The Relativistic Heavy Ion Collider (RHIC) consists of two rings with cryogenic magnets at a 4.5K operating temperature. Control of positions of the dipole and quadrupole cold masses (iron laminations) and the beam position monitors (BPM's) during production and installation is presented. The roll of the dipoles is controlled by a combination of rotating coil measurements with the surveying measurements. The center of the quadrupole magnetic field is obtained by direct measurement of the field shape within a colloidal cell placed inside the quadrupoles. Special attention is given to the triplet quadrupole alignment and determination of the field center position.
The kicker magnets for the AGS Booster synchrotron are to be operated in an ultra-high vacuum environment, and must not serve as sources of residual gas. After vacuum bakeout of a magnet's ferrite core block at 900" C, and a bakeout of a second core block at 550" C, it was observed that the blocks had become electrically conductive and thereby unsuitable for magnet use.
Its accelerating cavities are sveep-tuned by varying the permeabilitv of ferrite core rings vithin the cavities. Core material selection criteria and evaluation are discussed Measure-Tents of permeability, loss and perrni tt i" : ty .v.c presented.
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