An electron beam ion trap and source for re-acceleration of rare-isotope ion beams at TRIUMF

Abstract

Electron beam driven ionization can produce highly charged ions (HCIs) in a few well-defined charge states. Ideal conditions for this are maximally focused electron beams and an extremely clean vacuum environment. A cryogenic electron beam ion trap fulfills these prerequisites and delivers very pure HCI beams. The Canadian rare isotope facility with electron beam ion source-electron beam ion sources developed at the Max-Planck-Institut für Kernphysik (MPIK) reaches already for a 5 keV electron beam and a current of 1 A with a density in excess of 5000 A/cm by means of a 6 T axial magnetic field. Within the trap, the beam quickly generates a dense HCI population, tightly confined by a space-charge potential of the order of 1 keV times the ionic charge state. Emitting HCI bunches of ≈10 ions at up to 100 Hz repetition rate, the device will charge-breed rare-isotope beams with the mass-over-charge ratio required for re-acceleration at the Advanced Rare IsotopE Laboratory (ARIEL) facility at TRIUMF. We present here its design and results from commissioning runs at MPIK, including X-ray diagnostics of the electron beam and charge-breeding process, as well as ion injection and HCI-extraction measurements.

A low-energy compact Shanghai-Wuhan electron beam ion trap for extraction of highly charged ions

“…41 Up to now, many mini-EBITs have been developed. The advantages of these mini-EBITs are that they are lower cost, easier to operate, and in particular, they can be used as portable HCIs sources, [42][43][44][45][46][47][48][49] for the applications such as tumor ion therapy, 5,50 ion implantation, 5 ion lithography, 5 precision spectroscopy, 51,52 and especially, the new-generation atomic clocks 53 based on HCIs proposed by Berengut et al in 2010. 54 The energy level structure of an HCI is insensitive to external perturbations because of the size of its electron cloud being more compact due to much stronger nuclear constraint.…”

CANREB EBIS commissioning at TRIUMF

“…The CANREB EBIS was designed and constructed at the Max Planck Institute for Nuclear Physics in Heidelberg, Germany [9]. It can accept ion beams with energies up to 14 keV and ∼ 10 7 particles per bunch, which is limited by the space charge limit of the ARQB.…”

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

“…The ARQB cools and bunches RIB spanning the mass range up to U at ≤100 Hz repetition rates containing < 10 7 ions/bunch. Bunch energies are then adjusted by a pulsed drift tube to 6 < E bunch < 14 keV immediately before acceptance into an electron beam ion source (EBIS) for charge breeding [11].…”