Speaker
Description
TRIUMF is enhancing its rare isotope production capabilities by creating a new scientific infrastructure known as the Advanced Rare IsotopE Laboratory (ARIEL). A critical part of this expansion is the CANadian Rare-isotope facility with Electron-Beam ion source (CANREB) project which combines a high-resolution separator, a gas-filled radiofrequency quadrupole (RFQ) cooler and buncher, a pulsed drift tube (PDT), an electron beam ion source (EBIS) charge-breeder, and a Nier-type magnetic spectrometer to deliver pure rare isotope beam for post-
acceleration.
The CANREB-EBIS was developed at the Max Planck-Institut fur Kernphysik (MPIK) in Heidelberg and uses electron beam driven ionisation to produce highly charged ions (HCI) in a few, well-defined charge states. Singly charged ions from the RFQ are injected into a longitudinal electrostatic trap and are then tightly, radially confined by the spacecharge potential of a maximally focussed electron beam current. To date, the maximum electron beam current achieved is 1 A with a density in excess of 5000 Acm$^{-2}$ by means of a 6 T axial magnetic field. It is expected that during operation HCI bunches of up to 10$^{7}$ ions are extracted at a repetition rate of 100 Hz with an A/Q in the range 4-7 which is required for re-acceleration at the ARIEL or ISAC facility. We present here the CANREB-EBIS design and results from the commissioning runs at MPIK and TRIUMF, including X-ray diagnostics of the electron beam and charge-breeding process, as well as ion injection and HCI-extraction measurements.
