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.

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.

Massenspektrometrische Untersuchungen über die neutralen Teilchen im negativen Glimmlicht einer zylindrischen Hohlkathoden-Entladung in N2 / Mass spectrometric study of the neutral particles in the negative glow of a cylindrical hollow cathode discharge in N2

1973 ◽  
Vol 28 (9) ◽  
pp. 1397-1404
Author(s):  
Tilmann D. Märk
Keyword(s):  
Hollow Cathode ◽  
Discharge Current ◽  
Mass Spectrometric Study ◽  
Reaction Rate Constant ◽  
Hollow Cathode Discharge ◽  
Negative Glow ◽  
Fast Electrons ◽  
A Value ◽  
Dissociation Degree ◽  
Cylindrical Hollow Cathode

Detailed studies have been made of the number densities of the neutral constituents of the negative glow of a hollow cathode discharge (with currents up to 120 mA) produced in N2 at various pressures (0.2 <C p0 < 2.0 Torr).The dissociation degree XN of N2 in the presence of the discharge was determined as a function of gas pressure p0 and discharge current Id and from these data an empirical expression was derived XN p0 = C Id , with C = 7.6·1014 particles cm-3·A-1. Using this result a value of the density [es] of the fast electrons present in the negative glow as a function of discharge current was calculated to [es] = 5.9·107 Id. Also an estimated reaction rate constant was obtained for the fast bimolecular process N + NO→N2+0 (3.3·10-11 cm3s-1).Relative ionization efficiency curves at mass 28 and mass 14 in the presence and absence of the discharge yielded values of the ionization and appearance potential for N2+e→N2++2e (15.55 ± 0.1 eV), N2+e→N++N+2e (23.65±0.2 eV) and N+e→N++2e (14.35 ± 0.4 eV).

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

The Research of Atmospheric Pressure Cold Plasma Jet Generated by Auto-Excited-Pulsed DC Discharge

2014 ◽  
Vol 989-994 ◽  
pp. 1200-1203
Author(s):  
Ye Lin Hu ◽  
Qiu Wang ◽  
Zhao Quan Chen
Keyword(s):  
Power Supply ◽  
Discharge Current ◽  
Atmospheric Pressure ◽  
Cold Plasma ◽  
Argon Plasma ◽  
Plasma Jet ◽  
Pulse Frequency ◽  
Dc Discharge ◽  
Pulsed Dc ◽  
Piezoelectric Ceramic Transformer

In order to obtain stable cold plasma jet under atmospheric pressure condition, we designed a high-voltage DC power supply based on the principle of multilayer piezoelectric ceramic transformer (MPT). At the same time, we developed a cold plasma jet device that its shape is similar to the gun structure. The total weight of device, including the power supply and the generator, is less than 500 g. In the experiments of argon plasma under atmospheric pressure, current–voltage measurements show that the discharge actually appears periodically pulsed with a frequency of about 30 kHz. The discharge current has a pulse-width that is about 100 ns, while its peak value reaches about 32 mA. The maximum length of the plasma is about 3 cm. The further study showed that the discharge current pulse frequency is determined by the ion drift mechanism.

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