Description: The multipole content of the magnetic field in accelerator superconducting magnets built with a cos theta current distribution inside an iron yoke is determined by the placement of the individual current-carrying turns in the coil, by the location of the coil inside the iron yoke and by the amount of iron saturation at high field. Differences in these parameters cause the multipole content to vary from magnet to magnet leading to possible undesirable effects on beam behavior. Experience has shown that conductor placement errors, due to unavoidable size and placement differences in the conductor and current blocks, are the dominant cause of the observed variation in the multipole content of supposedly identical magnets. These variations were studied in existing magnets in order to see how similar variations might affect the performance of the SSC.
Date: January 1, 1984
Creator: Willen, E.
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