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

M. A. Blessenohl; S. Dobrodey; C. Warnecke; M. K. Rosner; L. Graham; S. Paul; T. M. Baumann; Z. Hockenbery; R. Hubele; T. Pfeifer; F. Ames; J. Dilling; J. R. Crespo López-Urrutia

doi:10.1063/1.5021045

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

M. A. Blessenohl, S. Dobrodey, C. Warnecke, M. K. Rosner, L. Graham, S. Paul, T. M. Baumann, Z. Hockenbery, R. Hubele, T. Pfeifer, F. Ames, J. Dilling, J. R. Crespo López-Urrutia

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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/cm² 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 ≈10⁷ 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.

Original language	English
Article number	052401
Journal	Review of Scientific Instruments
Volume	89
Issue number	5
DOIs	https://doi.org/10.1063/1.5021045
State	Published - May 1 2018
Externally published	Yes

Funding

For their expertise and competent fabrication of numerous parts, we gratefully acknowledge the MPIK engineering design office headed by Frank Müller, the MPIK mechanical workshop and apprenticeship workshop lead by Thorsten Spranz and Stefan Flicker, respectively, and the MPIK electronics and electronics-apprenticeship workshops. We thank Christian Kaiser, Daniel Müller, Lukas Dengel, and Thomas Busch for their expeditious technical help, and Chintan Shah for valuable comments on the manuscript. Support for the project was provided by the Max-Planck-Gesellschaft zur Förderung der Wissenschaften. TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada. CANREB is funded by the Canada Foundation for Innovation (CFI), the Provinces NS, MA and by TRIUMF.

Funders	Funder number
TRIUMF
Canada Foundation for Innovation

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10.1063/1.5021045

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Blessenohl, M. A., Dobrodey, S., Warnecke, C., Rosner, M. K., Graham, L., Paul, S., Baumann, T. M., Hockenbery, Z., Hubele, R., Pfeifer, T., Ames, F., Dilling, J., & Crespo López-Urrutia, J. R. (2018). An electron beam ion trap and source for re-acceleration of rare-isotope ion beams at TRIUMF. Review of Scientific Instruments, 89(5), Article 052401. https://doi.org/10.1063/1.5021045

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title = "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 f{\"u}r Kernphysik (MPIK) reaches already for a 5 keV electron beam and a current of 1 A with a density in excess of 5000 A/cm2 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 ≈107 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.",

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AU - Warnecke, C.

AU - Rosner, M. K.

AU - Graham, L.

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AU - Baumann, T. M.

AU - Hockenbery, Z.

AU - Hubele, R.

AU - Pfeifer, T.

AU - Ames, F.

AU - Dilling, J.

AU - Crespo López-Urrutia, J. R.

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N2 - 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/cm2 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 ≈107 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.

AB - 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/cm2 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 ≈107 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.

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

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