C. K. Allen | Searcharxiv

arXiv2001

SNS Application Programming Plan

The architecture for Spallation Neutron Source accelerator physics application programs is presented. These high level applications involve processing and managing information from the diagnostic instruments, the machine control system, models and static databases; they will be used to investigate and control beam behavior. Primary components include an SNS global database and Java-based Application Toolkit, called XAL. A key element in the SNS application programs is time synchronization of data used in these applications, due to the short pulse length (1 ms), pulsed (60 Hz) nature of the device. The data synchronization progress is also presented.

physics.acc-ph↗

arXiv2000

The Beam Halo Experiment at the LEDA Facility

Due to the potentially adverse effects of the generation of halo particles in intense proton beams, it is imperative to have a clear understanding of the mechanisms that can lead to halo formation for current and proposed high- intensity linacs. To this end a theoretical model has been developed, which indicates that protons under the combined influence of strong space charge forces and periodic focussing in a linear transport channel can be kicked into halo orbits. However, no experimental measurements of beam halo in proton beams have yet been carried out. In this paper we report the progress of an effort to carry out an experiment to measure beam-halo using the existing high- intensity proton beam of the LEDA facility. A linear transport channel has been assembled with the appropriate diagnostics for measuring the expected small beam component in the beam halo as a function of beam parameters. The experiment is based on the use of an array of high-dynamic-range wire and beam scrapers to determine the halo and core profiles along the transport channel. Details of the experimental design, the expected halo measurement properties will be presented.

physics.acc-ph↗