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Table 1.

Comparison and scalability between the laser-driven plasma stream and a range of possible YSO accretion inflows (as described in Sect. 3.1).

PEARL YSOsmin YSOsmax (i)
Material CF2 (Teflon) H H
Z 6 1 1
A 17.3 1.3 1.3

B [G] 1.4×105 35 350
L [cm] 1 2×1011 5×1011
ne[cm−3] 5×1017 1013 1014
ρ[g.cm−3] 2.4 × 10−6 2.1 × 10−11 2.1 × 10−10
Te[kK] 500 1 10
Ti[kK] 500 1 10
Vflow[km.s−1] 100 10 30
CS[km.s−1] 53 5 15
VA[km.s−1] 245 22 68
le[cm] 10−3 2.3 × 10−3 1.5 × 10−2
li[cm] 4 × 10−5 3.2 × 10−3 2.1 × 10−2
τcol e[ns] 3.8 × 10−3 0.2 0.4
τcol i[ns] 2.7 × 10−2 13 27
[ns] 9.6 210 450
RLe[cm] 1.2 × 10−4 2 × 10−2 6.2 × 10−3
RLi[cm] 3.4 × 10−3 1 0.3
fce[s−1] 3.8 × 1011 108 109
fci[s−1] 7.1 × 107 4.2 × 104 4.2 × 105
M 1.9 1.9 1.9
Malf 0.4 0.4 0.4
τη[ns] 6.7 × 103 2.6 × 1023 3.5 × 1025
ReM 67 1.2 × 109 2 × 1011
Re 1.6 × 105 2.2 × 1014 8.1 × 1013
Pe 13 3.9 × 1012 1.4 × 1012
Eu 2.5 2.5 2.5
β 5.5 × 10−2 5.5 × 10−2 5.5 × 10−2

Notes. (i)The primary parameters are in bold, and the remaining numbers are derived from the primary numbers. The symbols are as follows: Z is the charge state, A is the mass number, B is the magnetic field, L is the spatial scale, ne is the electron density, ρ is the mass density, Te is the electron temperature, Ti is the ion temperature, Vflow is the stream velocity, CS is the sound velocity, VA is the Alfven velocity (VA = , where ni is the ion density and mi is the ion mass), le is the collisional electron mean free path, τcol e is the electron collision time, RLe is the electron Larmor radius, fce is the electron gyrofrequency, li is the collisional ion mean free path, τcol i is the ion collision time, [ns] is the electron-ion equilibration time, RLi is the ion Larmor radius, fci is the ion gyrofrequency, M is the Mach number, Malf is the Alfven Mach number (Malf = V/VA), τη is the magnetic diffusion time (τη = L2/η, where η is the magnetic diffusivity), ReM is the magnetic Reynolds number (ReM = LV/η), Re is the Reynolds number (Re = LV/ν, where ν is the kinematic viscosity), Pe is the Peclet number (Pe = LV/χ, where χ is the thermal diffusivity), Eu is the Euler number, and β is the plasma beta.

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