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Additional info for USPAS - Accelerator Magnet Engineering [presentation slides]
Sample text
It is customary for the Hipot test to apply a factor of safety of 4 or 5 to the expected peak voltage . Thus, the insulation rating to ground should be about 5 kV. Since the voltage is split between the two coil halves, that Hipot test is typically 3 kV. Since the total voltage across the coil is distributed among the turns, the turn to turn insulation is tested at 70V. This requires a dynamic test rather than a static one to induce the voltage between the turns. USPAS January 2001 Note: The dielectric strength of Kapton film is about 5 kV/mil.
6 Cold mass cooling requirements, continued The type of cooling indicated by the heat flow path in the figure is called “diffusion cooling”. That is the interior parts of the cold mass including the coils, collars and yoke are cooled by a radial heat flow between the beam tube and the bypass holes. Diffusion cooling is adequate to take care of the ambient heat load. For a 17 m long SSC dipole the ambient heat load is about 1 W. However since the magnet is long and the coils are covered with a low conductivity Kapton insulation, this type of cooling may not be adequate for the case of synchrotron radiation load which comes in through the beam tube.
8 Cost Effective Design A high energy particle accelerator will contain many similar magnets. The number of dipoles required in the arcs of some accelerators are listed below. Accelerator Number of Arc dipoles Tevatron 774 HERA 416 SSC 7964 RHIC 264 LHC 1792* * 2 coils per yoke The mechanical design should take into account the necessity to minimize the cost of the magnets. This is particularly important since funding for accelerator projects unusually come from non-defense scientific budgets. Thus, cost reduction methods should be followed, some of which are indicated below: 1.