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

Journal Article (Journal Article)

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.

Full Text

Duke Authors

Cited Authors

  • 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

Published Date

  • August 2018

Published In

Volume / Issue

  • 89 / 8

Start / End Page

  • 083301 -

PubMed ID

  • 30184718

Electronic International Standard Serial Number (EISSN)

  • 1089-7623

International Standard Serial Number (ISSN)

  • 0034-6748

Digital Object Identifier (DOI)

  • 10.1063/1.5024938


  • eng