TWO-BUNCH OPERATION OF THE KEKB LINAC FOR DOUBLING THE POSITRON INJECTION RATE TO THE KEKB RING

摘要

A high-intensity, two-bunch acceleration scheme in the primary electron beam for positron production has been introduced at the KEKB linac for doubling the positron injection rate to the KEKB ring. The KEKB linac has until now injected single-bunch positron beams with an injection rate of about 1.4 mA/s (50 Hz) into the KEKB ring, requiring several minutes of topping-off time. Therefore, two-bunch operation could eventually halve the injection time, resulting in an efficient accumulation of the integrated luminosity of collisions. The results of two-bunch operation tests at the linac are reported.