scholarly journals Observation of anomalous side-scattering in laser wakefield accelerators

2018 ◽  
Vol 36 (3) ◽  
pp. 391-395
Author(s):  
K. Krushelnick ◽  
A. E. Dangor ◽  
M. Kaluza ◽  
S. P. D. Mangles ◽  
C. D. Murphy ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Laser Plasma ◽  
Scattered Light ◽  
Laser Frequency ◽  
Acceleration Process ◽  
Laser Plasma Interaction ◽  
Spatially Resolved ◽  
Injection Process ◽  
Femtosecond Laser Plasma ◽  
Bubble Regime

AbstractHigh-intensity femtosecond laser–plasma interaction experiments were performed to investigate laser–plasma wakefield acceleration in the “bubble” regime. Using a 15 TW laser pulse, the emission of side-scattered radiation was spectrally and spatially resolved and was consequently used to diagnose the evolution of the laser pulse during the acceleration process. Side-scattered emission was observed immediately before wavebreaking at a frequency of ωL + 1.7ωp (where ωL is the laser frequency and ωp is the background plasma frequency). This emission may result from scattering of laser light by large amplitude plasma oscillations generated in the shell of the wakefield “bubble” and which occurs immediately prior to the wavebreaking/injection process. The observed variation of the frequency of scattered light with electron density agrees with theoretical estimates.

Laser–plasma interaction physics in underdense coronal plasmas

1986 ◽  
Vol 64 (8) ◽  
pp. 944-955 ◽  
Author(s):  
T. J. M. Boyd
Keyword(s):  
Laser Plasma ◽  
Stimulated Raman Scattering ◽  
Scattered Light ◽  
Critical Density ◽  
Emission Spectra ◽  
Laser Frequency ◽  
Finite Amplitude ◽  
Principal Characteristics ◽  
Laser Plasma Interaction ◽  
Laser Plasma Interactions

After a brief review of stimulated Raman scattering and two-plasmon decay, which dominate the physics of laser–plasma interactions at and below the quarter-critical density, we summarize some of the principal characteristics of emission from targets at half-harmonics of the laser frequency. Two mechanisms in particular are thought to contribute to the emission; Raman conversion and the direct linear conversion of plasmons generated by two-plasmon decay. Both processes are reviewed and the implications of each for the emission spectra examined.The effect of strong self-generated magnetic fields on harmonic generation is considered briefly and attention is drawn to ways in which the coincidence of interactions in the underdense plasma may influence their basic characteristics. A finite-amplitude ion wave, for example, modifies the spectrum of Raman scattered light, including significant frequency splitting.

Radiation produced by femtosecond laser–plasma interaction during dielectric breakdown

2005 ◽  
Vol 30 (6) ◽  
pp. 661 ◽  
Author(s):  
C. W. Carr ◽  
M. D. Feit ◽  
A. M. Rubenchik ◽  
P. De Mange ◽  
S. O. Kucheyev ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Plasma ◽  
Dielectric Breakdown ◽  
Plasma Interaction ◽  
Laser Plasma Interaction ◽  
Femtosecond Laser Plasma

Thermoelectric mechanism for self-generated magnetic field in femtosecond laser-plasma interaction

2013 ◽  
Vol 25 (7) ◽  
pp. 1709-1714
Author(s):  
阿不都热苏力 Abudurexiti A ◽  
帕孜来提 Pazilaiti A ◽  
帕力哈提 Mijit F
Keyword(s):  
Magnetic Field ◽  
Femtosecond Laser ◽  
Laser Plasma ◽  
Plasma Interaction ◽  
Laser Plasma Interaction ◽  
Femtosecond Laser Plasma

Femtosecond laser-plasma interaction with prepulse-generated liquid metal micro-jets

2012 ◽  
Author(s):  
D. S. Uryupina ◽  
K. A. Ivanov ◽  
A. V. Brantov ◽  
A. B. Savel’ev ◽  
V. Yu. Bychenkov ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Femtosecond Laser ◽  
Laser Plasma ◽  
Plasma Interaction ◽  
Laser Plasma Interaction ◽  
Femtosecond Laser Plasma

scholarly journals The effects of circularly polarized laser pulse on generated electron nano-bunches in oscillating mirror model

2014 ◽  
Vol 32 (2) ◽  
pp. 285-293 ◽  
Author(s):  
M. Shirozhan ◽  
M. Moshkelgosha ◽  
R. Sadighi-Bonabi
Keyword(s):  
Laser Pulse ◽  
Laser Plasma ◽  
Dense Plasma ◽  
Ponderomotive Force ◽  
Laser Pulses ◽  
Incident Laser ◽  
Circularly Polarized ◽  
Plasma Surface ◽  
Laser Plasma Interaction ◽  
Incident Laser Pulse

AbstractThe effects of the polarized incident laser pulse on the electrons of the plasma surface and on the reflected pulse in the relativistic laser-plasma interaction is investigated. Based on the relativistic oscillating mirror and totally reflecting oscillating mirror (TROM) regimes, the interaction of the intense polarized laser pulses with over-dense plasma is considered. Based on the effect of ponderomotive force on the characteristic of generated electron nano-bunches, considerable increasing in the localization and charges of nano-bunches are realized. It is found that the circularly polarized laser pulse have Ne/Ncr of 1500 which is almost two and seven times more than the amounts for P-polarized and S-polarized, respectively.

scholarly journals Generation of intense ultrashort midinfrared pulses by laser-plasma interaction in the bubble regime

2010 ◽  
Vol 82 (6) ◽  
Author(s):  
C.-H. Pai ◽  
Y.-Y. Chang ◽  
L.-C. Ha ◽  
Z.-H. Xie ◽  
M.-W. Lin ◽  
...  
Keyword(s):  
Laser Plasma ◽  
Plasma Interaction ◽  
Laser Plasma Interaction ◽  
Bubble Regime

scholarly journals Time-resolved study of holeboring in realistic experimental conditions

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
J. Hornung ◽  
Y. Zobus ◽  
S. Roeder ◽  
A. Kleinschmidt ◽  
D. Bertini ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Laser Plasma ◽  
Major Influence ◽  
Experimental Conditions ◽  
Time Resolved ◽  
Laser Plasma Interaction ◽  
Particle In Cell ◽  
Dense Plasmas ◽  
Laser Plasma Interactions ◽  
Overdense Plasma

AbstractThe evolution of dense plasmas prior to the arrival of the peak of the laser irradiation is critical to understanding relativistic laser plasma interactions. The spectral properties of a reflected laser pulse after the interaction with a plasma can be used to gain insights about the interaction itself, whereas the effect of holeboring has a predominant role. Here we developed an analytical model, describing the non-relativistic temporal evolution of the holeboring velocity in the presence of an arbitrary overdense plasma density and laser intensity profile. We verify this using two-dimensional particle-in-cell simulations, showing a major influence on the holeboring dynamic depending on the density profile. The influence on the reflected laser pulse has been verified during an experiment at the PHELIX laser. We show that this enables the possibility to determine the sub-micrometer scale length of the preplasma by measuring the maximum holeboring velocity and acceleration during the laser-plasma interaction.

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