Paper  Title  Page 

TUC1C1  Effect of ThreeDimensional Quadrupole Magnet Model on Beam Dynamics in the FODO Line at the Spallation Neutron Source Beam Test Facility  65 


Funding: Supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics. Authored by UT Battelle, LLC under Contract No. DEAC0500OR22725 with the U.S. Department of Energy. The research program at the Spallation Neutron Source (SNS) Beam Test Facility (BTF) focuses on improving accelerator model accuracy. This study explores the effect of two different models of permanent magnet quadrupoles, which comprise a 9.5cell FODO line in the BTF. The more realistic model includes all higherorder terms, while the simple, in use model, is a perfect quadrupole. Particular attention is paid to highamplitude particles to understand how the choice of quadrupole model will affect beam halo distributions. In this paper, we compare particle tracking through a FODO line that contains only linear terms  a perfect quadrupole model  to a full 3D model. 

Slides TUC1C1 [1.705 MB]  
DOI •  reference for this paper ※ doi:10.18429/JACoWHB2023TUC1C1  
About •  Received ※ 01 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 27 October 2023  
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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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TUC3I3  Laser Stripping of H⁻ Beam  141 


Basic principles of laser assisted charge exchange injection for H⁻ ion andH^{0} beams are presented. Theoretical aspects of electromagnetic interaction of laser with hydrogen atom and H⁻ ions are discussed. Laser excitation, photoionizatio and interaction of atoms and ions with a strong electromagnetic field are discussed and compared. Different techniques of LACE for stripping of high current stochastic beams are presented. The optimum parameters of LACE are estimated and compared for various ion beam energies. Experimental development of laser stripping at the SNS are reviewed. Future plans of LACE at the SNS and JPARC are discussed.  
Slides TUC3I3 [1.790 MB]  
DOI •  reference for this paper ※ doi:10.18429/JACoWHB2023TUC3I3  
About •  Received ※ 04 October 2023 — Revised ※ 07 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 01 November 2023  
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