Beam Switchyard Design and Operation

As previously discussed, the accelerator is capable of providing interlaced electron and/or positron beams at various pulse rates, currents, and energies. The beam switchyard (BSY) is designed to separate the various beams coming from the accelerator and deliver them to the appropriate experimenters' locations. A beam transport system consisting of pulsed and direct current magnets channels the beam through the switchyard to the various experimental setups on,a pulse-to-pulse basis. This transport system and the associated instrumentation provides momentum analysis and control of the high-power beams up to the points where they are dissipated in targets or beam dumps. Figure 5-25 shows the arrangement of the research structures and experimental setups; Fig. 5-2 is an aerial view of the research area. Accelerator beams are delivered to two shielded and physically separated buildings known as end stations A and B. These buildings are located in a large research area which is available for the erection of other permanent and temporary buildings containing bubble chambers, spark chambers, and counting equipment. Three spectrometers are available in end station A. The central C-beam system transports the accelerator beam to targets and dumps within the beam switchyard housing, providing secondary beams for a bubble chamber and other experimental equipment located in the central part of the research area. Present beam arrangements are capable of delivering electron, photon, positron, /^-particle, rc-meson, and K-meson beams to various experimental setups. Considerable flexibility has been provided in the BSY for future beams and experimental facilities. Figures 5-23 and 17-1 through 17-3 show the locations of the equipment and beams in 'the switchyard. Provisions have been made for future development of a gamma-ray beam which could operate parasitically off the A system. In addition, the tunnel configuration provides