Optimized baffle and aperture placement in neutral beamlines

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Description

Most neutral beamlines contain an iron-core ion-bending magnet that requires shielding between the end of the neutralizer and this magnet. This shielding allows the gas pressure to drop prior to the beam entering the magnet and therefore reduces beam losses in this drift region. We have found that the beam losses can be reduced even further by eliminating the iron-core magnet and the magnetic shielding altogether. The required bending field can be supplied by current coils without the iron poles. In addition, placement of the baffles and apertures can affect the cold gas entering the plasma region and the losses ... continued below

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Pages: 6

Creation Information

Stone, R.; Duffy, T. & Vetrovec, J. November 23, 1983.

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Description

Most neutral beamlines contain an iron-core ion-bending magnet that requires shielding between the end of the neutralizer and this magnet. This shielding allows the gas pressure to drop prior to the beam entering the magnet and therefore reduces beam losses in this drift region. We have found that the beam losses can be reduced even further by eliminating the iron-core magnet and the magnetic shielding altogether. The required bending field can be supplied by current coils without the iron poles. In addition, placement of the baffles and apertures can affect the cold gas entering the plasma region and the losses in the neutral beam due to re-ionization. In our study we varied the placement of the baffles, which determine the amount of pumping in each chamber, and the apertures, which determine the beam loss. Our results indicate that a baffle/aperture configuration can be set for either minimum cold gas into the plasma region or minimum beam losses, but not both.

Physical Description

Pages: 6

Notes

NTIS, PC A02/MF A01.

Source

  • 10. symposium on fusion engineering, Philadelphia, PA, USA, 5 Dec 1983

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  • Other: DE84003746
  • Report No.: UCRL-89320
  • Report No.: CONF-831203-31
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 5507634
  • Archival Resource Key: ark:/67531/metadc1093835

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Office of Scientific & Technical Information Technical Reports

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

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • November 23, 1983

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

Description Last Updated

  • March 20, 2018, 7:50 p.m.

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Stone, R.; Duffy, T. & Vetrovec, J. Optimized baffle and aperture placement in neutral beamlines, article, November 23, 1983; United States. (digital.library.unt.edu/ark:/67531/metadc1093835/: accessed June 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.