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A Linear Paul Trap without the use of the Transverse Quadrupole Field

Kunihiro KOJIMA, Masato GOTO, Hiroyuki HIGAKI, Kiyokazu ITO and Hiromi OKAMOTO

Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan

(Received 7 November 2021 / Accepted 12 December 2021 / Published 2 February 2022)

Abstract

A detailed experimental study has been conducted to demonstrate the efficient confinement of ions in the popular four-rod configuration of a linear Paul trap without exciting the transverse radio-frequency (rf) quadrupole field. The three-dimensional (3D) ion confinement is achieved with an identical rf voltage applied to the end electrodes. The optimum operating region is visualized in the stability tune diagram, which indicates that a large number of ions can be stored by adjusting a few fundamental parameters. The lifetime of an ion cloud in the present linear trap is over a second (corresponding to a million rf cycles), long enough for various practical applications. It is also shown through 3D numerical simulations that one can easily extract ions from the trap at a low loss rate below 10%.

Copyright (c) 2022 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

non-neutral plasma, linear Paul trap, radio-frequency confinement of ion, stability diagram

DOI: 10.1585/pfr.17.1406003

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