Experimental Validation of Low- Ion-Stopping Formalisms around the Bragg Peak in High-Energy-Density Plasmas
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Univ. de Las Palmas de Gran Canaria, Las Palmas de Gran Canaria (Spain)
- Univ. of Nevada, Reno, NV (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of Rochester, Rochester, NY (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Here, 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 × 1023 –8 × 1023 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 vi ~0.3vth, 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.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1542701
- Alternate ID(s):
- OSTI ID: 1559506
- Report Number(s):
- LLNL-JRNL--756658; 943886
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 1 Vol. 122; ISSN 0031-9007; ISSN PRLTAO
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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