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 \(\Delta\). 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) \(x \) particles and (b) \(3\) particles