Interaction of a ultra-high-intensity electromagnetic pulse with an overdense plasma

2008 ◽  
pp. 21-32
Author(s):  
Guy Bonnaud ◽  
Erik Lefebvre ◽  
Catherine Toupin
Keyword(s):  
High Intensity ◽  
Electromagnetic Pulse ◽  
Overdense Plasma

Nonlinear reflection of high intensity picosecond laser pulse from overdense plasma

1998 ◽  
Author(s):  
A. A. Andreev ◽  
V. I. Bayanov ◽  
A. B. Vankov ◽  
A. A. Kozlov ◽  
I. V. Kurnin ◽  
...  
Keyword(s):  
Laser Pulse ◽  
High Intensity ◽  
Picosecond Laser ◽  
Picosecond Laser Pulse ◽  
Nonlinear Reflection ◽  
Overdense Plasma

scholarly journals Studies of the interaction of an intense laser beam normally incident on an overdense plasma

2010 ◽  
Vol 28 (1) ◽  
pp. 129-147 ◽  
Author(s):  
Magdi Shoucri ◽  
Bedros Afeyan
Keyword(s):  
Laser Beam ◽  
Linear Polarization ◽  
High Intensity ◽  
Sharp Edge ◽  
Plasma Edge ◽  
Plasma Surface ◽  
Laser Wave ◽  
High Intensity Laser ◽  
Overdense Plasma ◽  
Intensity Laser

AbstractWe present two contrasting cases of the interaction of a high intensity laser beam with overdense plasma, namely the case of a circular polarization, and the case of a linear polarization of the laser beam. An Eulerian-Vlasov code is used for the numerical solution of the one-dimensional relativistic Vlasov-Maxwell set of equations, for both electrons and ions. The laser beam is incident normally on the plasma surface. We consider the case when the laser wave free space wavelength λ0 is greater than the scale length of the jump in the plasma density at the plasma edge Ledge (λ0 ≫ Ledge) and the ratio of the plasma density to the critical density is such that n/ncr ≫ 1. The incident high intensity laser radiation is pushing the electrons at the plasma surface through the ponderomotive pressure, producing a sharp density gradient at the plasma surface. There is a build-up of the electron density at this sharp edge that creates a space-charge, giving rise to a longitudinal electric field. The results obtained differ substantially in several aspects when circular or linear polarization for the incident laser wave is considered. In the case of a circular polarization, the radiation pressure is pushing the sharp edge in the forward direction, and the ions are accelerated and reach a free streaming expansion phase where they are neutralized by the electrons. For the case of a linear polarization, there is a standing structure with a sharp edge that forms at the wave front, and in this case, the electrons at the plasma edge oscillate nonlinearly in the field of the wave, which periodically goes to zero. This results in an important distorsion in the reflected electromagnetic wave that includes the generation of harmonics. We present two simulations to illustrate the differences between these two cases. The generation and propagation of collisionless shock waves in these systems are investigated. The results underline the importance of including the ion dynamics in the interaction of high intensity laser waves with overdense plasmas.

scholarly journals Single-cycle high-intensity electromagnetic pulse generation in the interaction of a plasma wakefield with regular nonlinear structures

2006 ◽  
Vol 73 (3) ◽  
Author(s):  
S. S. Bulanov ◽  
T. Zh. Esirkepov ◽  
F. F. Kamenets ◽  
F. Pegoraro
Keyword(s):  
High Intensity ◽  
Electromagnetic Pulse ◽  
Pulse Generation ◽  
Nonlinear Structures ◽  
Single Cycle ◽  
Plasma Wakefield

scholarly journals Shielding Performance of Materials Under the Excitation of High-Intensity Transient Electromagnetic Pulse

IEEE Access ◽  
2021 ◽  
Vol 9 ◽  
pp. 49697-49704
Author(s):  
Zhiyang Yan ◽  
Feng Qin ◽  
Jinliang Cai ◽  
Shouhong Zhong ◽  
Jiangchuan Lin
Keyword(s):  
High Intensity ◽  
Electromagnetic Pulse ◽  
Transient Electromagnetic

A New High Intensity Grid Cap for RCA-EMU-3 Electron Microscopes

1968 ◽  
Vol 26 ◽  
pp. 316-317
Author(s):  
George Christov ◽  
Bolivar J. Lloyd
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
High Voltage ◽  
High Intensity ◽  
Electron Gun ◽  
Tungsten Filament ◽  
Fluorescent Screen ◽  
Electron Microscopes ◽  
Pass Through ◽  
Ground Potential

A new high intensity grid cap has been designed for the RCA-EMU-3 electron microscope. Various parameters of the new grid cap were investigated to determine its characteristics. The increase in illumination produced provides ease of focusing on the fluorescent screen at magnifications from 1500 to 50,000 times using an accelerating voltage of 50 KV.The EMU-3 type electron gun assembly consists of a V-shaped tungsten filament for a cathode with a thin metal threaded cathode shield and an anode with a central aperture to permit the beam to course the length of the column. The cathode shield is negatively biased at a potential of several hundred volts with respect to the filament. The electron beam is formed by electrons emitted from the tip of the filament which pass through an aperture of 0.1 inch diameter in the cap and then it is accelerated by the negative high voltage through a 0.625 inch diameter aperture in the anode which is at ground potential.

260: High Intensity Focused Ultrasound Combined with Endocrine Therapy in Treating High or Intermediate Risk Prostate Cancer

2006 ◽  
Vol 175 (4S) ◽  
pp. 86-86
Author(s):  
Makoto Sumitomo ◽  
Junichi Asakuma ◽  
Yasumasa Hanawa ◽  
Kazuhiko Nagakura ◽  
Masamichi Hayakawa
Keyword(s):  
Prostate Cancer ◽  
Endocrine Therapy ◽  
High Intensity ◽  
Focused Ultrasound ◽  
High Intensity Focused Ultrasound ◽  
Intermediate Risk ◽  
Risk Prostate Cancer

1400: Early Clinical Experience Using High-Intensity Focused Ultrasound for the Treatment of Renal Tumours

2005 ◽  
Vol 173 (4S) ◽  
pp. 379-380
Author(s):  
James E. Kennedy ◽  
Rowland O. Illing ◽  
Feng Wu ◽  
Gail R. ter Haar ◽  
Rachel R. Phillips ◽  
...  
Keyword(s):  
Clinical Experience ◽  
High Intensity ◽  
Focused Ultrasound ◽  
High Intensity Focused Ultrasound ◽  
Early Clinical Experience ◽  
Renal Tumours

High-Intensity Focused Ultrasound

1994 ◽  
Vol 4 (2) ◽  
pp. 383-395 ◽  
Author(s):  
Narendra T. Sanghvi ◽  
Robert H. Hawes
Keyword(s):  
High Intensity ◽  
Focused Ultrasound ◽  
High Intensity Focused Ultrasound
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