NEW METHOD OF CONSTRUCTING A MULTILIMB MAGNET CORE OF A BETATRON
A construction method for multilimb magnet cores of round cross section is described without requiring mechanical treatment of the joining surfaces between the center limb and the short-circuit yoke. Transformer cores can be manufactured according to this method, too. A certain relation between induction in the exciting flux and the control field strength has to prevail in order to ensure the motion of electrons on the so-called nominal circle during the acceleration process. Deviations of electrons from the nominal circle occur by losses in the magnet core causing a phase shift of the control-field strength opposite to the field strength of the exciting current. In order to avoid the deviations mentioned, the magnet core has to be carefully and precisely manufactured. Such a core consists of one, two, or multilimb magnets; four or six short-circuit yokes are used mainly in multilimb designs, whereby the central limb should possibly be arranged in radial symmetric layers. These designs, however, show several disadvantages caused by their composite structure, by the connection of the short-circuit yokes to the round central limb, etc. The mechanical treatment of the joining points, for example, leads to the formation of fins and by this of short circuits, causing the afore-mentioned phase shifts. The construction method of multilimb magnet cores avoids the disadvantages of the mechanical treatment in the points of connection between central limb and yokes. The magnet core consists of an equally designed upper and lower part, connected by simple yokes. The upper respectively lower parts consist of a cylindrical central core composed of numerous sheet packs, and of the outer core. Each sheet pack is pressed and glued together into yokes or yoke parts by means of special devices. Using keys, the outer sheets of a sixlimbed core of a yoke part are bent by 30 deg . The keys remain on the spot after pressing and serve for the attachment of the winding. The pressing together of upper and lower parts to the yokes is done by means of special screws. The round central core limb is connected to a correspondingly developed pole piece. The air gap between pole pieces can be decreased by shim plates. The air gap of the magnetic core for the exciting field can be increased in the axial direction by adjustment of the central core parts. The tuning of the exciting field with the control field is necessary. The core design avoids the disadvantages of manufacture and facilitates adjustment, repair, and assembly. A 20 Mv betatron of the described core desrgn operates in the Physikalisch-Technisches Institute der Friedrich- Schiller-Universit-at in Jena (Physico-Technical Institute of the Friedrich- Schiller-University in Jena). (O-l-3)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-16-028235
- OSTI ID:
- 4783767
- Journal Information:
- Elektrie (East Germany) Supersedes Dtsch. Elektrotech., Vol. Vol: No. 4; Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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