Results 271 to 280 of about 11,337 (309)

Hollow Cathode Arcs

1974
Publisher Summary This chapter provides an overview of hollow cathode arcs (HCA). Hollow cathodes have been used for some years in different discharge devices, working under varying conditions in widely extended ranges. All of these devices have one common feature: the cathode presents a hollow cavity, enclosed or at least partially bound by walls ...
Jean-Loup Delcroix, Armando Rocha Trindade   +1 more
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Effect of aging the hollow cathode by sputtering on the analytical precision of the hollow cathode discharge emission source

Analytical Chemistry, 1992
Sputtering changes the analytical performance of the hollow cathode as an emission source. Proper conditioning (aging) of the hollow with sputtering greatly improves precision. Conditioning decreases the blank emission signal and changes the shape of the hollow.
J L, Tseng, J Y, Kung, J C, Williams, S T, Griffin   +3 more
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On the Hollow Cathode Effect†

Journal of Electronics and Control, 1964
Abstract In this paper the hollow cathode effect is discussed in connection with the derivation of some simple laws which relate the current density, j, the gas pressure, p, and the current amplification factor, q. Thus one may conclude that, under the conditions of a fully developed hollow cathode effect, the product I2p does not depend on the gas ...
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A Plasma Stopper in a Hollow Cathode

Instruments and Experimental Techniques, 2002
A cap with a hole was mounted on the top of a cylindrical hollow cathode. The hole diameter ranged from 10 to 90% of the inner diameter of the hollow cathode. As a result, a plasma “stopper” was formed in the cathode cavity near the hole. The stopper hindered the plasma-forming gas flow from the cathode cavity into the vacuum chamber.
G. G. Sikharulidze, A. E. Lezhnev
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Miniature hollow cathode discharges

International Conference on Plasma Sciences (ICOPS), 1993
Summary form only given, as follows. Reducing the cathode hole diameter to about 100 /spl mu/m makes it possible to extend the pressure range for hollow cathode discharge operation to atmospheric pressure. For a submillimeter hollow cathode discharge in neon (at 100 Torr) it was shown that the flow of material in the cathode transforms the originally ...
K.H. Schoenbach, R.P. Joshi
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A Study of Hollow Cathode Discharge Characteristics

AIAA Journal, 1970
The operation and performance of small-orifice hollow cathodes for use in electron bombardment ion thrusters is described. Using mercury propellant, vaporized either in a small boiler or by a heated porous plug, cathodes have been operated in both a simple test facility and in an ion thruster.
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Hollow Cathode Discharge Devices

1970
Many types of devices have been used as fine-line sources for spectroscopic investigation. Arcs, Geissler tubes, radio-frequency electrodeless discharge tubes, high pressure discharge devices, atomic beams and hollow cathode devices have all been used to study hyperfine line structure. However, no other source has been used as extensively as the hollow
J. C. Burger, W. Gillies, G. K. Yamasaki
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Resonant Cavity Hollow Cathode

41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2005
The design and operation of a microwave plasma electron source in the form of a resonant cavity are described. Current-voltage characteristics recorded with a flat plate anode are presented and compared to those obtained with a thermionic hollow cathode.
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Hollow cathodes for arcjet thrusters

19th International Electric Propulsion Conference, 1987
In an attempt to prevent exterior spot emission, hollow cathode bodies and orifice plates were constructed from boron nitride which is an electrical insulator, but the orifice plates melted and/or eroded at high interelectrode pressures. The most suitable hollow cathodes tested included a refractory metal orifice plate in a boron nitride body, with the
CRAIG LUEBBEN, PAUL WILBUR
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Hollow-cathode HCN laser

Quantum Electronics, 1999
An abrupt change in the discharge current in a submillimetre HCN laser was observed at the instant of the appearance of the laser radiation. An evacuated tantalum can be used as the negative electrode.
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