eprintid: 33185
rev_number: 15
eprint_status: archive
userid: 7331
dir: disk0/00/03/31/85
datestamp: 2023-04-27 08:56:33
lastmod: 2023-07-17 10:57:38
status_changed: 2023-07-17 10:57:38
type: doctoralThesis
metadata_visibility: show
creators_name: Will, Christian
title: Sympathetic Cooling of Trapped Ions Coupled via Image Currents: Simulation and Measurement
divisions: i-130001
divisions: i-851340
adv_faculty: af-13
keywords: Penning trap, Ion trap, laser cooling, sympathetic cooling, precision measurements, antiproton, antimatter
cterms_swd: Ionenfalle
cterms_swd: Laserkühlung
cterms_swd: Präzisionsmessung
abstract: The ability to transfer the temperature of laser cooled ions to species without a suitable optical cooling transition is of vital interest for the next generation of experiments with trapped ions. For example, our experiment (BASE-Mainz) performs high-precision Penning-trap measurements of the proton magnetic moment. The currently most precise measurement is limited by the non-zero particle temperature of about 1 K. Recently, we have demonstrated the first sympathetic cooling of a single proton with laser cooled
beryllium ions. Here, both species are located in macroscopically separated traps and the coupling is mediated by image currents, which are enhanced via a superconducting RLC circuit. Due to the spatial separation between the target ion and the laser-coolable species, this cooling method can be applied not only to a single proton, but to any charged particle, including exotic particles such as antiprotons or highly-charged ions.
In the course of this thesis, a particle temperature of (160 ± 30) mK was reproducibly achieved for such a sympathetically cooled proton. This constitutes an improvement by a factor of 16 compared to the previous record of (2.6 ± 2.5) K and is a factor of 55 below the
environment temperature. This accomplishment was enabled by two major advancements: First, numerical simulations of the coupled Penning-trap system were developed and carried
out, which significantly progressed the understanding of the coupling and cooling mechanism. Second, a new experimental apparatus was commissioned, which comprises among
other upgrades a dedicated temperature measurement trap. In addition, the simulations were employed to establish future cooling schemes that reach temperatures of 10 mK and
possibly below.
date: 2023
id_scheme: DOI
id_number: 10.11588/heidok.00033185
ppn_swb: 1843705982
own_urn: urn:nbn:de:bsz:16-heidok-331853
date_accepted: 2023-07-06
advisor: HASH(0x55fc36c18ae8)
language: eng
bibsort: WILLCHRISTSYMPATHETI20230420
full_text_status: public
place_of_pub: Heidelberg
citation:   Will, Christian  (2023) Sympathetic Cooling of Trapped Ions Coupled via Image Currents: Simulation and Measurement.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/33185/1/thesis_gedruckt.pdf