A compact linear Paul trap cooler buncher for CRIS
Abstract: A gas-filled linear Paul trap for the Collinear Resonance Ionisation Spectroscopy (CRIS) experiment at ISOLDE, CERN is currently under development. The trap is designed to accept beam from both ISOLDE target stations and the CRIS stable ion source. The motivation for the project along with the current design, simulations and future plans, will be outlined.
Summary (1 min read)
- Bunched beams are essential to Collinear Resonance Ionisation Spectroscopy (CRIS) [4, 5, 6] because the required high-power lasers are only available with repetition rates of the order of 100 Hz, meaning the ion beam must also be pulsed to remove duty-cycle losses.
- ISCOOL has been essential to the success of the CRIS experiment, providing bunched beams with <1 eV energy spread and <5 µs width.
- This would allow for continual optimisation of trapping parameters and efficiency with stable isotopes, improving beam quality and transport efficiency for radioactive beam experiments.
2. Prototype RFQcb overview
- Anticipating the available lab space, the current prototype design uses a short trapping region, 20 cm in length, with four cylindrical rods at 5.3 mm internal radius.
- The ions will be trapped longitudinally using DC potentials applied to four printed circuit boards inserted between the rods.
- Preprint submitted to Elsevier April 4, 2019.
- As the figure shows, when a 20 mm side length cube of 3D printed PLA was placed in the vacuum chamber, the pressure decreased to 2 × 10−7 mbar after 5.5 hours of pumping, equal to the pressure reached by the empty chamber within the same pumping time.
- The transmission efficiency at A = 70 was 54% and the final simulated emittance of the cooled beam at this mass was 1.5 πmm mrad.
- The benefits of installing an independent gas-filled linear Paul trap at the CRIS beamline have been explained and the design outlined is under development.
- Simulations have indicated the feasibility of a short trap design and have informed possible design improvements.
- The design offers a cost effective and high efficiency method to trap ions for radioactive beam studies.
- This work also illustrates the possible uses of 3D printed parts in vacuum, enabling cheaper and faster methods for design prototyping.
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The motivation for the project along with the current design, simulations and future plans, will be outlined.