Design, implementation, and results from a longitudinal phase space tomography (PST) monitor in the Fermilab Main Ring

In order to image the longitudinal phase space density distribution of a beam during complicated RF manipulations or during important points in the ramp such as transition, a Phase Space Tomography (PST) monitor has been installed in the Fermilab Main Ring. Based on tomography techniques normally used to image organs inside human beings, a 2-D map of the internal distribution of charge in longitudinal phase space is produced. The detector is simply a resistive wall monitor. Presented are descriptions of the monitor hardware, image reconstruction software, and results when the monitor is used to diagnose problems during the coalescing process