Abstract:
A device for stabilization of the electron beam current comprises a sensor (12) of the deviation of the electron beam current from a preset value, a sawtoothed voltage former (14) which is connected to the high-voltage transformer (2) of an acceleration voltage source and which provides for a periodical sawtoothed voltage the slight slope sections of which are started to be formed at those times when the voltage on the transformer (2) passes through zero-point, an adder (13), one of the inputs of which is connected to the output of the sensor (12) and the other input to the output of the former (14), a threshold element (15) connected to the ouput of the adder (13), a differentiating element (16) connected to the output of the threshold element (15) to ensure the forming of electric driving pulses at the times of intersecting the threshold level of the threshold element (15) by the slight slope sections of the sawtoothed voltage at the output of the adder (13), alight radiation source connected to the output of the differentiating element (16) to ensure the transformation of the electric driving pulses into light ones, and a photothrystor (11) which is controlled by the light impulses and which is connected to the primary winding circuit of a filament transformer (5) supplied from one of the secondary windings of the high-voltage transformer (2).
Abstract:
An arc treatment device (14) comprises: a. An arc detection device (21) detecting an arc being present in a plasma chamber (30); b. An arc energy determination device (22) for determining an arc energy value which is a value corresponding to the energy supplied to the plasma chamber (30) while the arc is present in the plasma chamber (30); c. A break time determination device (24) for determining a break time from the determined arc energy value.
Abstract:
An arc treatment device (14) comprises: a. An arc detection device (21) detecting an arc being present in a plasma chamber (30); b. An arc energy determination device (22) for determining an arc energy value which is a value corresponding to the energy supplied to the plasma chamber (30) while the arc is present in the plasma chamber (30); c. A break time determination device (24) for determining a break time from the determined arc energy value.
Abstract:
Die Erfindung betrifft ein Handgerät (1) und ein Verfahren zur Plasmabehandlung von Werkstücken (50). Das Handgerät (1) umfasst ein Gehäuse (60) zur Aufnahme einer Plasmaquelle (5). Der Plasmaquelle (5) wird von einer Gasversorgungseinheit (10) ein Gasstrom (13) zugeführt. Ferner ist eine Elektrodeneinheit (2) in der Plasmaquelle (5) angeordnet und über eine elektrische Leitung (21) mit einer Spannungsquelle (20) verbunden, so dass ein Plasmastrom (3) erzeugt werden kann. Der Plasmastrom (3) ist durch eine Austrittsdüse (4) des Gehäuses (60) auf ein Werkstück (50) richtbar. Ferner umfasst das Handgerät (1) ein Sensorsystem (40) zur Erhebung von Betriebsparametern (100). Das Sensorsystem (40) umfasst wenigstens einen Bedienersensoreinrichtung (41) zur Erhebung einer Position (101) eines Bedieners (70) relativ zur Plasmaquelle (5) und wenigstens einen Drucksensor (42) zur Erhebung eines Drucks (102) in der Gasversorgungseinheit (10). Eine Einrichtung (30) des Handgeräts (1) ist mit dem Sensorsystem (40) zur synchronisierten Erfassung der erhobenen Betriebsparameter (100) über Datenleitungen (31, 32, 36) kommunikativ verbunden. Desgleichen ist zumindest die Spannungsquelle (20) mit der Einrichtung (30) verbunden und steuer- bzw. regelbar.
Abstract:
An electron beam apparatus having an electron analyzer (28) is achieved which can control the illumination lens system (22) by feedback without adversely affecting the imaging action even if a specimen (23) is positioned within the magnetic field of the objective lens. The apparatus has an energy shift control module (37) for controlling energy shift. On receiving instructions about setting of energy shift from the CPU (36), the control module (37) issues an instruction for shifting the accelerating voltage to a specified value to an accelerating-voltage control module (33) . The control module also sends information about the energy shift to an energy shift feedback control module (38), which calculates the feedback value and supplies information about corrections of lenses and deflection coils to a TEM optics control module (34) . The feedback value is multiplied by a corrective coefficient that can be calibrated.
Abstract:
Disclosed is an electron beam apparatus and method which can retain the state that minimizes the amount of water content contained at a gap between a high-voltage cable and a high-voltage introduction insulator to thereby prevent creation of high-voltage discharge and current leakage. The apparatus comprises a means for applying a high voltage to an acceleration electrode while eliminating electron release from an electron source and for detecting a change in an emission current corresponding to a change in an acceleration voltage at this time. In addition, the apparatus comprises a means for issuing a cautionary notice or warning when the change of this emission current exceeds a prespecified value. Further, the apparatus comprises a means for letting a dry gas flow in a gap portion between the electron gun's high-voltage cable and the high-voltage introduction insulator to thereby dehumidify said gap portion. With such an arrangement, it is possible to prevent high-voltage discharge due to an increase in water content of the gap portion and also instability of an electron beam due to a leakage current.
Abstract:
Installation pour le travail des métaux par faisceau d'électrons, comportant un canon à électrons (1), un ensemble transformateur-redresseur produisant une haute tension redressée et alimentant le canon, un tube à vide (28) disposé dans ce circuit et associé à des moyens (21) sensibles au courant qui y circule pour interrompre le passage de ce courant lorsque son intensité dépasse une valeur déterminée. b) Installation caractérisée en ce que la polarité positive du redresseur est reliée à l'anode (4) du canon par l'intermédiaire de la terre constituant le potentiel de référence, et en ce que le tube à vide (23) associé à ses moyens (21) sensibles au passage du courant, est disposé dans la liaison de la polarité négative du redresseur (19) à la cathode (3) du canon.
Abstract:
An arc treatment device (14) comprises: a. An arc detection device (21) detecting an arc being present in a plasma chamber (30); b. An arc energy determination device (22) for determining an arc energy value which is a value corresponding to the energy supplied to the plasma chamber (30) while the arc is present in the plasma chamber (30); c. A break time determination device (24) for determining a break time from the determined arc energy value.