The Hollow Cathode
A study of the hollow cathode metal vapour laser discharge
... the cathode current density increases by several orders of ...the hollow cathode ...the cathode region of the discharge has only two parts; the dark space,' close to the cathode surface ...
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LIFE TESTING OF THE HOLLOW CATHODE PLASMA CONTACTOR FOR THE ProSEDS MISSION
... LIFE CYCLE REQUIREMENTS The number of cycles for the HCPC lifetime test was calculated based on a 12-day mission. Early in the mission, the HCPC will operate in a pulsed 60-second cycle, 30 seconds off and 30 seconds on. ...
6
Numerical simulation of the insert chemistry of the hollow cathode from the deep space 1 ion engine 30,000 Hrs life test
... University of Southampton, Southampton, SO17 1BJ, United Kingdom Using a model for the insert chemistry developed by the authors and based on the knowledge of the BaO – CaO – Al 2 O 3 ternary system the ELT discharge ...
8
Hollow cathode thrusters for all electric spacecraft
... VI. Conclusion The exact thrust mechanisms of the T6 hollow cathode have been debated for some time. Our results indicate that for high specific impulse the hollow cathode operates as a low ...
15
Hollow Cathode Lamp Frequently Asked Questions
... • Even the most carefully handled lamp will eventually fail to operate however, as the fill gas is absorbed into the internal surfaces of the lamp. In time, the pressure of the fill gas will fall to a level that can no ...
8
Experimental study of expanding hollow cathode discharges
... the hollow cathode effect, and the high plasma densities measured suggest that this is ...the hollow cathodes then diffuses into the expansion ...single hollow cathode in the ...
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Characteristics of cylindrical hollow cathode plasma jet
... hollow cathode plasma jet A low pressure pulsed DC hollow cathode plasma jet system has been ...pulsed hollow cathode plasma jet systems were developed due to their high ...
7
Probe and Emission Spectrometry Diagnostics in Hollow Cathode Magnetron
... Those electrons and ions which have initial axial veloci- ties are capable to leave the hollow cathode and to be distributed to a substrate. The plasma stream has a core with diameter of about 4 cm at a ...
9
Spectral emission analysis of a dc helium hollow cathode discharge
... cylindrical hollow cathode, from which the dependence of a fully developed hollow cathode effect on the discharge conditions may be determined and compared to those deduced through other ...
8
Theoretical and Experimental Investigation of Hollow Cathode Nitrogen Glow Discharge Plasma
... The double probes are made from a copper wire of radius 0.235 mm and length 6mm as well as insulated by capillary tube except 6 mm is inserted in to the plasma .The distance between the probes 12.1 mm and the probes ...
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Hollow Cathode and Low-Thrust Extraction Grid Analysis for a Miniature Ion Thruster
... miniature hollow cathodes were designed and built specifically for the MiXI ...the cathode has a strong effect on thruster ...the hollow cathode within the discharge before we position the ...
11
Q-switched laser as a source for Thomson scattering from a hollow cathode arc.
... switching action occurs close to the time for maximum gain. The application of a Q-switched laser system as a plasma diagnostic tool led to the choice of a passive switch. The characteristic control and pulse timing ...
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Dependence of some plasma parameters on ap in a dc helium hollow cathode discharge
... J. Fiz. Mal., Vol. 23, Nos. 1 - 4, 2002 O.H. Chin and C.S. Wong however, manifest almost constant temperature T f of 11.3 eV until 3 cm-torr before falling as ap is further increased. The temperatures at the side are ...
6
Plasma Particle Trajectory Study for a Device Combining Hollow Cathode Discharge and Non-Adiabatic Trap
... cylindrical hollow cathode discharge to which the magnetic field of the solenoid and Helmholtz coil is ...The hollow cathode can increase the ion- ization efficiency of the neutral gas by the ...
5
Effect of Nitrogen Gas Pressure and Hollow Cathode Geometry on the Luminous Intensity Emitted from Glow Discharge Plasma
... the hollow cathode entirely in one of them and approximately for three others as well as different in the shape, size and length of positive column , in addition to that also different in the Faraday dark ...
6
Performance of the FOS and GHRS Pt/(Cr)-Ne Hollow-cathode Lamps after their Return from Space and Comparison with Archival Data
... Pt-Ne hollow cathode ...the hollow cathode lamp from about 155 nm (instrumental cut-off) to about 400 nm using two different photomultiplier detectors and a ...
7
Thrust characterization of a T5 hollow cathode
... T5 cathode are shown to be promising at least after several tens of hours of ...the cathode initiated readily with less than 28V from the anode ...early cathode life, to start a discharge from a 28V ...
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Studies of hollow cathode He Cd lasers
... one cathode o ...e cathode w a l l , and one o f th e o b j e c t i v e s o f t h e rem a in d e r o f t h i s c h a p t e r i s to d e r i v e c r i t e r i a f o r cathode d e s ig n from t h e s o ...
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Ignition and extinction phenomena in helium micro hollow cathode discharges
... micro hollow cathode discharge (MHCD), there exist many different types of devices, which are working at atmospheric pressure: cathode boundary layer devices (CBL), through hole MHCD, plasma ...
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Plasma Surface Interactions in Hollow Cathode Discharges for Electric Propulsion
... actual hollow cathode operating under normal ...the cathode geometry and the high particle densities in the plasma prevent direct measurement of the surface ...the cathode dur- ing poisoning. ...
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