbstractThe interaction of a relativistic short laser pulse with thin foil is studied using 3D PIC simulations in the context of optimized high-energy proton generation for nuclear medicine and pharmacy. As an example, we analyze the Tc-99m yield from the Mo-100(p,2n)Tc-99m reaction with the International Coherent Amplification Network (ICAN) concept defined by a 10 J pulse energy and 10 kHz repetition rate. Based on 3D PIC simulation it has been demonstrated that normally incident 100 fs laser pulse with maximum intensity of 5 × 1021 W/cm2 is able to generate 1011 protons with energy upto 45 MeV from thin semi-transparent CH2 target. Such laser-produced proton beam after 6 hours bombardment of the thick metallic Mo-100 target gives around 300 Gbq activities of Tc-99m isotope. This gives reason to believe that laser technology for producing technetium is possible with ICAN concept to replace the traditional scheme through the fission of weapons-grade uranium.

scholarly journals Generation of 100-J sub-picosecond laser pulse in high energy Nd:glass chirped pulse amplification system

2009 ◽  
Vol 58 (11) ◽  
pp. 7690
Author(s):  
Xie Xu-Dong ◽  
Zhu Qi-Hua ◽  
Zeng Xiao-Ming ◽  
Wang Xiao ◽  
Huang Xiao-Jun ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Picosecond Laser ◽  
High Energy ◽  
Picosecond Laser Pulse ◽  
Chirped Pulse ◽  
Pulse Amplification ◽  
Amplification System ◽  
Chirped Pulse Amplification

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 Relativistic laser propagation through underdense and overdense plasmas

2001 ◽  
Vol 19 (1) ◽  
pp. 5-13 ◽  
Author(s):  
O. WILLI ◽  
D.H. CAMPBELL ◽  
A. SCHIAVI ◽  
M. BORGHESI ◽  
M. GALIMBERTI ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Picosecond Laser ◽  
Thin Foil ◽  
Nanosecond Laser Pulse ◽  
Nanosecond Laser ◽  
Pulse Delay ◽  
X Ray ◽  
X Ray Imaging ◽  
Underdense Plasmas ◽  
Foil Target

Detailed investigations of the propagation of an ultraintense picosecond laser pulse through preformed plasmas have been carried out. An underdense plasma with peak density around 0.1nc was generated by exploding a thin foil target with an intense nanosecond laser pulse. The formation of plasma channels with an ultraintense laser pulse due to ponderomotive expulsion of elections and the subsequent Coulomb explosion were investigated. The laser transmission through underdense plasmas was measured for a picosecond pulse at intensities above 1019 W/cm2 with and without a plasma channel preformed with an ultraintense prepulse. The energy transmitted through the plasma increased from the few percent transmittance measured in absence of the preformed channel to almost 100% transmission with the channelling to main pulse delay at around 100 ps. The propagation of a relativistic laser pulse through overdense plasmas was also investigated. A well-characterized plasma with an electron density up to 8nc was generated by soft X-ray irradiation of a low-density foam target. The propagation of the laser pulse was observed via X-ray imaging and monitoring the energy transmission through the plasma. Evidence of collimated laser transport was obtained.

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