Exact solution of the envelope equations for a matchedquadrupole-focused beam in the zero space-charge limit

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The Kapchinskij-Vladimirskij equations are widely used to study the evolution of the beam envelopes in a periodic system of quadrupole focusing cells. In this paper, we analyze the case of a matched beam. Our model is analogous to that used by Courant and Snyder [E.D. Courant and H.S. Snyder, Ann. Phys. 3, 1 (1958)] in obtaining a first-order approximate solution for a synchrotron. Here, we treat a linear machine and obtain an exact solution. The model uses a full occupancy, piecewise-constant focusing function and neglects space charge. There are solutions in an infinite number of bands as the focus strength ... continued below

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Anderson, Oscar A. & LoDestro, L.L. November 7, 2008.

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The Kapchinskij-Vladimirskij equations are widely used to study the evolution of the beam envelopes in a periodic system of quadrupole focusing cells. In this paper, we analyze the case of a matched beam. Our model is analogous to that used by Courant and Snyder [E.D. Courant and H.S. Snyder, Ann. Phys. 3, 1 (1958)] in obtaining a first-order approximate solution for a synchrotron. Here, we treat a linear machine and obtain an exact solution. The model uses a full occupancy, piecewise-constant focusing function and neglects space charge. There are solutions in an infinite number of bands as the focus strength is increased. We show that all these bands are stable. Our explicit results for the phase advance {sigma} and the envelope a(z) are exact for all phase advances except multiples of 180{sup o}, where the behavior is singular. We find that the peak envelope size is minimized at {sigma} = 90{sup o}. Actual operation in the higher bands would require very large, very accurate field strengths and would produce significantly larger envelope excursions.

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  • Journal Name: Physical Review Special Topics - Accelerators and Beams

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  • Report No.: LBNL-1228E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 943973
  • Archival Resource Key: ark:/67531/metadc898328

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  • November 7, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 28, 2016, 7:11 p.m.

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Anderson, Oscar A. & LoDestro, L.L. Exact solution of the envelope equations for a matchedquadrupole-focused beam in the zero space-charge limit, article, November 7, 2008; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc898328/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.