Precise Magnetic Fields in Momentum Analyzing System Establishment of Precise Magnetic Fields in the Momentum Analyzing System at Slac

Precise magnetic fields a r e necessary to achieve high-quality particle beam-transport in the SLAC beam switchyard. A discussion of the methods of magnetic measurements associated with testing and establishing these fields is presented. These measurements and some of the important results obtained a r e described. In order to satisfy the criteria placed on the transport systems each magnet was measured and the critical [magnets of the transport system were selected for placement in the beam switchyard on the basis of several of their measured chaTacteristics. A description of the selection procedure is presented, and the effects of the individual magnet differences a r e discussed. Details of measurement techniques and the resulting procedures which a r e used for setting up the beam switchyard for a particular momentum a r e given.