Report on the ISR

During 1974, the period covered by this report, the ISR were in operation for 3500 h. Operational performance throughout the year has profited from the regular application of the methods developed at the end of 1973, viz. gradual compensation of the space-charge tune shift during stacking followed by fine tune corrections with the help of Schottky diagnostics. In addition, a further improvement of the pressure to values well below 10/sup -11/ torr average around the two rings has led to improved clearing of ionization electrons. Higher luminosities up to a maximum of 1.4*10/sup 31/ cm/sup -2/ s/sup -1/ (in all intersections) have been reached with the working line straddling 5th order resonances. (16 refs).