Abstract
We conduct a detailed measurement and analysis of a hadron beam in five-dimensional phase space at the Spallation Neutron Source Beam Test Facility. The measurement's resolution and dynamic range are sufficient to image sharp, high-dimensional features in low-density regions of phase space. To facilitate the complex task of feature identification in the five-dimensional phase space, we develop several analysis and visualization techniques, including nonplanar slicing. We use these techniques to examine the transverse dependence of longitudinal hollowing and longitudinal dependence of transverse hollowing in the distribution. This analysis strengthens the claim that low-dimensional projections do not adequately characterize high-dimensional phase space distributions in low-energy hadron accelerators.
| Original language | English |
|---|---|
| Article number | 064202 |
| Journal | Physical Review Accelerators and Beams |
| Volume | 26 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 2023 |
Funding
(ii) The transverse hollowing develops in the MEBT regardless of the correlations that develop in the RFQ. This is supported by repeating the simulation after decorrelating the initial bunch by randomly permuting , , and coordinate pairs. The authors acknowledge the contribution of the SNS operators in enabling long (16+ hours) periods of continuous measurement. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics. This manuscript has been authored by UT Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The U.S. Government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. Government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for U.S. Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan [35].