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- W2188312303 abstract "Stimulated Raman Scattering (S RS) is a threewave parametric instability in whic h an incident e lectromagnet ic wave is scattered in the presence of a plasma waveu. It is an important non-linear process in laser-produced plasmas and laser beatwave·1.4 and wakefield~ fi accelerators. In a laserproduced plasma, SRS can greatly reduce the efficiency of the incident laser by back-scattering. In the case of laser-driven fu sion, the large amplitude Langmuir wave, produced via SRS , produces hot elect rons which , in turn , can pre-heat the nuclear fuel, and cause its expansion thereby, adversely affecting fue l compress ion . In laser beat-wave and wakefie ld acce lerators, a large amplitude high-phase ve loc ity pl asma wave is generated by forward Raman scatteri ng. This plasma wave is employed to acce lerate charged particle. up to GeV of energies • In a ll these processes , the interact ion region betwee n laser and plasma is limited to a Rayl e igh length due to diffraction di vergence of the laser beam. Thi s limits the energy exchange between the wave and partic le. To ex tend the acce lerati on length for :t.ece lerators , optical guiding in a plasma has bee n proposed as a way of propagating a laser over ;everal Rayle igh lengthsx111 • With the use of hi gh Jower lasers, re lativi sti c effects become important. fhe electron near the beam ax is is larger than away from it. Consequently , the pl asma acquires a refractive index profile that acts as a waveguide for the laser 11 • • A plasma duct can also be produced by two-pul se technique. A laser pre-pul se produces a plasma and heats it. The hydrodynamic expansion of the plasma creates a plasma channel, with density minimum on its axis u. This plasma channe l acts as a waveguide for a second, delayed laser pul se and can be guided up to 70 Rayleigh l ength s 1 ~. Parashar et a/. 15 have studied the feasibility of suc h a plasxna channel for free e lectron laser (FEL) radiati on generation , at shorter wavelength by a millimeter wave. The latter gets Raman-back-scattered by a counter-propagating e lectron beam to produce FEL radiat ion." @default.
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- W2188312303 date "2003-01-01" @default.
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- W2188312303 title "NOTE Relativistic stimulated Raman scattering in a plasma channel" @default.
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