scholarly journals Double layer acceleration by laser radiation

2014 ◽  
Vol 32 (2) ◽  
pp. 211-216 ◽  
Author(s):  
Shalom Eliezer ◽  
Noaz Nissim ◽  
José Maria Martínez Val ◽  
Kunioki Mima ◽  
Heinrich Hora
Keyword(s):  
Laser Radiation ◽  
Pulse Duration ◽  
Double Layer ◽  
Radiation Pressure ◽  
Ponderomotive Force ◽  
Acceleration Process ◽  
Laser Target ◽  
Target Interaction ◽  
Rayleigh Taylor Instability ◽  
Rt Instability

AbstractIt is shown that it is possible to accelerate micro-foils to velocities from 108 cm/s up to relativistic velocities without the disturbance of the Rayleigh-Taylor instability. The acceleration occurs due to the radiation pressure of proper high power lasers. In these systems, the ablation force is negligible relative to the ponderomotive force that dominates the acceleration. The laser irradiances of 1017 W/cm2 < IL < 1021 W/cm2 with a pulse duration of the order of 10 picoseconds can accelerate a micro-foil by the laser radiation pressure to velocities as high as 109 cm/s before breaking by Rayleigh Taylor (RT) instability. Similarly, laser irradiances of IL > 1021 W/cm2 with pulse duration of the order of 10 femtoseconds can accelerate a micro-foil to relativistic velocities without RT breaking. Due to the nature of the accelerating ponderomotive force, in both the relativistic and non-relativistic cases, the structure of the accelerated target contains a double layer (DL) at the interface of the laser-target interaction. The DL acts as a piston during the acceleration process. The influence of the DL surface tension on the RT instability is also analyzed in this paper.

INTERFEROMETRIC MEASUREMENTS OF DENSITY PROFILES IN LASER-TARGET INTERACTION

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-767-C7-768
Author(s):  
R. Benattar ◽  
C. Popovics ◽  
R. Sigel ◽  
J. Virmont
Keyword(s):  
Laser Target ◽  
Density Profiles ◽  
Target Interaction

scholarly journals A new upper bound for the largest growth rate of linear Rayleigh–Taylor instability

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Changsheng Dou ◽  
Jialiang Wang ◽  
Weiwei Wang
Keyword(s):  
Surface Tension ◽  
Growth Rate ◽  
Upper Bound ◽  
Viscous Fluids ◽  
Instability Condition ◽  
Interface Surface ◽  
Incompressible Viscous Fluids ◽  
Rayleigh Taylor Instability ◽  
Surface Tensor ◽  
Rt Instability

AbstractWe investigate the effect of (interface) surface tensor on the linear Rayleigh–Taylor (RT) instability in stratified incompressible viscous fluids. The existence of linear RT instability solutions with largest growth rate Λ is proved under the instability condition (i.e., the surface tension coefficient ϑ is less than a threshold $\vartheta _{\mathrm{c}}$ ϑ c ) by the modified variational method of PDEs. Moreover, we find a new upper bound for Λ. In particular, we directly observe from the upper bound that Λ decreasingly converges to zero as ϑ goes from zero to the threshold $\vartheta _{\mathrm{c}}$ ϑ c .

scholarly journals THE MANIPULATING OF SiO2 AND MODIFIED SiO2 PARTICLES IN ATMOSPHERE BY LASER RADIATION PRESSURE

1991 ◽  
Vol 7 (Supple) ◽  
pp. 679-681
Author(s):  
TOSHIYUKI YAMAMOTO ◽  
TOHRU FUJII ◽  
TOMOKO MATSUI ◽  
TSUGUO SAWADA
Keyword(s):  
Laser Radiation ◽  
Radiation Pressure ◽  
Sio2 Particles

Stable radiation pressure acceleration of ions by suppressing transverse Rayleigh-Taylor instability with multiple Gaussian pulses

2016 ◽  
Vol 23 (8) ◽  
pp. 083109 ◽  
Author(s):  
M. L. Zhou ◽  
B. Liu ◽  
R. H. Hu ◽  
Y. R. Shou ◽  
C. Lin ◽  
...  
Keyword(s):  
Radiation Pressure ◽  
Taylor Instability ◽  
Rayleigh Taylor Instability

scholarly journals Ion Acceleration in Multispecies Targets Driven by Intense Laser Radiation Pressure

2012 ◽  
Vol 109 (18) ◽  
Author(s):  
S. Kar ◽  
K. F. Kakolee ◽  
B. Qiao ◽  
A. Macchi ◽  
M. Cerchez ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Radiation Pressure ◽  
Intense Laser ◽  
Ion Acceleration ◽  
Intense Laser Radiation

A Turbulent Heliosheath Driven by Rayleigh Taylor Instability

2021 ◽  
Author(s):  
Merav Opher ◽  
James Drake ◽  
Gary Zank ◽  
Gabor Toth ◽  
Erick Powell ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Large Scale ◽  
Neutral Atom ◽  
Solar Magnetic Field ◽  
Characteristic Time Scale ◽  
Rayleigh Taylor Instability ◽  
Scale Turbulence ◽  
Magnetohydrodynamic Simulations ◽  
Rt Instability

Abstract The heliosphere is the bubble formed by the solar wind as it interacts with the interstellar medium (ISM). Studies show that the solar magnetic field funnels the heliosheath solar wind (the shocked solar wind at the edge of the heliosphere) into two jet-like structures1-2. Magnetohydrodynamic simulations show that these heliospheric jets become unstable as they move down the heliotail1,3 and drive large-scale turbulence. However, the mechanism that produces of this turbulence had not been identified. Here we show that the driver of the turbulence is the Rayleigh-Taylor (RT) instability caused by the interaction of neutral H atoms streaming from the ISM with the ionized matter in the heliosheath (HS). The drag between the neutral and ionized matter acts as an effective gravity which causes a RT instability to develop along the axis of the HS magnetic field. A density gradient exists perpendicular to this axis due to the confinement of the solar wind by the solar magnetic field. The characteristic time scale of the instability depends on the neutral H density in the ISM and for typical values the growth rate is ~ 3 years. The instability destroys the coherence of the heliospheric jets and magnetic reconnection ensues, allowing ISM material to penetrate the heliospheric tail. Signatures of this instability should be observable in Energetic Neutral Atom (ENA) maps from future missions such as IMAP4. The turbulence driven by the instability is macroscopic and potentially has important implications for particle acceleration.

scholarly journals Monoenergetic proton beam accelerated by single reflection mechanism only during hole-boring stage

2019 ◽  
Vol 7 ◽  
Author(s):  
Wenpeng Wang ◽  
Cheng Jiang ◽  
Shasha Li ◽  
Hao Dong ◽  
Baifei Shen ◽  
...  
Keyword(s):  
Proton Beam ◽  
Radiation Pressure ◽  
Proton Therapy ◽  
Beam Quality ◽  
Acceleration Process ◽  
Carbon Ions ◽  
Triple Layer ◽  
Rear Part ◽  
Beam Instabilities ◽  
Sharp Front

Multidimensional instabilities always develop with time during the process of radiation pressure acceleration, and are detrimental to the generation of monoenergetic proton beams. In this paper, a sharp-front laser is proposed to irradiate a triple-layer target (the proton layer is set between two carbon ion layers) and studied in theory and simulations. It is found that the thin proton layer can be accelerated once to hundreds of MeV with monoenergetic spectra only during the hole-boring (HB) stage. The carbon ions move behind the proton layer in the light-sail (LS) stage, which can shield any further interaction between the rear part of the laser and the proton layer. In this way, proton beam instabilities can be reduced to a certain extent during the entire acceleration process. It is hoped such a mechanism can provide a feasible way to improve the beam quality for proton therapy and other applications.

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