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Ch.14. DC Discharge §14.1 (p.451) Def of Various Regimes of a dc normal glow

arc. Townsend. R. s.s. Ch.14. DC Discharge §14.1 (p.451) Def of Various Regimes of a dc normal glow PDP: neg glow only (~1lm/w) fluores. light: pos. glow (~70lm/w) §14.2 Positive Glow Column (s.s.) 1-D analysis ( ch.5 & same as for rf discharge. ch.10)

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Ch.14. DC Discharge §14.1 (p.451) Def of Various Regimes of a dc normal glow

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  1. arc Townsend R s.s. Ch.14. DC Discharge §14.1 (p.451) Def of Various Regimes of a dc normal glow PDP: neg glow only (~1lm/w) fluores. light: pos. glow (~70lm/w) §14.2 Positive Glow Column (s.s.) 1-D analysis ( ch.5 & same as for rf discharge. ch.10) (1)Te Improved eq. For Te (2) cyl. 2.405 Eq. for Te

  2. The total ohmic power per length lost power radial loss only 1-D Thus (14.2.6) (14.2.10) (discharge current, input)

  3. 14.3 Cathode Sheath : Vac. Breakdown ; Paschen Law(14.3.9) Question:what’s needed to breakdown Ar? at Pn = 1Torr, d =1 cm vb brkdn Ar Meaning ofbrkdn ne • Townsend 1st Ionization Coeff. t ne p ne(z) i e z • Breakdown or No-Breakdown (in simulation) • Ni or Ne increasing exponentially (faster than linear in t) • Ni > Nthr. ~ • The profile shapes of & Ni E(z)/p Non-unif. ?

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