Sep 20 – 24, 2021
America/Vancouver timezone

Optimization of Ion Transport in a Combined RFQ Cooler with Axial Magnetic Field

Sep 21, 2021, 7:15 AM
Parallel Session (Contributed Oral) talk Radioactive ion beams, charge breeders and polarized beams


Marco Cavenago (INFN-LNL)


The accurate mass spectrometry (with resolution goal 1:20000) of exotic ions requests beams with low energy spread (goal is about 0.5 eVrms or lower) and low tranverse emittance; so it is necessary to cool ions produced by a spallation source of a factor from 5 to 10. In a radiofrequency (rf) quadrupole cooler (RFQC), collisions decrease ion kinetic energy, while rf and bias voltages confine and reaccelerate ions towards the extraction, where the cold ion beam is formed. Operation is based on carefully chosen voltage tunings, and among others: the dependence on ion species and gas pressure, which requests an adequate pumping system; the difficult design of an efficient ion extraction, which critically depends on residual ion speed. Progresses in the experimental setup are described. Indications from simple ion tracing, ion+collision tracing and some limited Monte Carlo simulations are compared. Results are applied to the comparison of triode and tetrode design of the extraction system.

E-mail for contact person
Funding Information INFN-CSN5 (experiment Ion2neutral)

Primary authors

Marco Cavenago (INFN-LNL) Massimiliano Romé (INFN, Italy) Giancarlo Maero Mario Maggiore (INFN - National Institute for Nuclear Physics) Luca Bellan (INFN-LNL) Dr Francesco Cavaliere (Univ. Milano Dip Fisica, e INFN-MI) Michele Comunian (INFN Laboratori Nazionali di Legnaro) Alessio Galatà (INFN-Legnaro National Laboratories) Nicola PANZERI (INFN Milano) Andrea Pisent (INFN) Lorenzo Pranovi (INFN National Institute of Nuclear Physics) Manuele Sattin (INFN-LNL)

Presentation materials