TEMPERATURE OF HEAVY-CURRENT CYLINDRICAL HOLLOW CATHODE

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-229-C7-230
Author(s):  
N. N. Rykalin ◽  
A. V. Nikolaev ◽  
A. P. Borzhov
Keyword(s):  
Hollow Cathode ◽  
Cylindrical Hollow Cathode

Experimentelle Bestimmung innerer und äußerer Parameter des negativen Glimmlichtplasmas einer zylindrischen Hohlkathodenentladung in Argon / Plasma Diagnostic Measurements in the Negative Glow of a Cylindrical Hollow Cathode Discharge

1972 ◽  
Vol 27 (10) ◽  
pp. 1425-1433 ◽  
Author(s):  
F. Howorka ◽  
M. Pähl
Keyword(s):  
Hollow Cathode ◽  
Argon Plasma ◽  
Cathode Current Density ◽  
Plasma Diagnostic ◽  
Negative Glow ◽  
Dc Discharge ◽  
Pressure Discharge ◽  
Glow Plasma ◽  
Langmuir Probe Measurements ◽  
Cylindrical Hollow Cathode

Abstract The negative glow plasma of a cylindrical hollow cathode dc discharge (0.05 - 1 Torr Argon, 1-30 mA) is investigated as to the position of the glow edge, the axial dependence of the cathode current density, the axial and radial potential distributions, the density and energy of electrons (from Langmuir probe measurements) as dependent on pressure, discharge current and position, etc. It is found that two groups of electrons exist whose energies are < 0.5 eV ~ 3 eV and the ratio of their denisties being 3 up to 20. A phenomenological explanation is given for the relatively high denisty of the fast group, The results are compared with those of other auhors concerning hollow-cathode and linear discharges.

scholarly journals The influence of magnetic field and cathode dimensions on plasma characteristics in hollow cathode system

2018 ◽  
Vol 16 (38) ◽  
pp. 26-34
Author(s):  
Qusay Adnan Abbas
Keyword(s):  
Magnetic Field ◽  
Hollow Cathode ◽  
Emission Intensity ◽  
Working Pressure ◽  
Maximum Value ◽  
Dc Discharge ◽  
Plasma Characteristics ◽  
Intensity Study ◽  
Cylindrical Hollow Cathode ◽  
Image Analyses

Experimental study on the effect of cylindrical hollow cathode, working pressure and magnetic field on spatial glow distribution and the characteristics of plasma produced by dc discharge in Argon gas, were investigated by image analyses for the plume within the plasma. It was found that the emission intensity appears as a periodic structure with many peaks appeared between the electrodes. Increasing the pressure leads to increase the number of intensity peaks finally converted to continuous form at high pressure, especially with applied of magnetic field, i.e. the plasma is more stable with the presence of magnetic field. The emission intensity study of plasma showed that the intensity has a maximum value at 1.07 mbar pressure and decrease with more pressure.

scholarly journals Über den Fallraum in einer zylindrischen Hohlkathode / On the Cathode Fall in a Cylindrical Hollow Cathode

1972 ◽  
Vol 27 (10) ◽  
pp. 1417-1425
Author(s):  
H. Helm ◽  
F. Howorka ◽  
M. Pähl
Keyword(s):  
Hollow Cathode ◽  
Electric Field Distribution ◽  
Density Ratio ◽  
Cathode Fall ◽  
Carrier Generation ◽  
Current Voltage ◽  
Electrons And Ions ◽  
Order Of Magnitude ◽  
Radial Model ◽  
Cylindrical Hollow Cathode

Abstract The electric field distribution in the cathode fall and the current-voltage characteristic of a cylindrical hollow cathode are calculated on a purely radial model. The theoretical characteristic is compared with results measured on a H2-and Ar-discharge. From the experimental data, the current density ratio of electrons and ions on the cathode can be calculated. This ratio appears in the correct order of magnitude only if the carrier generation in the cathode fall is taken into account. Comparisons are made with the results of linear theories.

Electric field solution of cylindrical hollow cathode

2010 ◽  
Author(s):  
Gook-Hee Han ◽  
Sang-Ho Han ◽  
Yun-Hee Cho ◽  
Hyun-Kyo Lim ◽  
Dong-Jun Jin ◽  
...  
Keyword(s):  
Electric Field ◽  
Hollow Cathode ◽  
Field Solution ◽  
Cylindrical Hollow Cathode

Massenspektrometrie am negativen Glimmlicht einer zylindrischen Hohlkathode / Mass Spectrometric Studies of the Negative Glow of a Cylindrical Hollow Cathode Discharge

1972 ◽  
Vol 27 (4) ◽  
pp. 678-692 ◽  
Author(s):  
M. Pähl ◽  
W. Lindinger ◽  
F. Howorka
Keyword(s):  
Hollow Cathode ◽  
Reaction Scheme ◽  
Ion Source ◽  
Hollow Cathode Discharge ◽  
Ion Currents ◽  
Negative Glow ◽  
Probe Diameter ◽  
Sampling Orifice ◽  
Sampling Probe ◽  
Cylindrical Hollow Cathode

Abstract Positive ions were extracted from the negative glow (NG) of a cylindrical hollow cathode discharge (h.c.d.) through a plane sampling probe (diameter 1 mm, orifice dia. 50 [xm, Molyb-denum) and analyzed in a 60° mass spectrometer. The discharge was operated in pure Argon with an admixture of about 0.1% of H20. The principal ions were Ar+, Ar++,r2+, ArH+ , H20+ and H3O+ . The individual ion currents were measured as functions of the probe potential U\>, at dif-ferent discharge currents (2 - 7 mA) and of the gas pressure (0,05 - 0,5 torr). The reaction scheme for the production and conversion of these ions in the NG could be established. In general, the ions were extracted from the axis of the h.c.d. When the sampling probe was mounted excentrically (3 mm out of the axis), the ratio of secondary to primary ions was higher in the axis. At probe potentials above +15 v referred to anode no ions from the NG reached the probe, but electrons were accelerated so that ionization of the neutral gas could arise in and behind the orifice. The Ar++ current as a function of Ub together with other results suggested the presence of very fast electrons (energy > 100 v) in the sampling orifice. They could be identified as electrons from the cathode fall region which were scattered into the orifice. Studies of the ion currents from Ar-H2 mixture proved the sampling probe suitable as an electron impact ion source.

Cylindrical hollow cathode as a source of negative ions

1978 ◽  
Vol 28 (1) ◽  
pp. 101-106 ◽  
Author(s):  
Ingrid Kuen ◽  
Franz Howorka ◽  
Robert N. Varney
Keyword(s):  
Hollow Cathode ◽  
Negative Ions ◽  
Cylindrical Hollow Cathode
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