The Oak Ridge Isochronous Cyclotron, ORIC, serves as the driver accelerator for the production of radioactive ion beams (RIBs) at the Holifield Radioactive Ion Beam Facility (HRIBF). ORIC has served the physics community for almost 40 years as first a light ion accelerator, then as an energy booster for the Holifield Heavy Ion Research Facility’s 25 MV tandem electrostatic accelerator, and now as a light ion driver for RIB production. In spite of its age, ORIC is a more durable and efficient accelerator than ever through extensive enhancements and development initiatives in recent years. Control system, power supply, central region, and mechanical upgrades have proven effective in making ORIC a key to recent research successes at HRIBF. This paper describes the ORIC enhancements and the recent RIB research to which it has contributed.

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The Oak Ridge Isochronous Cyclotron: Enhancements to ORNL's HRIBF Driver Accelerator

The Holifield Radioactive Ion Beam Facility (HRIBF) provides high-quality Isotope Separator Online beams of short-lived, radioactive nuclei for nuclear structure and reaction studies, astrophysics research, and interdisciplinary applications. The primary driver, the Oak Ridge Isochronous Cyclotron, produces rare isotopes by bombarding highly refractory targets with light ions. The radioactive isotopes are ionized, formed into a beam, mass selected, injected into the 25 MV tandem, accelerated, and used in experiments. This paper reviews the HRIBF and its users' science.

http://iopscience.iop.org/article/10.1088/0954-3899/38/2/024002/pdf

ISOL science at the Holifield Radioactive Ion Beam Facility

Radioactive Ion Beams from Uranium Carbide Targets at HRIBF

As hindrance sets in for the fusion of heavier systems, the effect of large neutron excess in the colliding nuclei on their probability to fuse is still an open question. The detection of evaporation residues (ERs), however, provides indisputable evidence for the fusion (complete and incomplete) in the reaction. We therefore devised a system with which we could measure ERs using low intensity neutron‐rich radioactive ion beams with an efficiency close to 100%. We report on measurements of the production of ERs in collisions of 132,134Sn, 134Te and 134Sb ion beams with medium mass, neutron‐rich targets. The data taken with 132,134Sn bombarding a 64Ni target are compared to available data (ERs and fusion) taken with stable Sn isotopes. Preliminary data on the fusion of 132Sn with 96Zr target are also presented.

Evaporation residue yields in reactions of heavy neutron‐rich radioactive ion beams with 64Ni and 96Zr targets

This report discusses two techniques developed at the Oak Ridge National Laboratory (ORNL) that are employed for the fabrication and characterization of targets used in the production of Radioactive Ion Beams (RIBs). First, our method of in-house fabrication of uranium carbide targets is discussed. We have found that remarkably uniform coatings of UC2 can be formed on the microstructure of porous C matrices. The technique has been used to form UC2 layers on highly thermally conductive graphitic foams. Targets fabricated in this fashion have been tested under low-intensity proton bombardment and yields of selected radioactive species are reported. This report also describes an off-line test stand for the investigation of effusive and diffusive transport in RIB target/ion sources. Permeation rates of gases and vapors passing through a high temperature membrane or through an effusive channel constructed from the material under investigation are recorded. Diffusion coefficients and adsorption enthalpies, whic...

Characterization and fabrication of target materials for RIB generation

The Holifield Radioactive Ion Beam Facility (HRIBF) construction project has been completed and the first radioactive ion beam has been successfully accelerated. The project, which began in 1992, has involved numerous facility modifications. The Oak Ridge Isochronous Cyclotron has been converted from an energy booster for heavy ion beams to a light ion accelerator with internal ion source. A target-ion source and mass analysis system have been commissioned as key components of the facility's radioactive ion beam injector to the 25 MV tandem electrostatic accelerator. Beam transport lines have been completed, and new diagnostics for very low intensity beams have been developed. Work continues on a unified control system. Development of research quality radioactive beams for the nuclear structure and nuclear astrophysics communities continues. This paper details facility development to date.

Development of the Holifield Radioactive Ion Beam Facility

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Radioactive Ion Beams from Uranium Carbide Targets at HRIBF

Evaporation residue yields in reactions of heavy neutron‐rich radioactive ion beams with 64Ni and 96Zr targets

Characterization and fabrication of target materials for RIB generation

Development of the Holifield Radioactive Ion Beam Facility