Effect of cathode surface state on the characteristics of pulsed hollow-cathode glow discharges

1999 ◽  
Vol 44 (5) ◽  
pp. 497-500 ◽  
Author(s):  
N. V. Gavrilov ◽  
S. E. Romanov
Keyword(s):  
Hollow Cathode ◽  
Surface State ◽  
Cathode Surface ◽  
Glow Discharges

Experimental investigations of glow discharges in hollow cathode geometries at low pressure

2005 ◽  
Vol 33 (2) ◽  
pp. 384-385 ◽  
Author(s):  
T. Callegari ◽  
F. Gegot ◽  
L.C. Pitchford ◽  
J. Galy ◽  
J.P. Boeuf
Keyword(s):  
Hollow Cathode ◽  
Low Pressure ◽  
Experimental Investigations ◽  
Glow Discharges

scholarly journals Influence of Electron Injection on the Characteristics of a Hollow Cathode Glow Discharge

2021 ◽  
Keyword(s):  
Glow Discharge ◽  
Hollow Cathode ◽  
Discharge Current ◽  
Cathode Surface ◽  
Electron Flow ◽  
Glow Discharge Plasma ◽  
Cathode Cavity ◽  
Main Discharge ◽  
Dark Space ◽  
Gas Pressures

The article presents the results of experimental studies of a glow discharge with a hollow cathode in helium and argon gases using an auxiliary discharge as an electron emitter. The authors proposed to make the electrode common for both discharges in the form of a cylindrical metal mesh. The advantage of this design is explained as follows. The connection between the discharges is carried out through holes in the grid with a geometric transparency of 0.2, which makes it possible not only to smoothly control the glow discharge current, but also to enhance the discharge current. Plasma is known to be one of the most efficient electron emitters; however, its use as a cathode in devices with a glow discharge at low gas pressures is complicated by the fact that a grid with small holes is required to separate the electron flow from the plasma, and it is impractical to use such a system in view of low mechanical strength of the grid Since the hollow cathode works effectively at low gas pressures, the release of an electron flux from the plasma of some auxiliary discharge is possible with much larger holes in the grid separating the plasma and the hollow cathode cavity. In this case, the grid can be made such that it can withstand sufficiently high thermal loads and can operate in typical discharge modes with a hollow cathode. The injection of electrons into the cathode cavity of the glow discharge changes the radial distribution of the glow intensity, the width of the cathode dark space, and other parameters of the plasma in the cathode cavity. The influence of electrons penetrating from the auxiliary discharge into the cathode cavity of the main discharge becomes significant when the current of these electrons is comparable to or exceeds the current of electrons leaving the grid cathode surface as a result of γ-processes. In parallel with the measurement of the optical and electrical characteristics of the hollow cathode glow discharge plasma, measurements of the electron concentration were carried out by the microwave sounding method. The entire current of the auxiliary discharge penetrates into the cavity of the main discharge; however, after acceleration in the cathode dark space, the electrons penetrating from the auxiliary discharge ionize gas atoms and noticeably increase the current of the main discharge. Additional ions formed due to the ionization of the gas by the injected electrons knock out new electrons from the cathode surface, which makes it possible to increase the discharge current.

Anomalous Broadening of Balmer H[sub α] Line in Aluminum and Copper Hollow Cathode Glow Discharges

2008 ◽  
Author(s):  
N. M. Šišović ◽  
G. Lj. Majstorović ◽  
N. Konjević ◽  
Marco Antonio Gigosos ◽  
Manuel Ángel González
Keyword(s):  
Hollow Cathode ◽  
Glow Discharges

Optogalvanic Measurement of the Electric Field inside the Cathode Fall Region of Neon Hollow Cathode Discharge

1989 ◽  
Vol 43 (2) ◽  
pp. 245-248 ◽  
Author(s):  
Norihiro Ami ◽  
Akihide Wada ◽  
Yukio Adachi ◽  
Chiaki Hirose
Keyword(s):  
Glow Discharge ◽  
Electric Field ◽  
Hollow Cathode ◽  
Stark Effect ◽  
Cathode Surface ◽  
Hollow Cathode Discharge ◽  
Cathode Fall ◽  
Negative Glow ◽  
Optogalvanic Spectroscopy ◽  
The Difference

Radial distribution of the electric field in the cathode fall region of neon hollow cathode discharge has been derived through the observation of the linear Stark effect of the nd′ ( n = 10–12)-3 p′[½]1 transitions by two-step optogalvanic spectroscopy. The field strength was found to decrease monotonically from the cathode to the negative glow. The depth of the cathode fall region was 0.80 ± 0.05 mm, and the electric field at the cathode surface was 5.2 ± 0.2 kV/cm*—values which compare with the reported values of around 3–4 mm and 3–4 kV/cm in the cathode fall region of Ne glow discharge. The difference and similarity in the values of derived parameters are discussed.

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