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Title: Inverse Bremsstrahlung Stabilization of Noise in the Generation of Ultra-short Intense Pulses by Backward Raman Amplification

Abstract

Inverse bremsstrahlung absorption of the pump laser beam in a backward Raman amplifier over the round-trip light transit time through the sub-critical density plasma can more than double the electron temperature of the plasma and produce time-varying axial temperature gradients. The resulting increased Landau damping of the plasma wave and detuning of the resonance can act to stabilize the pump against unwanted amplification of Langmuir noise without disrupting nonlinear amplification of the femtosecond seed pulse. Because the heating rate increases with the charge state Z, only low-Z plasmas (hydrogen, helium, or helium-hydrogen mixtures) will maintain a low enough temperature for efficient operation.

Authors:
; ; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., NJ (US)
Sponsoring Org.:
USDOE Office of Science (SC) (US)
OSTI Identifier:
820122
Report Number(s):
PPPL-3898
TRN: US0305709
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 6 Nov 2003
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; 25 ENERGY STORAGE; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLIFICATION; BATTERY CHARGE STATE; BREMSSTRAHLUNG; ELECTRON TEMPERATURE; HEATING RATE; HELIUM; HYDROGEN; LANDAU DAMPING; PLASMA WAVES; STABILIZATION; TEMPERATURE GRADIENTS; LASER-PLASMA INTERACTIONS; LASERS; PARAMAGNETIC INSTABILITIES

Citation Formats

Berger, Richard L, Clark Andrei Solodov, Daniel S, Valeo, Ernest J, and Fisch, Nathaniel J. Inverse Bremsstrahlung Stabilization of Noise in the Generation of Ultra-short Intense Pulses by Backward Raman Amplification. United States: N. p., 2003. Web. doi:10.2172/820122.
Berger, Richard L, Clark Andrei Solodov, Daniel S, Valeo, Ernest J, & Fisch, Nathaniel J. Inverse Bremsstrahlung Stabilization of Noise in the Generation of Ultra-short Intense Pulses by Backward Raman Amplification. United States. doi:10.2172/820122.
Berger, Richard L, Clark Andrei Solodov, Daniel S, Valeo, Ernest J, and Fisch, Nathaniel J. Thu . "Inverse Bremsstrahlung Stabilization of Noise in the Generation of Ultra-short Intense Pulses by Backward Raman Amplification". United States. doi:10.2172/820122. https://www.osti.gov/servlets/purl/820122.
@article{osti_820122,
title = {Inverse Bremsstrahlung Stabilization of Noise in the Generation of Ultra-short Intense Pulses by Backward Raman Amplification},
author = {Berger, Richard L and Clark Andrei Solodov, Daniel S and Valeo, Ernest J and Fisch, Nathaniel J},
abstractNote = {Inverse bremsstrahlung absorption of the pump laser beam in a backward Raman amplifier over the round-trip light transit time through the sub-critical density plasma can more than double the electron temperature of the plasma and produce time-varying axial temperature gradients. The resulting increased Landau damping of the plasma wave and detuning of the resonance can act to stabilize the pump against unwanted amplification of Langmuir noise without disrupting nonlinear amplification of the femtosecond seed pulse. Because the heating rate increases with the charge state Z, only low-Z plasmas (hydrogen, helium, or helium-hydrogen mixtures) will maintain a low enough temperature for efficient operation.},
doi = {10.2172/820122},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {11}
}