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Preparation and cooling of magnesium ion crystals for sympathetic cooling of highly charged ions in a Penning trap

Murböck, Tobias (2017):
Preparation and cooling of magnesium ion crystals for sympathetic cooling of highly charged ions in a Penning trap.
Darmstadt, Technische Universität Darmstadt, [Online-Edition: http://tuprints.ulb.tu-darmstadt.de/6037],
[Ph.D. Thesis]

Abstract

In this work, laser-cooled ion crystals containing 1000 to 100000 singly charged magnesium ions (Mg+) were prepared in a Penning trap. The properties of the ion crystals and their structure displaying long-range ordering were analyzed by various non-destructive techniques. After creation of the Mg + ions in the form of ion bunches in an external source, the ions were injected into the Penning trap where their temperature was reduced by eight orders of magnitude within seconds using a combination of buffer gas cooling and Doppler laser cooling. The achieved temperatures in the millikelvin-regime were close to the theoretical Doppler-cooling limit and sufficiently low to induce the transition to a crystal phase exhibiting long-range ordering. The structure of these mesoscopic ion crystals is in agreement with a model describing the crystal as a set of planar shells. This allows for a derivation of properties such as the charge density or the temperature of the observed crystals. For the process of combined buffer-gas and Doppler laser cooling an analytical model has been developed, which explains the time development of the temperature and the fluorescence signal in agreement with the experimental results.

Item Type: Ph.D. Thesis
Erschienen: 2017
Creators: Murböck, Tobias
Title: Preparation and cooling of magnesium ion crystals for sympathetic cooling of highly charged ions in a Penning trap
Language: English
Abstract:

In this work, laser-cooled ion crystals containing 1000 to 100000 singly charged magnesium ions (Mg+) were prepared in a Penning trap. The properties of the ion crystals and their structure displaying long-range ordering were analyzed by various non-destructive techniques. After creation of the Mg + ions in the form of ion bunches in an external source, the ions were injected into the Penning trap where their temperature was reduced by eight orders of magnitude within seconds using a combination of buffer gas cooling and Doppler laser cooling. The achieved temperatures in the millikelvin-regime were close to the theoretical Doppler-cooling limit and sufficiently low to induce the transition to a crystal phase exhibiting long-range ordering. The structure of these mesoscopic ion crystals is in agreement with a model describing the crystal as a set of planar shells. This allows for a derivation of properties such as the charge density or the temperature of the observed crystals. For the process of combined buffer-gas and Doppler laser cooling an analytical model has been developed, which explains the time development of the temperature and the fluorescence signal in agreement with the experimental results.

Place of Publication: Darmstadt
Divisions: 05 Department of Physics > Institute of Applied Physics > Atoms Photons Quanta
05 Department of Physics > Institute of Applied Physics
05 Department of Physics
Date Deposited: 19 Mar 2017 20:55
Official URL: http://tuprints.ulb.tu-darmstadt.de/6037
URN: urn:nbn:de:tuda-tuprints-60370
Referees: Birkl, Prof. Dr. Gerhard and Nörtershäuser, Prof. Dr. Wilfried
Refereed / Verteidigung / mdl. Prüfung: 12 December 2016
Alternative Abstract:
Alternative abstract Language
Im Rahmen dieser Arbeit wurden in einer Penningfalle lasergekühlte Ionenkristalle mit Teilchenzahlen zwischen 1000 und 100000 Magnesiumionen (Mg+) erzeugt und die sich dabei ausbildenden Strukturen untersucht. Die Erzeugung der Ionenkristalle erfolgte dabei durch eine Kombination aus Puffergaskühlen und Laser-Dopplerkühlen, wodurch die Temperatur der Magnesiumionen innerhalb von wenigen Sekunden um acht Größenordnungen reduziert werden konnte. Die erreichte Temperatur der Mg+-Ionen war mit einigen Millikelvin hinreichend gering zur Ausbildung einer Kristall-Phase. Die Struktur der Ionenkristalle aus mehreren, zueinander parallelen Kristallschalen konnte in Übereinstimmung mit einem theoretischen Modell beschrieben werden. Aus der Modellierung der Ionenkristalle ließen sich weitere Kristalleigenchaften wie die Temperatur oder Ladungsdichte ableiten. Der Prozess des kombinierten Kühlens wurde im Rahmen eines theoretischen Modells analytisch beschrieben und wesentliche Eigenschaften des Kühlverlaufs konnten in Übereinstimmung mit den experimentellen Befunden vorhergesagt werden.German
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