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DANTE as a primary temperature diagnostic for the NIF iron opacity campaign.
Rev Sci Instrum
March 2021
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
The Opacity Platform on the National Ignition Facility (NIF) has been developed to measure iron opacities at varying densities and temperatures relevant to the solar interior and to verify recent experimental results obtained at the Sandia Z-machine, that diverge from theory. The first set of NIF experiments collected iron opacity data at ∼150 eV to 160 eV and an electron density of ∼7 × 10 cm, with a goal to study temperatures up to ∼210 eV, with electron densities of up to ∼3 × 10 cm. Among several techniques used to infer the temperature of the heated Fe sample, the absolutely calibrated DANTE-2 filtered diode array routinely provides measurements of the hohlraum conditions near the sample.
View Article and Find Full Text PDFCharacterization of single and colliding laser-produced plasma bubbles using Thomson scattering and proton radiography.
Phys Rev E Stat Nonlin Soft Matter Phys
November 2012
Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Time-resolved measurements of electron and ion temperatures using Thomson scattering have been combined with proton radiography data for comprehensive characterization of individual laser-produced plasma bubbles or the interaction of bubble pairs, where reconnection of azimuthal magnetic fields occurs. Measurements of ion and electron temperatures agree with lasnex simulations of single plasma bubbles, which include the physics of magnetic fields. There is negligible difference in temperatures between a single plasma bubble and the interaction region of bubble pairs, although the ion temperature may be slightly higher due to the collision of expanding plasmas.
View Article and Find Full Text PDFDesign of dynamic Hohlraum opacity samples to increase measured sample density on Z.
Rev Sci Instrum
October 2010
Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.
We are attempting to measure the transmission of iron on Z at plasma temperatures and densities relevant to the solar radiation and convection zone boundary. The opacity data published by us to date has been taken at an electron density about a factor of 10 below the 9×10(22)/cm(3) electron density of this boundary. We present results of two-dimensional (2D) simulations of the heating and expansion of an opacity sample driven by the dynamic Hohlraum radiation source on Z.
View Article and Find Full Text PDFMeasuring E and B fields in laser-produced plasmas with monoenergetic proton radiography.
Phys Rev Lett
September 2006
Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Electromagnetic (E/B) fields generated by the interaction with plasmas of long-pulse, low-intensity laser beams relevant to inertial confinement fusion have been measured for the first time using novel monoenergetic proton radiography methods. High-resolution, time-gated radiography images of a plastic foil driven by a 10(14) W/cm(2) laser implied B fields of approximately 0.5 MG and E fields of approximately 1.
View Article and Find Full Text PDFImplosion of indirectly driven reentrant-cone shell target.
Phys Rev Lett
October 2003
General Atomics, San Diego, California 92186, USA.
We have examined the implosion of an indirectly driven reentrant-cone shell target to clarify the issues attendant on compressing fuel for a fast ignition target. The target design is the hydrodynamic equivalent of a NIF cryoignition target scaled to be driven by Omega. Implosions were imaged with backlit x radiographs and modeled with LASNEX.
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