scholarly journals High energy x-ray imager for inertial confinement fusion at the National Ignition Facility

2006 ◽  
Vol 77 (10) ◽  
pp. 10E301 ◽  
Author(s):  
Riccardo Tommasini ◽  
Jeffrey A. Koch ◽  
Bruce Young ◽  
Ed Ng ◽  
Tom Phillips ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
High Energy ◽  
Inertial Confinement ◽  
National Ignition Facility ◽  
X Ray ◽  
Confinement Fusion

X‐ray spectroscopy of high‐energy density inertial confinement fusion plasmas

1993 ◽  
Vol 5 (9) ◽  
pp. 3328-3336 ◽  
Author(s):  
C. J. Keane ◽  
B. A. Hammel ◽  
D. R. Kania ◽  
J. D. Kilkenny ◽  
R. W. Lee ◽  
...  
Keyword(s):  
Energy Density ◽  
Inertial Confinement Fusion ◽  
High Energy ◽  
High Energy Density ◽  
Inertial Confinement ◽  
Fusion Plasmas ◽  
X Ray ◽  
Confinement Fusion

scholarly journals Conceptual design of initial opacity experiments on the national ignition facility

2017 ◽  
Vol 83 (1) ◽  
Author(s):  
R. F. Heeter ◽  
J. E. Bailey ◽  
R. S. Craxton ◽  
B. G. DeVolder ◽  
E. S. Dodd ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
High Energy ◽  
High Energy Density ◽  
Inertial Confinement ◽  
X Rays ◽  
X Ray ◽  
Confinement Fusion ◽  
Final Design ◽  
Laser Heated ◽  
Point Projection

Accurate models of X-ray absorption and re-emission in partly stripped ions are necessary to calculate the structure of stars, the performance of hohlraums for inertial confinement fusion and many other systems in high-energy-density plasma physics. Despite theoretical progress, a persistent discrepancy exists with recent experiments at the Sandia Z facility studying iron in conditions characteristic of the solar radiative–convective transition region. The increased iron opacity measured at Z could help resolve a longstanding issue with the standard solar model, but requires a radical departure for opacity theory. To replicate the Z measurements, an opacity experiment has been designed for the National Facility (NIF). The design uses established techniques scaled to NIF. A laser-heated hohlraum will produce X-ray-heated uniform iron plasmas in local thermodynamic equilibrium (LTE) at temperatures ${\geqslant}150$ eV and electron densities ${\geqslant}7\times 10^{21}~\text{cm}^{-3}$. The iron will be probed using continuum X-rays emitted in a ${\sim}200$ ps, ${\sim}200~\unicode[STIX]{x03BC}\text{m}$ diameter source from a 2 mm diameter polystyrene (CH) capsule implosion. In this design, $2/3$ of the NIF beams deliver 500 kJ to the ${\sim}6$ mm diameter hohlraum, and the remaining $1/3$ directly drive the CH capsule with 200 kJ. Calculations indicate this capsule backlighter should outshine the iron sample, delivering a point-projection transmission opacity measurement to a time-integrated X-ray spectrometer viewing down the hohlraum axis. Preliminary experiments to develop the backlighter and hohlraum are underway, informing simulated measurements to guide the final design.

Analysis of electroless nickel thin films

1991 ◽  
Vol 49 ◽  
pp. 510-511 ◽  
Author(s):  
C. W. Price ◽  
E. F. Lindsey
Keyword(s):  
Thin Films ◽  
Inertial Confinement Fusion ◽  
Electroless Nickel ◽  
Inertial Confinement ◽  
Plating Bath ◽  
X Ray ◽  
Nickel Thin Films ◽  
Nickel Deposits ◽  
Confinement Fusion ◽  
Thickness Measurements

Thickness measurements of thin films are performed by both energy-dispersive x-ray spectroscopy (EDS) and x-ray fluorescence (XRF). XRF can measure thicker films than EDS, and XRF measurements also have somewhat greater precision than EDS measurements. However, small components with curved or irregular shapes that are used for various applications in the the Inertial Confinement Fusion program at LLNL present geometrical problems that are not conducive to XRF analyses but may have only a minimal effect on EDS analyses. This work describes the development of an EDS technique to measure the thickness of electroless nickel deposits on gold substrates. Although elaborate correction techniques have been developed for thin-film measurements by x-ray analysis, the thickness of electroless nickel films can be dependent on the plating bath used. Therefore, standard calibration curves were established by correlating EDS data with thickness measurements that were obtained by contact profilometry.

scholarly journals X-ray ablation rates in inertial confinement fusion capsule materials

2011 ◽  
Vol 18 (3) ◽  
pp. 032706 ◽  
Author(s):  
R. E. Olson ◽  
G. A. Rochau ◽  
O. L. Landen ◽  
R. J. Leeper
Keyword(s):  
Inertial Confinement Fusion ◽  
Inertial Confinement ◽  
X Ray ◽  
Confinement Fusion
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