100
E. L. Stupitsky et al.
where N p = 1.31×10
21 is the number of protons in TPB, W e = 33 eV is the average
energy required to form one electron–ion pair.
The deceleration of particles is sharp nature at all background concentrations.
The electron concentration in the region of TPB passage significantly exceeds the
background. The effect increases sharply with increasing proton velocity both in
range and in electron concentration at the corresponding height.
The work showed that further improvement of the hydrogen-based plasma gun
will achieve a plasma flow rate of 5 × 10
8 cm/s or more. This is important for the
application of plasma guns in the issue of the effect of a rarefied plasma flow on the
barrier.
7.7 The Effect of a Rarefied Plasma Flow on the Barrier
The present state of research on the effects on materials of pulsed beams of high
particle density is given in [8].
Many sensitive elements of spacecraft are protected from possible environmental
influences by glasses, which at the same time impose certain requirements on their
optical properties—the ability to transmit radiation in a certain spectral range. The
aim of this work is to use the molecular dynamics method for the numerical study
of the effect of a rarefied plasma flow of a certain duration on a crystalline and
amorphous structure, such as glass, to assess the nature and size of emerging defects
and their effect on the transmission of light. For the model of continuous deceleration
as a result of inelastic collisions, the Lindhard–Sharf theory gives good agreement
with experiment [7]. However, to determine the structure of dislocations arising
in a solid, a more detailed approach to the problem of energy dissipation by ions is
needed. In [9], a numerical algorithm was developed for calculating the spatial motion
of particles in a crystalline and amorphous body based on the presented molecular
dynamics. A hybrid model was used for the collisional interaction of particles: if
the limiting parameter ρ ≤ R 1 + R 2 , then the model of elastic balls was used. If
ρ > R 1 + R 2 , then the Coulomb interaction was assumed (R 1 , R 2 is the radius
of the particles). It is important that the multiplication of particles involved in the
destruction of the crystal lattice is taken into account.
Figure 7.9 presents the effect of destruction of the Si crystal lattice at dissimilar
energies of the hydrogen atom and its trajectory of motion.
Numerous calculations were performed for various types of plasma particles, their
various energies and various amorphous and crystalline elements of a solid. The
algorithm also takes into account the possibility of several falling particles entering
the same cavity. Based on the results obtained, light scattering (λ = 0.5 µm) was
studied on a defective surface of a transparent body. It is shown that as a result of
the impact of TPB on protective glasses, they scatter from 20 to 50% of the incident
light flux, which makes their functional purpose impossible as a means of protecting
guiding devices.
E. L. Stupitsky et al.
where N p = 1.31×10
21 is the number of protons in TPB, W e = 33 eV is the average
energy required to form one electron–ion pair.
The deceleration of particles is sharp nature at all background concentrations.
The electron concentration in the region of TPB passage significantly exceeds the
background. The effect increases sharply with increasing proton velocity both in
range and in electron concentration at the corresponding height.
The work showed that further improvement of the hydrogen-based plasma gun
will achieve a plasma flow rate of 5 × 10
8 cm/s or more. This is important for the
application of plasma guns in the issue of the effect of a rarefied plasma flow on the
barrier.
7.7 The Effect of a Rarefied Plasma Flow on the Barrier
The present state of research on the effects on materials of pulsed beams of high
particle density is given in [8].
Many sensitive elements of spacecraft are protected from possible environmental
influences by glasses, which at the same time impose certain requirements on their
optical properties—the ability to transmit radiation in a certain spectral range. The
aim of this work is to use the molecular dynamics method for the numerical study
of the effect of a rarefied plasma flow of a certain duration on a crystalline and
amorphous structure, such as glass, to assess the nature and size of emerging defects
and their effect on the transmission of light. For the model of continuous deceleration
as a result of inelastic collisions, the Lindhard–Sharf theory gives good agreement
with experiment [7]. However, to determine the structure of dislocations arising
in a solid, a more detailed approach to the problem of energy dissipation by ions is
needed. In [9], a numerical algorithm was developed for calculating the spatial motion
of particles in a crystalline and amorphous body based on the presented molecular
dynamics. A hybrid model was used for the collisional interaction of particles: if
the limiting parameter ρ ≤ R 1 + R 2 , then the model of elastic balls was used. If
ρ > R 1 + R 2 , then the Coulomb interaction was assumed (R 1 , R 2 is the radius
of the particles). It is important that the multiplication of particles involved in the
destruction of the crystal lattice is taken into account.
Figure 7.9 presents the effect of destruction of the Si crystal lattice at dissimilar
energies of the hydrogen atom and its trajectory of motion.
Numerous calculations were performed for various types of plasma particles, their
various energies and various amorphous and crystalline elements of a solid. The
algorithm also takes into account the possibility of several falling particles entering
the same cavity. Based on the results obtained, light scattering (λ = 0.5 µm) was
studied on a defective surface of a transparent body. It is shown that as a result of
the impact of TPB on protective glasses, they scatter from 20 to 50% of the incident
light flux, which makes their functional purpose impossible as a means of protecting
guiding devices.