Author: Zhang, Z.L.
Paper Title Page
SUPAF10 Reconstruction of Particle Distributions at RFQ Exit at SNS Beam Test Facility 76
 
  • Z.L. Zhang
    ORNL RAD, Oak Ridge, Tennessee, USA
  • A.V. Aleksandrov, S.M. Cousineau
    ORNL, Oak Ridge, Tennessee, USA
  
  Fluc­tu­a­tions of beam pa­ra­me­ters and un­cer­tain­ties of quadru­pole gra­di­ents dur­ing mea­sure­ments have ef­fects on the re­con­struc­tion of ini­tial par­ti­cle dis­tri­b­u­tions. To eval­u­ate these ef­fects, the con­cept of a dis­tri­b­u­tion dis­crep­ancy is pro­posed. Re­sults sug­gest ef­fects of fluc­tu­a­tions of beam pa­ra­me­ters are small, while un­cer­tain­ties of quadru­pole gra­di­ents are the main fac­tors that af­fect the re­con­structed dis­tri­b­u­tions. By com­par­ing the mea­sured dis­tri­b­u­tions with dis­tri­b­u­tions pro­duced by track­ing the re­con­structed ini­tial dis­tri­b­u­tions, it is proved that the real or quasi-real (clos­est to real) ini­tial dis­tri­b­u­tion can be ob­tained as long as the min­i­mum dis­tri­b­u­tion dis­crep­ancy is found.  
slides icon Slides SUPAF10 [8.261 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-SUPAF10  
About • paper received ※ 18 October 2018       paper accepted ※ 27 January 2019       issue date ※ 26 January 2019  
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TUPAG12
 SNS Beam Test Facility for Experimental Benchmark of High Intensity Beam Dynamics Computer Simulation  
 
  • A.V. Aleksandrov, S.M. Cousineau, A.P. Zhukov
    ORNL, Oak Ridge, Tennessee, USA
  • B.L. Cathey, Z.L. Zhang
    ORNL RAD, Oak Ridge, Tennessee, USA
  
  The SNS Beam Test Fa­cil­ity (BTF) is a 2.5 MeV hadron ac­cel­er­a­tor equipped with state-of-the-art trans­verse and lon­gi­tu­di­nal beam di­ag­nos­tics. The BTF can pro­duce pulsed high in­ten­sity H− beam with up to 50mA peak cur­rent. The ex­pected avail­able beam-on time of a few thou­sand hours per year pro­vides an op­por­tu­nity for car­ry­ing out ad­vanced high in­ten­sity beam dy­nam­ics ex­per­i­ments. The first ever di­rect mea­sure­ment of 6D phase space dis­tri­b­u­tion of a beam in an ac­cel­er­a­tor has re­cently been com­pleted. Pre­lim­i­nary analy­sis of the data shows a com­plex phase space struc­ture that is not vis­i­ble in mea­sure­ments below 5D, in­clud­ing cor­re­la­tions be­tween de­grees of free­dom not cus­tom­ar­ily mea­sured to­gether. This re­sult opens path for­ward to solv­ing the long-stand­ing prob­lem of ini­tial con­di­tion in hadron linac beam dy­nam­ics sim­u­la­tion. An ex­ten­sion of the BTF beam line con­sist­ing of a FODO line and high dy­namic range emit­tance mon­i­tor is being built to pro­vide a test bench for sim­u­la­tion codes bench­mark­ing against mea­sure­ments in well con­trolled en­vi­ron­ment. This paper de­scribes these ef­forts along with the longer-term plans.  
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