scholarly journals Radiographic areal density measurements on the OMEGA EP laser system

2021 ◽  
Vol 92 (5) ◽  
pp. 053901
Author(s):  
Camelia V. Stan ◽  
Alison M. Saunders ◽  
Matthew P. Hill ◽  
Tom Lockard ◽  
Kyle Mackay ◽  
...  
Keyword(s):  
Laser System ◽  
Areal Density ◽  
Density Measurements

Time-Resolved Areal-Density Measurements with Proton Spectroscopy in Spherical Implosions

2003 ◽  
Vol 90 (13) ◽  
Author(s):  
V. A. Smalyuk ◽  
P. B. Radha ◽  
J. A. Delettrez ◽  
V. Yu. Glebov ◽  
V. N. Goncharov ◽  
...  
Keyword(s):  
Areal Density ◽  
Proton Spectroscopy ◽  
Time Resolved ◽  
Density Measurements

scholarly journals In situcalibration of the Gamma Reaction History instrument using reference samples (“pucks”) for areal density measurements

2013 ◽  
Vol 59 ◽  
pp. 13019 ◽  
Author(s):  
N.M. Hoffman ◽  
H.W. Herrmann ◽  
Y.H. Kim ◽  
H.H. Hsu ◽  
C.J. Horsfield ◽  
...  
Keyword(s):  
Areal Density ◽  
Density Measurements ◽  
Reference Samples

scholarly journals Radiochemistry measurements on the Phebus laser

1992 ◽  
Vol 10 (4) ◽  
pp. 585-597 ◽  
Author(s):  
D. Schirmann ◽  
C. Bayer ◽  
J. P. Garçonnet ◽  
D. Juraszek ◽  
A. Bertin ◽  
...  
Keyword(s):  
Blue Light ◽  
Areal Density ◽  
Liquid Density ◽  
Density Measurements ◽  
Fuel Density ◽  
Neutron Diagnostics

We are developing neutron diagnostics to characterize the implosions performed with the Phebus laser, operating at 5 kJ blue light delivered in 1·3 ns. For measuring the glass pusher areal density, (ρΔR), of the target, a silicon radiochemistry diagnostic has been implemented and is currently being used. We describe the diagnostic and its performance. Pusher areal density measurements, (ρΔR) and calculated values of fuel density are given. Deuterium (D)-tritium (T) final densities as high as 100 × D-T liquid density (20 g/cm3) have been achieved.

scholarly journals Areal Density Measurement is a Convenient Method for the Determination of Porcine Islet Equivalents without Counting and Sizing Individual Islets

2003 ◽  
Vol 12 (1) ◽  
pp. 33-41 ◽  
Author(s):  
N. Lembert ◽  
J. Wesche ◽  
P. Petersen ◽  
M. Doser ◽  
H. D. Becker ◽  
...  
Keyword(s):  
Gradient Centrifugation ◽  
Density Measurement ◽  
Areal Density ◽  
Single Step ◽  
Method Error ◽  
Entire Area ◽  
Density Measurements ◽  
Islet Mass ◽  
Porcine Islet

The determination of islet mass is important for the normalization of islet experiments in the laboratory and for the precise dosing of islets for transplantation. The common microscopical analysis is based on individual islet sizing, calculation of the frequency distribution, and conversion into islet equivalents (IEQ), which is the volume of a spherical islet with a diameter of 150 μm. However, islets are of irregular form, which makes this determination user dependent, and the analysis is irreproducible once the original sample is discarded. This routine technique of islet quantification was compared with the analysis of areal density measurements. It was assumed that the entire area occupied by islets can be expressed in IEQ without sizing and counting individual islets. Porcine islets were isolated by continuous digestion/filtration and purified by gradient centrifugation. Purified islets were stained with dithizone and were repeatedly pictured under the microscope with random area selection. A total of 51 pictures was taken from 11 different purifications and stained islets were detected by digital image analysis. The correlation coefficient (r) between both analyses was 0.977 with an underestimation of islet yield by areal density detection (slope: 0.75 ± 0.03). Areal density analysis per picture took about 1 min, which is about 10 times faster than the traditional method without increasing the method error (CV 2.1% vs. 2.7%). In summary, areal density measurements allow a rapid and reproducible estimation of IEQ without counting individual islets. It can be performed in a single step analysis without computer programming and is valuable for online determinations of islet yield preceding transplantation.

A new neutron time-of-flight detector for fuel-areal-density measurements on OMEGA

2014 ◽  
Vol 85 (11) ◽  
pp. 11E102 ◽  
Author(s):  
V. Yu. Glebov ◽  
C. J. Forrest ◽  
K. L. Marshall ◽  
M. Romanofsky ◽  
T. C. Sangster ◽  
...  
Keyword(s):  
Time Of Flight ◽  
Areal Density ◽  
Density Measurements ◽  
Neutron Time

Limits on the Accuracy of Stoichiometry Determined by Rutherford Backscattering Using Computer Peak Fitting.

1987 ◽  
Vol 93 ◽  
Author(s):  
L. C. Mcintyre ◽  
M. D. Ashbaugh ◽  
J. A. Leavitt
Keyword(s):  
Elastic Scattering ◽  
Rutherford Backscattering Spectrometry ◽  
Areal Density ◽  
Rutherford Backscattering ◽  
Sample Thickness ◽  
Density Measurements ◽  
Peak Fitting ◽  
Scattering Spectra ◽  
Overlapping Peaks

ABSTRACTRutherford Backscattering Spectrometry (RBS) using MeV ions is capable of routinely measuring absolute atomic areal densities to an accuracy of about 3% and relative areal densities to a fraction of 1% if the elastic scattering peaks from different elements do not overlap. The accuracy of areal density measurements can be seriously reduced in cases where the sample thickness is large enough to cause overlapping peaks. We report here an investigation of the use of standard computer fitting techniques to analyze overlapping peaks in elastic scattering spectra and its effect on the accuracy of the final results of an RBS analysis.

{10} edge dislocations in YSZ films grown on (100)MgO by PLD

1994 ◽  
Vol 52 ◽  
pp. 530-531
Author(s):  
Jason R. Heffelfinger ◽  
C. Barry Carter
Keyword(s):  
Thin Films ◽  
Semiconductor Lasers ◽  
Vapor Deposition ◽  
Substrate Surface ◽  
Laser System ◽  
Average Energy ◽  
Target Material ◽  
Chemical Vapor ◽  
Buffer Layers ◽  
Organic Chemical

Yttria-stabilized zirconia (YSZ) is currently used in a variety of applications including oxygen sensors, fuel cells, coatings for semiconductor lasers, and buffer layers for high-temperature superconducting films. Thin films of YSZ have been grown by metal-organic chemical vapor deposition, electrochemical vapor deposition, pulse-laser deposition (PLD), electron-beam evaporation, and sputtering. In this investigation, PLD was used to grow thin films of YSZ on (100) MgO substrates. This system proves to be an interesting example of relationships between interfaces and extrinsic dislocations in thin films of YSZ.In this experiment, a freshly cleaved (100) MgO substrate surface was prepared for deposition by cleaving a lmm-thick slice from a single-crystal MgO cube. The YSZ target material which contained 10mol% yttria was prepared from powders and sintered to 85% of theoretical density. The laser system used for the depositions was a Lambda Physik 210i excimer laser operating with KrF (λ=248nm, 1Hz repetition rate, average energy per pulse of 100mJ).

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