A 3‐Mev X‐band microtron (electron cyclotron) particularly suited for laboratory use in nuclear and electron physics is described. About twelve electron orbits, in operating modes representing energy gains per turn up to 255 kev, may be obtained. By means of a magnetic shield probe, electrons may be extracted from any orbit for external experiments. Final orbit currents of 10−7 av amp and x‐ray yields of 0.5 r/min at 10 cm are obtained. Ellipsoidally shaped sealed‐off glass microtron tubes are under development.

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