Effects of enhanced chromatic nonlinearity during the AGS {gamma}{sub t}-jump

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The {gamma}{sub t}-jump de-signed to reduce the bunch self-field mismatch and intensity loss during the AGS transition crossing can cause significant orbit and lattice distortions and dramatically enhance chromatic nonlinear effects. Employing a low-intensity, small emittance proton bunch crossing transition with the {gamma}{sub t}-jump quadrupoles excited, we found that the nonlinear momentum-compaction factor {alpha}{sub 1} increases from 2.2 to about 90 in the presence of the {gamma}{sub t}-jump. On the other hand, this enhancement can be effectively suppressed by properly exciting the chromaticity sextupoles, reducing {alpha}{sub 1} from 90 to 16. The experimental measurement agrees well with computer simulations using ... continued below

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4 p.

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Wei, J.; Brennan, J.M. & Ahrens, L.A. May 1, 1995.

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The {gamma}{sub t}-jump de-signed to reduce the bunch self-field mismatch and intensity loss during the AGS transition crossing can cause significant orbit and lattice distortions and dramatically enhance chromatic nonlinear effects. Employing a low-intensity, small emittance proton bunch crossing transition with the {gamma}{sub t}-jump quadrupoles excited, we found that the nonlinear momentum-compaction factor {alpha}{sub 1} increases from 2.2 to about 90 in the presence of the {gamma}{sub t}-jump. On the other hand, this enhancement can be effectively suppressed by properly exciting the chromaticity sextupoles, reducing {alpha}{sub 1} from 90 to 16. The experimental measurement agrees well with computer simulations using MAD and TIBETAN.

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4 p.

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OSTI as DE95011703

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  • 16. Institute of Electrical and Electronic Engineers (IEEE) particle accelerator conference, Dallas, TX (United States), 1-5 May 1995

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  • Other: DE95011703
  • Report No.: BNL--61755
  • Report No.: CONF-950512--116
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 64973
  • Archival Resource Key: ark:/67531/metadc710006

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  • May 1, 1995

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 19, 2015, 10:15 p.m.

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Wei, J.; Brennan, J.M. & Ahrens, L.A. Effects of enhanced chromatic nonlinearity during the AGS {gamma}{sub t}-jump, article, May 1, 1995; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc710006/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.