scholarly journals Protons and ion acceleration from thick targets at 1010 W/cm2 laser pulse intensity

2010 ◽  
Vol 29 (1) ◽  
pp. 29-37 ◽  
Author(s):  
L. Torrisi ◽  
F. Caridi ◽  
L. Giuffrida
Keyword(s):  
Laser Pulse ◽  
Relative Yield ◽  
Ion Acceleration ◽  
Energy Analyzer ◽  
Ion Energy ◽  
Laser Absorption ◽  
Pulse Intensity ◽  
Laser Pulse Intensity ◽  
Emission Yield ◽  
Ion Emission

AbstractProton ion acceleration via laser-generated plasma is investigated at relatively low laser pulse intensity, on the order of 1010 W/cm2. Time-of-flight technique is employed to measure the ion energy and the relative yield. An ion collector and an ion energy analyzer are used with this aim and to distinguish the number of charge states of the produced ions. The kinetic energy and the emission yield are measured through a consolidated theory, which assumes that the ion emission follows the Coulomb-Boltzmann-Shifted function. The proton stream is generated by thin and thick hydrogenated targets and it is dependent on the free electron states, which increase the laser absorption coefficient and the ion acceleration. The maximum proton energy, of about 200 eV, and the maximum proton amount can be obtained with thick metallic hydrogenated materials, such as the titanium hydrate TiH2.

Laser Evaporative Heating: Influence of Laser Pulse Intensity on the Cavity Formation

2008 ◽  
Vol 29 (3) ◽  
pp. 328-339 ◽  
Author(s):  
S. B. Mansoor ◽  
B. S. Yilbas ◽  
S. Z. Shuja
Keyword(s):  
Laser Pulse ◽  
Cavity Formation ◽  
Pulse Intensity ◽  
Laser Pulse Intensity

High pressure SF6 pulse transmission near 10.4 μm

1977 ◽  
Vol 55 (22) ◽  
pp. 1956-1961 ◽  
Author(s):  
E. A. Ballik ◽  
B. K. Garside ◽  
R. S. Taylor ◽  
T. A. Znotins
Keyword(s):  
High Pressure ◽  
Absorption Spectrum ◽  
Laser Pulse ◽  
Laser Pulses ◽  
Transmission Characteristics ◽  
Dynamical Characteristics ◽  
Pulse Intensity ◽  
Pulse Transmission ◽  
Laser Pulse Intensity

Measurements were performed to determine the dynamical characteristics of high pressure SF6 absorption at the 10.4 μm band of CO2 as a function of laser pulse intensity. Both long (~ 200 ns FWHM) and short (~ 5 ns FWHM) CO2 laser pulses were employed. The observed pulse transmission characteristics can be accounted for using a vibrational bath model, which allows for the very large number of levels in the absorption spectrum of SF6.

scholarly journals Corpuscular diagnostics and processing methods applied in investigations of laser-produced plasma as a source of highly ionized ions

1996 ◽  
Vol 14 (3) ◽  
pp. 293-321 ◽  
Author(s):  
E. Woryna ◽  
P. Parys ◽  
J. Wołowski ◽  
W. Mróz†
Keyword(s):  
Experimental Data ◽  
Electron Emission ◽  
Secondary Electron ◽  
Neutral Atom ◽  
Secondary Electron Emission ◽  
Energy Analyzer ◽  
Ion Energy ◽  
Laser Produced Plasma ◽  
Corpuscular Diagnostics ◽  
Ion Emission

This paper presents a set of complementary corpuscular diagnostics applied in experiments for investigation of laser-produced plasma as a source of ions. The measuring possibilities and methods for processing experimental data of a cylindrical electrostatic ion energy analyzer, a Thomson parabola ion analyzer, various types of electrostatic probes, a detector of neutral atom fluxes, as well as methods for visualization of ion emission areas are discussed. Special attention was focused on the ion-induced secondary electron emission problem and its influence on the accuracy of the measurements.

scholarly journals Modeling the ultra-high intensity laser pulse – cone target interaction for ion acceleration at CETAL facility

2017 ◽  
Vol 35 (3) ◽  
pp. 458-466 ◽  
Author(s):  
O. Budrigă ◽  
E. D'Humières
Keyword(s):  
Laser Pulse ◽  
High Intensity ◽  
Numerical Study ◽  
Maximum Energy ◽  
Ion Acceleration ◽  
Target Interaction ◽  
Laser Absorption ◽  
High Intensity Laser ◽  
Cone Target ◽  
Intensity Laser

AbstractWe study the interaction of an ultra-high intensity laser pulse with plastic flat-top cone targets with curved walls and cone targets with straight walls. We find the appropriate type, dimensions of the cone target, and the ultra-high intensity laser pulse parameters for which the accelerated ions have the maximum energy and their number is the highest for a lower angular divergence and a better laser absorption. This numerical study will allow one to prepare and optimize first laser-ion acceleration experiments on CETAL using micro-cone targets.

scholarly journals Angular distributions of ions from laser-produced plasma

1999 ◽  
Vol 17 (2) ◽  
pp. 307-312 ◽  
Author(s):  
E. WORYNA ◽  
P. PARYS ◽  
J. WOŁOWSKI ◽  
J. KRÁSA ◽  
L. LÁSKA ◽  
...  
Keyword(s):  
Group Velocity ◽  
Laser Energy ◽  
Laser System ◽  
Angular Distributions ◽  
Energy Analyzer ◽  
Ion Energy ◽  
Preferred Direction ◽  
Maximum Charge ◽  
Ion Emission ◽  
Fast Ion

This paper presents comprehensive experimental results of angular distributions of ions emitted from laser-produced plasmas. Performing a series of laser shots onto planar Sn, Au, and Pb targets, both the focusing conditions as well as the tilt angle of the target were changed to study the effect on the plasma expansion. In the experiments, the iodine laser system PERUN (laser energy of 30 J in 350 ps of duration) with laser power density of 5 × 1014 W/cm2 was used. For plasma diagnostics four ion collectors and an ion-energy analyzer were applied. Comparison of angular distribution of the fast ion group (velocity within the range of 1–3.4 × 108 cm/s) and of the slow ion group (velocity within the range of 0.14–1 × 108 cm/s) shows distinct differences. The preferred direction of ion emission of these groups depends seriously on focusing conditions. When setting the focus on the in-focus position both groups of ions are peaked in the direction close to the target normal. The maximum charge of ions registered by the ion-energy analyzer were 36+, 51+, and 49+ for Sn, Au, and Pb, respectively.

Effect of two-color laser pulse intensity ratio on intense terahertz generation

RSC Advances ◽  
2015 ◽  
Vol 5 (2) ◽  
pp. 1485-1490 ◽  
Author(s):  
Chenhui Lu ◽  
Shian Zhang ◽  
Yunhua Yao ◽  
Shuwu Xu ◽  
Tianqing Jia ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Laser Field ◽  
Intensity Ratio ◽  
Terahertz Generation ◽  
Transient Photocurrent ◽  
Pulse Intensity ◽  
Laser Pulse Intensity

We theoretically demonstrate the effect of the intensity ratio of the two-color laser field on the terahertz generation based on a transient photocurrent model.

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