Debye Shielding

Metadata

• CONTEXTO : Segundo ciclo universitário
• AREA: Física
• DISCIPLINA: Física e Tecnologia dos Plasmas
• ANO: 4
• LINGUA: en
• AUTOR: Vasco Guerra
• MATERIA PRINCIPAL: Debye shielding and fundamental efects
• DESCRICAO: Number density
• DIFICULDADE: *
• TEMPO MEDIO DE RESOLUCAO: 300 [s]
• TEMPO MAXIMO DE RESOLUCAO: 600 [s]
• PALAVRAS CHAVE: plasma density, number density

(F. F. Chen ~ 1.3) On a log-log plot of $n$ [$m^{-3}$] vs kTe (eV) draw lines of constant $\lambda_D$ and $Lambda$. On the graph place the following points:

a) Tokamak ($T_{e}$ $\simeq$ 1 keV, $n_e\simeq10^{13} \, cm^{-3}$)

b) Solar wind near the Earth ( $T_e \simeq 10 eV, n_e\simeq10 \, cm^{-3}$ )

c) Ionosphere, ~ 300 km above Earth’s surface ( $T_e \simeq0.1eV, \, n_e\simeq 10^6 \, cm^{-3}$)

d) Laser fusion ($T_e \simeq 1 \; keV, \, n_e\simeq 10^{20} cm^{-3}$ )

e) Gaseous electronics ($T_e \simeq 1 \; eV, \, n_e\simeq 10^{10} cm^{-3}$ )

f) Interstellar medium ($T_e \simeq 1 \; eV, \, n_e\simeq 10^{-1} cm^{-3}$ )

g) Flame ($T_e \simeq 0.1 \; eV, \, n_e\simeq 10^{8} cm^{-3}$ )

Answer

(a)

(b)

(c)

(d)

(e)

(f)

(g)