Study on Radiation Characteristics of Cylindrical Hydrogen and Argon Plasma Antennas under Inhomogeneous Magnetic Field

doi:10.19596/j.cnki.1001-246x.8722

Abstract

Abstract:

In this paper, two-dimensional axisymmetric model of hydrogen and argon plasma antenna is established under non-uniform magnetic field conditions, and the effects of magnetic field distribution on electron density distribution, radiation direction map and gain performance of monopole columnar hydrogen and argon plasma antenna are compared and analyzed under low pressure conditions based on COMSOL calculation results. The results show that under certain conditions: 1) The electron distribution of argon plasma antenna is more affected by the magnetic field than that of hydrogen plasma antenna. The electron density distribution of argon plasma antenna is inhomogeneous, while that of hydrogen plasma antenna is relatively uniform. 2) The radiation direction of the hydrogen and argon plasma antenna can be controlled by adjusting the magnetic field and wave frequency. At some specific wave frequencies, the hydrogen and argon plasma antenna have good directivity with small side lobe. Moreover, gain of hydrogen and argon plasma antenna can be improved by changing the magnetic field distribution while maintaining their directivity. 3) The influence of the magnetic field distribution on the gain of the argon plasma antenna is greater than that of the hydrogen plasma antenna. When the magnetic field is mainly near the anode, the gain of the hydrogen plasma antenna is greater than that of the argon plasma antenna. As the magnetic field strength near the cathode increases gradually, the gain of argon plasma antenna is much larger than that of hydrogen plasma antenna.

Key words: hydrogen plasma antenna, argon plasma antenna, radiation direction, antenna gain

CLC Number:

O539

Guangzu PAN, Dan DU, Hua ZHOU, Kaijian YANG, Guanjin QIAO, Shaoxiong HU, Weibo YAO, Xueyu GONG. Study on Radiation Characteristics of Cylindrical Hydrogen and Argon Plasma Antennas under Inhomogeneous Magnetic Field[J]. Chinese Journal of Computational Physics, 2024, 41(3): 334-344.

Figures/Tables 14

Table 1 Related chemical reactions in hydrogen plasma antenna

反应	反应式	碰撞类型	Δε/eV
1	e+H₂→H₂+e	弹性	0
2	e+H₂→2e+H+H⁺	电离	18.1
3	e+H₂→2e+H₂⁺	电离	15.1
4	e+H→H+e	弹性	0
5	e+H→2e+H⁺	弹性	0
6	e+H→e+2H	激发	8.7
7	e+H₂⁺→H₂	附着	0
8	e+H₃⁺→H₂+H	附着	0
9	e+H⁺→H	附着	0

Table 2 Related chemical reactions in argon plasma antenna

反应	反应式	碰撞类型	Δε/eV
1	e+Ar→e+Ar	弹性	0
2	e+Ar→e+Ars	激发	11.5
3	e+Ars→e+Ar	超弹性	-11.5
4	e+Ar→2e+Ar⁺	电离	15.8
5	e+Ars→2e+Ar⁺	电离	4.24
6	Ars+Ars→e+Ar+Ar⁺	潘宁电离
7	Ars+Ar→Ar+Ar	亚稳态淬灭

Fig.1 Integral system model of plasma antenna

Fig.2 Simulation diagram of plasma antenna

Fig.3 Radiation pattern of hydrogen plasma antenna with two coils passing through 30 A current (a) 1 and 2 coils; (b) 1 and 3 coils; (c) 1 and 4 coils; (d) 2 and 3 coils

Fig.4 Radiation pattern of argon plasma antenna with two coils passing through 30 A current (a) 1 and 2 coils; (b) 1 and 3 coils; (c) 1 and 4 coils; (d) 2 and 3 coils

Fig.5 Magnetic field distribution of antenna center axis

Fig.6 Magnetic field distribution at antenna central axis with two coils passing through I0=900 A current

Fig.7 Two-dimensional distribution of electron density in plasma antenna at T=300 K, P=0.5 Torr, I0=900 A (a) hydrogen; (b) argon

Fig.8 Electron density distribution at central axis of hydrogen plasma antenna with two coils passing through current at T=300 K, P=0.5 Torr (a) 1 and 2 coils; (b) 1 and 3 coils; (c) 1 and 4 coils; (d) 2 and 3 coils

Fig.9 Electron density distribution at central axis of argon plasma antenna with two coils passing through current at T=300 K, P=0.5 Torr (a) 1 and 2 coils; (b) 1 and 3 coils; (c) 1 and 4 coils; (d) 2 and 3 coils

Fig.10 Gain diagram of hydrogen plasma antenna with two coils passing through current at w = 0.65 GHz (a) 1 and 2 coils; (b) 1 and 3 coils; (c) 1 and 4 coils; (d) 2 and 3 coils

Fig.11 Gain diagram of argon plasma antenna with any two coils passing through currents at w = 0.50 GHz (a) 1 and 2 coils; (b) 1 and 3 coils; (c) 1 and 4 coils; (d) 2 and 3 coils

Fig.12 Gain diagram of argon plasma antenna with two coils passing through current at w = 0.65 GHz (a) 1 and 2 coils; (b) 1 and 3 coils; (c) 1 and 4 coils; (d) 2 and 3 coils

References 14

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