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Re-trapping and cooling of highly-charged
Stockholm University, Faculty of Science, Department of Physics. (Atomfysik)
Stockholm University, Faculty of Science, Department of Physics. (Atomfysik)
Stockholm University, Faculty of Science, Department of Physics.
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2009 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 163, 012109- p.Article in journal (Refereed) Published
Abstract [en]

Presently, a trapping system for cooling highly-charged ions (HCI) is being set up at AlbaNova at Stockholm University. The experiment aims at production of low temperature (emittance) HCI at very low energy. HCI are extracted from the new Stockholm EBIT (S-EBIT) before evaporative cooling is applied in a Penning trap. In the future the cooled ions will be injected into the precision trap of the high-precision mass spectrometer SMILETRAP II. In first tests the emittance of trapped ions was measured and it was shown that highly and low-charged ions could be simultaneously stored

Place, publisher, year, edition, pages
2009. Vol. 163, 012109- p.
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-56737DOI: 10.1088/1742-6596/163/1/012109OAI: diva2:412833
Available from: 2011-04-27 Created: 2011-04-26 Last updated: 2011-04-27Bibliographically approved
In thesis
1. Precision mass measurements: Final limit of SMILETRAP I and the developments of SMILETRAP II
Open this publication in new window or tab >>Precision mass measurements: Final limit of SMILETRAP I and the developments of SMILETRAP II
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The subject of this thesis is high-precision mass-measurements performed with Penning trap mass spectrometers (PTMS). In particular it describes the SMILETRAP I PTMS and the final results obtained with it, the masses of 40Ca and that of the proton. The mass of 40Ca is an indispensible input in the evaluation of measurements of the bound electron g-factor, used to test quantum electrodynamical calculations in strong fields. The value obtained agrees with available literature values but has a ten times higher precision.

The measurement of the proton mass, considered a fundamental physical constant, was performed with the aim of validating other Penning trap results and to test the limit of SMILETRAP I. It was also anticipated that a measurement at a relative precision close to 10-10 would give insight in how to treat certain systematic uncertainties. The result is a value of the proton mass in agreement with earlier measurements and with an unprecedented precision of 1.8×10-10.

Vital for the achieved precision of the proton mass measurement was the use of the Ramsey excitation technique. This technique, how it was implemented at SMILETRAP I and the benefits from it is discussed in the thesis and in one of the included papers.

The second part of the thesis describes the improved SMILETRAP II setup at the S-EBIT laboratory, AlbaNova. All major changes and upgrades compared to SMILETRAP I are discussed. This includes, apart from the Ramsey excitation technique, higher ionic charge states, improved temperature stabilization, longer run times, different reference ions, stronger and more stable magnetic field and a more efficient ion detection. Altogether these changes should reduce the uncertainty in future mass determinations by an order of magnitude, possibly down to 10-11.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2011. 64 p.
SMILETRAP, Precision mass spectrometry, Penning trap, Atomic mass, Highly charged ions, Low energy ion storage, Time of flight ion cyclotron resonance, High frequency, Proton mass, QED, g-factor
National Category
Physical Sciences
Research subject
urn:nbn:se:su:diva-56777 (URN)978-91-7447-303-2 (ISBN)
Public defence
2011-05-26, sal FB53, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (English)
At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 9: Accepted.Available from: 2011-05-04 Created: 2011-04-27 Last updated: 2011-05-13Bibliographically approved

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Hobein, MatthiasSolders, AndreasSchuch, Reinhold
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