摘要:
A multi-gap gradient-grid thyratron in which the discharge gaps are defined between a succession of gradient grids positioned between the anode and the control grid, the gradient-grids being alternately of the long and short type to maintain good insulating between gadient-grids while reducing the size of the thyratron.
摘要:
A hollow cathode capable of self-heating by back ion bombardment to a thermionic emission temperature axially discharges therefrom an ionized plasma of an ambient gas such as xenon. Electrons are axially or radially extractable from the plasma by an anode. A voltage is applied to a keeper electrode disposed between the cathode and anode to sustain plasma discharge of the gas between the cathode and keeper electrode. A control electrode is disposed between the keeper electrode and the anode. Application of a positive voltage (relative to the cathode) to the control electrode causes the plasma discharge to extend from the cathode to the anode, thus closing the switch. Application of a negative control electrode voltage, or simply returning the control electrode to cathode potential, causes the plasma discharge to retract back to the area of the keeper electrode, thereby opening the switch.
摘要:
Electron emissive material is applied to a line cathode by surrounding the cathode with cylinders at the locations where deposition of the material is desired and voltage biasing the cylinders positive with respect to the line filament for a prescribed time.
摘要:
An electric incandescent lamp comprising an axially extending filament in a tubular vitreous envelope has improved filament supports of wire whose outer turns are formed as hexagonal loops comprising straight segments with angles between successive segments. The sharp bends at the angles decrease the springback and unwinding of the support when it is released from the mandrel, so that variations in support loop diameter with wire tension and size are reduced. The support may be fabricated through a new method and apparatus on a forming mandrel by engaging a wire in a slot in an exposed end face simulating a shallow helicoid. As the mandrel revolves, at least one full turn is wound around its periphery (which may be hexagonal) to form the outer envelope-engaging loop. The wire is then bent radially inwards at the shoulder of the projecting portion of the helicoid face to wind filament-engaging turns around the filament and wire mandrel which extend through an axially aligned aperture in the forming mandrel. The formed support anchored to the filament is then stripped laterally off the exposed end face of the mandrel.
摘要:
A discharge tube arrangement, for example, a thyratron, in accordance with the invention has a first electrode arranged co-axially about a second electrode. Thus, in a thyratron, the anode may surround the cathode or vice versa. The envelope may be tubular having an aperture at its center. The discharge tube arrangement is constructed such that it is capable of being added to another such arrangement. A plurality of such arrangements may be added together to produce, for example, a thyratron capable of large current conduction.
摘要:
A gap switch includes an insulated vessel with hydrogen gas therein. A pair of directly-opposed electrodes cover two open end portions of the vessel. The two electrodes protrude into the interior of the vessel. A trigger pin with insulating material around it is within one of the electrodes and receives a pulsed voltage which thereby induces a discharge between the electrodes.
摘要:
A thyratron comprises an anode and control grids between which is located a double layer screen grid. Thermionic cathode material is inserted in an aperture in the part of the screen grid furthest from the anode, and in operation this is heated to the required temperature by hot plasma which surrounds it, thus eliminating the need for a cathode heater.