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 transverse emittance, so it is necessary to cool ions produced by a fission source. In a radiofrequency (rf) quadrupole cooler (RFQC), collisions decrease ion kinetic energy, while rf and DC voltages confine and reaccelerate ions towards the extraction, where the cold ion beam is formed. Operation is based on carefully chosen tunings of voltages and of gas pressure p(g), which requires an adequate pumping system; efficient simulations of extraction systems, which critically depend on residual speed of ions, are also important. Progresses in the experimental setup are described. Indications from simple ray tracing and 'ray+collision' tracing are compared. Results are applied to a simple triode extraction system, and more flexible configurations are considered.

Optimization of ion transport in a combined RFQ Cooler with axial magnetic field / M. Cavenago, M. Rome', G. Maero, L. Bellan, F. Cavaliere, M. Comunian, A. Galata, M. Maggiore, N. Panzeri, A. Pisent, L. Pranovi, M. Sattin. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - 2244:1(2022 Apr 25), pp. 012064.1-012064.6. ((Intervento presentato al 19. convegno International Conference on Ion Sources (ICIS) : September, 20 - 24 tenutosi a (online) nel 2021 [10.1088/1742-6596/2244/1/012064].

Optimization of ion transport in a combined RFQ Cooler with axial magnetic field

M. Rome'
Secondo
;
G. Maero;F. Cavaliere;N. Panzeri;
2022

Abstract

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 transverse emittance, so it is necessary to cool ions produced by a fission source. In a radiofrequency (rf) quadrupole cooler (RFQC), collisions decrease ion kinetic energy, while rf and DC voltages confine and reaccelerate ions towards the extraction, where the cold ion beam is formed. Operation is based on carefully chosen tunings of voltages and of gas pressure p(g), which requires an adequate pumping system; efficient simulations of extraction systems, which critically depend on residual speed of ions, are also important. Progresses in the experimental setup are described. Indications from simple ray tracing and 'ray+collision' tracing are compared. Results are applied to a simple triode extraction system, and more flexible configurations are considered.
Settore FIS/03 - Fisica della Materia
Settore FIS/01 - Fisica Sperimentale
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/930284
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