Bends and momentum dispersion during final compression in heavy ion fusion drivers

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Between the accelerator and fusion chamber the heavy ion beams are subject to a dramatic but vital series of manipulations, some of which are carried out simultaneously and involve large space charge forces. The beams' quality must be maintained at a level sufficient for the fusion application; this general requirement significantly impacts beam line design, especially in the considerations of momentum dispersion. Immediately prior to final focus onto a fusion target, heavy ion driver beams are compressed in length by typically an order of magnitude. This process is simultaneous with bending through large angles to achieve the required target illumination ... continued below

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Lee, Edward P. & Barnard, John J. January 23, 2002.

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Between the accelerator and fusion chamber the heavy ion beams are subject to a dramatic but vital series of manipulations, some of which are carried out simultaneously and involve large space charge forces. The beams' quality must be maintained at a level sufficient for the fusion application; this general requirement significantly impacts beam line design, especially in the considerations of momentum dispersion. Immediately prior to final focus onto a fusion target, heavy ion driver beams are compressed in length by typically an order of magnitude. This process is simultaneous with bending through large angles to achieve the required target illumination configuration. The large increase in beam current is accommodated by a combination of decreased lattice period, increased beam radius, and increased strength of the beamline quadrupoles. However, the large head-to-tail momentum tilt (up to 5%) needed to compress the pulse results in a very significant dispersion of the pulse centroid from the design axis. General design features are discussed. A principal design goal is to minimize the magnitude of the dispersion while maintaining approximate first order achromaticity through the complete compression/bend system. Configurations of bends and quadrupoles, which achieve this goal while simultaneously maintaining a locally matched beam-envelope, are analyzed.

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INIS; OSTI as DE00799577

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  • 14th International Symposium on Heavy Ion Inertial Fusion HIF2002, Moscow (RU), 05/26/2002--05/31/2002

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  • Report No.: LBNL--49646
  • Report No.: HIFAN 1136
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 799577
  • Archival Resource Key: ark:/67531/metadc742820

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  • January 23, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • April 4, 2016, 3:57 p.m.

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Lee, Edward P. & Barnard, John J. Bends and momentum dispersion during final compression in heavy ion fusion drivers, article, January 23, 2002; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc742820/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.