LAMPF 201. 25-MHz linac field distribution

Abstract

Retuning of the 201.25-MHz accelerator structure field distributions after the 1975 shutdown is described and final data are given for use in beam dynamics studies. Several improvements made in procedures included a different method for stopband closure check and a positive method for postcoupler clamping. We found that to obtain accurate results for the first tank we had to use a rigorous data reduction technique that included the removal of a "signature" due to the bead-pull string itself. Other special studies are reported, including the effects of vacuum, bead size, slug tuners, and a bead-pull method for measuring the cavity quality factor Q.