7/27/2023 0 Comments Alpha particles![]() ![]() ![]() 4,5 As far as we know, the binary collision (BC) model was first used in the early studies. 1,2 In order to simulate the pellet gain and burn processes in inertia confinement fusion (ICF), 3 the data for the slowing down must be accurately known for a wide range of the electron (T e) and ion temperature (T i) from tens of eV to 200 keV, and electron number density (n e) from ∼10 21 to ∼10 26 cm −3. The slowing down or energy deposition of 3.54 MeV alpha particles in DT plasmas is a basic problem in the research of the controlled fusion, and the relevant investigation has been made over half a century. Some unreliable data are found in the last model, which include the range of alpha particles and the electron-ion energy partition fraction when the electron is much hotter than the deuteron and triton in the plasmas. Meanwhile, the two important models are found not to work in this case. Our model is found to be able to provide relevant, reliable data in the large range of the density and temperature mentioned above, even if the density is around 10 26 cm −3 while the deuteron and triton temperature is below 500 eV. This leads to less energy deposition to the deuteron and triton than that if the recoil of the projectile is neglected when the temperature is close to or higher than 100 keV. It is found that the plasmas will not be heated by the alpha particle in its slowing down the process once the projectile energy becomes close to or less than the temperature of the electron or the deuteron and triton in the plasmas. The comparison with other models is made and the reason for their difference is explored. It includes the rate of the energy change and range of the projectile, and the partition fraction of its energy deposition to the deuteron and triton. With the effects of the projectile recoil and plasma polarization considered, the slowing down of 3.54 MeV alpha particles is studied in inertial confinement fusion DT plasmas within the plasma density range from 10 24 to 10 26 cm −3 and the temperature range from 100 eV to 200 keV. ![]()
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