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First observation of evaporative cooling of highly charged ions in a Penning trap resolved by their coherent axial oscillations
Stockholm University, Faculty of Science, Department of Physics. (Atomfysik)
Stockholm University, Faculty of Science, Department of Physics. (Atomfysik)
Lanzhou University, School of Nuclear Science and Technology.
Stockholm University, Faculty of Science, Department of Physics. (Atomfysik)
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

We have trapped and stored Ar16+ ions in a cylindrical Penning trap and managed to evaporatively cool the ion clouds axial motion to thermal temperature. The stored ion cloud is excited axially by fast switching of the trap potentials whereafter the cloud starts to oscillate coherently. The cooling is observed from the time of flight resolved peaks originating from the oscillations while lowering the trap potential slowly. The peaks widths decrease with increased storage time.

Keyword [en]
Penning Traps, TOF spectroscopy
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-29383OAI: oai:DiVA.org:su-29383DiVA: diva2:232855
Available from: 2009-08-26 Created: 2009-08-26 Last updated: 2010-01-14Bibliographically approved
In thesis
1. SMILETRAP I / II: Precision Improvements in Penning-Trap Mass-Spectrometry
Open this publication in new window or tab >>SMILETRAP I / II: Precision Improvements in Penning-Trap Mass-Spectrometry
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis describes the final precision mass measurements with SMILETRAP I, where a relative precision of < 1 ppb (10-9) was reached routinely, and the development of SMILETRAP II, aiming for measurements with < 0.1 ppb relative precision. The emphasis of the thesis is on the implementation of new techniques for achieving this precision improvement with SMILETRAP II. The Ramsey multiple-pulse excitation technique was tested at SMILETRAP I, and a reduction of the statistical uncertainty by factor three could by verified. The technique was applied in the last measurement with SMILETRAP I on H2+ and D+ ions. From these measurements the proton mass was deduced with a relative error of 0.18 ppb. It was found that temperature dependent magnetic field oscillations limited us from reducing the uncertainties further. A technical achievement of reducing the peak to peak temperature oscillation in the trapping region of SMILETRAP II by a factor four is presented, which should give an extended observation time and likewise improved precision. The new SMILETRAP II super-conducting magnet, with a slightly stronger field of 5.8 T compared with the previous of 4.7 T, was installed and adjusted.  A careful field alignment and reduction of inhomogeneities was done for minimizing the disturbances of the cyclotron frequency for improved precision. In that attempt, the localization and control of the trapped ion motion is also important. Thus a new cooling trap was set up. In the spring of 2009 coherent axial motion of a confined ion cloud was discovered in the cooling trap. By observation of the axial oscillations we can see the effects of evaporative cooling in the reduction of the axial energy distribution. Storing the ions up to 1 s in the cooling trap reduces the energy distribution by a factor of five. Other remarkable results of the ion oscillations are also reported.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2009. 78 p.
Keyword
Penning trap, Mass spectrometers, Instrumentation and methods for time-of-flight (TOF) spectroscopy, Highly charged ions
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-29399 (URN)978-91-7155-931-9 (ISBN)
Public defence
2009-09-25, sal FA31, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: In progress. Paper 3: Submitted.Available from: 2009-09-03 Created: 2009-08-26 Last updated: 2010-01-13Bibliographically approved

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Suhonen, MarkusHobein, MatthiasSolders, AndreasSchuch, Reinhold
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