SCATTERING RADIATION INVESTIGATION AT THE ROSSENDORF CYCLOTRON Y-120-1 (in German)
In the present article, after a brief description of the measurement methods, the resuits of scattering radiation studies at the Rossendorf cyclotron are reported. Errors in the utilization of neutron scintillators were indicated of some measurements in neutron fields of various energies. By utilization of the RBW factor 10 for fast neutrons, its contribution to the total dose output given in rem units was determined as greater than 10%. The thermal neutron 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 jorning 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 srxlimbed 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 dis component, which developed by moderation of the fast neutrons, is less than 1%. The ratio of the components of fast neutrons and the gamma radiation is always less dependent on the energy of the accelerated particle. Therefore, the routine radiation protection control can be limited to gamma dose output measurements. If the ion beam is deflected from the circular orbit and led to a target chamber, deflector and dees are shown to be the principal radiation sources. (tr-auth)
- Research Organization:
- Zentralinstitut fur Kernphysik, Rossendorf, Ger.
- NSA Number:
- NSA-16-028237
- OSTI ID:
- 4812008
- Journal Information:
- Kernenergie (East Germany), Vol. Vol: 5; Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- Country unknown/Code not available
- Language:
- German
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BEAM OPTICS
BEAMS
CHARGED PARTICLES
CONTROL
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DEFORMATION
ELECTRODES
ENERGY
ERRORS
FAST NEUTRONS
GAMMA RADIATION
ION BEAMS
MEASURED VALUES
MODERATORS
NEUTRON BEAMS
NEUTRON DETECTION
ORBITS
RADIATION DOSES
RADIATION PROTECTION
RADIATION SOURCES
RADIATIONS
SCATTERING
SCINTILLATION COUNTERS
SLOWDOWN
TARGETS
THERMAL NEUTRONS
VESSELS