GB661247A - Betatron-started synchrotrons - Google Patents

Abstract

661,247. Magnetic induction accelerators. AKT.-GES. BROWN, BOVERI & CIE. July 18, 1949 [July 28, 1948], No. 18830/49. Class 39 (i). In a betatron-started synchrotron accelerator, separate supply sources are used for the excitation of the magnetic guiding field and of the magnetic accelerating field in the central core. An auxiliary winding in series with the excitation winding for the guiding field compensates the flux induced by it in the central core. For exciting the accelerating flux in the central core, a current of higher frequency is used than that for exciting the guiding flux. The excitation of the accelerating flux becomes effective when the guiding flux passes through zero. The transition from betatron to synchrotron operation does not involve saturation of the central core. In one embodiment, Fig. 1, the winding 9 for the accelerating flux surrounds one limb of an iron core 8<SP>1</SP>, magnetically separate from the iron core 1 for the guiding flux. The compensating winding 10 has the same number of turns as the winding 4 for the guiding flux. In another embodiment, Fig. 3, a single iron core 1 is provided, and the current pulses for producing the accelerating flux are injected into the compensating winding 10. The winding 10 has less turns than the winding 4 for the guiding flux, but may have an equal number, if an air gap is provided in the central core, or if the winding 10 is shunted by a resistance 21. These current pulses are supplied through an auto-transformer 16 and thyratrons 17, 17<SP>1</SP> which are ignited periodically when the guiding flux passes through zero under the control of a current transformer 20. The wave form of the current pulses may be varied by means of the resistance 22.