ZGS External Proton Beam

Extraction methods, diagnostic equipment, and external beam lines are described. By the use of special targets and magnet field shapes, we have extracted beam at energies between 4.0 GeV/c and 13.4 GeV/c. Slow and fast extractions have been accomplished with efficiencies greater than 30 percent and 50 percent, respectively. A parasitic beam has been extracted with 20 percent efficiency. Extracted beams of up to 7 × 1011 protons/pulse with a 2.2 s repetition rate have been obtained for a neutrino experiment. To date, spill durations from 40 ¿s to 500 ms have been achieved. A compact secondary emission detector having a very short radiation length has been designed and operated. The multiple scattering introduced into the beam by this chamber is less than 1/2 milliradian. TV systems with scintillators and sodium iodide matrices have been used to line up the beam. In the external beam line, three target stations have been set up. The first is for a neutrino experiment, the second station for three experiments, and at the third station there are two experimental setups.