High order beam features and fitting quadrupole scan data to particle code model.

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Quadrupole scans in the HEBT of the 6.7 MeV LEDA RFQ were analyzed to characterize the RFQ output beam. In previous work, profiles measured by the wire scanner were fit to models (beam parameterizations and HEBT simulations) to determine the transverse Courant-Snyder parameters {alpha}, {beta}, and {epsilon} at the RFQ exit. Unfortunately, at the larger quadrupole settings, the measured profiles showed features that were not present in any of our simulations. Here we describe our latest analysis, which resulted in very good fits by using an improved model for the RFQ output beam. The model beam was generated by the ... continued below

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8 p.

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Lysenko, W. P. (Walter P.); Garnett, R. W. (Robert W.); Gilpatrick, J. D. (John Douglas); Qiang, J. (Ji); Rybarcyk, L. J. (Lawrence J.); Ryne, Robert et al. January 1, 2003.

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Quadrupole scans in the HEBT of the 6.7 MeV LEDA RFQ were analyzed to characterize the RFQ output beam. In previous work, profiles measured by the wire scanner were fit to models (beam parameterizations and HEBT simulations) to determine the transverse Courant-Snyder parameters {alpha}, {beta}, and {epsilon} at the RFQ exit. Unfortunately, at the larger quadrupole settings, the measured profiles showed features that were not present in any of our simulations. Here we describe our latest analysis, which resulted in very good fits by using an improved model for the RFQ output beam. The model beam was generated by the RFQ simulation code TOUTATIS. In our fitting code, this beam was distorted by linear transformations that changed the Courant-Snyder parameters to whatever values were required by the nonlinear optimizer while preserving the high-order features of the phase-space distribution. No new physics in the HEBT was required to explain our quad-scan results, just an improved initial beam. High-order features in the RFQ output beam apparently make a significant difference in behavior downstream of the RFQ. While this result gives us increased confidence in our codes, we still have a mystery: exactly what high-order features in the beam are responsible for the the strange behavior downstream. Understanding this phenomenon may be helpful to understanding our halo-experiment data. We have begun to study this by comparing higher-order moments of the TOUTATIS distribution with other distributions.

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8 p.

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  • Submitted to: International Computational Accelerator Physics Conf. 2002, October 15-18, 2002, Michigan State University, East Lansing, MI"

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  • Report No.: LA-UR-02-6500
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 976389
  • Archival Resource Key: ark:/67531/metadc932422

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  • January 1, 2003

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 6:33 p.m.

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Lysenko, W. P. (Walter P.); Garnett, R. W. (Robert W.); Gilpatrick, J. D. (John Douglas); Qiang, J. (Ji); Rybarcyk, L. J. (Lawrence J.); Ryne, Robert et al. High order beam features and fitting quadrupole scan data to particle code model., article, January 1, 2003; United States. (digital.library.unt.edu/ark:/67531/metadc932422/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.