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Development of a variable-energy, high-intensity, pulsed-mode ion source for low-energy nuclear astrophysics studies.

Publication ,  Journal Article
Cooper, AL; Kelly, KJ; Machado, E; Pogrebnyak, I; Surbrook, J; Tysor, C; Thompson, P; Emamian, M; Walsh, B; Carlin, B; Dermigny, JR; Clegg, TB ...
Published in: The Review of scientific instruments
August 2018

The primary challenge in directly measuring nuclear reaction rates near stellar energies is their small cross sections. The signal-to-background ratio in these complex experiments can be significantly improved by employing high-current (mA-range) beams and novel detection techniques. Therefore, the electron cyclotron resonance ion source at the Laboratory for Experimental Nuclear Astrophysics underwent a complete upgrade of its acceleration column and microwave system to obtain high-intensity, pulsed proton beams. The new column uses a compression design with O-ring seals for vacuum integrity. Its voltage gradient between electrode sections is produced by the parallel resistance of channels of chilled, deionized water. It also incorporates alternating, transverse magnetic fields for electron suppression and an axially adjustable beam extraction system. Following this upgrade, the operational bremsstrahlung radiation levels and high-voltage stability of the source were vastly improved, over 3.5 mA of target beam current was achieved, and an order-of-magnitude increase in normalized brightness was measured. Beam optics calculations, structural design, and further performance results for this source are presented.

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Published In

The Review of scientific instruments

DOI

EISSN

1089-7623

ISSN

0034-6748

Publication Date

August 2018

Volume

89

Issue

8

Start / End Page

083301

Related Subject Headings

  • Applied Physics
  • 51 Physical sciences
  • 40 Engineering
  • 34 Chemical sciences
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences
 

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Cooper, A. L., Kelly, K. J., Machado, E., Pogrebnyak, I., Surbrook, J., Tysor, C., … Clegg, T. B. (2018). Development of a variable-energy, high-intensity, pulsed-mode ion source for low-energy nuclear astrophysics studies. The Review of Scientific Instruments, 89(8), 083301. https://doi.org/10.1063/1.5024938
Cooper, Andrew L., K. J. Kelly, E. Machado, I. Pogrebnyak, J. Surbrook, C. Tysor, P. Thompson, et al. “Development of a variable-energy, high-intensity, pulsed-mode ion source for low-energy nuclear astrophysics studies.The Review of Scientific Instruments 89, no. 8 (August 2018): 083301. https://doi.org/10.1063/1.5024938.
Cooper AL, Kelly KJ, Machado E, Pogrebnyak I, Surbrook J, Tysor C, et al. Development of a variable-energy, high-intensity, pulsed-mode ion source for low-energy nuclear astrophysics studies. The Review of scientific instruments. 2018 Aug;89(8):083301.
Cooper, Andrew L., et al. “Development of a variable-energy, high-intensity, pulsed-mode ion source for low-energy nuclear astrophysics studies.The Review of Scientific Instruments, vol. 89, no. 8, Aug. 2018, p. 083301. Epmc, doi:10.1063/1.5024938.
Cooper AL, Kelly KJ, Machado E, Pogrebnyak I, Surbrook J, Tysor C, Thompson P, Emamian M, Walsh B, Carlin B, Dermigny JR, Champagne AE, Clegg TB. Development of a variable-energy, high-intensity, pulsed-mode ion source for low-energy nuclear astrophysics studies. The Review of scientific instruments. 2018 Aug;89(8):083301.

Published In

The Review of scientific instruments

DOI

EISSN

1089-7623

ISSN

0034-6748

Publication Date

August 2018

Volume

89

Issue

8

Start / End Page

083301

Related Subject Headings

  • Applied Physics
  • 51 Physical sciences
  • 40 Engineering
  • 34 Chemical sciences
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences