The proposed ISAC facility at TRIUMF: A status report

doi:10.1016/0168-583X(89)91011-2

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

Volumes 40–41, Part 1, 2 April 1989, Pages 418-422

https://doi.org/10.1016/0168-583X(89)91011-2 Get rights and content

Abstract

An accelerated radioactive beams facility for nuclear astrophysics studies was proposed for installation at the TRIUMF facility (Vancouver, Canada) several years ago. It would consist of a front-end on-line separator (ISOL) coupled with a post-accelerator booster stage. The resulting radioactive ion beam would have sufficient energy to perform rate measurements of sub-barrier fusion reactions, involving short-lived reactants. A status report is presented herein along with detailed information on the installation and use of TISOL, a prototype of the frond-end isotope separator device.

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A versatile, new concept, spherical-geometry, positive (negative) surface-ionization source has been designed, fabricated, and initial tests completed which can operate in either positive- or negative-ion beam generation modes without mechanical changes to the source. The highly permeable, composite Ir/C has an intrinsic work function of φ=5.29 eV and can be used directly for the generation of positive-ion beams of highly electropositive elements. For negative-surface ionization, the work function is lowered by dynamic flow of a highly electropositive adsorbate such as Cs through the ionizer matrix. The results of initial testing indicate that the source is reliable, stable and easy to operate, with efficiencies for Cs⁺ conservatively estimated to exceed 60% and as high as ∼50% for F⁻ generation. However, the overall ionization efficiency for F⁻ formation and extraction is ∼1% due to the low efficiency for thermal dissociation of the carrier molecules (assumed to be CsF and AlF). The design features, operational principles, and initial performance of the source for generating Cs⁺ and F⁻, when operated with Cs, are discussed in this article.
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Section III. Nuclear physics and astrophysicsThe proposed ISAC facility at TRIUMF: A status report

Abstract

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

The TRIUMF-ISOL Facility: A Proposal for an Intense Radioactive Beams Facility

Section III. Nuclear physics and astrophysics
The proposed ISAC facility at TRIUMF: A status report