Paper  Title  Page 

TUC1C2  The Impact of HighDimensional Phase Space Correlations on the Beam Dynamics in a Linear Accelerator  68 


Hadron beams develop intensitydependent transverselongitudinal correlations within radiofrequency quadrupole (RFQ) accelerating structures. These correlations are only visible in sixdimensional phase space and are destroyed by reconstructions from lowdimensional projections. In this work, we estimate the effect of artificial decorrelation on the beam dynamics in the Spallation Neutron Source (SNS) linac and Beam Test Facility (BTF). We show that the evolution of a realistic initial distribution and its decorrelated twin converge during the early acceleration stages; thus, lowdimensional projections are probably sufficient for detailed predictions in highpower linacs.  
Slides TUC1C2 [6.573 MB]  
DOI •  reference for this paper ※ doi:10.18429/JACoWHB2023TUC1C2  
About •  Received ※ 01 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 13 October 2023  
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WEC3I1  SelfConsistent Injection Painting for Space Charge Mitigation  258 


Funding: This work was conducted at UTBattelle, LLC, under Contract No. DEAC0500OR22725 with the U.S. Department of Energy, with partial funding provided by Field Work Proposal ORNLERKCS41. I will present results of experiments at the Spallation Neutron Source to implement a method of phase space painting we refer to as ¿eigenpainting¿, in which beam is injected along one eigenvector of the transfer matrix of a ring with full coupling. The method and resultant distribution were initially proposed by Danilov almost to linearize the space charge force, minimizing space charge tune spread. In the theoretically ideal case this socalled Danilov distribution has uniform charge distribution, elliptical envelope in realspace, and a vanishing 4D transverse emittance. Such a beam can be maintained throughout injection. The Danilov distribution has implications for increasing beam intensity beyond the conventional space charge limit through a reduction of both tune spread and shift, and increasing collider performance. This talk will present current limits on beam quality, and details of the preparation of the optics in the SNS accumulator ring, including the installation of new solenoid magnets. The status of experiments to improve beam quality and characterize the interesting dynamical implications of the defining features of the Danilov distribution will also be discussed. 

Slides WEC3I1 [2.687 MB]  
DOI •  reference for this paper ※ doi:10.18429/JACoWHB2023WEC3I1  
About •  Received ※ 28 September 2023 — Revised ※ 10 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 23 October 2023  
Cite •  reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  