Werner Hardt

Ultraslow Extraction (Status Report)

At the first Workshop in March 1979 1 first crude idea on ultraslow extraction were presented. This ripple insensitive method has been verified at the CPS and results were reported during the XIth International Conference on High-Energy Accelerators in July 19802. Since then, the transverse aspects have been pursued3,4 and the necessary hardware further developed.

The feasibility of accelerating polarized protons in the CERN‐PS and other strong focusing machines

A proposal was made in January, 1975, for a study on the possibility of accelerating polarized protons in the CERN‐PS. This is a report of the work performed and the conclusions reached, before the study was wound up. The following problems are discussed: improvements of the source, multi‐turn injection into the PS, a collector ring between the preaccelerator and the Linac, depolarizing effects in the PS, and in the transport lines. The conclusions at the end of 1975 were that we should aim for 12 GeV/c as maximum momentum in the first place, but remain hopeful about the possibility of attaining higher PS energies. The results are scaled to other machines to show that polarized protons in, for example, the SPS are unlikely.