Wide dynamic-range beam-profile instrumentation for a beam-halo measurement: Description and operation

Within the halo experiment conducted at the Low Energy Demonstration Accelerator (LEDA) at LANL, specific beam instruments that acquire horizontally and vertically projected particle-density distributions out to > 100000: 1 dynamic range are located throughout the 52-magnet halo lattice. We measured the core of the distributions using traditional wire scanners, and the tails of the distributions using water-cooled graphite scraping devices. The wire scanner and halo scrapers are mounted on the same moving frame whose location is controlled with stepper motors. A sequence within the Experimental Physics and Industrial Control System (EPICS) software communicates with a National Instruments LabVIEW virtual instrument to control the motion and location of the scanner/scraper assembly. Secondary electrons from the wire scanner 0.033-mm carbon wire and protons impinging on the scraper are both detected with a lossy-integrator electronic circuit. Algorithms implemented within EPICS and in Research System's Interactive Data Language subroutines analyze and plot the acquired distributions. This paper describes the beam instrument and our experience with its operation.