Abstract
The Californium Rare Ion Breeder Upgrade (CARIBU) project utilizes 252Cf to provide beams of neutron-rich nuclides with intensities not currently available at other facilities. The electroplated 252Cf source is positioned inside a large helium gas catcher, where the ejected fission fragments lose their energy and are slowed. Prior to entering this gas catcher, the ions first pass through a gold cover foil to contain self-sputtering recoil emissions and then through an aluminium degrader foil, where much of their residual energy is reduced. In the past due to production limitations, a less than ideal cylindrical shaped degrader was utilized. This resulted in non-uniform energy loss as the ions passed through the degrader. With the advent of 3D printing, a new hemispherical degrader was prepared to enable a more uniform energy loss. The design, production, and assembly will be discussed.
Highlights
Introduction and motivationBeams of exotic neutron-rich nuclei are of high interest for nuclear physics research studying phenomena such as nucleosynthesis of heavy nuclei and nuclear structure of nuclides approaching the neutron dripline
The Californium Rare Ion Breeder Upgrade (CARIBU) project utilizes 252Cf to provide radioactive beams not produced in the low-energy fission of uranium as well as producing elements that are difficult to extract using standard ISOL techniques [1]
The ions are accelerated to the isobar separator, where two 60° magnets are used to isolate the species of interest; this high-purity beam is sent directly or reaccelerated using the EBIS charge breeder to various experimental stations at Argonne Tandem Linear Accelerator System (ATLAS)
Summary
Beams of exotic neutron-rich nuclei are of high interest for nuclear physics research studying phenomena such as nucleosynthesis of heavy nuclei and nuclear structure of nuclides approaching the neutron dripline. The Californium Rare Ion Breeder Upgrade (CARIBU) project utilizes 252Cf to provide radioactive beams not produced in the low-energy fission of uranium as well as producing elements that are difficult to extract using standard ISOL techniques [1]. CARIBU provides beams of neutron-rich species to the Argonne Tandem Linear Accelerator System (ATLAS) where they can be accelerated up to ~ 10 MeV/u. The ions are accelerated to the isobar separator, where two 60° magnets are used to isolate the species of interest; this high-purity beam is sent directly or reaccelerated using the EBIS charge breeder to various experimental stations at ATLAS
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