Synthesizing a four-dimensional beam particle distribution frommultiple two-dimensional views

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The transverse dynamics of a nearly-monoenergetic particle beam are described by the evolution of the 4D distribution f(x,y,x',y'), where x and y are the transverse spatial coordinates and x' {triple_bond} p{sub x}/p{sub z} and y' {triple_bond} p{sub y}/p{sub z} are the corresponding momentum components divided by the longitudinal momentum component. In present-day experimental practice, such beams are often diagnosed by passing them through an axially-separated pair of slits parallel to the y axis. This selects for x and x' and integrates over y and y'. A sequence of pulses (with the slits at various x positions) yields a 2D projection ... continued below

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Friedman, A.; Grote, D.P.; Celata, C.M. & Staples, J.W. February 20, 2002.

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Description

The transverse dynamics of a nearly-monoenergetic particle beam are described by the evolution of the 4D distribution f(x,y,x',y'), where x and y are the transverse spatial coordinates and x' {triple_bond} p{sub x}/p{sub z} and y' {triple_bond} p{sub y}/p{sub z} are the corresponding momentum components divided by the longitudinal momentum component. In present-day experimental practice, such beams are often diagnosed by passing them through an axially-separated pair of slits parallel to the y axis. This selects for x and x' and integrates over y and y'. A sequence of pulses (with the slits at various x positions) yields a 2D projection of the beam phase space, f(x,x'). Another scanner might yield f(y,y') or, using crossed slits, f(x,y). The challenge is that a small set of such 2D scans does not uniquely specify f(x,y,x',y'); correlations in planes other than those measured are unknown. We have developed Monte-Carlo methods and formulated physically-motivated constraints to synthesize a ''reasonable'' set of particles having 2D projectional densities consistent with the experimental data. Such a set may be used to initialize simulations of the downstream beam. The methods and their performance on model problems are described.

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  • Report No.: LBNL--49647
  • Report No.: HIFAN 1177
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/881378 | External Link
  • Office of Scientific & Technical Information Report Number: 881378
  • Archival Resource Key: ark:/67531/metadc873524

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  • February 20, 2002

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Sept. 30, 2016, 2:37 p.m.

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Friedman, A.; Grote, D.P.; Celata, C.M. & Staples, J.W. Synthesizing a four-dimensional beam particle distribution frommultiple two-dimensional views, report, February 20, 2002; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc873524/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.