The First High-Luminosity Insertion in the ISR

One of the means proposed to increase the luminosity in storage rings, a so-called low-ß insertion, has been put successfully into operation in the Intersecting Storage Rings (ISR). By installing five quadrupoles in each ring around one intersection, a reduction of beam height by a factor 2.3 has been measured, and, with proper matching, the perturbation to the rest of the machine was found to be negligible. With circulating beams of 20 A and 24 A a luminosity of 2.11 x 1031 cm-2s-1 has been achieved. This paper reports the results of tests conducted, compares them with the theoretical forecasts, and gives a short description of the hardware used.