Researches on the Double Cathode Effect†

Influence of a magnetic field on the cathode fall space in a discharge with a cylindrical hollow cathode

“…It is worth noting that our studies have brought to light avariation of sheath thickness similar to that known for ordinary glow discharges and in contrast to results for doubie cathode discharges (Giintherschulze 1930, Badareu andPopescu 1958). which shou that the thickness of the cathode fall space does not vary with the discharge paraineters u~ider the conditions of the hollow cathode effect.…”

Collision and diffusion in microwave breakdown of nitrogen gas in and around microgaps

“…From Iza and Hopwood 12 (computed from Figure 8 in Ref. 12) one can conclude a minimum threshold breakdown electric field for air around 3 Torr and near 900 MHz of about 3.3x10 6 V/m inside a 45 m gap, and about 8.3x10 5 V/m inside a 120 m gap.…”

The DC gas discharge structure as a thermodynamic minimum

“…However, this does not explain why the discharge presents a negative impedance behaviour. From the work of Badareu and Popescu (1966), we can recall the following about the change in the ionization integral L = J a ( E ) d s due to space charge development. Let Eo he the Laplacian uniform field.…”

“…The basic threshold mechanism was proposed long ago by Townsend, who promoted two coefficients 01 and y, the coefficient of electron ionization and the secondary emission coefficient respectively. From these coefficients, the threshold potential V, for a self-sustained conduction through a gas between parallel plates is inferred (Von Engel 1965, Llewellyn Jones 1966, Badareu and Popescu 1966) for various values of the product Nd, where N is the gas number density and d is the gap distance. The plot of Vt(N,d) is the Paschen curve and its minimum is the Paschen minimum.…”