Stimulated Raman scattering of beat wave of two counter-propagating X-mode lasers in a magnetized plasma
- Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida 201307, UP (India)
Effects of transverse static magnetic field on stimulated Raman scattering (SRS) of the beat wave excited by two counter-propagating lasers are studied. Two counter-propagating lasers with frequency difference, ω{sub 1}∼ω{sub 2}≥2ω{sub p}, drive a non resonant space charge beat mode at wave number k{sup →}{sub 0}≈k{sup →}{sub 1}+k{sup →}{sub 2} in a plasma, where k{sup →}{sub 1} and k{sup →}{sub 2} are wave vectors of lasers having frequencies ω{sub 1} and ω{sub 2}, respectively. The driven beat wave acts as a pump for SRS and excites parametrically a pair of plasma wave (ω,k{sup →}) and side band electromagnetic wave (ω{sub 3},k{sup →}{sub 3}) propagating in the sideward direction in such a way that momentum remains conserved. The growth rate of Raman process is maximum for side scattering at θ{sub s}=π/2 for lower values of applied magnetic field (∼1 kG), which can be three fold by applying magnetic field ∼5.0 kG. Thus, optimum value of magnetic field can be utilized to achieve maximum electron acceleration in counter propagating geometry of beat wave acceleration by reducing the growth rate of Raman process.
- OSTI ID:
- 22252097
- Journal Information:
- Physics of Plasmas, Vol. 21, Issue 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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