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Title: Preliminary simulations or target plane irradiance with smoothing by spectral dispersion and with spherical and chromatic aberration from the Nova target chamber lens

Abstract

This paper contains the most recent simulations of smoothing-by-dispersion (SSD) of the time-integrated far field irradiance of the 2{omega} Nova beam when effects such as chromatic aberration and spherical aberration from the target focus lens are included. A realistic model for the 2{omega} Nova near field beam has been used. I have also simulated the smoothing effect of chromatic'' dispersion alone, and show that substantial smoothing can be achieved without the linear dispersion required in the full SSC appraoch. By comparison I also show the irradiance for a narrowband beam and compare the beam smoothness parameter -- {sigma}/I (i.e., the spatially averaged r.m.s. deviation in intensity from the local average), for the three cases. The simulations are in good agreement with our analysis of experimental data, except that the degree of beam smoothness predicted for chromatic smoothing is not as good as what we actually observed on Nova. The simulated beam images show features that are in qualitative agreement with our observations, such as the slightly tilted horizontal streaks'' in the SSD images and the radial'' going streaks with chromatic dispersion. The far field spatial Fourier spectrum is also generated by the code, and here again the results are inmore » qualitative agreement with the spatial Fourier analysis that we have done on our data so far.« less

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
5900743
Report Number(s):
UCRL-ID-108673
ON: DE92007276
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; LASER TARGETS; SIMULATION; PHOTON BEAMS; OPTICAL DISPERSION; CHROMATIC ABERRATIONS; DISPERSIONS; INERTIAL CONFINEMENT; LASER RADIATION; LENSES; NOVA FACILITY; STREAK CAMERAS; TARGET CHAMBERS; ACCELERATOR FACILITIES; BEAMS; CAMERAS; CONFINEMENT; ELECTROMAGNETIC RADIATION; MEASURING INSTRUMENTS; PLASMA CONFINEMENT; RADIATION DETECTORS; RADIATIONS; TARGETS; 700411* - Inertial Confinement Devices- (1992-)

Citation Formats

Henesian, M.A. Preliminary simulations or target plane irradiance with smoothing by spectral dispersion and with spherical and chromatic aberration from the Nova target chamber lens. United States: N. p., 1991. Web.
Henesian, M.A. Preliminary simulations or target plane irradiance with smoothing by spectral dispersion and with spherical and chromatic aberration from the Nova target chamber lens. United States.
Henesian, M.A. Fri . "Preliminary simulations or target plane irradiance with smoothing by spectral dispersion and with spherical and chromatic aberration from the Nova target chamber lens". United States.
@article{osti_5900743,
title = {Preliminary simulations or target plane irradiance with smoothing by spectral dispersion and with spherical and chromatic aberration from the Nova target chamber lens},
author = {Henesian, M.A.},
abstractNote = {This paper contains the most recent simulations of smoothing-by-dispersion (SSD) of the time-integrated far field irradiance of the 2{omega} Nova beam when effects such as chromatic aberration and spherical aberration from the target focus lens are included. A realistic model for the 2{omega} Nova near field beam has been used. I have also simulated the smoothing effect of chromatic'' dispersion alone, and show that substantial smoothing can be achieved without the linear dispersion required in the full SSC appraoch. By comparison I also show the irradiance for a narrowband beam and compare the beam smoothness parameter -- {sigma}/I (i.e., the spatially averaged r.m.s. deviation in intensity from the local average), for the three cases. The simulations are in good agreement with our analysis of experimental data, except that the degree of beam smoothness predicted for chromatic smoothing is not as good as what we actually observed on Nova. The simulated beam images show features that are in qualitative agreement with our observations, such as the slightly tilted horizontal streaks'' in the SSD images and the radial'' going streaks with chromatic dispersion. The far field spatial Fourier spectrum is also generated by the code, and here again the results are in qualitative agreement with the spatial Fourier analysis that we have done on our data so far.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {6}
}

Technical Report:
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