Intense heavy-ion beam transport with electric and magnetic quadrupoles

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Description

As part of the small induction recirculator development at LLNL, the authors are testing an injector and transport line that delivers 4 {micro}s beams of potassium with repetition rates up to 10 Hz at a nominal current of 2 mA. The normalized K-V equivalent emittance of the beams is near 0.02 {pi} mm-mrad and is mostly determined by the temperature of the source (0.1 eV). K{sup +} ions generated at 80 keV in a Pierce diode are matched to an alternating gradient transport line by seven electric quadrupoles. Two additional quads have been modified to serve as two-axis steerers. The ... continued below

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12 p.

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Fessenden, T. J.; Barnard, J. J.; Cable, M. D.; Deadrick, F.J.; Eylon, S.; Nelson, M. B. et al. August 1, 1995.

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Description

As part of the small induction recirculator development at LLNL, the authors are testing an injector and transport line that delivers 4 {micro}s beams of potassium with repetition rates up to 10 Hz at a nominal current of 2 mA. The normalized K-V equivalent emittance of the beams is near 0.02 {pi} mm-mrad and is mostly determined by the temperature of the source (0.1 eV). K{sup +} ions generated at 80 keV in a Pierce diode are matched to an alternating gradient transport line by seven electric quadrupoles. Two additional quads have been modified to serve as two-axis steerers. The matching section is followed by a transport section comprised of seven permanent magnet quadrupoles. Matching to this section is achieved by adjusting the voltages on the electric quadrupoles to voltages calculated by an envelope matching code. Measurements of beam envelope parameters are made at the matching section entrance and exit as well as at the end of the permanent magnet transport section. Beam current waveforms along the experiment are compared with results from a one-dimension longitudinal dynamics code. Initial experiments show particle loss occurring at the beam head as a result of overtaking. The apparatus is also being used for the development of non or minimally intercepting diagnostics for future recirculator experiments. These include capacitive monitors for determining beam line-charge density and position in the recirculator; flying wire scanners for beam position; and gated TV scanners for measuring beam profiles and emittance.

Physical Description

12 p.

Notes

INIS; OSTI as DE96002318

Source

  • International symposium on heavy ion inertial fusion, Princeton, NJ (United States), 6-9 Sep 1995

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  • Other: DE96002318
  • Report No.: LBL--37326
  • Report No.: CONF-9509149--8
  • Grant Number: AC03-76SF00098;W-7405-ENG-48
  • DOI: 10.2172/132777 | External Link
  • Office of Scientific & Technical Information Report Number: 132777
  • Archival Resource Key: ark:/67531/metadc627280

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • August 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Feb. 20, 2017, 12:38 p.m.

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Fessenden, T. J.; Barnard, J. J.; Cable, M. D.; Deadrick, F.J.; Eylon, S.; Nelson, M. B. et al. Intense heavy-ion beam transport with electric and magnetic quadrupoles, report, August 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc627280/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.