Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 22: Highly Charged Ions and their Applications I
A 22.3: Talk
Wednesday, March 13, 2024, 15:00–15:15, HS 1098
Resistive cooling of ions’ center-of-momentum energy in a Penning trap on milli-second time scales — •Markus Kiffer1, Stefan Ringleb1, Manuel Vogel3, and Thomas Stöhlker1,2,3 — 1Friedrich Schiller-Universität Jena, 07743 Jena, Germany — 2Helmholtz-Institut Jena, 07743 Jena, Germany — 3GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
Resistive cooling is a well-established technique to cool the axial motion of ions in a Penning trap. It is especially efficient for large ensembles as the cooling rate scales linearly with the number of ions. Such a fast rate is necessary to quickly create a dense ion cloud for laser experiments at the HILITE experiment. However, this fast rate is only expected for the collective motion of the ion cloud, which decays quickly due to trap anharmonicities.
In our setup the ion bunches are produced by a dedicated ion source and trapped directly in a harmonic potential. This means the ions have a significant collective motion and are immediately in resonance with the cooling circuit, which allows the prompt measurement after trapping. We present measured cooling curves of the collective cloud motion for a controlled ion number and verify that the measured rate is proportional to the number of trapped ions. Using an effective energy model we model the measured curve and extract both the resistive cooling rate and the dephasing rate. Currently, we trap several thousand Ne8+ ions, which results in a collective cooling time on the order of 10 ms.
Keywords: Penning trap; resistive cooling; trapped charged particles