scholarly journals Reliability of temperature determination from curve-fitting in multi-wavelength pyrometery

2013 ◽  
Vol 31 (2) ◽  
pp. 333-336
Author(s):  
P.A. Ni ◽  
R.M. More ◽  
F.M. Bieniosek
Keyword(s):  
Ion Beam ◽  
Dense Matter ◽  
Warm Dense Matter ◽  
Emission Data ◽  
Reliable Determination ◽  
Temperature Determination ◽  
Multi Wavelength ◽  
Fitting In ◽  
Hot Surface

AbstractThis paper examines the reliability of a widely used method for temperature determination by multi-wavelength pyrometry. In recent warm dense matter experiments with ion-beam heated metal foils, we found that the statistical quality of the fit to the measured data is not necessarily a measure of the accuracy of the inferred temperature. We found a specific example where a second-best fit leads to a more realistic temperature value. The physics issue is the wavelength-dependent emissivity of the hot surface. We discuss improvements of the multi-frequency pyrometry technique, which will give a more reliable determination of the temperature from emission data.

scholarly journals Proton stopping measurements at low velocity in warm dense carbon

2021 ◽  
Author(s):  
Sophia Malko ◽  
Witold Cayzac ◽  
Valeria Ospina-Bohorquez ◽  
Krish Bhutwala ◽  
M Bailly-Grandvaux ◽  
...  
Keyword(s):  
Energy Loss ◽  
Inertial Confinement Fusion ◽  
Density Functional ◽  
Bragg Peak ◽  
Ion Beam ◽  
Dense Matter ◽  
Stopping Power ◽  
Low Velocity ◽  
Warm Dense Matter ◽  
Modeling Uncertainties

Abstract Ion stopping in warm dense matter is a process of fundamental importance for the understanding of the properties of dense plasmas, the realization and the interpretation of experiments involving ion-beam-heated warm dense matter samples, and for inertial confinement fusion research. The theoretical description of the ion stopping power in warm dense matter is difficult notably due to electron coupling and degeneracy, and measurements are still largely missing. In particular, the low-velocity stopping range around the Bragg peak, that features the largest modeling uncertainties, remains virtually unexplored. Here, we report proton energy-loss measurements in warm dense plasma at unprecedented low projectile velocities, approaching significantly the Bragg-peak region. Our energy-loss data, combined with a precise target characterization based on plasma emission measurements using two independent spectroscopy diagnostics, demonstrate a significant deviation of the stopping power from classical models in this regime. In particular, we show that our results are consistent with recent first-principles simulations based on time-dependent density functional theory.

Experiments in warm dense matter using an ion beam driver

2007 ◽  
Author(s):  
F.M. Bieniosek ◽  
M. Leitner ◽  
B.G. Logan ◽  
R.M. More ◽  
P.K. Roy ◽  
...  
Keyword(s):  
Ion Beam ◽  
Dense Matter ◽  
Warm Dense Matter

scholarly journals Ion-beam-driven warm dense matter experiments

2010 ◽  
Vol 244 (3) ◽  
pp. 032028 ◽  
Author(s):  
F M Bieniosek ◽  
J J Barnard ◽  
A Friedman ◽  
E Henestroza ◽  
J Y Jung ◽  
...  
Keyword(s):  
Ion Beam ◽  
Dense Matter ◽  
Warm Dense Matter

scholarly journals Tamped target for warm dense matter experiments using intense heavy ion beam

2008 ◽  
Vol 112 (4) ◽  
pp. 042027 ◽  
Author(s):  
T Sasaki ◽  
T Kikuchi ◽  
M Nakajima ◽  
T Kawamura ◽  
K Horioka
Keyword(s):  
Ion Beam ◽  
Dense Matter ◽  
Heavy Ion ◽  
Warm Dense Matter ◽  
Heavy Ion Beam

scholarly journals Charge Equilibrium of a Laser-Generated Carbon-Ion Beam in Warm Dense Matter

2013 ◽  
Vol 110 (13) ◽  
Author(s):  
M. Gauthier ◽  
S. N. Chen ◽  
A. Levy ◽  
P. Audebert ◽  
C. Blancard ◽  
...  
Keyword(s):  
Ion Beam ◽  
Dense Matter ◽  
Warm Dense Matter ◽  
Carbon Ion ◽  
Charge Equilibrium ◽  
Carbon Ion Beam
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