Quenching of the Nonlocal Electron Heat Transport by Large External Magnetic Fields in a Laser-Produced Plasma Measured with Imaging Thomson Scattering

doi:10.1103/PHYSREVLETT.98.135001

Title: Quenching of the Nonlocal Electron Heat Transport by Large External Magnetic Fields in a Laser-Produced Plasma Measured with Imaging Thomson Scattering

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Abstract

We present a direct measurement of the quenching of nonlocal heat transport in a laser-produced plasma by applying large external magnetic fields (>10 T). The temporally resolved Thomson-scattering measurements of the electron temperature profile show that the heat front propagation transverse to a high-power laser beam is slowed resulting in extremely strong local heating. We find agreement with hydrodynamic modeling when including a magnetic field model that self-consistently evolves the fields in the plasma.

Authors:

Froula, D. H.; Ross, J. S.; Pollock, B. B.; Davis, P.; James, A. N.; Divol, L.; Edwards, M. J.; Offenberger, A. A.; Price, D.; Town, R. P. J.; Tynan, G. R.; Glenzer, S. H. ^[1]

L-399, Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551 (United States)

Publication Date:: Fri Mar 30 00:00:00 EDT 2007

OSTI Identifier:: 20951189

Resource Type:: Journal Article

Resource Relation:: Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 13; Other Information: DOI: 10.1103/PhysRevLett.98.135001; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ELECTRON TEMPERATURE; HEAT TRANSFER; LASER-PRODUCED PLASMA; LASERS; MAGNETIC FIELDS; SIMULATION; THOMSON SCATTERING

Citation Formats


                    Froula, D. H., Ross, J. S., Pollock, B. B., Davis, P., James, A. N., Divol, L., Edwards, M. J., Offenberger, A. A., Price, D., Town, R. P. J., Tynan, G. R., and Glenzer, S. H. Quenching of the Nonlocal Electron Heat Transport by Large External Magnetic Fields in a Laser-Produced Plasma Measured with Imaging Thomson Scattering.  United States: N. p., 2007. 
        Web.  doi:10.1103/PHYSREVLETT.98.135001.

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                    Froula, D. H., Ross, J. S., Pollock, B. B., Davis, P., James, A. N., Divol, L., Edwards, M. J., Offenberger, A. A., Price, D., Town, R. P. J., Tynan, G. R., & Glenzer, S. H. Quenching of the Nonlocal Electron Heat Transport by Large External Magnetic Fields in a Laser-Produced Plasma Measured with Imaging Thomson Scattering.  United States.  doi:10.1103/PHYSREVLETT.98.135001.

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                    Froula, D. H., Ross, J. S., Pollock, B. B., Davis, P., James, A. N., Divol, L., Edwards, M. J., Offenberger, A. A., Price, D., Town, R. P. J., Tynan, G. R., and Glenzer, S. H. Fri .  
        "Quenching of the Nonlocal Electron Heat Transport by Large External Magnetic Fields in a Laser-Produced Plasma Measured with Imaging Thomson Scattering".  United States.  
        doi:10.1103/PHYSREVLETT.98.135001.

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@article{osti_20951189,

  title        = {Quenching of the Nonlocal Electron Heat Transport by Large External Magnetic Fields in a Laser-Produced Plasma Measured with Imaging Thomson Scattering},

  author       = {Froula, D. H. and Ross, J. S. and Pollock, B. B. and Davis, P. and James, A. N. and Divol, L. and Edwards, M. J. and Offenberger, A. A. and Price, D. and Town, R. P. J. and Tynan, G. R. and Glenzer, S. H.},

  abstractNote = {We present a direct measurement of the quenching of nonlocal heat transport in a laser-produced plasma by applying large external magnetic fields (>10 T). The temporally resolved Thomson-scattering measurements of the electron temperature profile show that the heat front propagation transverse to a high-power laser beam is slowed resulting in extremely strong local heating. We find agreement with hydrodynamic modeling when including a magnetic field model that self-consistently evolves the fields in the plasma.},

  doi          = {10.1103/PHYSREVLETT.98.135001},

  journal      = {Physical Review Letters},

  number       = 13,

  volume       = 98,

  place        = {United States},

  year         = {Fri Mar 30 00:00:00 EDT 2007},

  month        = {Fri Mar 30 00:00:00 EDT 2007}

}

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DOI: 10.1103/PHYSREVLETT.98.135001

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Quenching of the nonlocal electron heat transport by large external magnetic fields in a laser produced plasma measured with imaging Thomson scattering

Froula, D H ; Davis, P ; Pollock, B B ; ... - Physical Review Letters, vol. 98, no. 135001, March 30, 2007, pp. 135001

We present a direct measurement of the quenching of nonlocal heat transport in a laser produced plasma by high external magnetic fields. Temporally resolved measurements of the electron temperature profile transverse to a high power laser beam were obtained using imaging Thomson scattering. The results are simulated with the 2D hydrodynamic code LASNEX with a recently included magnetic field model that self-consistently evolves the fields in the plasma.
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Scattered light diagnostics offer the attractive possibility of extracting detailed spatial information about the distribution of ions and electrons and associated plasma parameters in high-density plasmas that are relevant to inertial confinement fusion (ICF). Here, temporally integrated ultraviolet collective Thomson scattering measurements were performed with frequency-quadrupled Nd:YAG laser radiation on an underdense long-scale length aluminum plasma (n{sub c} {approximately} 10{sup 21} cm{sup {minus}3}, Z {approx} 7, T{sub e} {approx} T{sub i} {ge} 50 eV, L {ge} 100 {micro}m). The plasma was preformed by an Nd:YAG fundamental beam (1.06 {micro}m) with focusable intensities of 10{sup 11} W/cm{sup 2}. Color images ofmore »« less
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Thomson scattering has been shown to be a valuable technique for measuring the plasma conditions in laser produced plasmas. Measurement techniques that use the ion-acoustic frequency measured from the collective Thomson-scattering spectrum to extract the electron temperature, ion temperature, plasma flow, and electron density in a laser produced plasma are discussed. In a recent study [D. Froula et al., Phys. Rev. Lett. 95, 195005 (2005)], we demonstrated a novel Thomson-scattering technique that employs multiple color Thomson-scattering diagnostics to measure the dispersion of ion-acoustic fluctuations. We obtained frequency-resolved Thomson-scattering spectra of the two separate thermal ion-acoustic fluctuations with significantly different wavemore »« less
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