Author: Hoover, A.M.
Paper Title Page
TUC1C2 The Impact of High-Dimensional Phase Space Correlations on the Beam Dynamics in a Linear Accelerator 68
 
  • A.M. Hoover, A.V. Aleksandrov, S.M. Cousineau, K.J. Ruisard, A.P. Shishlo, A.P. Zhukov
    ORNL, Oak Ridge, TN, USA
  
  Hadron beams de­velop in­ten­sity-de­pen­dent trans­verse-lon­gi­tu­di­nal cor­re­la­tions within ra­dio-fre­quency quadru­pole (RFQ) ac­cel­er­at­ing struc­tures. These cor­re­la­tions are only vis­i­ble in six-di­men­sional phase space and are de­stroyed by re­con­struc­tions from low-di­men­sional 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, low-di­men­sional pro­jec­tions are prob­a­bly suf­fi­cient for de­tailed pre­dic­tions in high-power linacs.  
slides icon Slides TUC1C2 [6.573 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-TUC1C2  
About • Received ※ 01 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 13 October 2023
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WEC3I1 Self-Consistent Injection Painting for Space Charge Mitigation 258
 
  • N.J. Evans, V.S. Morozov
    ORNL RAD, Oak Ridge, Tennessee, USA
  • T.V. Gorlov, A.M. Hoover
    ORNL, Oak Ridge, TN, USA
  
  Funding: This work was conducted at UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy, with partial funding provided by Field Work Proposal ORNL-ERKCS41.
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 so-called Danilov dis­tri­b­u­tion has uni­form charge dis­tri­b­u­tion, el­lip­ti­cal en­ve­lope in real-space, 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 icon Slides WEC3I1 [2.687 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-WEC3I1  
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)