Showing papers by "D.L. Friesel published in 1979"
TL;DR: In this article, a non-intercepting, charge sensitive, sampling beam phase probe, similar to the design developed for the 15 MeV injector cyclotron, was installed on the moveable south valley probe of the Indiana 200 MeV main stage.
Abstract: A non-intercepting, charge sensitive, sampling beam phase probe, similar to the design developed for the 15 MeV injector cyclotron, was recently installed on the moveable south valley probe of the Indiana 200 MeV main stage cyclotron. The probe permits continuous measurement of beam phase from inflection to extraction radius at beam intensities as low as 200 nanoamperes. The measured phase histories obtained show that small deviations from the predictions of our field mapping data are required for isochronous acceleration. The characteristics of the phase probe and the results of the beam phase measurements are discussed.
1 citations
TL;DR: In this article, a non-intercepting movable beam phase probe was used to study the relative beam phase variation during acceleration for the various beams accelerated by the IUCF 200 MeV cyclotron.
Abstract: A non-intercepting movable beam phase probe recently installed in the south valley of the IUCF 200 MeV isochronous cyclotron has been used to study the relative beam phase variation during acceleration for the various beams accelerated by the facility. Small differences between the measured phase histories and the predictions of the field map data were observed and explained. Phase compression during acceleration has been measured, and a method for making rapid small energy changes (± 500 keV) while operating on a single RF frequency using trim coil adjustments at large radius has been developed. These and other consequences of the isochronization studies are discussed.
1 citations