Strahlentransformator mit zwei gegenläufigen Elektronenströmen.

摘要

652,247. Magnetic induction accelerators. AKT.-GES. BROWN, BOVERI, & CIE. Aug. 6, 1947, No. 21442. Convention date, Aug. 6, 1946. [Class 39 (i)] In a magnetic induction accelerator having opposed electron streams the phase relationship between which corresponds with that of the supply voltage used for producing the accelerating fields, means are provided whereby the final electron velocity of each beam is separately adjustable either by control of the electron current or of the time during which the beam is exposed to the field. A betatron 1, Fig. 1, in which X-rays 5 are generated at an anticathode 3, has separate cathodes 21, 211, the electron streams from which can be separately controlled through separate circuits, one of which is shown, and comprises phase-shifter 10 adapted to discharge condenser 9 through the discharge tube 8, whereby the cathode 211 is momentarily biassed with respect to earth. The cathodes are heated through transformers 6 supplied through a variable resistance 7. In modifications, the impulses may be applied to control grids and each tube 8 may energize a relay, connected in its anode circuit, Fig. 3 (not shown), to switch the condenser 9 into the appropriate grid circuit. In Fig. 2, the electron streams from separate cathodes 21, 211, are controlled by grids 141, 1411 and members 171, 1711 are biassed with respect to an earthed member 18 to modify the direction of the streams, and thereby the time they remain within the accelerating field. The electromagnetic field may be increased or weakened to determine the moment when each electron stream is to be ejected by a supplementary winding 38, Fig. 4, the impulses through which for each stream is determined by phase-shifters 31, 32 operating through thyratrons 33, 34 to discharge the condenser 37.