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Title: Progress in Long Scale Length Laser-Plasma Interactions

Abstract

The first experiments on the National Ignition Facility (NIF) have employed the first four beams to measure propagation and laser backscattering losses in large ignition-size plasmas. Gas-filled targets between 2 mm and 7 mm length have been heated from one side by overlapping the focal spots of the four beams from one quad operated at 351 nm (3{omega}) with a total intensity of 2 x 10{sup 15} W cm{sup -2}. The targets were filled with 1 atm of CO{sub 2} producing of up to 7 mm long homogeneously heated plasmas with densities of n{sub e} = 6 x 10{sup 20} cm{sup -3} and temperatures of T{sub e} = 2 keV. The high energy in a NIF quad of beams of 16kJ, illuminating the target from one direction, creates unique conditions for the study of laser plasma interactions at scale lengths not previously accessible. The propagation through the large-scale plasma was measured with a gated x-ray imager that was filtered for 3.5 keV x rays. These data indicate that the beams interact with the full length of this ignition-scale plasma during the last {approx}1 ns of the experiment. During that time, the full aperture measurements of the stimulated Brillouin scattering andmore » stimulated Raman scattering show scattering into the four focusing lenses of 6% for the smallest length ({approx}2 mm). increasing to 12% for {approx}7 mm. These results demonstrate the NIF experimental capabilities and further provide a benchmark for three-dimensional modeling of the laser-plasma interactions at ignition-size scale lengths.« less

Authors:
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Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
15006528
Report Number(s):
UCRL-CONF-155301
TRN: US0400846
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Third International Conference on Inertial Fusion Sciences and Applications, Monterey, CA (US), 09/07/2003--09/12/2003; Other Information: PBD: 11 Nov 2003
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; APERTURES; BACKSCATTERING; BENCHMARKS; BRILLOUIN EFFECT; FOCUSING; LASERS; LENSES; PLASMA; SCATTERING; SIMULATION; TARGETS; US NATIONAL IGNITION FACILITY

Citation Formats

Glenzer, S H, Arnold, P, Bardsley, G, Berger, R L, Bonanno, G, Borger, T, Bower, D E, Bowers, M, Bryant, R, Buckman, S, Burkhart, S C, Campbell, K, Chrisp, M P, Cohen, B I, Constantin, G, Cooper, F, Cox, J, Dewald, E, Divol, L, Dixit, S, Duncan, J, Eder, D, Edwards, J, Erbert, G, Felker, B, Fornes, J, Frieders, G, Froula, D H, Gardner, S D, Gates, C, Gonzalez, M, Grace, S, Gregori, G, Greenwood, A, Griffith, R, Hall, T, Hammel, B A, Haynam, C, Heestand, G, Henesian, M, Hermes, G, Hinkel, D, Holder, J, Holdner, F, Holtmeier, G, Hsing, W, Huber, S, James, T, Johnson, S, Jones, O S, Kalantar, D, Kamperschroer, J H, Kauffman, R, Kelleher, T, Knight, J, Kirkwood, R K, Kruer, W L, Labiak, W, Landen, O L, Langdon, A B, Langer, S, Latray, D, Lee, A, Lee, F D, Lund, D, MacGowan, B, Marshall, S, McBride, J, McCarville, T, McGrew, L, Mackinnon, A J, Mahavandi, S, Manes, K, Marshall, C, Mertens, E, Meezan, N, Miller, G, Montelongo, S, Moody, J D, Moses, E, Munro, D, Murray, J, Neumann, J, Newton, M, Ng, E, Niemann, C, Nikitin, A, Opsahl, P, Padilla, E, Parham, T, Parrish, G, Petty, C, Polk, M, Powell, C, Reinbachs, I, Rekow, V, Rinnert, R, Riordan, B, and Rhodes, M. Progress in Long Scale Length Laser-Plasma Interactions. United States: N. p., 2003. Web.
Glenzer, S H, Arnold, P, Bardsley, G, Berger, R L, Bonanno, G, Borger, T, Bower, D E, Bowers, M, Bryant, R, Buckman, S, Burkhart, S C, Campbell, K, Chrisp, M P, Cohen, B I, Constantin, G, Cooper, F, Cox, J, Dewald, E, Divol, L, Dixit, S, Duncan, J, Eder, D, Edwards, J, Erbert, G, Felker, B, Fornes, J, Frieders, G, Froula, D H, Gardner, S D, Gates, C, Gonzalez, M, Grace, S, Gregori, G, Greenwood, A, Griffith, R, Hall, T, Hammel, B A, Haynam, C, Heestand, G, Henesian, M, Hermes, G, Hinkel, D, Holder, J, Holdner, F, Holtmeier, G, Hsing, W, Huber, S, James, T, Johnson, S, Jones, O S, Kalantar, D, Kamperschroer, J H, Kauffman, R, Kelleher, T, Knight, J, Kirkwood, R K, Kruer, W L, Labiak, W, Landen, O L, Langdon, A B, Langer, S, Latray, D, Lee, A, Lee, F D, Lund, D, MacGowan, B, Marshall, S, McBride, J, McCarville, T, McGrew, L, Mackinnon, A J, Mahavandi, S, Manes, K, Marshall, C, Mertens, E, Meezan, N, Miller, G, Montelongo, S, Moody, J D, Moses, E, Munro, D, Murray, J, Neumann, J, Newton, M, Ng, E, Niemann, C, Nikitin, A, Opsahl, P, Padilla, E, Parham, T, Parrish, G, Petty, C, Polk, M, Powell, C, Reinbachs, I, Rekow, V, Rinnert, R, Riordan, B, & Rhodes, M. Progress in Long Scale Length Laser-Plasma Interactions. United States.
Glenzer, S H, Arnold, P, Bardsley, G, Berger, R L, Bonanno, G, Borger, T, Bower, D E, Bowers, M, Bryant, R, Buckman, S, Burkhart, S C, Campbell, K, Chrisp, M P, Cohen, B I, Constantin, G, Cooper, F, Cox, J, Dewald, E, Divol, L, Dixit, S, Duncan, J, Eder, D, Edwards, J, Erbert, G, Felker, B, Fornes, J, Frieders, G, Froula, D H, Gardner, S D, Gates, C, Gonzalez, M, Grace, S, Gregori, G, Greenwood, A, Griffith, R, Hall, T, Hammel, B A, Haynam, C, Heestand, G, Henesian, M, Hermes, G, Hinkel, D, Holder, J, Holdner, F, Holtmeier, G, Hsing, W, Huber, S, James, T, Johnson, S, Jones, O S, Kalantar, D, Kamperschroer, J H, Kauffman, R, Kelleher, T, Knight, J, Kirkwood, R K, Kruer, W L, Labiak, W, Landen, O L, Langdon, A B, Langer, S, Latray, D, Lee, A, Lee, F D, Lund, D, MacGowan, B, Marshall, S, McBride, J, McCarville, T, McGrew, L, Mackinnon, A J, Mahavandi, S, Manes, K, Marshall, C, Mertens, E, Meezan, N, Miller, G, Montelongo, S, Moody, J D, Moses, E, Munro, D, Murray, J, Neumann, J, Newton, M, Ng, E, Niemann, C, Nikitin, A, Opsahl, P, Padilla, E, Parham, T, Parrish, G, Petty, C, Polk, M, Powell, C, Reinbachs, I, Rekow, V, Rinnert, R, Riordan, B, and Rhodes, M. 2003. "Progress in Long Scale Length Laser-Plasma Interactions". United States. doi:. https://www.osti.gov/servlets/purl/15006528.
@article{osti_15006528,
title = {Progress in Long Scale Length Laser-Plasma Interactions},
author = {Glenzer, S H and Arnold, P and Bardsley, G and Berger, R L and Bonanno, G and Borger, T and Bower, D E and Bowers, M and Bryant, R and Buckman, S and Burkhart, S C and Campbell, K and Chrisp, M P and Cohen, B I and Constantin, G and Cooper, F and Cox, J and Dewald, E and Divol, L and Dixit, S and Duncan, J and Eder, D and Edwards, J and Erbert, G and Felker, B and Fornes, J and Frieders, G and Froula, D H and Gardner, S D and Gates, C and Gonzalez, M and Grace, S and Gregori, G and Greenwood, A and Griffith, R and Hall, T and Hammel, B A and Haynam, C and Heestand, G and Henesian, M and Hermes, G and Hinkel, D and Holder, J and Holdner, F and Holtmeier, G and Hsing, W and Huber, S and James, T and Johnson, S and Jones, O S and Kalantar, D and Kamperschroer, J H and Kauffman, R and Kelleher, T and Knight, J and Kirkwood, R K and Kruer, W L and Labiak, W and Landen, O L and Langdon, A B and Langer, S and Latray, D and Lee, A and Lee, F D and Lund, D and MacGowan, B and Marshall, S and McBride, J and McCarville, T and McGrew, L and Mackinnon, A J and Mahavandi, S and Manes, K and Marshall, C and Mertens, E and Meezan, N and Miller, G and Montelongo, S and Moody, J D and Moses, E and Munro, D and Murray, J and Neumann, J and Newton, M and Ng, E and Niemann, C and Nikitin, A and Opsahl, P and Padilla, E and Parham, T and Parrish, G and Petty, C and Polk, M and Powell, C and Reinbachs, I and Rekow, V and Rinnert, R and Riordan, B and Rhodes, M},
abstractNote = {The first experiments on the National Ignition Facility (NIF) have employed the first four beams to measure propagation and laser backscattering losses in large ignition-size plasmas. Gas-filled targets between 2 mm and 7 mm length have been heated from one side by overlapping the focal spots of the four beams from one quad operated at 351 nm (3{omega}) with a total intensity of 2 x 10{sup 15} W cm{sup -2}. The targets were filled with 1 atm of CO{sub 2} producing of up to 7 mm long homogeneously heated plasmas with densities of n{sub e} = 6 x 10{sup 20} cm{sup -3} and temperatures of T{sub e} = 2 keV. The high energy in a NIF quad of beams of 16kJ, illuminating the target from one direction, creates unique conditions for the study of laser plasma interactions at scale lengths not previously accessible. The propagation through the large-scale plasma was measured with a gated x-ray imager that was filtered for 3.5 keV x rays. These data indicate that the beams interact with the full length of this ignition-scale plasma during the last {approx}1 ns of the experiment. During that time, the full aperture measurements of the stimulated Brillouin scattering and stimulated Raman scattering show scattering into the four focusing lenses of 6% for the smallest length ({approx}2 mm). increasing to 12% for {approx}7 mm. These results demonstrate the NIF experimental capabilities and further provide a benchmark for three-dimensional modeling of the laser-plasma interactions at ignition-size scale lengths.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2003,
month =
}

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  • Laser-plasma interaction experiments have been carried out on the OMEGA laser system [T. R. Boehly {ital et al.}, Opt. Commun. {bold 133}, 495 (1997)] under plasma conditions representative of the peak of a 1.5 MJ direct-drive laser pulse proposed for the National Ignition Facility (NIF). Plasmas have been formed by exploding 18{endash}20 {mu}m thick CH foils and by irradiating solid CH targets from one side, using up to 20 kJ of laser energy with phase plates installed on all beams. These plasmas and the NIF plasmas are predicted to have electron temperatures of 4 keV and density scale lengths closemore » to 0.75 mm at the peak of the laser pulse. The electron temperature and density of the exploding-foil plasmas have been diagnosed using time-resolved x-ray spectroscopy and stimulated Raman scattering, respectively, and are consistent with predictions of the two-dimensional Eulerian hydrodynamics code SAGE [R. S. Craxton and R. L. McCrory, J. Appl. Phys. {bold 56}, 108 (1984)]. When the solid-target or exploding-foil plasmas were irradiated with an f/6 interaction beam at 1.5{times}10{sup 15}W/cm{sup 2}, well above the NIF f/8 cluster intensity of {approximately}2{times}10{sup 14}W/cm{sup 2}, stimulated Brillouin backscattering (SBS) was found to be completely inhibited. A conservative upper limit of direct-backscattered SRS was found to be {approximately}5{percent} from the solid targets. SRS and SBS are thus unlikely to have a significant impact on target performance at the peak of the NIF direct-drive laser pulse. {copyright} {ital 1999 American Institute of Physics.}« less
  • Hot-electron fractions measured in Nd-laser-plasma interactions at 10/sup 14/ W/cm/sup 2/ increase from <0.02% to 0.3% as plasma scale length at quarter-critical density (n/sub c//4) is systematically increased from 140 to 320 ..mu..m. Correlated x-ray and 3..omega../2 emissions indicate that the hot electrons are produced by an n/sub c//4 instability.
  • A short-pulse, high-intensity Nd-laser beam interacts with preformed plasmas of variable scale length. At the longest scale length, absorption is limited by backscatter, despite increased collisional absorption.
  • Three-wave parametric instabilities, in which an incident, laser-light wave (a pump) resonantly decays into two decay waves, have long been recognized to potentially play a large role in the physics of laser-produced plasmas. Many effects have been predicted, but only gradually and with difficulty have experiments developed the ability to observe some of them. One obstacle has been that the behavior of the instabilities often depends upon the scale-length and planarity of the plasma. My collaborators and I have for several years worked to overcome this specific obstacle, and when necessary now work routinely with plasmas that are thousands ofmore » laser wavelengths in the axial and transverse scale lengths of the plasma parameters. This has allowed us to report the first observations of some instabilities and to study the scaling behavior of several instabilities as well.« less
  • Three-wave parametric instabilities, in which an incident, laser-light wave (a pump) resonantly decays into two decay waves, have long been recognized to potentially play a large role in the physics of laser-produced plasmas. Many effects have been predicted, but only gradually and with difficulty have experiments developed the ability to observe some of them. One obstacle has been that the behavior of the instabilities often depends upon the scale-length and planarity of the plasma. My collaborators and I have for several years worked to overcome this specific obstacle, and when necessary now work routinely with plasmas that are thousands ofmore » laser wavelengths in the axial and transverse scale lengths of the plasma parameters. This has allowed us to report the first observations of some instabilities and to study the scaling behavior of several instabilities as well.« less