Experimental validation of low-Z ion-stopping formalisms around the Bragg peak in high-energy-density plasmas
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PhysRevLett.122.015002.pdf
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Author(s)
Frenje, Johan A
Florido, R.
Mancini, R.
Nagayama, T.
Grabowski, P. E.
Rinderknecht, H.
Sio, H.
Zylstra, A.
Gatu Johnson, Maria
Li, Chikang
Date Issued
January 2019
Journal
Physical review letters
Publisher
American Physical Society
Citation
Frenje, J.A., et al., "Experimental validation of low-Z ion-stopping formalisms around the Bragg peak in high-energy-density plasmas." Physical review letters 122 (2019): no. 015002 doi 10.1103/PhysRevLett.122.015002 ©2019 Author(s)
Version
Final published version
Abstract
We report on the first accurate validation of low-Z ion-stopping formalisms in the regime ranging from low-velocity ion stopping—through the Bragg peak—to high-velocity ion stopping in well-characterized high-energy-density plasmas. These measurements were executed at electron temperatures and number densities in the range of 1.4–2.8 keV and 4×10^{23}–8×10^{23} cm^{−3}, respectively. For these conditions, it is experimentally demonstrated that the Brown-Preston-Singleton formalism provides a better description of the ion stopping than other formalisms around the Bragg peak, except for the ion stopping at v_{i}∼0.3v_{th}, where the Brown-Preston-Singleton formalism significantly underpredicts the observation. It is postulated that the inclusion of nuclear-elastic scattering, and possibly coupled modes of the plasma ions, in the modeling of the ion-ion interaction may explain the discrepancy of ∼20% at this velocity, which would have an impact on our understanding of the alpha energy deposition and heating of the fuel ions, and thus reduce the ignition threshold in an ignition experiment. ©2019
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.122.015002
