The CANREB project for charge state breeding at TRIUMF

Limited types of radioactive molecules (RM) can be made inside hot-cavity targets at ISOL facilities like TRIUMF. However, extreme conditions in these targets present formidable unsolved challenges to efficient production and delivery of RM’s. Here we propose using RFQ gas-reaction cells to produce RM from radioactive ion beams (RIB) by room temperature RIB-gas chemical reactions at eV energies. Two options are possible: (1) using an ion reaction cell (IRC) that is a linear RFQ ion guide and reaction cell used as an ‘on-line ion source’, and (2) using the ARIEL RFQ cooler-buncher (ARQB). RFQ gas-cells are a controllable and efficient method to produce RM from chemical reactants that cannot be used in ISOL targets. This ‘online chemistry’ offers a way to enable groundbreaking Beyond Standard Model (BSM) physics research, using a wide diversity of new rare and exotic RM beams that would be difficult or impossible to produce in hot-cavity targets.

Section: Riptionmentioning

confidence: 99%

Production of Radioactive Molecular Ions in Radiofrequency Quadrupole Gas-Reaction Cells

Charles

Ames

Kester

et al. 2022

“…A new rare isotope beam (RIB) facility, ARIEL is being commissioned at TRIUMF [1]. The facility includes a 200 m long electrostatic beam transport line with a high resolution separator (HRS), and an electron beam ion source (EBIS) based charge-breeding facility with a RFQ cooler/buncher and Nier-spectrometer [2,3]. In order to commission all these low energy beam transport systems, readily available stable ion beams from an off-line ion source are required.…”

Section: Introductionmentioning

confidence: 99%

Design and commissioning of a versatile surface ion source

Saminathan,

Ames,

Angus

et al. 2024

A compact and versatile ion source was designed and commissioned to be used with the new low energy ion beam facilities at TRIUMF. The ion source is based on the principle of surface ionization, in which ions are generated from a neutral atom by impact with a solid surface. The design of the ion source considered several factors, including the type of ions, intensity, energy and emittance of the extracted beams from the source. Commercially available alkali materials with an ionizer are used in the source; the ionizer is integrated with the in house design of extraction and transport system. The source performance was characterized using diagnostics techniques, and its key parameters, such as beam current, emittance, and beam species, were measured. The results showed that the compact surface ion source is able to achieve high ionization efficiency and stable operation, and is suitable for use in commissioning and operation of various ion beam facilities in particle accelerator laboratories.

“…The CANadian Rare isotope facility with Electron Beam ion source (CANREB) is a part of the new Advance Radioactive IsotopE Laboratory (ARIEL) at TRIUMF [1]. The goal of CANREB is to deliver radioactive beams in high intensities, high purity and high charge states to experiments.…”

Section: Introduction and The Canreb Facilitymentioning

confidence: 99%

Pulse-stretching out of the CANREB EBIS

Cavenaile,

Charles,

Kester

et al. 2024

The CANadian Rare isotope facility with Electron-Beam ion source (CANREB) at TRIUMF is set to deliver rare isotope beams in high charge states. In the Electron Beam Ion Source (EBIS) ions are charge-bred by collisions with an electron beam of up to 500 mA. A strong magnetic field (up to 6T) maximizes the overlap between ions and electron beam and increases the breeding efficiency. Ion confinement is maintained by a combination of an electrostatic field and the electron beam space-charge potential. Ions are released by lowering the trapping potential with a step function. The system is operated at a pulse repetition frequency up to 100 Hz. Due to the short trap length, this fast extraction scheme produces pulses shorter than 10 µs with high instantaneous rates that can saturate detectors in experiments. Stretching the pulse can be done using a slowly varying voltage function to modify trap electrode potentials instead of a step function. The ideal function produces a pulse with a flat top distribution and can be calculated by knowing the ion energy distribution inside the trap. The latest pulse-stretching results will be discussed including the latest pulse duration up to 1.4 ms that have been produced. The slow extraction scheme has also been used for a measurement of the effective energy distribution of the ions inside the trap.