TY - JOUR
T1 - Laser Amplification in Strongly Magnetized Plasma
AU - Edwards, Matthew R.
AU - Shi, Yuan
AU - Mikhailova, Julia M.
AU - Fisch, Nathaniel J.
N1 - Publisher Copyright:
© 2019 American Physical Society.
PY - 2019/7/9
Y1 - 2019/7/9
N2 - We consider backscattering of laser pulses in strongly magnetized plasma mediated by kinetic magnetohydrodynamic waves. Magnetized low-frequency (MLF) scattering, which can occur when the external magnetic field is neither perpendicular nor parallel to the laser propagation direction, provides an instability growth rate higher than Raman scattering and a frequency downshift comparable to Brillouin scattering. In addition to the high growth rate, which allows smaller plasmas, and the 0.1%-2% frequency downshift, which permits a wide range of pump sources, MLF scattering is an ideal candidate for amplification because the process supports an exceptionally large bandwidth, which particle-in-cell simulations show produces ultrashort durations. Under some conditions, MLF scattering also becomes the dominant spontaneous backscatter instability, with implications for magnetized laser-confinement experiments.
AB - We consider backscattering of laser pulses in strongly magnetized plasma mediated by kinetic magnetohydrodynamic waves. Magnetized low-frequency (MLF) scattering, which can occur when the external magnetic field is neither perpendicular nor parallel to the laser propagation direction, provides an instability growth rate higher than Raman scattering and a frequency downshift comparable to Brillouin scattering. In addition to the high growth rate, which allows smaller plasmas, and the 0.1%-2% frequency downshift, which permits a wide range of pump sources, MLF scattering is an ideal candidate for amplification because the process supports an exceptionally large bandwidth, which particle-in-cell simulations show produces ultrashort durations. Under some conditions, MLF scattering also becomes the dominant spontaneous backscatter instability, with implications for magnetized laser-confinement experiments.
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U2 - 10.1103/PhysRevLett.123.025001
DO - 10.1103/PhysRevLett.123.025001
M3 - Article
C2 - 31386488
AN - SCOPUS:85069787460
SN - 0031-9007
VL - 123
JO - Physical review letters
JF - Physical review letters
IS - 2
M1 - 025001
ER -