
Citation: | Long CHEN, Yuhao AN, Shaojuan SUN, Ping DUAN, Borui JIANG, Yehui YANG, Zuojun CUI. Study on the characteristics of non-Maxwellian magnetized sheath in Hall thruster acceleration region[J]. Plasma Science and Technology, 2022, 24(7): 074011. DOI: 10.1088/2058-6272/ac57fe |
The secondary electron emission (SEE) and inclined magnetic field are typical features at the channel wall of the Hall thruster acceleration region (AR), and the characteristics of the magnetized sheath have a significant effect on the radial potential distribution, ion radial acceleration and wall erosion. In this work, the magnetohydrodynamics model is used to study the characteristics of the magnetized sheath with SEE in the AR of Hall thruster. The electrons are assumed to obey non-extensive distribution, the ions and secondary electrons are magnetized. Based on the Sagdeev potential, the modified Bohm criterion is derived, and the influences of the non-extensive parameter and magnetic field on the AR sheath structure and parameters are discussed. Results show that, with the decrease of the parameter q, the high-energy electron leads to an increase of the potential drop in the sheath, and the sheath thickness expands accordingly, the kinetic energy rises when ions reach the wall, which can aggravate the wall erosion. Increasing the magnetic field inclination angle in the AR of the Hall thruster, the Lorenz force along the x direction acting as a resistance decelerating ions becomes larger which can reduce the wall erosion, while the strength of magnetic field in the AR has little effect on Bohm criterion and wall potential. The propellant type also has a certain effect on the values of wall potential, secondary electron number density and sheath thickness.
Hall thruster is one of the most effective space propulsion devices due to its high specific impulse and excellent precision, which is widely used in satellite attitude control, position maintenance and orbit adjustment [1, 2]. The main structure of Hall thruster includes buffer cavity, anode, discharge channel, electromagnetic coil, magnetic circuit structure and hollow cathode outside the discharge channel, the discharge channel is formed by two coaxial insulated cylinders. The electric field generated in the channel is usually along the central axis which can accelerate ions to produce thrust and electromagnetic coils are located outside the discharge channel to generate a quasi-radial magnetic field [3–5]. The orthogonal electromagnetic fields force electrons to perform
The kinetic simulations studied by Sydorenko [11] and Smirnov [12] have shown that the high-energy tail of the electron velocity distribution function (EVDF) in the thruster is almost exhausted due to the collision between the electrons and the wall; meanwhile, experimental studies [13, 14] have proved that the electron energy distribution function in the thruster obviously deviates from the Maxwellian distribution due to the strong interaction between the electrons and the wall. Maxwellian distribution approximation has its limitations for systems such as long-range Coulomb interactions and non-thermodynamic equilibrium plasmas. However, many of the fluid simulations and mixed simulation on Hall thruster sheath still adopted the Maxwellian distribution of electrons as approximation [3, 15–17]. In 1988, Tsallis [18] introduced a statistical method to extend the Boltzmann entropy concept to non-extensive generalized entropy, and its entropy form is
Sq=kB1-∑Ni=1pqiq-1, | (1) |
where
Sq(I+J)=Sq(I)+Sq(J)+1-qkBSq(I)Sq(J), | (2) |
where
In recent years, the non-extensive distribution of electrons has been applied to study the fundamental problems of plasma sheath under different physical conditions [19–30]. Dhawan et al [21] considered the non-extensive distribution of electron, ion temperature and ion neutral collision in the simulation. The ion enters the sheath region at a velocity lower than the typical Bohm velocity, which would change with the non-extensive parameter, and finally affect the sheath thickness. Zou et al [22] established a fluid model of collisional magnetized plasma sheath with non-extensive electrons and derived the modified Bohm criterion. The study has found that Bohm velocity decreased with the increase of parameter
In conclusion, the non-Maxwellian electron distribution has a significant effect on the sheath characteristics, which should also be considered in the sheath simulation of Hall thruster. Furthermore, the magnetic field strength in the sheath around AR is about 0.15 T, which means the magnetized effects of ions and electrons cannot be ignored. In this work, assuming that electrons obey non-extensive distribution, the effects of non-extensive parameter and magnetic field on Bohm criterion, wall potential, spatial charge density, secondary electron density distribution and ion kinetic energy are studied by numerical simulation. In section 2, the magnetohydrodynamics equations used in this work which consider the magnetization effect, the self-consistent Bohm criterion and the wall floating potential are described. In section 3, the numerical results and discussions are presented. Finally, conclusions are given in section 4.
A magnetized plasma sheath model is established near the wall of the Hall thruster AR, as shown in figure 1. Here,
Using the fluid model and assuming the electrons in the plasma sheath obey the non-extensive distribution of Tsallis statistical theory, the one-dimensional velocity distribution function of the electrons is [26]
fe(v)=Cq{1-(q-1)[mev2e2kBTe-eφ(x)kBTe]}1q-1, | (3) |
where
Cq={ne0Γ(11-q)Γ(11-q-12)[me(1-q)2πkBTe]12,-1<q<1ne0q+12Γ(1q-1+12)Γ(1q-1)[me(q-1)2πkBTe]12,q>1 | (4) |
where
vmax=√2kBTeme(q-1)-2eφme. | (5) |
According to the non-extensive EVDF, and integrating equation (3) in space, the electron density with non-extensive distribution can be obtained as follows:
ne=ne0[1+(q-1)eφkBTe]q+12(q-1), | (6) |
where
The magnetized ions are described by the fluid equations namely, the continuity equation and momentum transport equation, which are shown, in the steady state, in equations (7) and (8):
∂(nivix)∂x=0 | (7) |
mivix∂vi∂x=-e∂φ∂xex+e[vi×B], | (8) |
where
The secondary electrons are generated by high-energy electrons impacting the wall and treated as fluid. Thus, the magnetized secondary electrons in the sheath satisfy the continuity and momentum equations, as follows:
∂(nsvsx)∂x=0 | (9) |
msvsx∂vs∂x=-kBTsns∂ns∂xex+e∂φ∂xex-e[vs×B], | (10) |
where
Poisson's equation that relates the charge density to sheath electrostatic potential is given as:
∂2φ∂x2=-eε0(ni-ne-ns), | (11) |
where
At the wall surface, the secondary electrons flow satisfies the following form:
js=γje, | (12) |
where
ji+js=je. | (13) |
In equation (13)
ji=nivix | (14) |
js=-nsvsx | (15) |
je=CqqkBTeme[1+(q-1)eφwkBTe]qq-1, | (16) |
where
To normalize the above equations, the following dimensionless variables are introduced:
Ne=(1-δ)[1+(q-1)Φ]q+12(q-1) | (17) |
Ni=uix0uix | (18) |
Ns=δusx0us | (19) |
uix∂uix∂ξ=-∂Φ∂ξ+βuiysinθ | (20) |
uix∂uiy∂ξ=β(uizcosθ-uixsinθ) | (21) |
uix∂uiz∂ξ=-βuiycosθ | (22) |
usxmis∂usx∂ξ=∂Φ∂ξ-tsNs∂Ns∂ξ-βusysinθ | (23) |
usxmis∂usy∂ξ=β(usxsinθ-uszcosθ) | (24) |
usxmis∂usz∂ξ=βusycosθ | (25) |
∂2Φ∂ξ2=11-δ(Ne+Ns-Ni), | (26) |
where
Similarly, after normalizing equations (12) and (13), the result is:
γ=qδusx0√me/miAq(δ-1)[1+(q-1)Φw]qq-1 | (27) |
usx0=γδ(γ-1)uix0, | (28) |
where
By introducing Sagdeev potential, the modified Bohm criterion can be derived as follows:
11-δ[1u2ix0(1+βuiy0sinθE0)-(1-δ)(q+1)2-δmisu2sx0-tsmis(-βusy0sinθE0-1)]≤0. | (29) |
where E0 is the normalized electric field at the sheath edge. Considering the drift motion of ions and secondary electrons in the plasma pre-sheath region, the sheath edge velocity components of the ions and secondary electrons in the
u2ix0≥√cos2θ(1-δ)(q+1)2-(δmiscos2θu2sx0-tsmis). | (30) |
The above equation is the Bohm criterion for the magnetized plasma sheath with non-extensive distribution when considering SEE. According to the equations (27), (28) and (30), it can be seen that the minimum ion velocity entering the sheath in the
In addition, the energy conservation of secondary electrons in the sheath can be expressed as
usx0=-√u2sxw-2misΦw, | (31) |
where
The physical parameters used in this work are set as follows:
Figure 2(a) shows the EVDF profile for different non-extensive parameter q according to equation (3). When q=1, the non-extensive distribution function reduces to the Maxwellian distribution. When q < 1, the function profile becomes wider and the peak value is smaller, so the number of high-energy electrons in the system is relatively large. On the contrary, when q > 1, the EVDF shows a clear truncation in the high energy tail, this means in large-q case, high velocity electrons extinct and the number of high-energy electrons in the system is relatively small, this feature could cause narrower sheath thickness due to smaller electron flux to the channel wall. Besides, the influence of q on low velocity electron proportion is nearly linear. Figures 2(b)–(d) show the effects of non-extensive parameter
Figure 2(d) shows that Bohm velocity is lower at high values of parameter q. When the value of q is large, the average velocity of electrons is relatively slow, resulting in the reduction of electron flux to the wall. Consequently, the ion flux at the wall also reduces to preserve the stability of the sheath. According to the continuity equation (7), the Bohm velocity of ions should also decrease. By comparing the two lines in figure 2(d), it can be seen that the ion mass number has little effect on the Bohm velocity.
Figure 3 shows the effect of non-extensive parameter q on several physical quantities in the sheath region when the propellant gas is Xe, two cases of super-extensive distribution (q=0.8 and 0.9) and two cases of sub-extensive distribution (q=1.1 and 1.2) are selected in the simulation. It is clearly seen in figure 3(a) that the potential in the sheath region falls more rapidly for large parameter q, which also causes larger electric field in the sheath. On the other hand, by decreasing the value of q, the wall potential is reduced due to the accumulation of high-energy electrons on the wall, and the sheath potential drop becomes larger.
It is shown in figure 3(b) that the space charge density profile has a peak, the value of which declines as parameter q decreases, and the position of which is closer to the wall with smaller q. According to figure 2(a), when the value of
The magnetic field strength around the wall at thruster AR is relatively large, and its influence on the ions and secondary electrons cannot be ignored. Especially in the type of magnetic shielding Hall thruster, which has attracted extensive attention recently, magnetic lines gather at the outlet wall to form a high potential preventing ions from damaging the wall, in such sheath area, the magnetic field strength grows high, and the magnetization on ions and secondary electrons have significant effects on the physical properties of the sheath.
Figure 4 shows the effects of magnetic field inclination angle on wall potential, ion Bohm velocity and secondary electron number density at the sheath edge. Figure 4(a) shows the variation trend of wall potential with magnetic field angle under different q. When q > 1, the wall potential hardly changes with the increase of angle. When q < 1, the increase of the inclination angle can reduce the wall potential. This is because the magnetic field angle affects the Lorentz force of ions in the x-direction, which hampers the movement of ions towards the wall. It is shown in figure 4(b) that the secondary electron number density at the sheath edge decreases with the increase of magnetic field inclination angle. As the inclination angle takes a high value, the ion density at the wall is less. In order to ensure the stability of the sheath at the wall, the electron density also reduces accordingly. Thus, the secondary electron density decreases under the same
Figure 5 shows the effect of different magnetic field inclination angle on the potential, space charge density, secondary electron density and positive ion kinetic energy in the sheath region. It is seen in figure 5(a) that as the inclination angle decreases, the space potential falls more rapidly and the sheath thickness becomes thinner. The effect of magnetic field inclination angle on wall potential is consistent with that shown in figure 4(a). In addition, the result shows that the inclination angle in the AR has a significant effect on the sheath thickness. Figure 5(b) shows the effect of angle on sheath thickness at different values of q. It is found that the sheath thickness increases with the increase of inclination angle. Figure 5(c) shows that the secondary electron number density in the sheath is relatively less at high values of the inclination angle, which is due to the short sheath length and higher electron flux to the wall. As shown in figure 5(d), with the increase of the inclination angle, the kinetic energy of the ions in the
Figure 6 shows the effect of magnetic field on sheath potential and ion kinetic energy. It is seen in figure 6(a) that as the magnitude of magnetic field enhances, the sheath wall potential and the sheath thickness increase. This is mainly because when the magnitude of magnetic field is small, it has little effect on the sheath potential. Figure 6(b) shows that the kinetic energy of ions
In the radial direction of AR in Hall thruster, potential drop created by the sheath area plays a critical role in the service life of the Hall thruster. Ions elevate the kinetic energy in the sheath and pre-sheath, then bombard and erode the wall. Figure 7 shows the effects of non-extensive parameter q and magnetic field inclination angle
The erosion rate at the wall of Hall thruster is directly proportional to the ion current density perpendicular to the wall and the material sputtering rate which depends on the ion incident energy and incident angle. Thus, the empirical formula for erosion rate can be expressed as
Figure 8 shows the effect of ion axial velocity on AR sheath thickness. The thickness of the sheath gradually expands as the ion axial velocity increases. As shown in figure 8(a), when the magnetic field is about 500 Gs, the sheath thickness has a linear relationship with the ion axial velocity. Once the ion velocity grows rapidly in the AR, the sheath thickness increases accordingly. This phenomenon can be interpreted as that when ion velocity grows, the component of Lorentz force on the ions along the radial direction becomes larger and prevents the ions from reaching the wall, thus the sheath becomes wider in order to maintain the sheath stability. As shown in figure 8(b), when the strength of magnetic field is larger, the sheath thickness changes more obviously. In addition, the atomic mass of the propellant also has a certain influence on the sheath thickness. With the decrease of propellant mass, the change of sheath thickness is clearer, especially when the strength of magnetic field is large, the sheath width with Kr propellant changes nonlinearly.
In this work, a 1D3V fluid model is established to study the characteristics of magnetized sheath with non-Maxwellian distribution elections in the AR of Hall thruster discharging channel. The modified Bohm criterion is deduced according to Sagdeev potential theory, which is self-consistent with the wall potential and SEE yield. It is found that the non-extensive distribution of electrons has a great impact on the potential, net charge, secondary electron number density, Bohm velocity and wall erosion rate.
With the increase of non-extensive parameter q, the number of high-energy electrons in the system is relatively small, the wall potential enhances, the secondary electron number density at the sheath edge increases, the value of the Bohm criterion decreases, and the number of ions entering the sheath enhances. When the magnetic field inclination angle in the sheath of AR is relatively large, the wall potential is low, the secondary electron number density at the sheath edge is less, the value of Bohm criterion is small. However, the sheath magnetic field strength in the AR of Hall thruster has no significant effect on Bohm criterion and wall potential. Moreover, the kind of propellant gas also has a certain effect on the values of wall potential and sheath edge secondary electron number density.
With the decrease of the parameter q, the high-energy electrons lead to an increase of the potential drop in the sheath region, the sheath thickness expands accordingly, the kinetic energy rises when the ions reach the wall, which can aggravate the wall erosion. When the magnetic field inclination angle decreases in the AR of the Hall thruster, the Lorenz force along the
The work is supported by National Natural Science Foundation of China (Nos. 11975062, 11605021, 11975088) and the China Postdoctoral Science Foundation (No. 2017M621120).
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